- Sep 11 —SAFETY OVERVIEW
The RL is equipped with a comprehensive array of the latest technologies to enhance active safety (accident avoidance) and passive safety (crash safety performance). Features like Vehicle Stability Assist™ (VSA®) with traction control, heightened handling agility, SH-AWD™ and ABS enhance accident avoidance capability in the RL. Should a collision prove unavoidable, the Advanced Compatibility Engineering™ (ACE™) body structure of the RL is designed to provide a protective cocoon for passengers in the event of a collision with a different sized vehicle (a truck or SUV, for example). Inside the RL, side, side curtain and dual-stage front air bag systems work together with sophisticated restraint systems to minimize injury to passengers in sufficient impacts.
As part of its commitment to providing Safety Through Innovation, Acura debuts two optional Technology Packages on the RL:

• RL with Technology Package includes: Acura Satellite Navigation System and AcuraLink™ with real-time traffic and rearview camera, Active Front Lighting System (AFS) and an upgraded wood interior
• RL with Technology Package plus CMBS™ and PAX® Tires include: Acura's Collision Mitigation Braking System™ (CMBS™) and Michelin® PAX® run-flat tires
  • Collision Mitigation Braking System™ (CMBS™), which monitors the following distance and closing rate between the RL and the car directly in front of it, warns the driver when a collision is likely and helps reduce impact when a collision becomes unavoidable
  • Michelin® PAX® run-flat tires provide enhanced mobility and security with continuous drivability of up to 125 miles at 50 mph following a tire puncture

From a safety standpoint, these new Technology Package features help make the 2008 RL one of the most comprehensively equipped vehicles in North America.
The following are key standard passive safety features on the RL:
Passenger Seating

• Passenger seatbelt reminder
• 3-point adjustable height front seat belts with load limiters and pretensioners
• Front seat belt load limiters
• Front 4-way adjustable head restraints
• Driver's seat position sensor
• Driver's and front passenger's side airbags with front passenger Occupant Position Detection System (OPDS)
• Rear center three-point seat belt

Child Seating

• Automatic Locking Retractors/Emergency Locking Retractors (ALR/ELR)
• Tether anchors (all rear positions)
• LATCH (Lower Anchors and Tethers for CHildren) child-seat mounting system for rear outboard seats

Airbags

• Driver and front passenger dual-stage, dual-threshold airbag Supplemental Restraint System (SRS)
• Seamless dashboard-mounted airbag lid for the passenger airbag
• Driver and front passenger side airbags with front passenger Occupant Position Detection System (OPDS)
• Side curtain airbag system

OPTIONAL TECHNOLOGY PACKAGES
For 2008, two tiers of Technology Packages are available for the RL:

• RL with Technology Package includes: Acura Satellite Navigation System and AcuraLink™ with real-time traffic and rearview camera, Active Front Lighting System (AFS) and an upgraded wood interior
• RL with Technology Package plus CMBS™ and PAX® Tires includes: Acura's Collision Mitigation Braking System™ (CMBS™) and Michelin® PAX® run-flat tires
  • Collision Mitigation Braking System™ (CMBS™), which warns the driver of impending rear-end collisions and helps reduce impact when collisions are unavoidable
  • PAX® run-flat tires that provide enhanced safety and security with continuous mobility of up to 125 miles at 50 mph following a tire puncture

COLLISION MITIGATION BRAKING SYSTEM™ (CMBS™)
In 2006, the RL was the first Acura vehicle to offer an optional Collision Mitigation Braking System™ (CMBS™). This revolutionary safety technology monitors potential rear-end collisions, uses audio, visual and tactile signals to alert drivers to the risk of collision, assists brake operation and tensions the front seatbelts to help reduce impact on occupants and vehicle damage should a collision become unavoidable. Unlike pre-collision systems on competitive vehicles, CMBS™ automatically applies the brakes to mitigate the severity of a collision.
Using a millimeter-wave radar unit located inside the front grille, the CMBS™ system monitors the distance between the RL and the car directly in front of it up to a distance of 300 feet along with the rate of closure between the two vehicles. When the closing rate increases to a point where a collision is likely to occur (based on relative vehicle speeds and following distance) the system uses visual and audible warnings to prompt the driver to take preventative action. If, based on the driver's response, the system determines that the likelihood of a collision has decreased to an acceptable level, the CMBS™ system will disengage. If, however, the driver's response does not sufficiently reduce the risk of a collision, the system will issue a secondary warning consisting of audible, visual and tactile elements as well as light braking to alert the driver to take action. If the closing rate increases so much that a collision becomes unavoidable, CMBS™ can initiate hard braking to reduce the vehicle's speed as well as tension the driver and front passenger seatbelts to help reduce the severity of the crash.
Collision Mitigation Braking System ™ (CMBS ™) Overview

1. Stage one: When there is a risk of a collision with the vehicle ahead or if the distance between the vehicles has dropped below the pre-set level, a buzzer sounds and the message "BRAKE" appears on the Multi-Information Display.
2. Stage two: If the distance between the two vehicles continues to diminish, CMBS™ applies light braking, and an electric motor activates the driver's seat belt E-pretensioner, retracting the seatbelt gently two or three times, providing the driver with a tactile warning. The buzzer sounds again and the word "BRAKE" appears again on the Multi-Information Display.
3. Stage three: If, after issuing the primary and secondary warnings, the CMBS™ system determines that a collision is unavoidable, the E-pretensioner retracts the driver and front passenger seatbelts with enough force to compensate for seatbelt slack or baggy clothing and activates the brakes forcefully to reduce the speed of impact in the attempt to mitigate the collision effects on the RL and its occupants.

The CMBS™ system functions only when the RL is traveling at over 10 miles per hour and when the speed differential between the RL and the car directly in front it is 10 mile per hour or more. CMBS™ can be turned off by depressing a switch located on the left hand side of the instrument panel.

MICHELIN® PAX® TIRE SYSTEM
The 2008 RL offers Michelin's innovative PAX® System, an extended mobility tire-and-wheel system that allows drivers to continue driving in the event of a loss of air pressure. The Michelin® PAX® System (included with the RL with Technology Package plus CMBS™ and PAX® Tires) gives drivers the security to travel on a deflated tire for up to 125 miles at 50 mph. The PAX® System uses a unique wheel size and 245-680R 460A 102V Michelin PAX® run-flat high performance all-season tires. The PAX® Extended Mobility System is comprised of four components:

• A tire design that dynamically locks onto the wheel and will not come unseated during normal use, with a performance-enhancing structure and short sidewalls
• An inner support ring that carries the load of the vehicle if pressure is lost
• A specially shaped wheel to facilitate the inner support ring
• A tire pressure monitoring system with position indicator that warns the driver of pressure loss

The system offers owners the convenience and security of knowing that they will not be stranded with a flat tire while offering numerous benefits over conventional run-flat tires and radial tires. Unlike conventional run flat tires, the PAX® system uses an inner support ring instead of a heavy and stiff reinforced sidewall thus allowing for improved overall ride quality as well as increased stability in run-flat situations.
Additionally, PAX® tires offer benefits over traditional radial tires including:

• As much as a 12-percent lower rolling resistance, benefiting fuel economy
• Sporty appearance and sporty handling capabilities with low-profile sidewall and increased wheel diameter
• In the event of a flat tire, drivers no longer run the risk of having to stop in dangerous or uncomfortable situations (night, rain, highways, etc.)
• In the event of tire pressure loss, the exclusive tire bead anchoring system securely locks the tire bead to the wheel
• No need for a spare tire

The PAX® system uses a Tire Pressure Monitoring System™ (TPMS™) that displays on the RL's Multi-Information Display (MID) screen the pressure status for each individual tire. In the event of a tire puncture, the MID alerts the driver with a visual and audible warning. In addition to electronic warnings, a deflated PAX® tire makes a slight rumble noise and the ride quality of the vehicle changes. PAX® tires are normally reparable after a puncture and after having been run in the deflated condition. A special bead system creates a physical interlock between the uniquely shaped wheel rim and the bead of the tire. Instead of air pressure alone creating a tight lock between tire and wheel, the tension in a PAX® tire pulls on a bead wire, tightening it into the wheel and preventing the tire from coming off the rim.
Detailed information regarding the PAX® system is available at www.michelinman.com. A 24-hour/365 day per year toll-free number has been established (located on a document included with the Owner's Manual) to assist customers with PAX® repair needs.
TIRE PRESSURE MONITORING SYSTEM™ (TPMS™)
The onboard Tire Pressure Monitoring System™ (TPMS™) with location and pressure indicators warns the driver when the air pressure lowers in any tire. This helps reduce the chance of losing control of the vehicle due to low tire pressure. This is important because a slow leak (such as might be caused by a nail embedded through the tread) might not be detectable immediately but over time could cause significant air loss, reduced tire grip and potentially a blowout.
A sensor mounted on each wheel continually monitors tire pressure and sends a coded signal to an initiator located inboard of the tire on the chassis. The information is then sent to an electronic control unit that compares the values of each tire against an acceptable set of values.
When a tire's pressure drops significantly below the proper specification, a "CHECK TIRE PRESSURE" alert appears on the MID alert screen. The system can simultaneously display the air pressure in all four tires via the MID, making it simple to locate the specific low tire. If there is a fault in the system, a "CHECK TPMS SYSTEM" alert appears. At the driver's preference the display can continually show the air pressure in all four tires. Regardless of whether the driver chooses to monitor the pressures, a warning will still occur if a tire drops below specification.
ADVANCED COMPATIBILITY ENGINEERING™ (ACE™) BODY STRUCTURE
The Advanced Compatibility Engineering™ (ACE™) body structure on the 2008 Acura RL is designed to take vehicle front frame construction beyond conventional safety protocols such as the NHTSA NCAP 35 mph frontal barrier test or the IIHS 40 mph offset frontal crash. Its goal is to deliver significantly enhanced occupant protection in a variety of real-world crash conditions. These incidents may include a frontal collision between vehicles of differing heights, weights and frame construction.
The structure uses the engine compartment to efficiently absorb and disperse collision energy during a vehicle-to-vehicle collision. It features a new frame structure composed of a highly efficient energy-absorbing main frame, a bulkhead (upper frame) which absorbs the upper part of the collision energy, and a lower member that helps prevent misalignment of the frames of the vehicles involved. This design disperses collision forces over a larger frontal area, which enhances energy absorption of the engine compartment, reduces the chance of deformation of the passenger compartment and results in enhanced occupant protection. At the same time, ACE™ reduces the chance of vertical or lateral misalignment between the RL and other vehicle's safety structures.
During a frontal collision, a conventional body structure generally concentrates the loads from the impact through two pathways running longitudinally through the lower portion of the frame. The ACE™ structure's front-mounted polygonal main frame is designed to prevent cabin deformation by distributing forces through multiple major load bearing pathways—and away from the passenger compartment.
CRASH TESTING
The RL has received the highest ratings given (5 Stars) by NHTSA in frontal and side impact testing as well as rollover resistance. In addition, the RL rated GOOD in impact test conducted by the Insurance Institute for Highway Safety (IIHS).

• In the 35 mph NHTSA New Car Assessment Program (NCAP) full frontal barrier test, the RL earned Five Stars, the highest rating for both driver and front passenger
• In the 38.5 mph SINCAP side test, the RL earned Five Stars, the highest rating for both front and rear outboard passenger
• In the IIHS 40 mph frontal offset test, the RL earned a GOOD rating
• In the IIHS 31 mph (50 km/h) Side Impact Collision Evaluation (SICE) test, the RL earned a GOOD rating

DRIVER AND FRONT PASSENGER DUAL-STAGE, DUAL-THRESHOLD AIRBAG SUPPLEMENTARY RESTRAINT SYSTEM (SRS)
Dual-stage airbags for the driver and front passenger are designed to provide protection for the head and chest during a moderate to severe front collision, while simultaneously helping to reduce injuries. They do both through the use of a dual-stage, dual-threshold airbag technology. Each airbag inflator has two stages. During a severe collision both stages fire simultaneously to provide immediate airbag inflation. Yet, during a moderate collision the igniters fire in sequence, slowing the deployment rate of the airbags.
Besides the severity of the collision, the modules interpret a signal from the seat belt buckle switch that indicates whether the occupants are wearing seat belts.

• If the front passengers are not wearing seat belts, the inflators will activate simultaneously to make the airbag deploy more quickly.
• If front passengers are wearing seat belts, the airbags will inflate at a slightly higher threshold.

In the RL, the system also assesses the weight of the front passenger through a seat-mounted weight sensor. If the detected weight is less than a certain amount, the front passenger airbag is turned off. The front passenger airbag also features a seamless instrument panel cover over the airbag for a cleaner, more elegant look.
DRIVER'S AND FRONT PASSENGER'S SIDE AIRBAGS WITH FRONT PASSENGER OCCUPANT POSITION DETECTION SYSTEM (OPDS)
New larger size side airbags are mounted in the outboard area of each front seatback. The airbags are designed to provide upper torso protection in the event of a sufficient side impact. The front passenger seat is equipped with Occupant Position Detection System (OPDS), an innovative system designed to deactivate the side air bag if a small child (or small-stature adult) leans into the side air bag deployment path. When the passenger returns to an upright seating position, the side air bag reactivates so it can deploy and help protect the occupant in a side impact. The system utilizes sensors in the passenger seatback to determine the height and position of the occupant, and to determine if it is safe to deploy the side air bag.
SIDE CURTAIN AIRBAGS
In a sufficient side impact, the RL's side curtain airbags deploy from roof modules, providing head protection for front-seat as well as outboard rear-seat occupants. Side curtain airbags effectively cover the window area from the A-pillar back to the C-pillar. Tests show that the g forces acting upon an occupant's head are far lower with a side curtain airbag.
LATCH (LOWER ANCHORS AND TETHERS FOR CHILDREN)
The RL includes a LATCH (Lower Anchors and Tethers for CHildren) child-seat mounting system for the outboard rear seats. LATCH features built-in lower anchors and ready-to-use tether attachment points that allow compatible child safety seats to be installed without using the vehicle's seat belt system. The LATCH system simplifies child seat installation when an owner installs a LATCH-compatible child seat. The center rear seat has a tether point, but no lower anchors.
PEDESTRIAN SAFETY
Acura's safety interests extend beyond care for vehicle occupants. The RL hood area is designed to deform if contact is made with a pedestrian. Underneath the hood are energy-absorbing supports and fender mounts, and the windshield wiper pivots are also deformable in the event that a pedestrian contacts these areas. Research shows that features such as these dramatically improve a pedestrian's chance of survival if struck by a moving vehicle.


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Torrance, Calif. - Sep 11 — POWERTRAIN Engine Type 3.5-liter, SOHC, 60-degree VTEC® V-6 Horsepower 290 hp@ 6200 rpm Torque 256 lb-ft @ 5000 rpm Redline 6800 rpm Bore and Stroke 3.50 in x 3.66 in (89 mm x 93 mm) Displacement 212 cu in (3471 cc) Compression Ratio 11.0:1 Induction System Programmed Fuel Injection (PGM-FI) Valvetrain Variable valve Timing and Lift electronic Control (VTEC™) with 4-valves-per-cylinder, belt-driven, single overhead camshaft Engine Block Aluminum alloy with centrifugally cast iron cylinder liners Cylinder Head Aluminum alloy with 4-valves-per-cylinder with pent-roof combustion chambers Emission Control Close-coupled catalytic converter
CARB-certified ULEV-2 emission control Ignition System Direct ignition system with knock control Alternator 130 amp max Battery 12V, maintenance free Recommended Fuel Premium Unleaded Layout Transversely mounted, front engine, Super Handling All-Wheel Drive™ (SH-AWD™) Transmission Sequential SportShift 5-speed automatic with paddle-shifters and Grade Logic Control
Ratios (:1) 1st
2nd
3rd
4th
5 th
Reverse
Final (secondary)
Final Drive 2.697
1.573
1.071
0.694
0.481
1.889
1.238
4.600 CHASSIS Body Type Steel and aluminum unit body Front Suspension Independent double-wishbone with coil springs and stabilizer bar Rear Suspension Independent multi-link with coil springs and stabilizer bar Shock Absorbers Nitrogen-filled, telescopic, gas-pressurized with Progressive Valve technology, front and rear Stabilizer Bars Front 1.14 in. (29 mm) diameter Rear 0.67 in.(17 mm) diameter Shock tower bar 1.26 in x 0.87 in (32 mm x 22mm) diameter 0.09 inch (2.3 mm) wall thickness Steering Type Electronically controlled, speed-sensing, variable power-assisted, rack-and-pinion Steering Ratio 16.2:1 Steering Wheel Turns (lock to lock) 2.98 Turning Circle (curb to curb) 39.7 ft (12.1 m) Wheels Optional RL with Technology Package plus CMBS and PAX Tires: 17.0 x 8.0-inch aluminum alloy 18.0 x 8.0-inch aluminum alloy Tires Optional RL with Technology Package plus CMBS™ and PAX®: P245/50R17 98V Michelin® high performance all-season P245/680R 460A 102V Michelin® PAX® run-flat high performance all-season Braking System Power-assisted, 4-wheel disc brakes with ABS Front Discs Ventilated 12.6-in (320 mm) diameter Rear Discs Ventilated 12.2-in (310 mm) diameter Anti-Lock Braking System (ABS) 3-channel system with 4-wheel speed sensors and electric/hydraulic control Vehicle Stability Assist™ (VSA®) system Throttle control and 4-channel brake control utilizing yaw, lateral g, speed and steering sensors CAPACITIES Crankcase 5.3 US qt (5.0 L) Total Cooling System 9.1 US qt (8.6 L) Total Fuel tank 19.4 US gallons (73.3 L) Volumes Passenger 99.1 cu ft: 55.3 front, 43.8 rear Cargo 13.1 cu ft
Total 112.2 cu ft FUEL ECONOMY City/Highway/Combined 16/24/19* EXTERIOR DIMENSIONS Wheelbase 110.2 in (2800 mm) Track, front 62.0 in (1576 mm) Track, rear 62.4 in (1585mm) Overall Length 193.6 in (4917 mm) Overall Width 72.7 in (1847mm) Overall Height (unladen) 57.1 in (1452 mm) Minimum Ground Clearance
(non-load) 5.7 in (145 mm) WEIGHTS Curb Weight (Base)
Technology package CMBS + PAX® 4014 lbs (1820 kg)
4076 lbs (1828 kg) Weight Distribution (% front / rear) 58/42 INTERIOR DIMENSIONS Front Head Room 38.5 in (977 mm) Leg Room 42.4 in (1076 mm) Hip Room 55.1 in (1400 mm) Shoulder Room 58.5 in (1487 mm) Rear Head Room 37.2 in (946 mm) Leg Room 36.3 in 923mm) Hip Room 54.0 in (1372mm) Shoulder Room 56.1in (1426 mm) WARRANTY Vehicle 4-year / 50,000-mile limited warranty Powertrain 6-year / 70,000-mile limited warranty Outer Body Rust-Through 5-year / unlimited-mile limited warranty Acura Total Luxury Care (TLC) with
roadside assistance 4-year / 50,000-mile

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Torrance, Calif. - Sep 11 —POWERTRAIN OVERVIEW
The RL powertrain features a 3.5-liter SOHC V-6 engine, VTEC® valvetrain operation, a Sequential SportShift 5-speed automatic transmission with steering wheel mounted paddle shifters and Grade Logic Control, and Super Handling All-Wheel Drive™. The crankshaft of the RL is positioned transversely (side to side) rather than longitudinally (front to rear), which allows the RL engine to be packaged more tightly for better handling agility, without sacrificing interior comfort.
The advanced VTEC® engine develops 290 horsepower and 256 lb-ft of torque. Fuel economy is EPA rated at 16/24 mpg* (city/highway) and it meets CARB LEV-2 ULEV requirements.
While not as powerful as some V-8 engines, the RL's high output V-6 is lightweight for better acceleration and more nimble handling. To more effectively put power to the ground, the RL comes standard with a Sequential SportShift 5-speed automatic with steering wheel mounted paddle shifters that allow easy finger-tip-activated manual operation.
To maximize available traction and to provide exceptional handling balance, the RL comes standard with Super Handling All-Wheel Drive™ (SH-AWD™), the first and only all-wheel drive system that distributes the optimum amount of torque not only between the front and rear wheels but also between the left and right rear wheels. The system's direct yaw control makes the cornering character of the RL exceptionally neutral when under power.
POWERTRAIN AT A GLANCE
Engine

• 3.5-liter, SOHC, VTEC® V-6 engine produces 290 horsepower at 6200 rpm and 256 lb-ft of torque at 5,000 rpm
• VTEC® (Variable Valve Timing and Lift Electronic Control)
• 11.0:1 Compression ratio
• Two-piece, dual-stage intake manifold
• Direct ignition system with detonation/knock control
• Variable flow exhaust system
• Drive-by-wire throttle system
• Computer-controlled Programmed Fuel Injection (PGM-FI)
• Maintenance Minder System optimizes service intervals
• 100,000 miles or more tune-up interval

Emissions/Fuel Economy

• High-flow, close-coupled catalytic converters plus under floor catalytic converter
• High capacity 32-bit RISC processor emissions control unit
• Meets CARB LEV-2 ULEV standard
• EPA estimated 16/24 mpg (city/highway)

Noise, Vibration & Harshness (NVH)

• 60-degree engine cylinder V-angle for inherently smooth operation
• Automatically tensioned, maintenance-free serpentine accessory drive

5-speed automatic with Sequential SportShift, paddle shifters and Grade Logic Control

• Quick-response Sequential SportShift allows semi-manual operation
• Steering-wheel mounted manual-mode F1®-style paddle shifters
• Coordination between drive-by-wire throttle system and transmission makes for quicker, smoother shifts
• Wide gear ratio spacing for strong acceleration and good fuel economy
• Advanced shift-hold control limits upshifts during spirited driving
• Advanced Grade Logic Control System reduces gear "hunting" on steep hills

Super Handling All-Wheel Drive™ (SH-AWD™)

• Fully automatic, full-time traction and handling enhancing system
• Distributes torque between the front and rear wheels and between the left and right rear wheels to directly control the yaw moment of the vehicle
• Understeer is reduced when cornering
• Outer wheel capable of being overdriven by up to five percent during cornering

ENGINE ARCHITECTURE
The 3.5-liter SOHC VTEC® V-6 in the RL is the most powerful sedan engine in Acura's history and incorporates many of the refinements and improvements that have been developed in other Acura powerplants. The RL engine has a smooth-firing 60-degree V-angle and compact overall dimensions. Aluminum alloy construction saves weight and improves cooling, while free-breathing VTEC® cylinder heads operate four valves per cylinder.
A high inertia intake system, increased compression ratio, close-coupled catalytic converters and high flow exhaust help make the RL engine the most powerful normally aspirated 6-cylinder engine in its class.
ENGINE BLOCK
The lightweight, heat-treated die-cast aluminum-alloy cylinder block has cast-in-place iron cylinder liners. These thin-wall, centrifugal-cast iron liners help reduce the block's overall length and weight. With their rough outer surfaces, the liners bond securely to the surrounding aluminum during the manufacturing process, enhancing liner-to-block rigidity and heat transfer. The cylinder block also incorporates a deep-skirt design for rigid crankshaft support and minimized noise and vibration.
CRANKSHAFT/ PISTONS/CONNECTING RODS
The RL V-6 uses a forged-steel crankshaft with revised counterweights to accommodate the weight of higher compression pistons. With taller, reinforced crowns, these new pistons provide a compression ratio of 11.0:1. Part of the reason the elevated compression ratio is possible is due to an oil jet system that sprays cooling oil on the underside of the piston crowns to help keep temperatures in check. New steel connecting rods are forged in one piece and then the crankshaft ends are broken, creating a lighter and stronger rod with a perfectly fitted bearing cap.
CYLINDER HEADS / VALVES
Like the TL, the RL uses cast alloy single overhead camshaft (SOHC) cylinder heads that incorporate tuned exhaust manifolds as an integral part of the casting. Made of pressure-cast, low-porosity aluminum, these lightweight cylinder heads improve overall packaging, enhance exhaust flow and allow the optimal positioning of a primary close-coupled catalytic converter on each cylinder bank. To ensure positive sealing, the RL has a three-layer type head gasket like that used on the TL. A single Aramid-fiber reinforced belt drives the overhead camshafts. The RL cylinder heads have 36mm diameter intake valves and 30mm diameter exhaust valves.
VTEC® (VARIABLE TIMING AND LIFT ELECTRONIC CONTROL)
Acura VTEC® (Variable Timing and Lift Electronic Control) is a major contributor to the engine's large gains in horsepower and torque. The system operates the 12 intake valves in two distinct modes, so that the operation of the intake valves continually changes to optimize both volumetric efficiency and combustion of the fuel-air mixture. At low engine speeds, the intake valves have low lift and are open a comparatively short period of time during cylinder filling. At high engine speeds where breathing is critical, the valves switch to high-lift, long duration mode to deliver improved volumetric efficiency. The VTEC® changeover point occurs at 4950 rpm and is undetectable to the driver.
The RL uses a 3-rocker-arm VTEC® system similar to that of the MDX and TL. This configuration allows each of a given cylinder's intake valves to be controlled by its own low-speed cam lobe, allowing for staggered valve opening and lift. (By comparison, with 2-rocker VTEC, a single low-speed cam lobe controls both intake valves for each cylinder). Better air/fuel mixing in the cylinders improves both combustion speed and combustion stability. When the engine reaches 4950 rpm, the powertrain control module (PCM) triggers the opening of an electric spool valve that routes pressurized oil to small pistons within the intake valve rocker arms. The rocker pistons slide into position to lock together the three intake rocker arms in a given cylinder, which then follow a single high-lift, long-duration cam lobe. The intake and exhaust valve timing and duration are unique to the RL.
TWO-PIECE DUAL-STAGE INTAKE MANIFOLD
The RL uses a dual-stage intake manifold that is designed to deliver maximum airflow to the cylinders. The 2-piece cast-aluminum manifold is also has the advantage of being very light, reducing weight by 2.6 pounds over the previous design.
Working in concert with the VTEC® valvetrain, the induction system significantly boosts torque across the engine's operating range. Internal passages and two butterfly valves commanded by the powertrain control module (PCM) provide two distinct modes of operation.
The valves are closed at lower rpm. In this mode, the three cylinders on each bank draw air from only the nearer half of the manifold's internal plenum. The volume of the plenum and the length of inlet passages are tuned to maximize the resonance effect, wherein pressure waves are amplified within each half of the intake manifold during certain rpm ranges. The amplified pressure waves significantly increase cylinder filling and the torque produced by the engine throughout the lower part of its rpm band. Funnel-shaped intake ports—similar to those used on racing engines—are built in at the uppermost end of each intake runner to improve airflow.
As the benefits of the resonance effect lessen with rising engine speed, the butterfly valves open at 4000 rpm to interconnect the two halves of the plenum, thus increasing its volume. An electric motor, commanded by the powertrain control module, controls the connecting butterfly valves. With the valves open, each cylinder draws intake air from the full plenum chamber. The inertia of the mass of air rushing down each intake passage helps draw in more charge than each cylinder would normally ingest. This phenomenon is the same effect produced by a low-pressure supercharger. The inertia effect greatly enhances cylinder filling and the torque produced by the engine at higher rpm.
DIRECT IGNITION AND DETONATION/KNOCK CONTROL
The RL power afforded by the high 11.0:1 compression ratio is made possible by a powertrain control module (PCM) that continually monitors engine functions to determine the best spark timing. An engine block mounted acoustic detonation/knock sensor "listens" to the engine, and based on this input, the PCM retards the ignition timing incrementally to prevent potentially damaging detonation. The RL has iridium alloy-tipped sparkplugs, each with an individual coil unit positioned directly above it.
PROGRAMMED FUEL INJECTION (PGM-FI)
The Programmed Fuel Injection (PGM-FI) system monitors the exact state of the exhaust gas and tracks multiple engine inputs including throttle position, intake air temperature, coolant temperature, intake manifold pressure, and more. Based on these inputs, PGM-FI continuously adjusts and optimizes the amount of fuel delivered to each cylinder.
DRIVE-BY-WIRE THROTTLE
The RL utilizes a drive-by-wire throttle system that eliminates the need for a conventional throttle cable. The system monitors various parameters like throttle pedal position, throttle valve position, road speed, engine speed and gear position, then adjusts the moment-to-moment relationship between pedal position and throttle opening. By altering the amount of "gain" between the pedal and butterfly valve, significant improvements in drivability and acceleration linearity are possible.
For smooth launches from a standing start the system has relatively little gain, so that engine response is smooth and progressive. At higher speeds, the gain increases to provide responsive acceleration for passing and hill climbing. The Sequential SportShift 5-speed automatic transmission and Vehicle Stability Assist™ (VSA®) with traction control are fully integrated with drive-by-wire.
CLOSE-COUPLED CATALYZERS AND VARIABLE FLOW EXHAUST SYSTEM
The exhaust manifolds of the RL are cast directly into the alloy cylinder heads to reduce weight and to position the engine's two primary catalytic converters as close as possible to the combustion chambers. The 600-cell per-square-inch, high-efficiency converters mount directly to the exhaust port of each cylinder head for extremely rapid converter light off moments after the engine starts. By eliminating traditional exhaust header pipes, this arrangement results in a significant weight savings.
A hydroformed 2-into-1 collector pipe carries exhaust gases to a single 350 cell-per-inch secondary catalytic converter located under the passenger cabin. To balance the engine's need for proper exhaust backpressure at low speed and free flow at high speed, the exhaust system incorporates a variable flow rate feature. An exhaust pressure-operated valve in the system has two operating modes. The low speed mode has a flow rate of 130 liters per second; when the engine reaches about 4000 rpm, the exhaust pressure raises enough to open the valve, which increases the flow to 150 liters per second.
EMISSIONS CONTROL
Although the RL's 3.5-liter V-6 has made power advances, it has also become much cleaner. The V-6 now meets tough CARB LEV-2/ULEV emissions standards and is certified to this level of emissions performance for 120,000 miles.
Many advanced technologies contribute to this emissions performance. The cylinder head-mounted close-coupled catalysts light off quickly after engine start up, and a 32-bit RISC microprocessor in the powertrain control module (PCM) boosts computing power to improve the precision of spark and fuel delivery. Particularly right after startup, better fuel atomization is provided by high-efficiency multi-hole fuel injectors that better direct fuel around the intake valve stems.
*California Air Resources Board
NOISE, VIBRATION AND HARSHNESS (NVH) CONTROL
With its 60-degree V-angle and compact, rigid and lightweight die-cast aluminum-alloy block assembly, the new RL powerplant is exceptionally smooth. Other factors that reduce noise and vibration are a rigid forged crankshaft, die-cast accessory mounts, and a stiff, cast aluminum-alloy oil pan.
100,000 MILES OR MORE TUNE-UP INTERVALS
The RL requires no scheduled maintenance for 100,000 miles or more, other than periodic inspections and normal fluid and filter replacements. This first tune-up includes water pump inspection, valve adjustment, replacement of the cam-timing belt and new sparkplugs.
MAINTENANCE MINDER SYSTEM
To eliminate unnecessary service stops while ensuring that the vehicle is properly maintained, the RL has a Maintenance Minder system that automatically monitors the vehicle's operating condition. When maintenance is required, the driver is alerted via a message on the Multi-Information Display (MID).
The system monitors operating conditions such as oil and coolant temperature along with engine speed to determine the proper service intervals. Depending on the operating conditions, oil change intervals can be extended to a maximum of 10,000 miles, potentially sparing the owner considerable money and inconvenience over the life of the car. The owner-resettable system monitors all normal service parts and systems, including
oil and filter, tire rotation, air-cleaner, automatic transmission fluid, spark plugs, timing belt, coolant, brake pads and more. To prevent driver distraction, maintenance alerts are presented when the ignition is first turned on, not while driving.
5-SPEED AUTOMATIC WITH SEQUENTIAL SPORTSHIFT, PADDLE SHIFTERS AND GRADE LOGIC CONTROL
To maximize acceleration performance, fuel economy and driver control, the RL has a standard 5-speed automatic with Sequential SportShift, paddle shifters and Grade Logic Control. Mechanically related to the extremely compact transmission that made its debut in the previous generation MDX, the RL unit has upgrades and enhancements to suit the greater power output and higher engine speeds of the RL.
Designed for low maintenance and a high level of durability, the RL transmission requires no scheduled service until 120,000 miles when operated under normal conditions. To provide strong off-the-line acceleration coupled with a relaxed, fuel-efficient cruising rpm, the unit has the widest ratio spread of any 5-speed automatic transmission in the RL's class.
Automatic Mode
The Sequential SportShift transmission can be operated in a conventional fully-automatic mode via a front center console-mounted gated shifter. When in automatic mode, the transmission incorporates an advanced Grade Logic Control System and Shift Hold Control, both of which work to reduce gear "hunting" and unnecessary shifting.
Shift Hold Control keeps the transmission in its current (lower) gear ratio when the throttle is quickly released and the brakes are applied (as might be the case when decelerating to enter a corner). Shift Hold Control leaves the chassis undisturbed by excess shifting, ensuring that abundant power is immediately available without a downshift.
Grade Logic Control alters the 5-speed automatic's shift schedule when traveling uphill or downhill, reducing shift frequency, and improving speed control. Throttle position, vehicle speed and acceleration/deceleration are continuously measured, then compared with a map stored in the transmission computer. The Grade Logic Control System then determines when the car is on a hill; if this is the case, the shift schedule is adjusted to automatically hold the transmission in a lower gear for better climbing power or increased downhill engine braking.
Manual Mode
The Sequential SportShift transmission can be shifted into manual mode by moving the front center console-mounted selector lever laterally to a special gate to the left of the "Drive" position. The RL offers two ways to change gears when in manual mode: either by a push or pull of the shift lever, or via F1®style paddle shifters mounted on the steering wheel. A digital display in the tachometer face indicates which gear the transmission is in. To heighten control and driver involvement, special shift logic in manual mode delivers quicker, firmer shifts than when in fully automatic mode.
To help protect the engine and drivetrain from damage, an array of preventative features are active when the transmission is in manual mode. In second, third and fourth gears, the logic changes and the transmission ECU cuts off fuel flow to the engine if there is a possibility of over revving.
In the rare situation where the fuel cutoff alone is unable to prevent engine over revving (as could happen on a steep downhill), the transmission will automatically upshift to prevent engine damage. And finally, when downshifting, the transmission won't execute a driver-commanded downshift that would send the engine beyond redline in the lower gear. The Sequential SportShift transmission will automatically downshift to first gear as the vehicle comes to a stop as to prevent lugging away from a stop in second gear.
5-POSITION SHIFT GATE
The RL benefits from an innovative 5-position shift gate that simplifies the operation of the transmission. The gate features a quiet linkage and a speed-controlled reverse lockout solenoid to prevent transmission damage. When operated in automatic mode, the transmission lets the driver choose D (1st through 5th gear) or D3 (1st through 3rd gear). Engine braking can be provided by moving from D to the D3 position, downshifting from 5th, 4th or 3rd gear, depending on the vehicle speed.
COOPERATION BETWEEN TRANSMISSION AND DRIVE-BY-WIRE
Both shift speed and smoothness are improved by cooperation between the drive-by-wire throttle system and the electronically controlled automatic transmission. The engine can be throttled by the engine management system during upshifts and downshifts, the function of the engine and transmission can be closely choreographed for faster, smoother shifting. As a result, the peak g-forces (or "shift shock") are reduced significantly during upshifts and downshifts.
SUPER HANDLING ALL-WHEEL DRIVE SYSTEM™
Super Handling All-Wheel Drive™ (SH-AWD™) is an innovative all-wheel drive platform that distributes the optimum amount of torque not only between the front and rear wheels but also between the left and right rear wheels. SH-AWD™ goes a step beyond conventional all-wheel drive by actively controlling the torque delivered to each rear wheel during corning. The result is more neutral, accurate steering when cornering under power that front-drive, rear-drive or conventional all-wheel-drive can't equal.
Torque splits are as follows:

• During straight-line cruising and moderate cornering below half throttle, up to 70-percent of engine torque is delivered to the front wheels.
• In full-throttle straight line acceleration, up to 40-percent of the power is sent to the rear axle.
• In hard cornering, up to 70-percent of available torque goes to the rear wheels for enhanced chassis balance. Up to 100-percent of this torque can be applied to the outside rear wheel that can also be overdriven up to five percent by a built-in acceleration device if the situation dictates.

SH-AWD™ ingeniously varies the amount of torque to the left and right rear wheels. When cornering, a planetary gear set overdrives (or accelerates) the rear wheels while individual right and left clutch packs direct torque to either or both rear wheel(s), faster than the average of the front wheels to dramatically enhance the cornering, steering feel, overall handling and stability of the RL. The result is class leading cornering precision as well as enhanced traction.
Direct Yaw Control System Theory
SH-AWD™ counters understeer with a Direct Yaw Control System when under power. Spinning the outside rear wheel faster than the average speed of the two front wheels allows the system to use engine power to yaw the vehicle while turning. By relieving the front tires of some of the work of turning the car, the system reduces understeer and the vehicle stays more balanced and controllable. In addition, with the cornering load more evenly distributed between the front and rear tires, the total cornering grip is increased. In conventional cars, cornering is created almost entirely by the steering angle of the front tires. With the RL, cornering is created by steering angle of front tires combined with the extra drive torque supplied by an outside rear tire.
This is a significant advance over conventional drive systems. To deal with high power output, front- or rear-drive systems generally use some type of limited-slip device to maintain traction under power. The linking effect of the inside and outside drive wheels in these systems resists turning, however. This is a factor that works against the front tires as they attempt to turn the car. Conventional AWD systems have a similar linking effect between the inboard and outboard tires and front and rear axles, causing a similar resistance to turning. This is part of the reason why traditional AWD systems typically lack the more nimble feel of the best two-wheel drive systems. By using drive torque to help turn the car, the RL is more responsive, neutral and predictable, while simultaneously offering all of the usual benefits of all-wheel drive.
Electronic Controls and Parameters
The logic and control of SH-AWD™ is integrated with the RL Engine Electronic Control Unit (ECU) and Vehicle Stability Assist™ (VSA®) ECU. The Engine ECU provides engine rpm, intake manifold pressure, and transmission gear ratio data. The VSA® ECU provides data on lateral g, yaw rate, wheel rotation speed and steering angle. The SH-AWD™ ECU monitors the status of the acceleration device and the right and left Direct Electromagnetic Clutch torque. Traction is calculated based on the information from the engine ECU. During an acceleration situation, lateral g and steering angle are used to calculate the torque split between the right and left rear wheels. At the same time, this data is used to control the acceleration device.
SH-AWD™ System Layout
SH-AWD™ is a full-time all-wheel drive system that requires no driver interaction for operation. A torque transfer unit is bolted directly to the front-mounted transaxle. Attached to the front differential ring gear is a helical gear that provides input torque to the transfer unit. A short horizontal shaft and a hypoid gear set within the case turn the propeller shaft ninety degrees and move it to the vehicle center line. A lightweight carbon fiber reinforced composite propeller shaft carries power to the rear drive unit.
The rear drive unit of the RL contains three planetary gear and clutch sets. Torque from the propeller shaft passes through the first clutch/planetary gearset, which as a unit is called the Acceleration device.
Output torque from the Acceleration device is carried a short distance rearward to a hypoid gear that turns the output 90-degrees and drives the rear axle shafts. A matched pair of Direct Electromagnetic Clutch systems, one on each side, send power to each rear wheel. These clutch systems can be controlled as a pair to alter the front/rear torque split, or depending on the situation, the rear wheels can receive between 30- to 70-percent of the engine's total output. The right and left Direct Electromagnetic Clutch systems can also be controlled independently, to allow up to 100-percent of the total rear axle torque to go to only one rear wheel.
Acceleration Device
Positioned at the front of the RL rear drive unit, the Acceleration device typically passes torque to the rear axle at very close to a one-to-one ratio. In cornering, however, the Acceleration device's output shaft spins faster than its input shaft.
The Acceleration assembly uses a compact planetary gearset to achieve its speed increase. Hydraulic actuators operate clutch packs that control the planetary gearset. When the input shaft is locked with the planetary gear carrier, there is no ratio change (this is the straight-line mode). During cornering, the carrier is coupled with the case, and the output shaft speed increases up to five percent. A speed sensor at the hypoid gear, downstream of the Acceleration device, provides a feedback loop to the SH-AWD™ Electronic Control Unit to ensure that the system is working properly.
Direct Electromagnetic Clutch Systems
Located on either side of the hypoid gear that drives the rear axle, two identical Direct Electromagnetic Clutch systems control the amount of drive torque that reaches each rear wheel, and provide limited-slip differential function. An electric coil controls the pressure applied to a clutch, which slows the sun gear in a planetary gearset to modulate the torque that is sent to the wheel. The amount of torque transmitted to each rear wheel can vary continuously, between zero and 100-percent, depending on the conditions.
Under deceleration (throttle closed) while cornering, torque to the outside rear wheel is varied to change from an inward to an outward yaw moment, helping vehicle stability. A search coil sensor allows the ECU to estimate the clutch plate coefficient of friction (that changes with heat) and then adjusts voltage sent to the electromagnetic coil that controls the clutch to compensate. To ensure that the amount of torque transmitted remains optimized as miles and wear accumulate, a coil provides a feedback loop that the ECU uses to adjust voltage to the electromagnetic clutches to compensate for clutch wear.


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Torrance, Calif. - Sep 11 —BODY DESIGN & STRUCTURE
The 2008 Acura RL combines its dynamic exterior and interior design with advanced body and chassis engineering. The result is distinctive and appealing styling, together with excellent maneuverability on the road. To ensure that the RL has exceptional dynamic capabilities and driving quality, it is outfitted with a lightweight and highly rigid body structure that makes extensive use of both high-tensile steel and aluminum components, and features 4-wheel independent suspension.
DESIGN CONCEPT
Acura designers wanted to create a taut and athletic shape that conveyed the performance capabilities of the RL without sacrificing comfort and capability.
To create an exhilarating, athletic sedan, the designers targeted superior dynamic performance, superb maneuverability, distinctively appealing styling, and a high level of active safety. The result is a top-flight luxury performance sedan able to compete with the Audi A6, BMW 5 Series, Mercedes-Benz E Class and others.
Design Image
Acura designers set out to give the RL a pronounced sporting persona. To help craft the image, styling cues included the following:

• Taut, athletic body design with European influence
• Aerodynamic design with low drag and high stability
• Low hood line for increased forward visibility and reduced aerodynamic drag
• Flush side glass for reduced wind noise
• Short tail for reduced aerodynamic drag and improved maneuverability

Aero Sculpture
The aerodynamic properties of the RL complement the styling, safety, dynamic performance, stability, human factors and other considerations. To achieve this high-performance exterior, the RL designers created a strong wedge shape that begins its "momentum" with the hood, continues it with a forward-mounted windshield, and finishes with a short rear overhang. The aerodynamic cabin has flush side glass for reduced drag and less wind noise. Along with outstanding aerodynamic performance, the RL is designed to look like it moves fast.
Packaging
The packaging goal for the RL was to create a taught body with short overhangs and wide interior dimensions for enhanced comfort and convenience.
Controlling the weight of the RL was important for maximum acceleration, road holding and braking performance — so lightweight materials and weight-saving design were key.

BODY STRUCTURE
Light Weight
Producing a lightweight and rigid unit body was essential to making the RL a premium luxury sport sedan. This is because light weight improves every aspect of dynamic performance and fuel economy, and a rigid structure improves ride and handling quality.
Specific RL strategies employed to reduce body mass include:

• Aluminum hood, front fenders, trunk lid, and trunk lid frame
• Aluminum front and rear subframes, suspension arms and bumper beams
• Magnesium cylinder head covers and seat frames
• Carbon fiber reinforced composite drive shaft

Structural Solidity
The Acura RL was also designed with the goal of creating an automobile body that provides world-class safety. It was engineered to comply with the latest FMVSS 208 occupant crash protection standard and FMVSS301 fuel system integrity standard.
One of the most difficult test modes to achieve is the side collision that models the impact of a RL being struck from the side by an SUV or a pickup truck. To meet these important benchmarks, engineers increased the side section of the frame to comply with new collision regulations (see Safety section for more information). They also chose different material specifications to provide the desired level of stiffness and strength for critical areas, without adding unnecessary weight.
The use of aluminum for the front and rear bumper beams, hood, trunk lid and front fenders saves 40 pounds compared to if made from steel

• Extremely strong Grade 80 high-tension steel is used for the side sills, under-floor spars, and in the impact-absorbing crumple zones at the front of the side frames
• Strong high tension Grade 45 steel is used on the front shock mounts, areas of the front passenger-compartment bulkhead, areas of the front subframe mounts, and rear structure
• 31-percent of the body is constructed with Grade 60 steel

The overall result is a high level of bending and twisting rigidity for the unit body combined with enhanced crashworthiness, all with no additional weight penalty.
ALUMINUM COMPONENTS
The lightweight aluminum hood, front fenders, trunk and trunk frame are formed with an innovative process called blow forming to achieve complex and pleasing shapes with a high level of quality, low cost and lightweight construction. First the raw aluminum panels are placed in a heated mold and warmed to 500-degrees Celsius. Then the aluminum panels are forced into the mold with a high-pressure gas. The result is perfectly formed complex shapes that are not possible with traditional stamping methods.
For rigidity, the trunk lid is composed of an inner structural panel and an outer body panel. This 2-piece aluminum structure is crimped together with a self-piercing rivet that makes the lid highly durable.
DOOR CONSTRUCTION
Safety in side collisions, along with the pursuit of a quality door-closing sound, drove engineers to design all-new door structures. Special beams were applied for side-impact safety in both the front and rear doors.
There is no mistaking the quality sound a well-engineered door makes as it is closes. By positioning door's center of gravity (the height at which its weight is centered) at the same height as the latch, audible vibration and thus the closing sound can be improved. For improved entry and exit the rear doors now open 80-degrees.
TRUNK OPENING
The trunk opening is reinforced to retain rigidity while providing a large, low opening for easier loading. Inside, the opening is finished to hide the hinges and to cover the rain gutters (see Interior section for more information).
WINDSHIELD WIPERS
To decrease wind noise levels and improve appearance, the RL incorporates hidden pivots and wiper arms for its speed-sensing, variable intermittent windshield wipers. The pivots are hidden underneath the trailing edge of the hood line to reduce noise levels, improve aerodynamics, and enhance appearance.
The use of a hidden windshield wiper pivot is a world's first. The hidden pivot improves aerodynamic efficiency and reduces visual distraction when the wipers reverse direction. A new cowl garnish below the windshield wipers also reduces wind noise, contributing to a significant reduction in wind noise.
Another advantage of hiding the wiper pivot is enhanced outward visibility. Hiding the pivot increases the passenger's forward visibility.
AERODYNAMICS
A highly efficient aerodynamic drag coefficient of 0.29 for the Acura RL pays dividends in the form of lower wind noise, improved fuel economy, increased performance, and enhanced stability on the highway. An air dam reduces front end lift force. An engine undercover and floor undercovers further smooth airflow, as do muffler covers and a rear diffuser, which help rear differential's cooling and result in rear lift force reduction.
ACTIVE FRONT LIGHTING SYSTEM
Models equipped with either RL with Technology Packages feature an Active Front Lighting System (AFS). The AFS system uses Xenon High-Intensity Discharge (HID) headlights, 55-watt fog lights, and daytime running lights (DRL).
In the Active Front Lighting System, the left low-beam unit can swivel left, and the right low beam can swivel right, to improve illumination while cornering, or to illuminate around the corner of an intersection. This allows the driver advance warning if a pedestrian, animal, or object is in the way. Each light can swivel up to 20-degrees outboard, with the amount determined based on the vehicle speed and steering input.
The Active Front Lighting system uses the following components:

• Steering angle sensor
• Vehicle speed sensor
• Reverse switch (cancels AFS when car is backing up)
• Control switch (turns off AFS at driver's discretion)
• Instrument panel warning light (illuminates when AFS is turned off)
• Control unit swivels the low beam headlight projector unit via a gearbox motor

AFS swivels either the left or right headlight (not both together) when the following conditions are met:

• Steering angle is over 12-degrees
• Vehicle speed is 5 mph or higher (left-hand turns only)
• Right-hand headlight will swivel even if vehicle is stopped
• Swivel cancels when speed drops to 3 mph (left-hand turns only)

XENON HIGH-INTENSITY DISCHARGE (HID) HEADLIGHTS
Traditional headlight bulbs illuminate a tungsten filament inside a sealed bulb containing halogen gas. Xenon HID bulbs, however, use a high voltage current that passes between two electrodes to create a plasma arc. This accounts for their brightness and "daylight-like" illumination.
Xenon is superior to tungsten-halogen bulbs in lumens, or lighting power. The Xenon HID bulbs on the RL provide a lighting pattern that is both longer and wider than that of traditional non-Xenon bulbs. In addition, the RL's tungsten-halogen high beams provide a wide illumination spread. The low beams on the RL have a brightness of 825 lumens. For the driver, these advances mean greater illumination for enhanced confidence.
Additionally, the Xenon HID low-beam headlight bulbs have a projected life span of 1,500 hours compared to 1,000 hours for a normal bulb.
LED LIGHTING
The RL features advanced Light Emitting Diode (LED) lighting systems. These include mirror-integrated directional turn signals, each of which features bright LED lights to alert motorists who are alongside when the RL driver is planning to change lanes or make a turn.
Each taillight/brake light assembly has an array of 28 LEDs. The taillights use 14 LEDs, arranged as the perimeter of a circle, and the brake lights use an additional 14 LEDs. When the brakes are applied, all 28 LEDs light up, illuminating the entire area.
The center high-mounted stop lamp (CHMSL) also uses LEDs. The projected service life of the RL LEDs is 2,000 hours.
DAYTIME RUNNING LIGHTS
Similar to the 2008 MDX, RDX and TL, the RL features Daytime Running Lights (DRL) to improve visibility while driving.
5 MPH BUMPERS
To minimize repair costs in minor, low-speed collisions, the RL has 5-mph bumpers front and rear.
NOISE VIBRATION AND HARSHNESS (NVH)
The elimination of undesirable noise, vibration and harshness (NVH) was of primary concern to RL development engineers. Virtually everything that could be the source of these NVH traits was scientifically reviewed and modified during the planning and prototype phases.
Acura wanted to provide RL clients with outstanding horsepower, an innovative all-wheel drive system and large-diameter high-performance tires for advanced handling characteristics. At the same time, they wanted the car to remain refined and quiet for highway cruising while simultaneously generating a stirring high-performance engine sound during acceleration. These attributes, along with light overall vehicle weight, were achieved through the application of innovative technology.
The RL dramatically reduces high frequency and middle-frequency noise attenuation. Road noise attenuation is also improved over both smooth and rough roads. As part of the mission to control weight, Acura used lightweight materials wherever possible in the sound-absorbing package, including lightweight sound insulators instead of traditional heavier materials. In addition, the RL represents Acura's first use of an Active Noise Cancellation® system (ANC®). See Interior section for more information.
Main RL NVH advancements:
Drivetrain

• Engine mounting system including a hydraulic lower transmission mount
• Variable volume exhaust mufflers
• Hood insulator
• Engine cover and undercoverBody
• Acoustic roof lining
• Acoustic front and rear inner fender insulator with high-frequency damping materials

Flooring

• Lightweight floor insulator
• Floor undercover

Subframes

• Floating front and rear subframes with four mounting points

Interior

• ANC® system for noise control (see Interior section for more information)
• Lightweight instrument panel damping materials
• Thinsulate® insulation in selected areas

Trunk

• Acoustic design with side, front and lid linings

POWER WINDOWS
The side power windows on the RL are made of glass that is 5 mm thick to reduce cabin noise. Each window features an auto-open and auto-close function, an auto-reverse safety feature, as well as key-off operation.
FLUSH GLASS
The Acura RL is the first car in the world to have totally flush side glass where it meets the B-pillars. Normally, a gap of about 5 mm exists between side glass and the B-pillar. On the RL, the window guide is on the glass instead of the window frame, which allows the gap to be eliminated. This means there is one continuous uninterrupted plane running along the front side window, across the B-pillar and all the way to the trailing edge of the rear side window. The benefit is a further reduction in wind noise and an even cleaner, high quality appearance.
EXTERIOR MIRRORS
To reduce wind rush and turbulence, exterior mirror housings need to be small and aerodynamic, without unnecessarily reducing the mirror area. On the RL, the power mirror element is precisely sized to fit inside a compact housing to reduce these unwanted characteristics.
The airflow between the mirror housing and the side window glass is likewise crucial for reducing turbulence and noise. Engineers designed this gap as an expanding V-shape, with the gap narrower at the front and wider at the rear. This helps the airflow decelerate as it flows across the glass, instead of accelerating as it would if the V-angle were to decrease. The result is smoother airflow and less mid- and high-frequency noise.
EXTERIOR PAINT
The exterior paint on the Acura RL uses an environmentally conscious water-based process. The painting procedure begins with an electrodeposition (ED) primer, which is electrically charged in the paint bath to help the primer better adhere to the metal bodywork. The ED primer is cured at high temperature to improve corrosive durability. Next applied is a primer-surfacer that is hand sanded to ensure a smooth surface for better appearance. After a waterborne color basecoat is applied, a pair of clearcoats provides depth while helping to protect the base coat from air pollution, acid rain and sun damage.
Eight different exterior colors are available, including three metallic colors and five pearl colors. All eight colors are selectively available with three different interior colors. The chart below shows the available exterior/interior color combinations (see Interior section for more information).
EXTERIOR COLOR INTERIOR COLOR
Parchment Ebony Taupe Premium White Pearl x x
Opulent Blue Pearl

x Redondo Red Pearl x

Carbon Gray Pearl
x x Platinum Frost Metallic
x x Nighthawk Black Pearl x x
Lakeshore Silver Metallic
x x Desert Mist Metallic x



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2008 Acura RL Features Super Handling All-Wheel Drive? (SH-AWD?) and a Comprehensive Package of Advanced Technologies to Deliver Exceptional Performance, Comfort and Control

Torrance, Calif. - Sep 11 — The Acura RL enters the 2008 model year as one of the most sophisticated and exhilarating touring sedans on the road today, putting the driver in command of their environment while delivering extraordinarily athletic performance within the luxury performance sedan class.

With an advanced and efficient 3.5-liter SOHC VTEC® V-6 engine, Acura's exclusive Super Handling All-Wheel Drive™ System (SH-AWD™), and cutting-edge technologies including available AcuraLink™ with real-time traffic, Active Front Lighting System (AFS), Collision Mitigation Braking System™ (CMBS™) with Adaptive Cruise Control, and Active Noise Cancellation™ (ANC), the RL is the bearer of technology-enhanced performance, luxury and comfort in the Acura sedan lineup.

"The RL is a forward thinking luxury sedan that provides a truly exceptional balance of performance, efficiency, and technology-enhanced driver control," said Dick Colliver, vice president, sales. "There isn't another car in its price class that comes close to delivering the level of customer relevant technology as the RL."

For 2008, the RL continues to be offered in three trim levels: the luxuriously appointed RL; the RL with Technology Package that adds Acura Satellite Navigation System and AcuraLink™ with real-time traffic, Active Front Lighting System and an upgraded wood interior; and the RL with Technology Package plus CMBS and PAX®, featuring Acura's state-of-the-art Collision Mitigation Braking System™ (CMBS™), Adaptive Cruise Control (ACC) and Michelin PAX® run-flat tire technology.


Powertrain
Powered by an advanced and efficient 3.5-liter, 24-valve, all-aluminum SOHC VTEC V-6 engine replete with variable flow exhaust and drive-by-wire throttle, the RL is Acura's most powerful sedan, turning out 290 horsepower at 6200 rpm and 256 lb-ft of torque at 5,000 rpm The engine is coupled to a Sequential SportShift 5-speed automatic transmission that enables driver-controlled gear changes using the shift lever or steering wheel-mounted paddle-shifters.

The transmission is paired with Acura's exclusive Super Handling All-Wheel Drive™ system (SH-AWD™) for superior cornering ability, handling stability and all-weather control. The highly innovative SH-AWD™ platform distributes the optimum amount of torque not only between the front and rear wheels but also between the left and right rear wheels. During straight line cruising and moderate cornering, up to 70-percent of torque is delivered to the front wheels for optimal efficiency. During full throttle acceleration or spirited driving, up to 70-percent of available torque is directed to the rear wheels for increased acceleration and cornering traction. When cornering, SH-AWD employs an exclusive acceleration device that overdrives the outer rear wheel by up to 105-percent of the wheel's normal rotational speed, while electromagnetic clutches send up to 100-percent of rear torque to a specific wheel, thus dramatically enhancing the RL's cornering capability.


Body and Chassis
To complement the high-performance powertrain, Acura engineers gave the RL a highly rigid yet lightweight Advanced Compatibility Engineering™ (ACE™) unit body structure, critical for achieving the engineers' high targets for steering and handling precision, outstanding ride quality, isolation of undesirable road inputs along with outstanding safety.

The RL's body is constructed primarily of high-grade, high tensile steel, while the hood, trunk lid, and front fenders and bumper beams are made of lightweight and highly rigid aluminum. A sophisticated four-wheel independent suspension system with double-wishbone front and multi-link rear design, mounted to isolated front and rear subframes, works in concert with rigid unit body construction to complete the RL's lithe and luxurious chassis setup. Subframes and suspension components made of aluminum further reduce the RL's weight for more supple suspension action, improved performance, and better fuel economy.

The RL is fitted with Michelin P245/50R17 98V all-season high performance tires on 17x8-inch alloy wheels. The RL with Technology Package plus CMBS™ and PAX® features P245/680R 460A 102V Michelin® PAX® run-flat tires mounted to unique alloy wheels.
Powerful, responsive and predictable braking action is supplied by a powerful four-wheel disc brake system utilizing aluminum 4-piston front calipers matched with 12.6-inch diameter ventilated front brake rotors and 12.2-inch solid rear rotors with large single-piston calipers. Braking is further aided by the latest advancements in safety technology including four-channel ABS with Electronic Brake Distribution (EBD) and Brake Assist.

RL models equipped with the Technology Package also feature the Active Front Lighting System (AFS) with Xenon High-Intensity Discharge (HID) headlights that swivel up to 12 degrees laterally in response to vehicle speed and steering wheel input. When cornering, the inboard light swivels to illuminate a larger area of road surface throughout the corner, improving down-the-road visibility and minimizing blind spots.

The RL with Technology Package plus CMBS™ and PAX® also boasts the first application of Acura's Collision Mitigation Braking System™ (CMBS™). Using millimeter-wave technology, CMBS™ monitors the distance and closing rate between the RL and the vehicle directly in front of it. It then uses that information to continuously calculate the likelihood of a frontal collision.

CMBS™ operates in three stages: In the first two stages, if the system determines that the closing rate between the two vehicles has increased beyond an acceptable level, the RL first uses audible, visual and tactile warnings to alert the driver. If the condition goes unchanged, stage two of CMBS involves the activation of light braking. If the system determines that a collision is unavoidable, a third stage retracts the driver's and front passenger's seatbelts and activates the brakes to reduce the speed of impact thus helping to mitigate the damage of a collision.

The optional CMBS ™ package also includes Adaptive Cruise Control (ACC), which adjusts vehicle speed automatically to compensate for the varying speed of traffic flow. Michelin® PAX® run-flat tires provide enhanced mobility and convenience by allowing the RL to drive up to 125 miles at 50 mph in the event of a tire puncture.


Exterior/Interior
The RL's exterior styling underscores its advanced performance and technology leadership. At the vehicle's front, a dramatically sloping hood leads down to an aggressive front fascia with angular headlight treatments, a signature Acura five-sided grill and distinctive lower air intake openings. A sleek cockpit, a forward sloping beltline and a short deck lid accent the RL's pronounced wedge shape, making it look fast from any angle.

Inside, the RL with Technology Package is as luxurious as it is sporty. The interior features rich leather, genuine wood trim, and an assortment of leading-edge technologies to enhance driver control and information access. These technologies include Acura HandsFreeLink™, a Bluetooth®-based wireless phone interface that allows calls to be made and received utilizing the RL's steering wheel-mounted HandsFreeLink buttons.

Another key component of the RL Technology Package is the Acura Navigation System with Voice Recognition™. This easy to use system features a menu of 685 voice commands, a comprehensive destination guide with over 7 million points of interest, 3-D graphics for freeway interchanges, on and off-ramps and turn-by-turn voice guidance. In addition, 1.7 million U.S. cities and street names may be accessed through the voice recognition command. The system can be accessed through the steering wheel-mounted voice recognition buttons or by using the Interface Dial located on the instrument panel. Previously, the Acura Navigation System worked in the lower 48 U.S. states, but for 2008 it now works in Hawaii as well.

Acura real-time traffic provides live traffic information through the navigation system, displaying a variety of up-to-the-minute information including traffic flow (traffic speed), accidents, and freeway construction. For 2008, real-time traffic coverage has expanded by 32 markets to include a total of 76 major metropolitan areas including Los Angeles, New York and Chicago. Traffic flow and accident information are updated continuously, allowing drivers to choose the least congested route to their destination.

In addition to enabling the real-time traffic feature, the AcuraLink™ satellite communication system allows for communication between Acura and the vehicle, providing the driver with the latest diagnostic information specific to their vehicle, as well as vehicle-related messages. Working with the HandsFreeLink™ wireless telephone interface, drivers can respond to AcuraLink™ messages or they can one-touch-dial Acura dealers or Acura Roadside Assistance (TLC®) using their Bluetooth®-enabled mobile phone.

The RL also features a standard premium 10-speaker Acura/BOSE® DVD-Audio system that uses Bose Cabin Surround™ circuitry to deliver surround vibrant sound to all seating positions. This innovative system utilizes eight distinct channels (compared to two channels on a typical premium stereo system) to deliver sound resolution 500 times greater than traditional CD. In addition, Centerpoint™ signal processing circuitry processes stereo recordings to five independent channels thus delivering simulated surround sound from conventional CDs. With Active Noise Cancellation™ (ANC), undesirable road, wind and other intrusive noise is greatly reduced through noise cancellation technology that creates a precisely timed reverse phase audio signal to reduce unwanted noise by up to 10 decibels. In addition, with the application of AudioPilot® noise compensation technology, constant monitoring of cabin noise occurs to which the audio system's sound balance is continually adjusted to deliver a constant level of perceived music volume.

The RL is the only Acura equipped with the Keyless Access System™, allowing the owner to lock and unlock doors, open the trunk, and start the car without using a key. When the key fob is brought within approximately two and a half feet of the car, the system electronically links and the doors can be locked or unlocked simply by touching the RL's door handle. Rather than hunting for and then inserting a traditional ignition key, the engine is turned on and off via a switch mounted on the steering column.

The RL, like all 2007 Acura models, is covered by a six-year/70,000 mile limited powertrain warranty and a four-year or 50,000 mile limited standard bumper-to-bumper warranty. Additional ownership benefits include Acura Total Luxury Care (TLC®), which provides free 24-hour roadside assistance, concierge service and trip routing.


Safety
In keeping with Acura's "Safety Through Innovation" initiative, the 2008 RL is equipped with a comprehensive array of the latest technologies to enhance active safety (accident avoidance) and passive safety (crash protection). On the active safety front, all RL models feature SH-AWD™, Tire Pressure Monitoring System (TMPS), Vehicle Stability Assist™ (VSA®) with traction control, Electronic Brake Distribution (EBD) and Brake Assist. Brake Assist continually analyzes the driver's normal braking habits, monitoring both the rate of pressure applied along with total pressure, and then uses this information to help the driver to more quickly apply full braking pressure in an accident avoidance situation.

In the event of an accident, the RL employs a series of passive safety features working in concert to absorb and re-direct the energy of a collision. These features include a reinforced, energy-absorbing frame structure, a sophisticated supplemental restraint system, dual-stage front airbags, driver and front passenger side airbags, and side curtain airbags. The passenger's side airbag features an Occupant Position Detection System (OPDS) to prevent airbag deployment if a child or small-stature adult leans into the deployment path.

The RL, along with the all-new RDX and MDX sport-utility vehicles, utilizes Acura's unique Advanced Compatibility Engineering™ (ACE™) body structure. ACE™ employs a network of front frame structures that better distribute collision forces through the body structure and away from the passenger cabin.

The RL has earned 5-star ratings (the best possible) for frontal and side crash tests, and for rollover resistance, from the U.S. Department of Transportation's Highway Traffic Safety Administration (NHTSA). The RL is the fourth vehicle in the history of the program to earn the top rating of "five stars" in all three test categories. Government star ratings are part of the National Highway Traffic Safety Administration's (NHTSA) New Car Assessment Program (www.safercar.gov). In addition, the Insurance Institute for Highway Safety (IIHS) awarded the RL a GOOD rating in Side Impact Collision Evaluation (SICE) along with a GOOD rating for IIHS' frontal offset crash test.


Acura
Acura offers a full line of technologically advanced performance luxury vehicles through a network of 268 dealers within the United States. The 2008 Acura lineup features five distinctive models including the RL luxury performance sedan, the TL performance luxury sedan, the TSX sports sedan, the turbocharged RDX luxury crossover SUV and the award-winning MDX luxury sport utility vehicle.

For additional information about Acura vehicles, please visit www.acura.com. For media inquiries, please go to www.acuranews.com.


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Torrance, Calif. - Sep 11 —OVERVIEW
The 2008 Acura RL combines performance, technology, style and safety in an athletic luxury package that pushes the boundaries of automotive design on multiple fronts. No production car at any price has ever offered more advanced electronic technology or drive system sophistication. All the while, none has made its driver more connected to the surroundings on the road – with real-time traffic information, personal assistance, phone communication and audio entertainment. True to form for Acura, the many advanced systems of the RL are engineered to be as consumer-friendly as possible.
Also, as part of its continued commitment to providing Safety Through Innovation, Acura will again highlight the availability of two available Technology Packages on the RL:

• RL with Technology Package includes: Acura Satellite Navigation System and AcuraLink™ with real-time traffic, Active Front Lighting System (AFS) and an upgraded wood interior
• RL with Technology Package plus CMBS™ and PAX® Tires: includes Acura's Collision Mitigation Braking System™ (CMBS™), Adaptive Cruise Control (ACC) and Michelin® PAX® run-flat tires

CMBS™ uses a millimeter-wave radar unit mounted inside the RL's front grille to detect vehicles ahead and to monitor potential rear-end collisions, to alert the driver when the likelihood of a collision increases, and to help reduce the impact on front occupants by tightening the seatbelts and applying the brakes should a collision prove to be imminent.
The Michelin® PAX® system run-flat tire technology helps provide enhanced mobility and security with continuous mobility of up to 125 miles at 50 mph following a tire puncture.

RL with Technology Package plus CMBS™ and PAX® Tires also adds the convenience of Adaptive Cruise Control (ACC). Adaptive Cruise Control also uses the radar system mounted inside the front grille to measure the distance between the RL and the vehicle directly ahead. To compensate for varying traffic flow, ACC continually adjusts vehicle speed by automatically applying throttle and braking to maintain a consistent following interval.
The innovation built into the RL begins with the most powerful engine ever offered in a production Acura sedan. The 3.5-liter VTEC™ V-6 engine develops 290 horsepower and 256 lb-ft of torque. In addition to developing abundant power, the RL engine meets tough ULEV-2 emission standards and delivers excellent fuel economy of 16/24 mpg* (city/highway).
A Sequential SportShift 5-speed automatic with F1®-style paddle shifters and Grade Logic Control sends power to the standard Super Handling All-Wheel Drive™ (SH-AWD™) system. There are numerous traction advantages of all-wheel drive and SH-AWD™ does something no other current AWD system can: it increases the rotation speed of the outside rear wheel during aggressive cornering to help the car turn more effectively under power. This function reduces the cornering load on the front tires to reduce understeer, to improve handling balance and total cornering grip.
The RL exterior's aggressive style foreshadows the power beneath the hood. Its shape is taut and athletic, and its acceleration and cornering performance allow it to challenge the most capable German and Japanese sports sedans. Comfort, quietness and ride quality are also on a par with all competitors.
The extremely rigid Advanced Compatibility Engineering™ (ACE™) body structure of the RL features extensive use of high-tensile steel and lightweight aluminum components to take construction beyond conventional safety protocols while keeping weight in check. Optimized fully independent suspension with front double-wishbone and multi-link rear design, large brakes and aggressive 17-inch aluminum-alloy wheels work together to further enhance the reflexes of the RL.
The elegantly styled interior includes perforated leather-trimmed seats, wood-styled accents and top-rate materials. These are complemented by the most advanced electronics available including the Acura Satellite-Linked Navigation System with Voice Recognition™, the innovative AcuraLink™ satellite communication system with real-time traffic, Active Noise Cancellation (ANC), and a spectacular Acura/Bose® 10-speaker Surround Sound System. Safety is also enhanced with a standard passenger seatbelt reminder, Tire Pressure Monitoring System (TPMS), and side curtain airbags. These advances team to make the RL the strongest, most powerful, best handling and most luxurious sedan Acura has ever built.
Like all Acura models, the RL is covered by a six year or 70,000 mile limited powertrain warranty in addition to the four-year or 50,000 mile standard bumper-to-bumper warranty.*Based on 2008 EPA mileage estimates, reflecting new EPA fuel economy methods beginning with 2008 models. Use for comparison purposes only. Do not compare to models before 2008. Your actual mileage will vary depending on how you drive and maintain your vehicle.

Powertrain Features:

• Super Handling All-Wheel Drive™ (SH-AWD™)
• 5-speed automatic with Sequential SportShift, paddle shifters and Grade Logic Control
• 3.5-liter SOHC VTEC® V-6 engine
• 290 horsepower @ 6200 rpm
• 256 lb-ft of torque @ 5000 rpm
• VTEC™ (Variable Valve Timing and Lift Electronic Control) valvetrain
• Drive-by-wire throttle system
• Variable flow exhaust system
• 11.0:1 compression ratio
• High inertia dual-stage intake manifold
• Direct ignition system with detonation/knock control
• Computer-controlled Programmed Fuel Injection (PGM-FI)
• Meets CARB LEV-2 ULEV emissions standard
• 100,000 miles or more tune-up interval

Body and Chassis Features

• Unit body with extensive use of high-tensile steel and aluminum
• Lightweight aluminum front and rear subframes
• Independent double-wishbone front suspension
• Independent multi-link rear suspension
• Electronically controlled, speed-sensing, variable power-assist rack-and-pinion steering
• 17x8-inch aluminum-alloy 5-spoke wheels
• Michelin P245/50R17 98V high performance, all season tires
• Available Michelin PAX® run-flat high performance, all-season tires (included with the RL Technology Package plus CMBS™ and PAX® Tires)
• 4-wheel anti-lock braking system (ABS) with Electronic Brake Distribution (EBD)
• Xenon High-Intensity Discharge (HID) headlights
• Active Front Lighting System (AFS) (included with Technology Package)
• LED backlit gauges with progressive illumination
• Flush junction between side glass and B-pillars
• Power moonroof with tilt, automatic open/close, auto-reverse and key-off operation
• Heated outside mirrors with driver recognition, reverse gear mirror tilt-down and integrated directional signals

Comfort & convenience features:

• Acura/Bose® 10-speaker Surround Sound System with 6-disc CD, DVD-Audio, and DTS® changer and AM/FM tuner
• Active Noise Cancellation™ system
• MP3 auxiliary jack
• Keyless Access System™
• Bluetooth® HandsFreeLink® wireless telephone interface for Bluetooth® phones
• Acura Satellite-Linked Navigation System with Voice Recognition™ and real-time traffic (included with Technology Package)
• Standard rearview camera on models equipped with navigation
• Available Adaptive Cruise Control (ACC) (included with CMBS™ and PAX®)
• GPS-linked, solar-sensing, dual-zone, dual-mode automatic climate control
• Driver's 8-way power seat with power adjustable lumbar support
• Front passenger's 4-way power seat with power adjustable lumbar support
• Electronic tilt and telescoping steering column with driver recognition
• Multi-Information Display (MID)
• Power rear sunshade
• Rear side sunshades
• Remote retractable rear headrests
• Leather-wrapped steering wheel

Safety features

• Advanced Compatibility Engineering™ (ACE™) body structure
• Impact-absorbing crumple zones (front/rear)
• Side impact door beams
• Tire Pressure Monitoring System (TPMS) with location and pressure indicators
• Driver's and front passenger's dual-stage, dual-threshold airbag Supplemental Restraint System (SRS)
• Driver and front passenger side airbags with front passenger Occupant Position Detection System (OPDS)
• Side curtain airbags for front and rear outboard seats
• Optional Collision Mitigation Braking System™ (CMBS™) (available in the RL Technology Package with CMBS™ and PAX® Tires)
• 3-point adjustable height seat belts with load limiters and front pretensioners
• 3-point seat belts at all seating positions
• Automatic Locking Retractor/Emergency Locking Retractors (ALR/ELR)
• Front head restraints adjustable for height and tilt
• Remote retractable rear seat head restraints
• LATCH (Lower Anchors and Tethers for CHildren) child-seat mounting system
• Vehicle Stability AssistTM (VSA®) with traction control
• Anti-lock Braking System (ABS)
• Brake Assist

MARKET SUMMARY
V-6 powered sedans are the highest volume sellers in the RL's segment. Because they represent the core of the market, Acura decided to build the best V-6 powered luxury performance sedan possible. Hence the 290-hp V-6 powered RL was created. By choosing not to implement use of a V-8, which accounts for only 15-percent of the vehicles sold in this market segment, it meant that the RL would be lighter, more nimble, and better balanced.
Key 6-cylinder competitors in the RL's segment include the BMW 528i, Audi A6 3.2, Lexus GS 350, and Mercedes-Benz E350. However, with its SH-AWD™ system as standard equipment, the RL has a distinct advantage over each of those competitors.
POWERTRAIN
Powering the RL is a compact aluminum-alloy 3.5-liter SOHC VTEC® V-6 that is mounted transversely. The V-6 produces 290 hp and 256 lb-ft of torque while meeting stringent CARB LEV-2 ULEV emissions targets. Fuel economy numbers are 16/24 mpg (city/highway).
The RL comes standard with a Sequential SportShift 5-speed automatic transmission with steering wheel mounted paddle shifters and Grade Logic Control. Gears may also be shifted manually via a multi-gate shifter located on the front center console.
The defining powertrain feature of the RL is Super Handling All-Wheel-Drive™ (SH-AWD™). The system continuously varies the engine torque split between the front and rear wheels as well as with the left and right rear wheels. To help the RL arc through corners with better chassis balance and more total grip, SH-AWD™ overdrives the outside rear wheel at a faster speed, using engine torque to help the car rotate into the turn.
BODY & CHASSIS
The RL body fits its role as a mid-luxury sports sedan with a muscular appearance and an aggressive, dynamic personality.
The unit body structure is stiff for superior handling precision and utilizes a variety of steel grades in different areas where maximum strength is required. In addition, the hood, front fenders, trunk lid, frame, front and rear subframes, bumper beams and major suspension components are manufactured from aluminum to reduce weight. Some of these components are formed using an advanced "blow forming" process that allows intricate shapes to be created without increasing the weight of the part.
Careful attention was paid to smoothing airflow over, under and around the RL's body, across the flush side glass and across the windshield wipers. A cowl garnish was installed at the lower part of windshield to reduce air turbulence, while an advanced exterior-mirror design contributes to improved quietness inside the car.
The independent front double-wishbone and independent multi-link rear suspension use aluminum arms that mount to aluminum subframes. Vehicle Stability Assist™ (VSA®) with traction control, large 4-wheel disc brakes with ABS and 17-inch aluminum-alloy wheels set new standards for RL dynamic performance.
The RL features the Active Front Lighting System (AFS) (available in the RL with Technology Package). To help the driver see around corners, the low-beam headlights can swivel laterally up to 20-degrees when certain steering angle and speed conditions are met. Xenon HID low-beam headlights, LED turn signals integrated in the exterior mirror housings and a Center High-Mounted Stop Lamp (CHMSL) dramatically increase visibility. Daytime running lights are standard, as is the Keyless Access System.
INTERIOR
The interior of the RL is more than just luxurious, sporty, and fully equipped with comfort and convenience features. Technology abounds in the form of the AcuraLink™ satellite communication system that includes the first ever U.S. application of real-time traffic information. This feature includes traffic information for 76 major metropolitan areas that the RL driver can access to see traffic tie-ups on major freeways. The information is delivered in real time via graphics displayed on the RL's MID screen. This real time information allows drivers to re-route themselves to clearer traffic corridors without relying on ambiguous radio traffic reports.
Other RL interior features are equally appealing. As an example, the innovative Adaptive Cruise Control (ACC) system is offered as part of the optional RL Technology Package plus CMBS™ and PAX® Tires. With ACC, when cruise control is activated the innovative system uses radar to allow the driver to set and maintain a specific following distance interval between the RL and the car directly in front of it.
The RL interior features luxurious styling, perforated leather-trimmed seats, and dramatic LED backlit gauges with progressive illumination. Premium technologies define the interior just as it does the powertrain and chassis. These technologies include: a GPS-linked, solar-sensing, dual-zone, dual-mode automatic climate control system; an Acura/BOSE® 10-speaker surround sound system with DVD-Audio 6-disc changer that provides 500 times the clarity of a typical CD system; MP3 and DTS capability; and standard XM® Satellite Radio.
Premium features continue in the form of Active Noise Cancellation™ (ANC) that neutralizes low-frequency noise in the interior along with Bluetooth® HandsFreeLink® which is a hands-free phone interface compatible with many Bluetooth® phones for a seamless cellular communication experience—in the car or away from it. Other technologies include a Multi-Information Display (MID), a Tire Pressure Monitoring System (TPMS) with specific tire and pressure indicators, and the Maintenance Minder™ system.
SAFETY
The RL earned the highest possible ratings (5-star) awarded during frontal (NCAP) and side (SINCAP) crash tests for outboard positions and rollover resistance tests conducted by the U.S. Department of Transportation's Highway Traffic Safety Administration (NHTSA). The RL is one of a select few vehicles in the history of the program to receive such high ratings in all three categories. The RL also earned a GOOD safety rating from the Insurance Institute of Highway Safety (IIHS) for frontal offset and side impact tests.
With the RL, Acura embraces active as well as passive safety as essential goals. Active safety features that can help a driver avoid an accident include SH-AWD™, Vehicle Stability AssistTM (VSA®) with traction control, and 4-wheel disc brakes. ABS and Brake Assist also help contribute to greater driver control. HID Xenon plasma-arc low-beam headlights and the available Active Front Lighting System (AFS) contribute to superior nighttime visibility.
One of the optional packages available for 2008, the RL Technology Package plus CMBS™ and PAX® Tires adds the Collision Mitigation Braking System™ (CMBS™), Adaptive Cruise Control and Michelin PAX® run-flat tires. Components of this package and are not available separately.
The RL also features Acura's innovative Advanced Compatibility Engineering™ (ACE™) body structure. ACE™ is designed to help dissipate collision forces in frontal crashes, while enhancing crash protection for occupants and passengers in other vehicles.
The RL features a driver and front passenger dual-stage, dual-threshold airbag Supplementary Restraint System (SRS). Side curtain airbags that provide head protection for all outboard seating positions are also standard equipment. The RL also has seat sensors that monitor the weight on the front passenger seat that will automatically turn off the passenger-side front side airbag if it detects an occupant who weighs less than 65 pounds.


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what's the point of making a thousand threads? It's the same car, isn't it?