LS/Vtec Swap...suggestions? - Honda-Acura.net

tegbooster · 08-14-05, 03:15 PM

hey everyone,

I have a supercharged LS making abour 7-8lbs...i've read that i have to choose between the supercharger or the vtec because of compression issues with both. Is it possible to have a supercharged LS/Vtec without absolutely killing the motor? and if so...what extra mods would i put in to keep it normal. injectors, fuel pump, pistons, rods, valve springs etc etc?
thanks in advance for ur help

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LStegraTurbo · 08-14-05, 03:16 PM

whats does your car run now with just the supercharger, and bout how much was the kit to do it?

tegbooster · 08-14-05, 03:19 PM

i don't know yet...haven't had the time or money to get to a track or dyno...the kit was somewhere around 1400 installed...but it was a couple years ago...so it could be 100 less or more

**TheOtherDave™** · 08-14-05, 06:01 PM

In addition to the work required to fit a VTEC head onto your LS block, I'd upgrade the bottom end.

Specifically, I'd replace the factory rod bolts with ARP bolts, upgrade to the GSR oil pump and install the GSR's crankshaft main bearing girdle. All of these modifications will help maintain reliabilty at high-rpm use.

What will you use to manage the engine. You'll need a VTEC ECU to control the VTEC head, but if you're using an add-on computers to manage the supercharger and fuel enrichment, it may be easier to upgrade to programmable ECU (like AEM's EMS series, for example).

In terms of rough setup, I'd switch to the VTEC cams at around 4500K and to be super-conservative about engine longevity, I'd limit myself to about 7800 rpm, despite the rod bolt upgrade and bottom end reinforcements.

My 2.3¥

Feelsgr82bealiv · 08-20-05, 11:31 PM

Quote:

Originally Posted by TheOtherDave™

In addition to the work required to fit a VTEC head onto your LS block, I'd upgrade the bottom end.

Specifically, I'd replace the factory rod bolts with ARP bolts, upgrade to the GSR oil pump and install the GSR's crankshaft main bearing girdle. All of these modifications will help maintain reliabilty at high-rpm use.

What will you use to manage the engine. You'll need a VTEC ECU to control the VTEC head, but if you're using an add-on computers to manage the supercharger and fuel enrichment, it may be easier to upgrade to programmable ECU (like AEM's EMS series, for example).

In terms of rough setup, I'd switch to the VTEC cams at around 4500K and to be super-conservative about engine longevity, I'd limit myself to about 7800 rpm, despite the rod bolt upgrade and bottom end reinforcements.

My 2.3¥

Please tell me if the part about using the GSR's main bearing girdle is true.

tegbooster · 08-14-05, 06:59 PM

i would be switching to a vtec ECU definately, i have no additional add ons for boost control or fuel etc. do u suggest that i go with a virgin ECU and have it programmed or just go straight to a 1.8vtec ECU.

**TheOtherDave™** · 08-15-05, 01:21 PM

Quote:

Originally Posted by tegbooster

i would be switching to a vtec ECU definately, i have no additional add ons for boost control or fuel etc. do u suggest that i go with a virgin ECU and have it programmed or just go straight to a 1.8vtec ECU.

Then how the heck are you maintaining the correct air/fuel ratio?

Which supercharger are you running? JRSC?..

Don't tell me you're running an Ebay leaf blower...

To answer your question:
Chipping the stock ECU gets expensive very quickly. Plus you have the down-time while the ECU is out being re-chipped. A user-programmable ECU is much more flexible.

If your state allows the use of an aftermarket, programmable ECU (again, like the AEM EMS I mentioned earlier), then IMHO it is the best solution to manage your setup.

tegbooster · 08-19-05, 03:07 PM

it's a JRSC...and i do have the higher flowing fuel pump....but besides that....nothin

IntegraType-R · 08-20-05, 11:40 PM

What dave said is true.. but on some of the readouts.. you can possible make more power doing just ls/vtec.. rather then supercharged ls.. it'd be better anyway..

"In terms of rough setup, I'd switch to the VTEC cams at around 4500K and to be super-conservative about engine longevity, I'd limit myself to about 7800 rpm, despite the rod bolt upgrade and bottom end reinforcements."
-This is correct but building ls/vtec would require some internals to be worked do the fact the rod/piston ratio on vtec in a ls motor wouldn't work if you were to say use ls rods and gsr pistons or itr or ctr.. doesn't matter you would make more power and possible have longer life, make sure you save some money ont he side to upgrade your head studs and rod bolts.. THIS IS A MUST ON THIS SETUP..

"Specifically, I'd replace the factory rod bolts with ARP bolts, upgrade to the GSR oil pump and install the GSR's crankshaft main bearing girdle. All of these modifications will help maintain reliabilty at high-rpm use."
Stock ls/vtecs should have no problem reving out to about 8200k if your using a gsr head, b16 heads i wouldn't take pass 8000k, i'd suggest leaving the gsr oil pump stock no need to change that cause alot of people are still making 300+ whp on stock oil and water pumps.. it is a safety issuse but not a must.

"Then how the heck are you maintaining the correct air/fuel ratio?
Which supercharger are you running? JRSC?.."
JRSC makes a programmable ecu FMU..
Just switch heads and get the supercharger that bolts up to the vtec head if the ls one doesn't bolt up and get the JRSC FMU for the vtec and u'll be setup, its setup basically to run straight out the box.

Great info all around tho, that is my two cent.

tegbooster · 08-23-05, 08:09 PM

Quote:

Originally Posted by IntegraType-R

"i'd suggest leaving the gsr oil pump stock no need to change that

LS oil pump = GSR oil pump???...i don't think i've changed the oil pump....i got my head in today though...rental car tonight...starting work tomorrow...so...hows this for a rough list in parts:

1.8 vtec head *duh*
ARP bolts
Virgin ECU *or* GSR ECU
GSR crankshaft main barring girdle
Intake Manifold
Harness
???Distributor...or just cap???/Wires
timing belt
Fuel Rail/Injectors

from all the research this is what i've noticed..anyone got any other ideas...the final product won't be completed for another couple weeks due to $$ issues...but im starting tonight....anything i've missed (and/or) don't need......respond quick before i go on my little shopping spree around california

ACS S3 3.0 · 08-23-05, 08:37 PM

good luck with it.

08-14-05, 06:01 PM	#4
TheOtherDave™ Keeping the faith... Join Date: Nov 2002 Location: The Left Lane Posts: 52,876	In addition to the work required to fit a VTEC head onto your LS block, I'd upgrade the bottom end. Specifically, I'd replace the factory rod bolts with ARP bolts, upgrade to the GSR oil pump and install the GSR's crankshaft main bearing girdle. All of these modifications will help maintain reliabilty at high-rpm use. What will you use to manage the engine. You'll need a VTEC ECU to control the VTEC head, but if you're using an add-on computers to manage the supercharger and fuel enrichment, it may be easier to upgrade to programmable ECU (like AEM's EMS series, for example). In terms of rough setup, I'd switch to the VTEC cams at around 4500K and to be super-conservative about engine longevity, I'd limit myself to about 7800 rpm, despite the rod bolt upgrade and bottom end reinforcements. My 2.3¥ __________________ david :: supermoderator :: HAN Integra FAQ: Borderline antique, but still useful.

08-20-05, 11:40 PM	#9
IntegraType-R ALL MOTOR KING Join Date: Aug 2004 Location: Baton Rouge, Louisiana Posts: 369	What dave said is true.. but on some of the readouts.. you can possible make more power doing just ls/vtec.. rather then supercharged ls.. it'd be better anyway.. "In terms of rough setup, I'd switch to the VTEC cams at around 4500K and to be super-conservative about engine longevity, I'd limit myself to about 7800 rpm, despite the rod bolt upgrade and bottom end reinforcements." -This is correct but building ls/vtec would require some internals to be worked do the fact the rod/piston ratio on vtec in a ls motor wouldn't work if you were to say use ls rods and gsr pistons or itr or ctr.. doesn't matter you would make more power and possible have longer life, make sure you save some money ont he side to upgrade your head studs and rod bolts.. THIS IS A MUST ON THIS SETUP.. "Specifically, I'd replace the factory rod bolts with ARP bolts, upgrade to the GSR oil pump and install the GSR's crankshaft main bearing girdle. All of these modifications will help maintain reliabilty at high-rpm use." Stock ls/vtecs should have no problem reving out to about 8200k if your using a gsr head, b16 heads i wouldn't take pass 8000k, i'd suggest leaving the gsr oil pump stock no need to change that cause alot of people are still making 300+ whp on stock oil and water pumps.. it is a safety issuse but not a must. "Then how the heck are you maintaining the correct air/fuel ratio? Which supercharger are you running? JRSC?.." JRSC makes a programmable ecu FMU.. Just switch heads and get the supercharger that bolts up to the vtec head if the ls one doesn't bolt up and get the JRSC FMU for the vtec and u'll be setup, its setup basically to run straight out the box. Great info all around tho, that is my two cent. __________________ InnovativeMotorWorks \|DFE Enterprises \|Rocket MotorSports\|cccylinderheads.com eCtune PRO,NeptuneRTP & CromePRO Tuner / Supporter - Contact me for details.

08-23-05, 08:37 PM	#11
ACS S3 3.0 Honda Two Thhhhousand Join Date: Jun 2005 Posts: 2,199	good luck with it. __________________ HID's For Sale http://www.honda-acura.net/forums/sh...d.php?t=271248

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08-14-05, 03:16 PM	#2
LStegraTurbo Registered User Join Date: Aug 2005 Posts: 12	whats does your car run now with just the supercharger, and bout how much was the kit to do it?

08-14-05, 03:19 PM	#3
tegbooster Resident Ninja-photo'er Join Date: Aug 2005 Location: Anaheim, CA Posts: 3,964	i don't know yet...haven't had the time or money to get to a track or dyno...the kit was somewhere around 1400 installed...but it was a couple years ago...so it could be 100 less or more

08-14-05, 06:59 PM	#6
tegbooster Resident Ninja-photo'er Join Date: Aug 2005 Location: Anaheim, CA Posts: 3,964	i would be switching to a vtec ECU definately, i have no additional add ons for boost control or fuel etc. do u suggest that i go with a virgin ECU and have it programmed or just go straight to a 1.8vtec ECU.

08-19-05, 03:07 PM	#8
tegbooster Resident Ninja-photo'er Join Date: Aug 2005 Location: Anaheim, CA Posts: 3,964	it's a JRSC...and i do have the higher flowing fuel pump....but besides that....nothin