Port matching
Thread Starter
Member
Joined: Aug 2013
Posts: 33
Likes: 0
From: Alabama
Port matching
Ok gentlemen, huge question...
How bad is a larger throttle body (in comparison to the intake mani) WITHOUT PORT MATCHING? I know it'll affect the flow of air, BUT will it affect the throttle body functioning correctly altogether? for example, idling properly/map sensor making correct readings/anything dealing with the holes and inner grooves on a throttle body. Will those holes possibly be blocked off with a smaller intake mani?
-68 mm blox tb
-skunk2 intake mani
-d16y8 engine
PLEASE HELP
How bad is a larger throttle body (in comparison to the intake mani) WITHOUT PORT MATCHING? I know it'll affect the flow of air, BUT will it affect the throttle body functioning correctly altogether? for example, idling properly/map sensor making correct readings/anything dealing with the holes and inner grooves on a throttle body. Will those holes possibly be blocked off with a smaller intake mani?
-68 mm blox tb
-skunk2 intake mani
-d16y8 engine
PLEASE HELP
Senior Member
Joined: Dec 2004
Posts: 355
Likes: 0
From: San Jose, CA
The ECU makes assumptions based on the car's original equipment.
Changing from a 62mm to a 68mm throttle body increases the amount of air that can be supplied to the intake manifold by 20.3% (3019.1mm^2 to 3631.7mm^2) which might be changing the fuel-to-air ratio.
(or it could be a vacuum leak.)
This is the reason tuners have programmable ROMs in their car's ECUs and do dyno work to map the fuel-to-air ratios correctly for their modified engines.
A couple of other things to do _before_ you heavily modify your car's engine/horse power(HP):
-upgrade the car's suspension to handle the additional HP
-take a real road track training class (more HP means you can/will get in trouble _much faster_ than you did with an OEM car.)
Changing from a 62mm to a 68mm throttle body increases the amount of air that can be supplied to the intake manifold by 20.3% (3019.1mm^2 to 3631.7mm^2) which might be changing the fuel-to-air ratio.
(or it could be a vacuum leak.)
This is the reason tuners have programmable ROMs in their car's ECUs and do dyno work to map the fuel-to-air ratios correctly for their modified engines.
A couple of other things to do _before_ you heavily modify your car's engine/horse power(HP):
-upgrade the car's suspension to handle the additional HP
-take a real road track training class (more HP means you can/will get in trouble _much faster_ than you did with an OEM car.)
Thread Starter
Member
Joined: Aug 2013
Posts: 33
Likes: 0
From: Alabama
ahhhh, u know that could be it. I do have a hondata s100 on this vehicle, but it hasn't been tuned in a while. also, I do have skunk2 suspension on here as well, along with the whole front end of it upgraded with polyurethane bushings. ill look into the ecu thing. thanx!