YoungGun
Enthusiast
Could some just give me a quick Answer about airfuel. What do most of the Gen 1st run a/f wise. on a stock car?
I quick Question on A/F?
- Thread starter YoungGun
- Start date
YoungGun
Enthusiast
aww I see. thanks alot I use to looking a srt4 turbo stuff where we run around 11.5 at highest. so it seemed lean to me. thanks for clearing that up!
DEVILDOG
VCA Member North TX
Joseph Dell
Enthusiast
14.7 is Naturally aspirated. 11.5 is a target AF for supercharged cars. 10.5 for Nitrous... and differnt for turbos and water/**** and race gas, etc...
Joseph Dell
Enthusiast
14.7 then.
99 R/T 10
Enthusiast
On my stock Gen I, the A/F was a constant 13.0.
YoungGun
Enthusiast
ok I guess my car goes rich then in drops down to around 12.5 or so.
Youngun:
Lets clarify the a/f discussion. If you are in closed loop (partial throtle) the PCM tries to keep the car at 14.7. It has to be that way since the narrow band O2 sensors can only keep the car at or near 14.7, they don't work any other way.
Item 2, during WOT, most (not all) stock vipers have a common a/f plot. That plot is extremely lean 14-15 up to about 3750 rpm. After 4000 rpm the plot starts getting richer and in most cases ends up about 12.5, which is rich for an NA car above 5000 rpm.
Normally with a stock NA car you would try to achieve 12.5 to 12.8 before peak torque and go for 12/8 to 13.1 above peak torque. Peak torque on a stock car is about 3800.
Lets clarify the a/f discussion. If you are in closed loop (partial throtle) the PCM tries to keep the car at 14.7. It has to be that way since the narrow band O2 sensors can only keep the car at or near 14.7, they don't work any other way.
Item 2, during WOT, most (not all) stock vipers have a common a/f plot. That plot is extremely lean 14-15 up to about 3750 rpm. After 4000 rpm the plot starts getting richer and in most cases ends up about 12.5, which is rich for an NA car above 5000 rpm.
Normally with a stock NA car you would try to achieve 12.5 to 12.8 before peak torque and go for 12/8 to 13.1 above peak torque. Peak torque on a stock car is about 3800.
