LTFT Question
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LTFT Question
I am pulling LTFT of around 10 in a cruise and idle situation. Car has headers, Borla and BW.
Could a BW and a set of headers cause the car to go this lean?
FWIW, I have no exhaust leaks. Took care of those today. The LTFT's were up around 18-25 before with the leaks.
Any help would be appreciated. :banghead:
[Modified by Chalky'sC5, 2:59 PM 9/2/2003]
Could a BW and a set of headers cause the car to go this lean?
FWIW, I have no exhaust leaks. Took care of those today. The LTFT's were up around 18-25 before with the leaks.
Any help would be appreciated. :banghead:
[Modified by Chalky'sC5, 2:59 PM 9/2/2003]
Drifting
Joined: Sep 1999
Posts: 1,908
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From: Manassas, VA, USA
Re: LTFT Question (Chalky'sC5)
10 is within the acceptable range. And since you installed headers and BW, you're getting more airflow. The LTFT is adding more fuel to "compensate" for that. IOW, sounds normal to me. :cheers:
Safety Car
Joined: Dec 1999
Posts: 4,202
Likes: 2
From: Plano TX
Re: LTFT Question (Chalky'sC5)
Yes, those changes will make you lean. The car is already that way to begin with.
Since you have a way to measure LTFT, do you also have LS1Edit? Without the ability to change, you are wasting time.
The positive LTFT means the PCM is compensating by adding fuel during part throttle. That extra fuel, carries in to wide open throttle situations and contributes to a too rich condition that robs you of power.
Have you been on a dyno, with a wideband?
Since you have a way to measure LTFT, do you also have LS1Edit? Without the ability to change, you are wasting time.
The positive LTFT means the PCM is compensating by adding fuel during part throttle. That extra fuel, carries in to wide open throttle situations and contributes to a too rich condition that robs you of power.
Have you been on a dyno, with a wideband?
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Posts: n/a
Re: LTFT Question (TooManyIDs)
No Dyno or wideband. Car originally tghrough a P0171 code, lean right bank. I had Predator so I checked and the right bank was running upwards up 25 on LTFT. I changed collector gaskets and both banks came back to 8-10 LTFT.
I recently received a modified performance file From Preadator. LTFT are right @ 0 now and car seems to run very well now.
I recently received a modified performance file From Preadator. LTFT are right @ 0 now and car seems to run very well now.
