Long term fuel trim....
Thread Starter
Le Mans Master
Joined: Oct 2001
Posts: 5,577
Likes: 3
From: Southern Maryland Maryland
Long term fuel trim....
I just checked my car with a scanner and my long term fuel trims are -(10-11). What do I need to do with LS1 edit and how much is this hurting performance?
Phillip
Phillip
Heel & Toe
Joined: Oct 2002
Posts: 16
Likes: 0
From: Newport Mi.
Re: Long term fuel trim.... (Phil97SVT)
Having the LTFTs at -10% or -11% is not causing any performance loss, and you will not tune the PCM to yeild more HP based on the negative LTFT value.
You want the LTFTs to be slightly negative, such as, -5% to 0%, but being at -10% is of no concern. You could modify the MAF table with LS1Edit and lower all the the MAF table values by 5% (multiply thru by 95%), but you will not increase the HP. You might end up at about -3% LTFT but no HP increase.
You are at the point where you can now tune for WOT with a wide band O2 sensor.
You want the LTFTs to be slightly negative, such as, -5% to 0%, but being at -10% is of no concern. You could modify the MAF table with LS1Edit and lower all the the MAF table values by 5% (multiply thru by 95%), but you will not increase the HP. You might end up at about -3% LTFT but no HP increase.
You are at the point where you can now tune for WOT with a wide band O2 sensor.
Le Mans Master
Joined: Jul 2000
Posts: 7,758
Likes: 0
From: Fort Worth Texas
Cruise-In II Veteran
Cruise-In III Veteran
Re: Long term fuel trim.... (Doc99SS)
Having the LTFTs at -10% or -11% is not causing any performance loss, and you will not tune the PCM to yeild more HP based on the negative LTFT value.
You want the LTFTs to be slightly negative, such as, -5% to 0%, but being at -10% is of no concern. You could modify the MAF table with LS1Edit and lower all the the MAF table values by 5% (multiply thru by 95%), but you will not increase the HP. You might end up at about -3% LTFT but no HP increase.
You are at the point where you can now tune for WOT with a wide band O2 sensor.
You want the LTFTs to be slightly negative, such as, -5% to 0%, but being at -10% is of no concern. You could modify the MAF table with LS1Edit and lower all the the MAF table values by 5% (multiply thru by 95%), but you will not increase the HP. You might end up at about -3% LTFT but no HP increase.
You are at the point where you can now tune for WOT with a wide band O2 sensor.
[Modified by kewlbrz, 11:54 PM 12/4/2002]
