NEED HELP ON LTFT & STFT!!!!

[redgst95]

Can anybody help me out on these fuel tims where might a good thread be on how to tune! I've tried searching for it but come up with not enough info on it any kind of help would be nice thanks in advance!!!!!

 

[RossY]

What is it you would like to know about them. I've never really bothered or know much about STFT. I believe that it doesn't even really apply to 2g's. The main thing you want to focus on is the LTFT. Basically you want to get the % as close to zero as you can.

If the LTFT is positive that means the ecu is adding fuel. If its negative, the ecu is taking out fuel.

To change the value you need to let your car warm up and let it idle for about five mins. Then, get the LTFT as close to zero as possible by changing the global fuel value. A general way to guess what the global setting should be is as follows.

this assumes 720cc injectors...Input your injector size in the bold
Adjustment = 450 / 720 – 1.0 = 0.625 – 1.0 = -0.375 or –37.5%

Then you need to take it on a highway cruise and check your high trim.

If the LTFT number at idle is not the same as the number at cruise, then you need to change the dead time on the injectors. If the idle LTFT is higher than cruise LTFT you should increase the dead time and vice versa.

Hope that helps you.