Ltft & stft

[Watazz]

Okay so I am assuming that is is not okay for my LTFT and my STFT to be like -9. Anyone know why this is happening? Also have a very lean warm startup any ideas?

[Watazz]

Re: Ltft & stft

from a few things Ive read its okay as long as my AFR is cool under WOT. But I still have a startup AFR problem and I still continue to run either full lean or full rich under cruise. I will replace the header gaskets soon to rule that out as I seem to have an exhaust "flutter".

[bigairboarder44]

Re: Ltft & stft

When's the last time you tuned your LTFT's and STFT's? I'm definitely no expert (starting to get my feet wet), but -9 doesn't seem that bad. After you're tuned, you want them to be between -4 and 0 I believe.

For some reason, I was thinking negative numbers were rich and positives were lean. My incorrectness would explain the incredibly high positive numbers because I am running super rich... Thanks!

[ssms5411]

Re: Ltft & stft

Anywhere between -4 and +4 is good for lifts, short term lifts I never mess with because once the long term lifts are good they ususally follow, but your correct -4 woulb be adding and +4 is the car running too lean. Thats how I usually have gone by. I have done my lifts by using the injector table getting the values as close together and then it will get your lifts closer to 0. Btw -9 isn't that bad.

[Watazz]

Re: Ltft & stft

So I should try and get my injector numbers as close together as possible. Its just weird because that car isnt runing lean. Under WOT its perfect.

[ssms5411]

Re: Ltft & stft

Whats your injector table look like?

[Watazz]

Re: Ltft & stft

scaled from 33 to 34

[Watazz]

Re: Ltft & stft

32.99937 33.15925 33.32069 33.45787 33.57883 33.67884 33.77945 33.85861 33.92044 33.96917 34.00026

I also changed the VE table around a bit. Im begining to think it did more harm than good. Saw -14 in LTFT today.

[ssms5411]

Re: Ltft & stft

33.00 33.13 33.26 33.19 33.42 33.55 33.68 33.81 33.94 34.07 34.20

Yes , I would try it closer like above

[Watazz]

Re: Ltft & stft

gotcha. Ill try that steve. thanks

[Watazz]

Re: Ltft & stft

So I made my injector table a little closer together and my wideband doesnt seem to jump around as much, I also went back to the stock Main VE. Ive noticed that LTFT doesnt drop down until after WOT (-12_-18) under WOT LTFT is -6_-9 and STFT is 0.

[Watazz]

Re: Ltft & stft

ALL trims are looking much better. I set all the injector values the same and reset the fuel trims. I rarely see them skew away from 0 under WOT and they dont drop down as much durring deceleration.