Quote:
Originally Posted by Spuds
That's pretty good by my account. I think the temperature correction factors are a bit off on the OEM tune for some reason, so my winter ltfts are negative and summer is positive. I don't think anyone actually messes with temp correction. Colorado is likely a bit colder and dryer than Florida being my point.
Stft will vary quite a bit. Every squirt of gas is a bit different so it takes into account very short term (like 2-4 revolutions) trends and adapts immediately. I don't think twice about anything less than +-15 on these.
Ltft stores longer term trends based on stft. I'm usually ok with +-5 on these. Some people are more picky. Your ltft looks like it might decrease to about -5 or -6 all things being equal, based on your stft range.
Don't worry about idle and low rpms unless they get real bad(10+%).
I'd wait for temperatures to get into the 60 or 70s then see how it looks. If they get below -10, then you should start looking for a solution IMO.
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Good information. For the future, what would most likely be the cause of really low fuel trims (like -20s or less)? I have read that if they're really high it can be an exhaust leak.
Also, how should my STs and LTs fluctuate when I'm have a bigger percent throttle. I haven't looked at them while doing a pull.