[quote author=GT1 link=topic=134342.msg2890691#msg2890691 date=1232957347]
[quote author=qwerty4550 link=topic=134342.msg2889845#msg2889845 date=1232932296]
[quote author=the_caruch link=topic=134342.msg2889767#msg2889767 date=1232927931]
[quote author=qwerty4550 link=topic=134342.msg2889411#msg2889411 date=1232912075]
So what are acceptable ltft at idle and WOT? I am pretty sure my idle is around -6%, but not sure about WOT. I will do a datalog and check the next chance I get.
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0% for WOT is what you want, but without a tuner it's probably going to be +/-2-4%
Being a percent or 2 rich isn't too bad at WOT. You definitely don't want to be too lean at WOT though.
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So when you are in the negative you are running rich, and when you are in the positive you are running lean, correct?
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No. LTFT does not tell you anything about the actual fuel mixture (i.e. running lean/rich).
Rather, it is the amount of correction applied by the ECU in order to achieve the target fuel mixture for the current conditions.
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So at WOT, if you have a tune you should be very close to 0 correct? However, without a tune (me) what are acceptable numbers? Also, what is the difference between STFT (short-term fuel trims?) & LTFT (long-term fuel trims)? Does LTFT avg every value it has received per cycle, while STFT just gives the actual value at that point (- refresh times)? Sorry for all of the noob questions, but I would like to know what I am actually reading with my DH :lol: .
Also, I know this is off-topic, but is there a way to log something on the DH to show if I need to tighten or loosen the screw on my BOV/BPV? I would rather use values over just listening with my ears.