Quote:
Originally Posted by JohnnyGrey
The IAT is flat-out ignored in closed loop mode. Your scangauge will show improvement because IAT is part of the formula it uses to compute fuel usage, but when you go to fill up, you'll realize that you've burned more fuel than it thinks you did and that there was no improvement.
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The fuel mass is computed from the air mass, of which iat is a correction factor. In closed loop the fuel mass is calculated from the input of various sensors, and is corrected from the output of the ho2s. Ever heard of fuel trim?
Where did you get that iat is part of the formula the sg uses to compute fuel usage? I never read that anywhere.
And even if you don't touch the ho2s and do the iats resistor mod, you still retain the timing advantage given by the mod.