on the apexi site, it says that 12-14%+ will sometimes induce a check engine lite, due to the map sensor voltage being so low (as if it sees boost, the afc manipulates the map sensor signal and fools it inot thinking more air is going thru than what is really going thru, so in turn, more fueling occurs)...well, my car, sometimes, will throw a lite it seems from it being set at 11%+.... I think it mite be from that fact that my car sees a little bit of positve manifold pressure at full throttle; the afc will show .01-.02..where as most NA hondas it seems at full throttle show .00..my theory is, my high compression, big cam, porting, etc make the map sensor voltage that much lower at full throttle than most hondas due to the increased air being pulled in, so the lite being thrown @ 11% makes sense.

Do you agree?

 

?!

 

yeah, it makes sense to me.

on a stock engine even at WOT there will still be a little vacuum in the manifold... modifying it for higher airflow would get you closer to zero vacuum in the manifold at WOT, therefore the same amount of correction with an AFC would put what the ECU sees at a little higher than with a totally stock engine.

 

Thanks!

Turns out it does it @ 10%, but not 9%...strange how it jsut started to be so sensitive to this, who knows.