Apexi

I've been spending some time studying dyno sheets and am wondering the following:

I've noticed my air/fuel in the lower RPM range on the primary turbo is pig rich, right off the scale. Since the HP curves are fairly consistent in pattern, I'm wondering would removing some fuel down low to create more power on the primary, theoretically result in an upward shift in the entire HP curve to also make more power up top?

Anybody have factual experience with this?

Marshall

Typically its leaner, where are you seeing this?

Apexi

typically it's leaner? Is this factual info? I've recvd some feedback from the big list saying that others have noticed that their ECUs from aftermarket tuners like M2, KDR, SRM, RP all do the same thing. That down low it's programmed pig rich for some reason??

kkekeisen

Most engines that pop go at "tip in" when the person is just starting to get into the throttle and the ecu can't compensate quickly enough. The aftermarket ecu's are most likely just trying to keep it rich enough to be safe.

kyle

Apexi

Thanks for the info. This is what I've also been hearing from the Big List. I've always thought that most engines pop when running lean near redline, but apparently people say detonation is most likely to occur in the lower RPMs when you're just getting on the gas? Interesting...

twokrx7

iTrader: (1)

Funny, I thought most engines pop at or near peak torque.