saabman wrote:I am still confused, it doesnt spoof the ECU about air?? Typically piggy backs scale the air value down on the way to the ECU and scale the fuel up on the way out of the ECU. Is this what yours is doing?
We talked through this and other stuff on the phone (thanks, Chris) but the reason I don't do sensor scaling is that scaling the air value changes both fueling and ignition timing at the same time, and the resulting output (at least with different sized injectors) is unlikely to be able to be correct on both parameters at the same map point for sensor signal mod.
Instead, I apply a percentage duty cycle trim to injector outputs from the stock ECU, and an offset to the spark signal output that is positive or negative measured in degrees.