how do you set fuel when the cam is set to 25

packrat555 · Post by **packrat555** » Sun Nov 28, 2010 2:20 pm

when the high speed cam is set to 25 how do you set the fuel. Does it average the 20 and 30 cam setting table values?

I guess I am taking the lazy way out and only tweaking fuel for actual situations that will exist and the calibration I started with has the high speed cam set to 25 above 7400 rpm.

I suppose I could set the fuel on both the 20 and 30 high speed cam to the same value while tweaking to get the a/f to 13.2

Floppie · Post by **Floppie** » Sun Nov 28, 2010 9:24 pm

Tune 20 and tune 30. It won't take much longer than tuning one or the other, then the ECU will average them for 25.

This is desirable compared to simply setting both to the same value to tune 25 because the VTC system isn't perfect. It's hydraulic - jitter is inherent. If it jumps one way or the other you could end up rich or (more dangerously) lean.