Hi a friend of mine has built DPI custom setup with progressive controller
Seperate fuel supply (low pressure 5 psi)
250 kit installed, and whatever we do it runs VERY rich, (we have not gone past 60% duty cycle yet)
So we changed the NOS jetting up one size (28 to 32), still rich as a PIG

We monitor A/F on wideband O2 sensor on Dynojet, we have individual EGT on cylinder and of course Ease Scanner during our runs, so we are pretty sure everything is ok

Q
Is it safe to go another size up on the NOS side ? to lean it out ?


TIA


BTW
Wideband O2 sensor is brand new, on every pull we do it will dip low (lower than 10:1), then around 5000 RPM`s it will shoot up , straight to 18:1
This is Odd, because A/F is nowhere near 18:1 the last 1200 RPM`s, engine would blow up
Anyone seen this before

 

Try spraying it with out the progressive and see what the air fuel does. It almost sounds like the progressive is only controling the N2O solenoid.

 

Thanks, we will do that eventually when we feel confident that everything is ok, a bit scary to go 250 kit :-)
Controller should control all four solenoids, we have ground from all four grounded through the controller.

Does A/F show correctly when using NOS ?