Throttle Crack Lean The Rich

[dhegge]

Hi guys I have been trying to tune driveability on my SpeedPRO/FAST ECM. Everything is coming together nicely except when you first crack the throttle the motor goes lean 15:1 for a split second according to the logger and then it goes rich after that. and then it smooths back out.

I have tried turning the WB02 closed loop off to make sure that this is not effecting the engine. Any suggestions?

Thanks,
Doug

 

[TurboTR]

That's the definition of a tip in transient pretty much. Adjusting the AE v delta TPS will take care of it.

TurboTR

 

[Craig Smith]

It's almost unavoidable. As long as the motor revs OK when you whack the throttle you are OK. It's a huge, sudden change in airflow. I don't think it's possible to keep a steady a/f ratio under those conditions.