Probably a redundant question and yes I used the mighty search button and read a bagillion posts...

Is it possible to tune with a stock ECU with Stillen piggy back?

Thanks

 

Why.

 

Long story and I will be happy to give the history if you want... send me a PM with your email.

End result is under load with WOT my AF is dropping below 11 to 1. Ran a lot harder when it was low 12.* int he same situation.

 

Did you have the A/F confirmed on a Dyno ? If its just your gauge that shows you are richer...it maybe the gauge is off

Its also possible that your boost is less or more , putting your tune in a different area of the R4 fuel map

 

That makes sense... dyno pull is coming up very soon.

I had the ECU reflashed by ultimatez via the dealership that built it... with the reflash it basically took a step backwards in performance at the top end... and thats why I am drawing the corellation between the gauge reading and the tuning question... I also lost half to a pound of boost with the flash.

I since have had a stock ecu put in for various reasons and do not believe I have put enough time on it for it to fully re-learn... but it currently is dropping to the high 11.*s so we'll see after its caught up.

My initial question is still applicable just for my knowledge... are there tuning capabilities with a stock ecu and a stillen piggy back?