Quote:
Originally Posted by Fast_Freddy
You certainly did nothing wrong. Flames follow me in this thread like car-b-q's follow amateur automotive electrical mods. 
I wish I could be more help with the lean low-rpm AFR condition. I have seen the same thing on most ESC AFR plots and many turbo apps. It's hard to avoid going lean when the boost suddenly kicks in while the ECU is still in closed loop. IMO a good tuning strategy would be a custom map (Ecutek) that dumps extra fuel based on MAP. Shiv might be able to do something similar using load. I accomplished the same using a MAP-activated AFR enrichment module on my last turbo car. Whenever boost was present the module made the AFR sensor read lean which made the ECU add fuel so that even in closed loop I could get an AFR of 12:1. But I was limited by having a locked Toyota ECU and you are not. I'm sure that a "flash" tuning solution exists for you.
Thank you for your kind offer. I may actually take you up on it. |
It's actually the transition between CL to OL. One way to get around it is targeting richer on both side of the transition.
Run full time close loop will work as well but needs wideband and ecutek atm, and speed density/boost based fueling could work also.