2008 Charger SRT8 with Procharger / goes lean after a dyno pull

Hey Guys I'm experiencing an odd issue and wondering if anybody else has come across this. The car is a 2008 Charger SRT8 with a procharger. I dialed in the tune pretty good and the trims are within 10% however after a do a full throttle dyno pull and the car returns back to idle the fuel trims go crazy high to around +38% at idle and cruising. If I shut the car off and start it again the trims are once again fine and start to correct back and are within 10% again. The car is equip with a wideband gauge and it is closed looping to the proper AFR of 14.7 when it does this. Also after the dyno pull when the lean condition occurs the trans seems a little sluggish during the gear changes as well. Could this be some type of limp mode that is occurring? I've attached a copy of the tune file as well as 2 datalog files. The Lean Condition datalog is how the car behaves after a dyno pull and the Normal Condition Datalog is after turning the car off and then on again.

Any insight to this would be greatly appreciated.

Thanks
Shawn

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Originally Posted by Musky@RG

Hey Guys I'm experiencing an odd issue and wondering if anybody else has come across this. The car is a 2008 Charger SRT8 with a procharger. I dialed in the tune pretty good and the trims are within 10% however after a do a full throttle dyno pull and the car returns back to idle the fuel trims go crazy high to around +38% at idle and cruising. If I shut the car off and start it again the trims are once again fine and start to correct back and are within 10% again. The car is equip with a wideband gauge and it is closed looping to the proper AFR of 14.7 when it does this. Also after the dyno pull when the lean condition occurs the trans seems a little sluggish during the gear changes as well. Could this be some type of limp mode that is occurring? I've attached a copy of the tune file as well as 2 datalog files. The Lean Condition datalog is how the car behaves after a dyno pull and the Normal Condition Datalog is after turning the car off and then on again.

Any insight to this would be greatly appreciated.

Thanks
Shawn

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Did you try setting (enable ECT) to 376 ([ECM] 44499 - Minimum ECT to Allow DFCO: Above this ECT, DFCO will be allowed.)so it doesn't kick in on decel and see what happens. Just a guess on my part.

i have a whipple and had this same issue and it was the correction factor for iat temperatures. when the car was started cold and run for a while it was fine but if i shut it off and restarted it after a few min it would be a little heatsoaked and the fuel trims would go from -5 to + 15 just like that so id check that area under airflow, speed density, corrections