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My Dakota would slow down by 2 full tenths if I let the factory PCM "learn" while idling up the return road. It trimmed the multiplier - that also affected WOT operation. So every time I was in the staging lanes - I'd reset the PCM and let it start fresh. I finally just "forced" it to stay in open loop by unplugging the factory O2 sensors when I was at the track. It was very hard to go rounds with it slowing down every pass!



You really can't use OEM ECUs for racing unless you can get into the program and change the target A/F ratios and the strategy whose objective was related to the control of emissions, not WOT operation. GM guys can do this easily, but not so easy with Mopar ECUs. I have done it but it wasn't easy nor legal for street operation. If you are in a state that does not have strict emission laws the way to go is with an aftermarket ECU that you can tune.