I am calibrating a 2018 Trackhawk with flex fuel OS. Dyno session has been going fine so far on gasoline but as soon as I introduced ethanol it has been running very rough. I can see the target lambda is 1.0 but O2 sensors are reading ~1.3 (I have also verified this with the dyno's wideband). The fuel trims are only roughly +5-10% as if the ECM is adjusting to an incorrect Air/Fuel. Also worth noting on startup it runs "ok" (just slight idle fluctuation) for a few seconds then just dies. I have attached a couple logs and the currently flashed calibration. What am I missing here? I have compared to other Hellcats/Trackhawk flex tunes and nothing sticks out. Any help is greatly appreciated.
6_flexfuel.hpt
3_startup_dies.hpl
4_partthrottle_lean.hpl
Thanks so much!
Eric