I have a strange problem with fuel trims.
I will start the vehicle (2012 Challenger RT 426 w/Whipple 2.9, Manual 6 speed) as the vehicle warms up the left bank (bank 1) ST fuel trims go negative and will max out at -32.8% and at the same time the right bank (bank 2) ST fuel trims will go positive and will max out at 32.8% , if you let the car continue to idle the LT fuel trims on bank 1 will max out negative (-32.8%), LT fuel trims on bank 2 will max out positive (32.8%) and the the engine will die/stop running.
A little bit of back story that might help. Over the winter I changed valve springs and removed the headers to re-wrap them with heat wrap and reinstalled them. I don't hear any exhaust leaks and I don't have any valve train issues.
This past weekend I went to the track. I ran three or four passes to get the fueling dialed in because it was very warm in Florida this past weekend and toward the end of last season it was very cold where I was racing so the fueling need to be adjusted. On the 5th run, all was working well. The supercharger belt broke (I have separate belts for the SC and accessories) at the end of the run. I turned off the track onto the the return lane and that's when all this mess started.
The car would not start until it cooled off - once it started this craziness with bank 1 trying to trim full negative and bank 2 trying to trim full positive started.
I switched ECUs, I switched Throttle bodies, I changed 02 sensors, I changed tunes..... nothing makes a difference.
I am at a loss.
attached is a screen shot of the most recent log idling in my driveway this morning along with the tune.
23-03-31 14-05-09.hplFull Rich and Full Lean.jpg8.12.20-OST-93oct-r6-3bar - read from ECU - with Injector PW data changes.hpt