I'm having trouble diagnosing a datalog and my engine missing at roughly 4800rpm.
At high RPM (WOT and CL) the engine stops making power at 4800rpm and falls to around 4000rpm before building to 4800rpm and repeating the cycle.
At these specific times the datalog column of "FUEL_IN_SYNC" stops reading "sequential fire" and is blank for a few sample Counts
Datalog column FUELPW1 also increases by a factor of three occasionally when this issues happens
Any suggestions on what to look at? Is it tune related? I swapped out the distributor today (different TFI and pip) and had similar results. Car is also supercharged.
Let this be a lesson to anyone who has been copy and pasting their tunes on each A9L2 update over the years. I think my base tune is from a 2016 version of A9L2 and I've been casually copying and pasting my tune until now when updates are released. It finally bit me when I did a deep dive on the latest A9L2 to look at what was different and If I had missed something or accidently setup anything wrong.
Turns out on a few of my latest tunes the "Perload Switch - PRLDSW" was incorrectly checked/selected. I'm not sure when I accidently checked it, but when the car hit boost and load = 100% bad things were starting to happen, now that load is being correctly calculated as load/peak load the car runs great.
edit: i also found that the two step RPM was set at 4875 and raised it to the latest values i saw in the current A9L2.