I've seen REP now with two Vette's, both very powerful and having problems with Reduced Engine Power when the traction is suddenly lost. No problems in dyno at WOT though.
This particular car is a C5 Vette with forged 427, ported LS3 heads, YSi, around 17 lbs boost, 22x/24x cam, early LS3 TB and so on.
I've tried to get rid of all items that would lead to a REP. Tune is 50% scaled and (I hope) usual suspects have been maxed or eliminated.
Attached is a log where the traction is suddenly lost between frames 443-453. Based on the feedback from the driver of the car, roughly at the same time, P1515 is activated (Electronic Throttle System Throttle Position).
In the log at frame 448 you can see how the injector duty and apperently also injector opening time suddenly go very low, AFR goes up but still at the same time, EQ ratio stays at 1.27 (and commanded AFR does not change either), which I think indicates that the PCM goes into some kind of error mode - probably because of P1515.
Any opinions?