I have a noticeable power loss on my V8 that I can not only feel in the seat of my pants, but the track-day telemetry clearly shows the reduction in acceleration.
My boost looks great and intake temperatures look perfect, and I have no codes or CEL. The performance drop feels like a lack of ignition advance and as the RPMs increase the power peeters out (just like you'd get with lack of ignition advance).
In addition, the telemetry I collect from the OBD-II port looks really strange and I have never seen this before. During high-demand periods, the ECU is no longer providing query data and there will be a stretch of 10 seconds at a time (on the front and back straightaway) where the ECU isn't providing any data samples at all. It's as if the ECU is too busy with something to respond to polling requests.
So, is this symptomatic of something the group is familiar with? Do I have a cam sensor flaking out resulting in the ECU doing double-time trying to maintain timing with skipped pulses or whatever and since its flaking out I'm getting crappy ignition timing and lack of advance? Any other ideas?