[Camaro1973]

Originally Posted by StanZL1

Need some help from the crowd.
Drives fine on street/highway.

Tracking at Mid-Ohio and the car is pulling power at it gets hot.
Full stock. 24k miles. About 2k miles of hard track use over past 2 years.
Minor note that race rims don't have tpms, never been an issue and set great lap times at other tracks in 2019 and 2020.

Shifts normally. Track Sport1 for the day since Mid-Ohio is a slick track and my 2nd time here.

Building power takes longer and longer in each successive straight.‘Sounds like’ timing retarding, but confirmed the blower coolant circuit is full (dealership specifically bled it before track) because I had that power pulling issue 3 months ago at Grattan Raceway. Slow power build to a point and then zero power as if no pedal control. Could possibly be more of the same, but now theres a different heat soak (?) symptom (rather than cutting all throttle response…)

Now it appears to hit a point in every long hard accel at wide open throttle around 5200rpm, the ECM takes over and begins oscillating the throttle… which sawtooths power even slower up to shift point. Friend got a logger and confirmed WOT pedal input, good fuel pressure, and the ECU is taking over controlling the car (some protective loop). Haven’t figured out yet “what” sensor or condition is causing the ECU to cut & give throttle over and over (every straight) until it cools down (in the brake zone & corner esses) and returns to driving like normal.

Drives on pits/street/highway just fine when cool.
Zero codes stored.

Dealership visit tomorrow.

Best to log it and see for yourself. But. on a stock tune at 56C/132F timing can start to be pulled for high air temps and at 194F ECT table can start pulling timing as well. Only way to check is to have a gauge or log it.