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Heatsoak
When my 2011 335i sedan was new and just broken in I ran it on Nurburgring Nordschleife for a few laps. The ambient temperature there was cooler than your run, but after only one 22 km lap the intercooler was heatsoaked, meaning that the intercooler was so overtaxed by all of the full throttle running that the intercooler outlet air temperature was too high and the engine power was sharply reduced.
This is a phenomenon that I have never noticed in street driving of my BMW, even during hard street driving. My conclusion is that if I ever wanted to run the BMW on the track it would need a larger intercooler than the OEM design. Those are available. From your experience it sounds like we will also need a larger engine oil cooler to run at a lot of US tracks. Mine is a daily driver, so I don't care.
BTW, I used to have a Porsche 944 Turbo and that car was delivered with a sufficiently large intercooler that I could run it on the track all day long without these problems.
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