I posted this elsewhere. This was the white car damaged at the track two weeks ago. If you look closely at the car is also shows evidence of fire below the LHS rear tail light. It seems coincidental?
I understand there is also a LO car that has been affected the same way at the track. That is three cars. Small sample.
My thoughts are that this is an issue with some internal rubbing of the rear tyre. A number of owners have already stated that there is already rubbing here on small compressions. The factory themselves conceed that the liners are now a "wear item". I wonder if repeated compressions at the track have caused the tyre to rub through an oil line and create a fire. If so this should be easily remedied.
I do not believe this has anything to do with the engine internals. They have already reduced the redline to 8600 (auto), 8800 (manual) on this car and beefed up the crankshaft etc. The engine has the benefit of the GT3 engine learning. Those were run to their death during the stop sale for testing. I have ZERO doubts that the GT3RS engine is not race ready strong. I think what we are looking at here is some issue with squeezing those tyres so tight under those rear arches...
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2014 991 GT3, 1994 993C2 6spd RS spec, 2016 Cayman GT4 (on order)