After seeing the BoP tables for the Nürbugring at the weekend, I've been wondering just what is so special about GTE engines. The Porsche GT3R and RSR both have a four litre flat six and make similar power after the air restrictors have been fitted. Yet the GT3R has 2x41.5mm restrictors (FIA spec) or 2x36mm restrictors (Nürburgring spec) while the RSR has 2x30.9mm (as of the race at Spa). I was hoping some of the more technically-minded people on here might know.
Sources:
https://24h-information.de/wp-conten...12.05.2018.pdf
https://www.fia.com/fia-gt-committee
https://www.fia.com/events/world-end...ance-committee (Decision 18)