Also part of the problem Chip is they like to run way over 250bhp per litre with 8.6:1 compression on road engines.
So need race fuel to not det their tits off under big loads or big boost.

And think lowering the compression is a dirty word and will ruin the cars drivability and wont make any power, and other witchcraft.

So instead use mega duration cams and oversize turbos with huge exhaust housings running lowish boost to help compensate for the high compression, making the cars have no power under 5k, thus ruining the cars drivability