Is there a specific calculation for converting flywheel to wheel power figures and back?

Its for AWD/4x4 drivetrain, is it around 20%?

I previously had a 4x4 Saph Cos that done 246 at the wheels, so would like to know the crank reading?

Also, currently have an Audi A4 2.8 V6 Quattro, runs around 210 just now, but have a supercharger kit that takes it up to 300BHP manufacturer quoted, but thats a crank reading, would like to know the wheel figure?

Cheers!