Anyone know how to figure out what the engine hp is i have 241 whp

 

15% is usually a good place to start when trying to figure out horsepower lost through the drivetrain. So 241whp*1.15 would be roughly 277.15 flywheel horsepower. Of course, every setup is different, and things like a lighter rotating assembly, or omitted accessories will change that figure, but whp + 15% is a good general estimate.