[amanbret]

Hi yes there are many variables 20-30 percent is average. But sometimes as hp increases so does loss due to inertia losses witch includes anything in the driveline. To back this claim if you ask anybody that runs an engine dyno they program rate of accel common rates are 150 rpm and 300rpm
per second the faster rate I've seen show as much as 20 flywheel hp less. Hope this helps.