When you get over 400-500 hp, you can't just say the car loses 15%. Rule of thumb is out the window. If a drivetrain takes 70hp to spin at 7000 rpm with a given set of gear ratios, then it's +70 hp at that rotational speed to get pretty close to crank hp.
The parasitic loss of a roots blower is a wildcard, but assuming it wasn't running hot yet...
as an example- a C4 corvette typically takes 65hp to overcome the drivetrain- maybe a little more if you are spinning to 7000 rpm.
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