What is really funny is that the numbers he shows aren't 30% in any case. He calculated 30% of the wheel hp, instead of 30% of the presumed flywheel hp. His number of 167 hp losses in the drivetrain is actually 23% of the measured wheel hp. Even that number is questionable, as it means that 167 hp = 125 kw are being radiated out of the transmission and differentials as heat.

If the standard vehicle makes 550 flywheel hp, and actually had 23% driveline losses, that means that 126 hp is being dissipated as heat. Why would modifying the engine result in 41 more hp being lost in the driveline? It is the same driveline as before the modifications. Any discussion of driveline losses as a percent is on a shaky foundation to start.

I don't know what is worse; this tuner not knowing any of that; or making an error in the calculation if we give him a pass on his illogical approach; or him knowing it is all bogus and trying to use it to sell his tune.

Wonder if it comes with a dash plaque saying 724 hp?

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue