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in my experiance hp losses through the drive train are more of a static figure that a dynamic shift. a car will generaly lose a specific ammount of power through the drive train and as hp increases the drivetrain loss remains mostly the same. my miata for instance is well known to lose 28-30hp to the wheels in its non turbo form. even with 130whp over the standard car I am still not losing more than 35hp to the wheels. drivetrain losses in the 135i should be in the 30-40hp range. a corvette loses 40-50hp and I would imagine that the 135i drivetrain is more efficent.
I postualte that the output of the N54 is in the range of 315-320 with 325-330 lbft of TQ.
only an engine dyno will say for sure
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