Nothing is wrong at all. The C5/C6 drive train is well docmented and well known to have a loss of approx 18%.
The AWD system with its various bits and pieces WILL consume more power along the way - there is nothing left to debate about C5/C6 drivetrain loss.
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I think you missed my point. Half the magazines have concluded that the Nissan is way faster then the Z06 (in the 1/4). Here we have a dyno resulting in a rwhp way below what a vette has. Now granted numbers always vary greatly dyno to dyno, but I think we can safely say the RWHP of the GTR is not significantly higher then the Z06. Yet it weights some 700 lbs more. That is the part that makes no sense.
The drive train loss makes perfect sense- well within limits at least. Id say 570 bhp doesn't make much sense but the rest of the numbers do. Its the comparative dyno that raises the WTF flag.