I guess I've done a poor job making a point here, but on the dyno shouldn't it be basically a rwd car and not speculated on as a awd car. Therefore wouldn't the idea that it has 570hp be a improbability.
But the comp systems would then give better acceleration times then a rwd car with similar horsepower due to better use of that power.
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In a straight line it only would in terms of grip off the line. Unless one set of tires are spinning there is no gain by applying torque to the other set of wheels. Hence the GTR should beat the z06 off the line, but should be roasted anywhere else (again see the r and t times).
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Being awd, the GTR will lose a higher percentage of power through the drivetrain than a rwd car would.
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This is true, but the point is the switch between the two will not generate a huge increase in bhp when the car switches modes. If you assume the rear portion of the awd system has a drivetrain loss similar to the rwd that means the awd portion should at least in theory lead to increase much less then half the drivetrain loss of the rwd. Why? Because you don't factor in the transmission loss twice.
If we assume a bhp of the gtr of 507 bhp, thats 2 bhp more then the vette. Now unless some miracle occur we can also assume similar driveline losses. So we can essentially estimate the bhp in rwd mode is probably close to that of the z06. We can also pretty assuredly say its not going to result in bhp well beyond that. Which again begs the question of how to move 700 extra pounds.
This basic discussion, granted with the assumptions being assumptions, applies to all manner of other awd cars. Cars like the 911 and lambo have not seen a miraculous jump between the various modes. You would expect similar experiences since the systems are relatively similar (other then the gay ass double driveshaft).