Quote:
Originally Posted by eurohazard
Car and Driver got 420 wheel HP out of a production car. Assuming 20% loss....the flywheel horsepower is still substantially more than 480 hp rating. By my calculations it's ~526 hp at the flywheel. 526 x .20 (or 20%) is 105.4 HP lost. 526 - 105.4 hp = 420.8 HP at the wheels.
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This is on a Mustang Dyno:
Unless the 911 Turbo is severely underrated as well, then it is just fluff (the Turbo actually advertises 7 less crank horsepower). They make essentially the same numbers. They claim essentially the same numbers.
And for comparison, a Z06:
As seen with the Z06, powertrain loss in a conventional manual is ~10-12%. Having another prop running to the front of the car (a la GTR/911) doesn't double the inefficiency from 10% to 20% (the GT-R has two shafts, since the transaxle is in the back while the motor is in the front; the 911 only has one shaft going to the front).
It doesn't have the power everyone says it does. Traction plays a huge role in 0-30 and 60ft times, but power makes trap speeds. According to R&T, they all hit the quarter mile within a tenth of each other, but the Z06 does it 7mph faster and the 911 does it 5mph faster than the GTR. Likewise, the GT-R is a second slower to 120mph than the Porsche and 2 slower than the Z06 (but if it makes more power at the wheels, has better aero, faster shifts, and better traction, should it not be faster everywhere in a straight line as well?)
That said, the suspension geometry, active suspension and computer controlling power on that GT-R is incredible.