[toffytofik]

All right gentlemen, here's something to ease your discussion there (Dyno vs Road power graphs included)


MOTOR TREND: 2009 Nissan GTR Acceleration Test

http://www.motortrend.com/roadtests/...est/index.html

Results:

0-60: 3.2 sec
0-100: 8 sec
Quarter mile: 11.6 sec @ 120.0 mph

WHAT'S THE SECRET? There are three factors helping the 3879-pound GT-R appear to dodge the laws of physics: 1. Horsepower and torque. Our testing on the four-wheel Dynojet dynamometer at K&N Engineering indicated that the factory ratings of 480 horses and 430 lb-ft are discounted by at least 5 and 14 percent, respectively. To verify the accuracy of the dyno readings we ran a fourth-gear acceleration pull at El Toro and computed the horsepower required to accelerate the mass of the car and driver, plus the power lost to aerodynamic drag and tire friction (using Nissan 's 0.27 drag coefficient, a 22.5-sq-ft frontal area computed per SAE formula and assuming a 0.020 coefficient of rolling friction for the tires). Note how closely the overall shape of the curves match, including the slight plateau from 4000-4500 (intake cam timing change?) 2. Short Gearing. The Nissan GT-R 's overall gearing (including tires) is among the shortest in supercardom. The Porsche 911 Turbo that served as the GT-R 's performance target spins gearing that's taller by an average of 10 percent in the first three ratios, while the Corvette Z06 it competes with most closely on price averages 40 percent taller in the same three gears. Short gearing effectively increases the engine's "leverage" but results in more frequent shifts, which can add time (the Z06's 0-to-60-mph trick is hitting 60 mph in first gear with no time-consuming shifts). 3. Uninterupted torque during shifts. Nissan quotes a 0.2-second time required for shifts, but this is simply the time that elapses between ordering a shift at the steering-wheel paddles and accelerating in the next gear. What isn't mentioned is that rather than coasting with the clutch disengaged during that time (as happens during a 0.10-second Ferrari F1 shift or a 0.15-second BMW SMG shift), power is still flowing through the previous gear. Those precious tenths add up in other cars, but torque interruption is imperceptible in the GT-R. Manual shifts in the Porsche or Corvette consume about a quarter of a second each, and there are at least three of them in a quarter-mile run. And that, dear GT-R fans, is the science behind the apparent magic that allows this two-ton Godzilla to sprint like a cheetah. Our final installment will dissect the Nissan GT-R's handling performance. Stay tuned.