Daryl Alison of JSpecConnect has now taken one of the first U.S.-delivered cars for a dyno run and compared with a 911 Turbo to find out what gives. You may recall that late last year, a GT-R in Japan was tested using a Dynapack dynamometer ( a dyno that connects to the actual wheel hubs of the car) and showed a peak output of 475hp at the hubs. Unfortunately, the credibility and accuracy of the test could never be confirmed.
The latest round of testing was done by the guys at Harman Motive in Torrance, California, in collaboration with auto site Edmunds and was completed using a Mustang MD-AWD-500-SE chassis dynamometer with rollers. A Dynapack dynamometer was also used for completeness.
On the Mustang dyno, the GT-R registered a peak output of 406hp at 6,400rpm and 560Nm (414lb-ft) of torque at 3,800rpm. Once you factor in the parasitic losses of the drivetrain, these numbers are fully in line with Nissan’s official figures. On the same dyno, the 997 Porsche 911 Turbo almost completely matched the GT-R. The power curves of the two cars looking almost identical.
The final check was done using the Dynapack dyno. Here the GT-R measured a peak output of 452hp and 606Nm (448lb-ft) of torque at the hubs, which is reasonable given the higher reading expected due to the elimination of the tires and several internal variations in the way power is calculated.
The final conclusion is that Nissan’s power figures are an accurate representation of the GT-Rs might, and as brilliant as the new twin-turbo V6 is equal credit must be given to the car’s new launch control system, dual-clutch gearbox and ATTESA-ETS AWD system as these are what help give the car its mystifying track times.