With the launch of the all-new 2011 Mustang GT ongoing, the team at InsideLine decided to strap the new 5.0-liter pony to a dyno to see just how accurate the car’s claimed numbers are. If you’ll recall, Ford officially boasted a total of 412-hp and 390 ft-lbs of torque.
A total of seven pulls were done with the final few runs laying down 395-hp at 6600 rpm and 365 ft-lbs of torque at 4350 rpm. InsideLine claims that due to the solid rear axle the ‘Stang will only see a drivetrain loss of roughly 11 to 13 percent power. And it doesn’t take a calculator to figure out that the 17-hp difference between the claimed flywheel number and the dynoed wheel horsepower number is far less than that. So what gives? Well, there are two possibilities. The first is that the pre-production models are pumping out more power than stock. The second option is that Ford has underrated the car’s 412-hp number – always a smart move.
Normally a car with 412-hp would lay down numbers closer to 360 whp. Instead, with 395 tested whp, it looks like the new 5.0 ‘Stang makes closer to 440-hp. Not bad!
InsideLine says all pulls were done on a Dynojet 248 chassis dyno in 4th gear using 91 octane and with a 3 percent weather correction factor.
See after the jum for a video of the dyno pull: