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2011 Mustang GT 5.0L Engine Underrated? Actually Makes 450 Horsepower?

2011 Mustang GT 5.0 Liter Engine

Back in August of 1999 Car and Driver magazine reported that during their review of the '99 SVT Cobra they found it impossible to obtain the claimed 0-60 times that Ford said the vehicle could do. Fearing that their cars were down on power many customers had them dyno tested only to find that the reports were true, the SVT Cobra was down on power. Ford investigated these claims and chose to discontinue sales of the 1999 Cobra while they worked to solve these short comings. Not long after the vehicles were recalled and the problems were fixed; the '99 SVT Cobra finally made its claimed 320 horsepower. It looks like that debacle really taught Ford a few things because if a recent report by Edmund's Inside line is to be believed the 2011 Mustang GT is making much more than 412 horsepower.

The 2011 Mustang GT is rated at 412 hp and 390 ft/lbs. Great numbers indeed, but possibly a bit conservative? Edmunds was able to get a pre-production 2011 Mustang GT on a Dynojet dynamometer and after several pulls was able to achieve 395 hp and 365 ft/lb at the rear wheels. Assuming a 10-13 percent power loss through the drivetrain that would mean that the '11 Mustang GT is actually making 440-455 horsepower at the flywheel! So that leaves a question in our minds, was the pre-production Mustang they received for testing unusually powerful or is Ford's claim of 412 horsepower very conservative? I guess we'll have to wait until we see what a production version does. In the mean time go check out the videos of Edmunds dyno'ing the car below.

Update 3/26/2010 - It looks like Motor Trend Magazine had the same idea. Not only did they dyno test the 2011 Mustang GT but they also got the 2011 Mustang V6 on the rollers as well. What was the result? With the GT they were able to muster a pull of 377.99 hp and 351 ft/lb, roughly 17hp less than what Edmunds reported. Assuming a 10 percent drivetrain loss, as Edmunds suggested, that would mean that the GT is making about 420 hp at the flywheel. On the other hand if you were to assume a 15 percent power loss due to drivetrain friction, like Motor Trend suggests, it would be an incredible 444 hp! As for the V6 MT was able to achieve 267 hp and 259 ft/lbs, putting the peak power at the flywheel in the 297-314 horsepower range. MT suggests its probably right in the middle at 308hp, very close to Ford's claim of 305hp.

2011 Mustang GT Information
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2011 Mustang GT Video
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