How Much Power Has The Shelby GT500 Lost After 182,271 Miles? @ Top Speed

The guys at Late Model Restoration (LMR) have given us a video on their YouTube channel, in which one of their representatives has bought a high-mileage, 2012 Ford Mustang Shelby GT500.

“She’s got some miles on her”, Jay Walling, the owner of the car, says, as we see 182,271 miles (293,336 km) on the odometer.

This being a 2012 model, it’s equipped with a 5.4-liter (not the 5.8) supercharged V-8 that puts out (or at least it did) 550 horsepower and 510 pound-feet (692 Nm) at the flywheel.

Power, of course, goes to the rear axle, through a Tremec 6060, six-speed manual gearbox. According to Landan, we can expect a drivetrain loss of 12 to 15 percent, which is normal for a front-engine rear-wheel-drive layout.

How Much Power Has The Shelby GT500 Lost After 182,271 miles?
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The first dyno pull shows very good values, as it measures 465 rear-wheel horsepower at 5,800 RPM and almost 475 pound-feet (644 Nm) at 4,000 RPM. The second run, however, shows lower numbers – 450 horsepower at the wheels and almost 471 pound-feet (639 Nm).

While testing, they found that the intercooler pump was not working properly due to a bad relay. After going around the minor hiccup, the guys at LMR did an after-pull, which revealed 486 horsepower at 5,900 RPM and 486 pound-feet (659 Nm) at 4,200 RPM to the wheels.

Accounting for a 12-percent drivetrain loss, it is revealed that this 2012 Shelby GT500 is still capable of 550 crankshaft horsepower and 510 pound-feet (692 Nm), despite showing 182,271 miles (293,336 km) on the “clock”.

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