When owning a performance car, every bit of horsepower counts. That said, over time, wear and tear takes its toll on performance and some of those horses run away. Of course, it mainly depends on how the engine has been treated, both in terms of driving and maintenance. Mileage also takes its toll on the mechanical components of a car. But just how much power (if any) is lost over time? This “tired” Mustang Shelby GT500 answers that.
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.
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.
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.
