How Much Horsepower Does A High Mileage Fox Body Make?

The Fox Body Mustang debuted in 1979 with production that lasted until 1993. This legendary vehicle brought the Ford Mustang into the modern era and saw massive changes in the design and appeal of the Mustang. . Today, the Fox Body Mustang is an affordable collector’s item with low mileage examples seeing low value growth while used Fox Bodies remain affordable. To see how healthy a high-mileage Mustang really is, the team at LMR put their Fox Body Mustang on the bench to see how many horses have been lost over the years.

The Mustang subject in the LMR video is a 1990 Fox Body Mustang GT with over 180,000 miles. This vehicle is used as LMR’s shop car and has not had the easiest life with multiple torque runs and constant work done for the videos on LMR’s YouTube channel. As standard, the 1990 Mustang GT was rated at 225 horsepower (168 kW) and 300 lb-ft (410 Nm) of torque, which may seem laughable in today’s world of 740-horsepower Mustang GT500s, but in the beginning of the 1990s, that was more than enough.

LMR’s dyno race shows that even after 180,000 miles of use and 20 years of consistent use, the Fox Body remains rugged. The dyno race boasts 223 horsepower (166 kW) and 295 lb-ft (399 Nm) of torque, which is very much in line with Ford’s stock claim. The car used by LMR is not original and benefited from a more aggressive rear gear ratio of 3.73 compared to the 2.73 ratios of the stock car as well as a smoother exhaust.

The resulting dyno numbers are impressive for a car of this vintage with such high mileage and are a surprising result. The Fox Body Mustang GT’s tough V8 can withstand years of use and abuse while producing the same power.

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