The 300-horsepower 4.6-liter V-8 found in the 2005 Mustang GT boasts a very healthy 65.2 horsepower per liter of displacement. The V-10 engine at the heart of the GR-1 concept is even more adept at unlocking the energy in a gallon of gasoline. This amazingly efficient powerplant is able to generate 94.5 horsepower per liter of displacement without the benefit of turbocharging or supercharging.
This is definitely race-car territory. Race cars, however, do not have to operate to the refined level expected of – and demonstrated – by the GR-1. Nor do race engines have to labor under the constraints of mufflers, restrictive exhaust systems and emission controls.