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# How do you convert engine horsepower to wheel?

Updated: 4/28/2022

Wiki User

14y ago

There are many variables in this but gererally for an automatic car, there is a 22% loss in power from the engine to the wheels and for a manual about an 18% loss. If you made 250 wheel hp in an automatic car you should be around 305 hp at the engine.

Wiki User

16y ago

Wiki User

14y ago

You get the engine horsepower from the manufacturer. They take it off the flywheel. You take wheel horsepower by putting a steel band around the tire. There is a pole attached to the band. The pole extends out a foot or two from the vehicle. A big flat square piece of metal is attached to the end of the pole. That piece of metal is put on a scale. That way a shop figures out wheel horsepower. The conversion shows that about 50% of the power at the flywheel makes it to the wheels. Since electric generators and motors have greater than 90% efficiency, conversion to gasoline-electric vehicles could theoretically double mileage.