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And is there a difference between HP and BHP?

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And is there a difference between HP and BHP?

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BHP is crank/flywheel HP, the number that is usually associated with the HP of the car.

if you see whp you know its wheel horsepower, a number you get by doing a dynamometer run.

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oh and our elise/exige weight roughly 1 ton so they would be 190/1= 190hp/ton

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WHP, Wheel Horsepower, is how much power the car actually puts down to the ground. The transmission has frictional losses, so WHP is always less than BHP. AWD cars tend to have more losses than FWD or RWD cars, but a good rule of thumb is about 10-15% loss.

HP by itself could refer to either, but usually refers to BHP if there's no other context clues.

I suppose you use 'tonne' or 'ton' if you live in England or the USA. Here, it's BHP per ton (2000 lbs). You simply find it by dividing the horsepower of a car by how many tons it weighs. Usually, here in the US, you'll see pounds per horsepower, which is just the weight of the car divided by how much horsepower it has.

A Lotus Elise weighs 1980 lbs, and puts out 190 bhp. So, it has 191 hp/ton, or 10.42 hp/lb. F1 cars have ~1250 hp/ton, while a Prius has about 73 hp/ton.

Here's a site that has a pretty comprehensive listing of other cars:

Power to Weight Ratios of All Current Cars.

Come on man, I'm HORRIBLE at math and realize this is off.oh and our elise/exige weight roughly 1 ton so they would be 190/2= 95hp/ton

If the car weighs 2000 lbs you would divide by 1 ton.

Edit: Nm, you fixed it before I posted.

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I'm assuming if a car for example weighed 1 ton and had 300 hp, it would have 300hp per ton and if another car weighed 2 tons w/ 500hp it would have 250hp per ton... right?

but there are short tons and long tons...

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very helpful post riddlefox... thanks!

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this guy has some interesting articles that are well laid out on some of this stuff, doesn't cover specifically this question, but none the less has good info.

Horsepower and Torque - Craig's Website at Backfire.ca

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