Zcarmenb28
Well-Known Member
Nah, this is not completely correct. Europe uses PS which is a slightly smaller value than American hp. So, the McLaren 720S is rated at 720 PS which equals 710 us hp. That said, the way they rate them differs. Most American manufacturers now use the SAE rating which is the power at the crank under certain atmospheric conditions with exhaust and accessories connected. However, German cars use some other unknown rating because most of them are severely underrated compared to the SAE standard. I speculate they rate them at something like 5000’ elevation at 95 deg F, for an extremely high density altitude, which is why in normal or good air (eg 60 deg F at sea level) they make so much more hp than we’d expect. The DA of the SAE number is somewhere around 2000’ DA.the US advertises HP, thats the total power that the engine can make
Europe uses break horsepower (known in the US as crank horsepower) thats the amount of power that is made accounting for frictional losses within the engine itself (something like 98-99% of HP)
WHP is a number people in the aftermarket like using as that accounts for all aspects of the driveline from the engine to the wheels.
so the numbers would look more like
HP: 460
BHP: 454
WHP: 420
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