whp = bhp
Jun 27, 2007, 12:16 PM
#1
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whp = bhp
does anyone know how to calculate whp to bhp? i have 320 whp on my 05 8 and wanted to see what my bhp would be....thanks.
Jun 27, 2007, 12:21 PM
#3
Brake horsepower (bhp) is the measure of an engine's horsepower without the loss in power caused by the gearbox, generator, differential, water pump, and other auxiliary components.
So you would have to account for the power loss through the whole drivetrain and belt driven components. I would say add ~15-17% to WHP.
So you would have to account for the power loss through the whole drivetrain and belt driven components. I would say add ~15-17% to WHP.
Jun 27, 2007, 12:21 PM
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This is not that accurate but close...
(Your HP at the wheels) * (18% drivetrain loss) = Your car BHP.
So... 320whp * 118% = 377.6bhp
If there's anything wrong with this calculation please chime in guys.
(Your HP at the wheels) * (18% drivetrain loss) = Your car BHP.
So... 320whp * 118% = 377.6bhp
If there's anything wrong with this calculation please chime in guys.
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Jun 27, 2007, 12:34 PM
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It depends on the dyno, the car, and a billion other things... there is no magic precent. your best bet is to ask the person where you had it dyno'ed as to his or her best guess on the drivetrain loss to thier dyno numbers
Jun 27, 2007, 12:36 PM
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Hmm.. Rule of thumb for driveline loss of a RWD solid axle manual is about 15%, 20% if it is auto. I know the Subaru STI has a driveline loss of roughly 26%.
Here's an easier way to get a general rule of thumb. How much does a 100% stock Evo pull on the wheel dyno you used? You know what the Stock Evo makes at the crank, so you can get a relative idea of the loss involved and work backwards from there.
Here's an easier way to get a general rule of thumb. How much does a 100% stock Evo pull on the wheel dyno you used? You know what the Stock Evo makes at the crank, so you can get a relative idea of the loss involved and work backwards from there.
Jun 27, 2007, 12:43 PM
#11
Hmm.. Rule of thumb for driveline loss of a RWD solid axle manual is about 15%, 20% if it is auto. I know the Subaru STI has a driveline loss of roughly 26%.
Here's an easier way to get a general rule of thumb. How much does a 100% stock Evo pull on the wheel dyno you used? You know what the Stock Evo makes at the crank, so you can get a relative idea of the loss involved and work backwards from there.
Here's an easier way to get a general rule of thumb. How much does a 100% stock Evo pull on the wheel dyno you used? You know what the Stock Evo makes at the crank, so you can get a relative idea of the loss involved and work backwards from there.
Jun 27, 2007, 12:47 PM
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That's why I specified the dyno he used. But if there is no way of knowing how much crank hp the Evo comes with stock, then we're right back to the rule of thumb. So I'd say ~25%.
Jun 27, 2007, 01:23 PM
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great! thanks for the info...unfortunately, my car got dyno'd in hawaii and i am now in nv....oh well, i guess i'm just gonna have to be happy with whp, its better anyways.
