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Math guys: how to calculate crank hp from wheel hp?

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Old Aug 19, 2001 | 07:41 PM
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From: Funfax
Default Math guys: how to calculate crank hp from wheel hp?

It's been a long time since I took algebra...how would I get my crank hp from my whp? I am at 171.4hp and 124.7tq, what does that translate to at the crank?
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Old Aug 19, 2001 | 07:53 PM
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Default Re: Math guys: how to calculate crank hp from wheel hp? (Ross1013)

Wheel horsepower is usually around 15% less then crank horsepower on a front wheel drive car.
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Old Aug 19, 2001 | 08:04 PM
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Default Re: Math guys: how to calculate crank hp from wheel hp? (glock)

where in CT are you? I'm in hartford area.
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Old Aug 19, 2001 | 08:08 PM
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Default Re: Math guys: how to calculate crank hp from wheel hp? (glock)

use your stock dyno value to work out the coefficient with your 195HP and times the new reading of your dyno after modification.
{195/(stock dyno value)} x {your after mod dyno value}
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Old Aug 19, 2001 | 08:16 PM
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Default Re: Math guys: how to calculate crank hp from wheel hp? (DC2#309)

Stock dyno value? Unfortunatly I never baselined it. Hehe Im such a math moron...I cant even remember how to set this equation up.
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Old Aug 19, 2001 | 08:29 PM
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Default Re: Math guys: how to calculate crank hp from wheel hp? (Ross1013)

Would the calculation differ if you used a dyno which bolts up to the hub vs a rolling road dyno????

Sam
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Old Aug 19, 2001 | 09:00 PM
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Default Re: Math guys: how to calculate crank hp from wheel hp? (Ross1013)

~205/150
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Old Aug 19, 2001 | 09:05 PM
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Default Re: Math guys: how to calculate crank hp from wheel hp? (sgT)

hey thanks Sakai.
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