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post #1 of 4 (permalink) Old 02-24-2011, 01:48 PM Thread Starter
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Horsepower Calculation

Hello All, does anyone know the formula for translating rear-wheel horsepower and rear-wheel torque into horsepower and torque at the crank? For instance I had a dyno recently and have 234hp at wheels and 238 torque at the wheels. I'm looking to have those numbers translated into power and torque at the crank. Thanks, Steve.
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post #2 of 4 (permalink) Old 02-24-2011, 01:53 PM
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Auto or manual? I believe it's approximately 20% loss through the auto and 15% through a manual.

89 Cougar XR-7...slightly modded, 240 rwhp / 340 rwtq, Best time as of 4/22/12 = 13.11 @ 103.82, 1.78 60'
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post #3 of 4 (permalink) Old 02-24-2011, 01:56 PM Thread Starter
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it's an automatic 4R70W.
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post #4 of 4 (permalink) Old 02-24-2011, 02:12 PM
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So...292hp and 297tq roughly.

2011 Dodge Durango Crew 5.7L HEMI

2001 Volkswagen Beetle GLX 1.8T
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