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Old 02-19-2007, 11:11 AM
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torque and horsepower

We all know about parasitic horsepower loss through the drive train but, what about torque? How would the torque value from a chassis dyno at the rear tires compare to what is actually at the input shaft of the transmission. It almost seems like the differential gears would be like a torque multiplier. The reason I ask is the turbo motor in the rambler I'm building should produce around 650 horsepower and 600 ft lbs of torque at the rear wheels. The t56 transmission I'm using is rated for 450 ft lbs so, knowing the torque value at the crank would be quite useful. I know that dumping the clutch at 5000 rpm and power shifting will be out of the question.

Thanks. Ed

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Old 02-19-2007, 11:39 AM
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Horsepower is a function of torque over time.

HP = TQ * RPM/5250

So the horsepower loss through the drivetrain is actually a function of lost torque.
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