Drivetrain loss & torque

Dumb question; does drivetrain loss apply equally to torque as well as HP? Would you expect the % of loss to be the same?

Earl, there is only torque being measured on a dyno (I assume you are asking with respect to dyno numbers). The hp is calculated from the measured torque. Therefore, if you assume a simple percent loss for the torque due to the drive train then this loss would also apply to hp.

HP = Torque * RPM / 5252

Torque is measured in foot-pounds for this equation to be correct.

Ron

Thanks Ron - geez, if I had spent another 30 seconds thinking about it I probably would have realized that.

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Originally Posted by Ron Earp

Earl, there is only torque being measured on a dyno (I assume you are asking with respect to dyno numbers). The hp is calculated from the measured torque. Therefore, if you assume a simple percent loss for the torque due to the drive train then this loss would also apply to hp.

HP = Torque * RPM / 5252

Torque is measured in foot-pounds for this equation to be correct.

Ron

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Right on.

This is precisely why it's very near sighted to use a toruqe measurement to compare cars. HP through the useable RPM range is what matters.

Grafton

Quote:

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Originally Posted by GKR_17

HP through the usable RPM range is what matters.

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AKA "power under the curve"