Just something I thought of. On dyno readings it says that torque numbers at the rear wheels are lower than flywheel numbers. Well if the engine is running at a greater speed than the wheels, shouldn't the torque numbers be higher at the rear wheels than at the flywheel? Isn't it just like an electic motor hooked to a gear reduction box? The motor puts out x amount of torque, and the shaft/axle output is much higher. Isn't it?

What am I missing?

p.s. I'll bet I'm going to look pretty bumb after the answer is given:rolleyes:

The reported torque on a chassis dyno is calculated based on engine RPM, but it is measured at the tires. The reported torque is not actually RWTQ, it is calulated engine torque minus driveline loss. True RWTQ is what propels the car/truck down the road. It changes based on what gear you are in, what size your tires are, and your rear end ratio.

Confused yet? A dynojet doesn't measure torque at all. Nor does it even care how fast the engine is spinning or what gear it is in. It measures the acceleration of a known mass (drum) and derives HP from it.

Thank you very much.

So true rear wheel torque is (engine torque)(trans. gear ratio)(rear end ratio)?

And wheel radius.

Thanks again McRat.