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Common  misconceptions about dyno's

Horsepower and torque figures are a strong predictor but do not guarantee a specific 0-60 mph or 1/4 mile E.T. (elapsed time). An engine accelerating in a vehicle experiences different conditions than on a dyno. G forces and different temperatures as well as different modes of vibration in a vehicle can cause significant differences in power output.

Another common misconception about dynamometers is

That they can damage engines. The dynamometer cannot make an engine work any harder than it is capable of, and this is no different to driving full throttle up a steep hill or towing a heavy trailer. Dynamometers cannot damage engines, but uncaring dynamometer operators can, just as uncaring drivers can on the road.