You cant find out the true transmission loss just by measuring the power at the wheels.
Although it is not very not accurate,the rolling road machine will calculate losses for you. That is why the operator coasts down the car on the rollers from high rpm in neautral.
People talk about a percentage you can use yourself to work it out. That is just from averages over time. The average rear wheel drive road car with between 100 and 200 bhp loses about 17% of the engine bhp as transmission losses.
Only way to know the true transmission loss is to measure the flywheel power on an engine dyno and the wheel power on a chassis dyno and take one away from the other
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Originally Posted by s13eater
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