Originally Posted by DirtyD
I see it as a comparison tool. You can use it to measure gains from mods, that you can then couple with track times to back to those power gains.
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I think what steve is trying to say is what a car puts down at the tires has nothing to do with what i might run at the track. For example with an auto trans, if the converter is not locked during a pull, it can affect the numbers by as much as 20-30 hp, now let me emphasis on the CAN part. Also things like the stall speed of an aftermarket converter will affect the dyno numbers. Dynos were invented as a useful tool to assist in tuning a car, diagnosis a problem, properly calibrating a speedometer, etc. They are used for much much more then just finding a number.