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Originally Posted by WRPI0
But the thing is, the hub dyno gives as useless a reading as flywheel kw because you dont drive around on your hubs, wheel kw is actually your final usable power reading
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A hub dyno reading is far from useless. As mentioned by Jester above, there are a lot of tricks that can be done on a roller dyno to increase/decrease power output.
The major advantage of the hub dyno is it is very consistent, which allows you to see the performance gains (or losses) of a particular modification.
The big thing is a dyno readout is just that, a readout on a particular day for particular conditions. Comparing dyno to dyno and doing the "Ha I beat you by 1hp" is crazy.
Power output and the quarter mile terminal speed are some of the best indicators of a cars true speed in my opinion.