Quote:
Originally Posted by Dougal
RPM and km/h are interchangable if you know all the gear ratios in-between. I suspect most dyno operators don't so that's the default.
The only vehicles I've seen dyno'd live were on hub-packs. They stuck a clamp lead on a spark plug and run the engine at 3000rpm to calibrate the dyno. Once they know the overall drive ratio it's run and plotted with wkw vs rpm.
The other advantage of hub dynos is no slippage. With a rubber wheel on rollers the actual rolling radius isn't quite your wheel radius.
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Yes I understand the hub type dynos and I do like them more than the tyre type dynos.. as you mentioned, it takes another variable out of the calcs. I just didn't know if there was a "real" reason to change to something that I thought was quite satisfactory... ie rpm v mph .. thnks for the info