Quote:
Originally Posted by Tyandriel
All a dyno measures is the rolls rpm over time. With the known moment of inertia of the dyno rolls and a car specific factor all the rest is calculated.
If the results are good depends on a proper mechaniccal use of the dyno and a realistic carīs factor. Plenty of playground to fake a sheet.
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I'm pretty sure some dynos apply real load to the wheels. What you're talking about is using the inertia as the load. There would be a nightmare's worth of assumptions and correction factors necessary to get meaningful results... I don't doubt it is possible though. Probably the cheapest option , too.
I know engine dynos actually apply a known load to the engine to see what RPM the engine can hold it at. I thought some wheel dynos did this as well.
The wikipedia article has good info on the different types of dynos.