[Dave-ROR]

Originally Posted by C4RBON

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.

Some do. You average dynojet doesn't (the LC series do I believe but I've never seen one anywhere). Mustang dynos are great for a loading dyno but many people don't like the low numbers they show.

Loading dynos are an absolute must for any real tuning IMO. WOT tuning on something like a Dynojet 248 is fine but that's literally all you can really do with one, oh and show off numbers. Dynapacks I would NEVER use, they put an insane load on wheel bearings (think huge wheel spacers) and are useless for anything other than portability and numbers.