Mustang Dyno's add resistance to the rollers simulating your 1 to 1 gear of a 1/4 mile run. so say my Mustang runs 4th gear from 75-115 mph (about 2000-5800 rpm) I believe that there is a wind resistance figure added in the dyno pull.
Your car may put down 300 rwhp sitting still on a Dynojet, but it is not putting that same number to the wheels at 100 mph. The demands on the engine are different, therefore most likely requiring different tuning. That is how a Mustang Dyno gives a car a harder workout.
I'm sure you could take the wind/weight factor out and get Dynojet numbers. As well as you could fudge the numbers to make customers happy. I was a bit disappointed with my 270 rwhp, but I can't argue with 111 mph traps. Does not look like any fudging on this particular MD.
Mustang Dynos can also hold a car at a given rpm at WOT. I know there is much more to this and I don't know it all. Turbolx has a Mustang dyno and maybe he will chime in with some details.
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