You can "lie" to a chassis dyno. All you are trying to do is control the rate of acceleration. So if you tell the dyno that the car weighs 4000lbs, when it really only weighs 3000lbs, you will get more control. Many ways to do it.
On the "adjustable" dyno's that's probably true.. The dynojet has no inputs beside the firing cycle degrees to set the tach input. I guess you could try putting the weather station stack in a toaster oven if you were so inclined to mess with the output, but the altered data would be naked in the run file.
