Steve,
I don't see why you can't duplicate on track running on the dyno. 1 lap at most tracks is around 1:30 to 2 minutes. I could give you appoximate rpms. Now that is a datalogging session i would like to see. How do you have your hooked up, wot turned of or just a switch?
There are very few shops with a loading dyno.. which would be needed to even come close to an accurate test.