Originally Posted by Motordyne

I would have preferred to see more same day pre/post dyno pulls to equilibrium to be sure.

One baseline run may indeed be valid but it would be better with more runs showing repeatability. When you are assured of repeatability you are assured of the pre/post accuracy.

Note: If anybody does same day pre/post dyno testing of any part, weather the numbers are moving up or down, dyno each condition until it no longer moves and then get your three runs for each pre/post condition. This will give the most confident test results.

This is the way I do all my dyno testing.