Buy a real dyno
IMPACTPLAYR;
1) I have a REAL Dyno. (Robitronic) DO YOU!
2) I disagree about the Track being ones Dyno. Unless you have access to a personal lap timer and an open track to practice on. It can be very difficult to gauge the performance of changes. And for the most part, not too many of us are Pro Drivers that can run perfect lines lap after lap, so some of the variables need to be removed to accurately make comparisons.
But hey, this is just MY opinion.