Originally Posted by TDIwyse
Don't know. I subscribe to the idea that dyno's are only useful for comparing relative changes. So using the simple GTech HP/TQ approach is useful for quantifying relative impact of mod's.
Interesting comparison of dyno variation with the same car, same day:
I agree. There is no more effective tool for gauging your car's performance than a GPS performance meter. I have a Vbox Performance Box, and A Gtech Fanatic. On the Vbox, I can run 3 consecutive runs and have a 1/4 mile trap within a few tenths of a mph. The slightest change in HP will show up. Funny how some of these guys with huge HP dyno results often underperform at the dragstrip.