Quote:
|
Originally Posted by NickCats
Look at the graphs a little closer...
1st graph ( baseline ) is metric - Speed ( km / hr ) & Power ( kW ).
2nd graph is Speed ( mph ) & Power ( hp )
1st graph is showing stock with no work ( but in metric measurements ) with four runs of 162, 163, 164 & 167 kW ( not hp )
2nd graph is comparing no headers ( blue line - 224 hp ) and headers ( red line - 231 hp )
Nick
|
I see. So what you are saying is he had a 7hp increase during his baseline runs with no changes, under very similar run conditions (margin of error) and a 7hp increase after header install, 8 months later, 25F cooler ambient temp., higher barometric pressure, higher humidity, different tank of gas, different tire wear etc. etc.
Don't misunderstand me. I believe a 7hp increase is possible and I appreciate his efforts to document performance changes to his car. I just get frustrated when I see a margin of error that exceeds reported gains. Everything below the margin of error is just background noise. I am afraid we have not learned very much.
I think Bisimoto has some of the most detailed and carefully controlled dyno runs I have seen on a Boxter and still there is some margin of error. By repeating before/after results he has proven a measureable hp increase which exceeds the margin of error by desnorkling his car. Clearly the snorkle is a Porsche compromise for intake noise abatement and to prevent possible water injestion. I hope more studies are done this way so we can get "proven results" on performance mods. Until then we don't really know what increases in performance are possible.