I can't give you physics or justify the change with mathamatical equasions. But the aluminum shaft I put in my 2011 Procharged car made a noticeable difference. Not a huge difference but noticeable. I never got to the track so I can't tell if the ET was better. And the dyno tune we changed was with the aluminum shaft. I was skeptical when I read about lighter shafts making a difference but now I know first hand it does.
BTW Shaftmasters sent me a notice if I was interested in sending the shaft back for a refund or replacement. Stand up company IMO. I forwarded the information on to the new owner and they gave him the same offer. Weren't the failures specifically on the V6 with the duel mass flywheel only? I believe that design acompanied with the harmonics may have had something to do with the failures? Any body know the mathamatical equasion for that one? !!!
BTW Shaftmasters sent me a notice if I was interested in sending the shaft back for a refund or replacement. Stand up company IMO. I forwarded the information on to the new owner and they gave him the same offer. Weren't the failures specifically on the V6 with the duel mass flywheel only? I believe that design acompanied with the harmonics may have had something to do with the failures? Any body know the mathamatical equasion for that one? !!!