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  1. #3841
    Active Member Two Rings Morritse's Avatar
    Join Date
    May 08 2018
    AZ Member #
    My Garage
    Stage 2 b8 a5 (sold)
    Berkeley, CA

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    Guys it's not as simple as rotational parts taking X more energy to move than parts moving in a linear manner. It's a function of the gemoetry and weight distribution of the part in question. Look up angular momentum. You can use continuum mechanics to get an idea of how much more important angular momentum matters than Cartesian momentum for a given part.

    If Porsche said 6x, they were probably talking about their specific engine. This calculation is an extremely complex function of the gemoetry if their specific engine. It may be a decent ballpark, but in no way relevant to our cars.
    Dual pulley e85 w/ TCU tune (EPL)
    Full custom exhaust (Catless)
    Brembo BBK
    APR CPS cooling system
    034 front and rear sway bars Transmission inserts, cr 15 bar strut brace, density control arms
    Koni sport shocks with Eibach lowering springs
    VMR v804 Wrapped in PSS (255/19/35)

  2. #3842
    Established Member Two Rings
    Join Date
    Dec 14 2014
    AZ Member #
    My Garage
    2015 GL450

    Should I run a Dual Pulley Tune with stock sc pulley and 194mm crank? I'm currently running 034's stage 2 with 179mm only. With the 194mm, it will put me at 3.067 pulley ratio.

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