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    • Porsche 991.1 GT3 RS 4.0 liter dyno results have it coming up short of 500 horsepower - 476 horsepower

      The Porsche 991.1 GT3 RS has a naturally aspirated flat-6 rated at 500 horsepower. Do not confuse this with the new 991.2 GT3 RS which produces 520 horsepower. On the McChip-Dkr Superflow dynamometer in Germany the 991.1 GT3 RS struggled to put up its horsepower rating.


      It managed 'only' 476.2 horsepower at the crank at 8500 rpm:


      Now, that isn't bad but it does illustrate a bottleneck for Porsche.

      Just look at the 991.2 GT2 3.0 liter on the same dyno before and after tuning:


      The GTS hits 531 horsepower with much more torque through the curve. Obviously, it will be much faster.

      Even stock the GTS can give a GT3 a run for its money.

      Keep in mind the 991.2 GT3 and no doubt GT3 RS are much stronger than the 991.1 generation. Hopefully we get a 991.2 GT3 RS dyno soon to compare.


      This article was originally published in forum thread: Porsche 991.1 GT3 RS 4.0 liter dyno results have it coming up short of 500 horsepower - 476 horsepower started by Sticky View original post
      Comments 3 Comments
      1. subaru335i's Avatar
        subaru335i -
        Chassis dyno producing a crank hp calculation is dumb. Measure crank hp on an engine dyno and wheel hp on a chassis dyno.
      1. stosh1's Avatar
        stosh1 -
        Click here to enlarge Originally Posted by subaru335i Click here to enlarge
        Chassis dyno producing a crank hp calculation is dumb. Measure crank hp on an engine dyno and wheel hp on a chassis dyno.
        Agreed! I can make a guesstimate, but I'd like to see an updated chart with WHP!
      1. Sticky2's Avatar
        Sticky2 -
        Click here to enlarge Originally Posted by stosh1 Click here to enlarge
        Agreed! I can make a guesstimate, but I'd like to see an updated chart with WHP!
        The Europeans aren't into whp and I agree it's annoying.