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    • 2020 Ford Shelby GT500 output comparison between 2.65 and 2.75 supercharger pulleys on E85

      Great comparison here showing how different pulley sizes affect output. Obviously, you change pulleys to change how quickly the supercharger spins. The idea is more rpm, more air, and more boost pressure.


      There will be plenty of pulley combinations tried in the next few months but what we have here are a 2.65 and a 2.75.

      Palm Beach Dyno tuned both GT500's and measured the results on their Dynojet.

      The difference here is roughly 1 psi of boost:


      Now, the peak power change is not much which is to be expected. However, notice the blower with the more aggressive pulley comes on a bit stronger under 4k rpm.

      What you can also gather is roughly 20-25 whp per psi increase depending on supporting mods but there is also of course a point of diminishing returns.

      Well done and informative data from Palm Beach Dyno.


      This article was originally published in forum thread: 2020 Ford Shelby GT500 output comparison between 2.65 and 2.75 supercharger pulleys on E85 started by Sticky View original post
      Comments 1 Comment
      1. Bowser330's Avatar
        Bowser330 -
        This car is such a beast man, 800whp.

        Perfect candidate for a Ford Performance GTR500:
        GT500 tuned to 800hp with Ford Performance AWD DCT transmission