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Thread: 15/20 vs 15/21

  1. #1

    15/20 vs 15/21

    hey my ski is hitting the limiter now with a 15/20 wondering how much difference running a 15/21 will make?


  2. #2
    Rxtxruss's Avatar
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    Going from a 15/20 to a 15/21 it should drop 100 rpm or so

  3. #3
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    More like 300 rpms.
    Last edited by ncdoo; 08-09-2015 at 04:10 PM.

  4. #4
    or am i better to leave the 15/20 in try and turn the limiter up to 8500? im running a stock valve train

  5. #5
    Ken62465's Avatar
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    tweak the trailing edge of your 15/20

    http://www.greenhulk.net/forums/show...ll=1#post30039

  6. #6
    hkss's Avatar
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    you will never know before testing. Boost and RPMīs going Hand-in-Hand. Lower RPM lower boost.
    In the range of 8100-8500 I would not change to the next step of Impeller it is too much.
    When you reaching 8650 and more (8900) then it will be a consider worth - or a pump cone.
    This is my personal mind. I am not a professional. Most member here know it better.
    But I am testing some Impellers at the moment - and this is the rough result from testing 5 Impellers.
    When I am finish testing, I will present the results here in the GH.

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