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  1. #1
    alex29573's Avatar
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    keyway and impeller questions for gp1300r

    ive noticed some people do 3 degree and others do 4 degree keyway... Whats the up and downs of one vs the other?


    also, whats the difference between a concord - dynafly- and nujet?
    which nujet is the best for a stage 2 1300? i think there is a 5.5 6.0 6.5..
    why not just keep the stock impeller and pitch it to 14/20?
    what is a setback impeller?


    thanksto all in advance!
    Last edited by alex29573; 05-21-2008 at 03:36 PM.


  2. #2
    ecpChris's Avatar
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    The 4 degree keyway offers slightly better acceleration than the 3 degree
    Talk to WFO (rich) about ordering one. They are cheap and wake the ski up big time.
    Last edited by ecpChris; 05-21-2008 at 04:08 PM.

  3. #3

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    I have a 3 degree keyway. Is it worth switching out for the 4 degree one?

  4. #4
    Moderator OsideBill's Avatar
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    as far as the impellers go what year is your ski? if it is pre 05 does it have the upgraded pump? these narrow down your choices and then we can compare apples to apples.

  5. #5
    alex29573's Avatar
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    2006 gp1300r

  6. #6
    ecpChris's Avatar
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    get a 14/20 dynafly. To my knowledge noone has really seen or tested Nujet props for the 05 and up pumps. Concords will not fit on your pump
    Setback impellors are "setback" closer and are supposed to improve water hookup.

  7. #7
    alex29573's Avatar
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    so setback improves hookup but does it tradeoff top end? or is it a win win situation?

    just wondering- do they make setback impellers for an old pump like in 2002?

    also, how come a stock impeller pitched to 14/20 wont work like the dynafly?

  8. #8
    GPryan's Avatar
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    There is a lot more to a prop than pitch. The root and transition phases are different.
    Last edited by GPryan; 05-22-2008 at 04:11 PM.

  9. #9
    ecpChris's Avatar
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    From what I hear setback does not tradeoff top speed

  10. #10
    07vette's Avatar
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    Quote Originally Posted by gprjersey07 View Post
    The 4 degree keyway offers slightly better acceleration than the 3 degree
    Talk to WFO (rich) about ordering one. They are cheap and wake the ski up big time.
    +1

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