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  1. #1
    Grand Cayman Tanny's Avatar
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    just GPS it here are my speeds

    Hey guys went out yesterday and gps my GPR got 66.4 not bad but was looking around 68-70 I don't know how much rpm I'm turning but going get the a head to raise my compression. I think that my pump is loading up too much and not enuff power to push the impeller I have? What you think I should do to get around the speed I'm looking for.


  2. #2
    Happily Self-Employed WFO's Avatar
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    That prop is probably a little too big.

    Get a good aftermarket tach to record your rpms.

  3. #3
    SpeedJunky's Avatar
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    Mill the stock head, that will help you turn the Dynafly.
    You should be seeing 70+ with those mods and head mill.

    You definitely need to get a good aftermarket tach.

  4. #4
    Hydrotherapy's Avatar
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    have you got stock angle on the ride plate????

  5. #5
    txgp1300r's Avatar
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    need better info..which grate ? efi settings ? your altitude ? angle on the plate ? trim tabs ? wfo can set you straight w/ your efi boat......I would cut the head to get 140-150 comp. and get a jims plate.

  6. #6
    Grand Cayman Tanny's Avatar
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    Quote Originally Posted by saltygpr13 View Post
    have you got stock angle on the ride plate????
    Yup its stock riva ride plate. I thinking of upgrading it to the RD rideplate bcus the water down here is mostly choppy all the time hardly calm water.

  7. #7
    Grand Cayman Tanny's Avatar
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    Wfo give my settings already just need to get my tach right now its 5518

  8. #8
    Grand Cayman Tanny's Avatar
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    Quote Originally Posted by txgp1300r View Post
    need better info..which grate ? efi settings ? your altitude ? angle on the plate ? trim tabs ? wfo can set you straight w/ your efi boat......I would cut the head to get 140-150 comp. and get a jims plate.
    I have 1200 grate I don't have no tabs now heard that really don't need them.

  9. #9
    Robsauto2's Avatar
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    I would leave the compression alone for now. That ride plate is holding you back, there is 3+ mph right there, 800 grate is 1-1.5 more also.

    You cannot tune properly without a tach!

  10. #10
    Grand Cayman Tanny's Avatar
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    What is the difference between using a 1200 grate and a 800 grate on my GPR does it load too much?? Which one will be great with my mods I have?

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