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  1. #1
    Mike Greenwood's Avatar
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    Trying to get past 7100rpms...new sifb

    Have been working on this project ski. You frequent viewers will already know this. Either way, I have not been able to get the top end past 7100. Any thoughts?


  2. #2
    Moderator HiPeRcO's Avatar
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    What are your compression measurements?

  3. #3
    ripcuda's Avatar
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    7100 is getting close. How long are you running the ski? Is this right off the trailer?
    Is the water smooth?
    Are you using premium grade fuel?
    And yeah... compression #s are important. As they drop... so does power and max rpm/speed.
    Did you rebuild your jetpump? What does your impeller to wear ring clearance look like?

    Cheers!

  4. #4
    Moderator HiPeRcO's Avatar
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    Wouldn't a worn pump result in higher rpms? Or am I not thinking about this correctly?

  5. #5
    Mike Greenwood's Avatar
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    Comp is 140/140. Fuel is Sinclair 91 no ethanol, water is glass, pump has yet to be rebuilt. Waiting on parts/tools.

  6. #6
    Mike Greenwood's Avatar
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    Ran a full tank of said fuel through it.

  7. #7
    ripcuda's Avatar
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    Quote Originally Posted by Mike Greenwood View Post
    Comp is 140/140. Fuel is Sinclair 91 no ethanol, water is glass, pump has yet to be rebuilt. Waiting on parts/tools.
    Good comp, good gas, good conditions.

    A worn-out pump would be slowing you down speed wise. What is your max speed? (GPS?)

    So... no more check engine lights? All clear?

    Could be a boost leak... like a tear in a hose or something. It idles steady and well? If so, then it's not after the ETB (leaks there make for hunting idle).

    Might want to plumb in a real boost gauge and take it for a spin and see your actual max boost. This will be very telling. Could be a worn out turbo maybe.

    Just tossing out things to check.

    Cheers!

  8. #8
    hill160881's Avatar
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    I am in Owasso now. I will pm you my phone number tomorrow morning and if you want I can take a look at it. If I forget pm me. The forum won't allow me to accept friend request for some reason.

  9. #9
    Mike Greenwood's Avatar
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    Great hill, I can meet you after 1600 today if that's convenient. I am just a few miles from Owasso on 169

  10. #10
    hill160881's Avatar
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    Just give me a text when you are off and I will come take a look.

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