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Thread: Speed Issue

  1. #1
    Work Harder, Millions on Wellfare Depend On Us! ultramaxracing05's Avatar
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    Speed Issue

    I need some opinions, on my speed isssue.

    2000 XPL Pro-k rejetted,

    trying to tune before Mudbug
    52 MPH [email protected] 6,5000 +/- 66,000 RPMS


    could this be a prop issue?
    the prop is stock and the clearance is within specs,
    rideplate holes are filled, and intake grate is stock.

    thanks guys.


  2. #2
    jsirois831's Avatar
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    66000 RPMS! HOLY COW!!!!!!!!!!!! jk

    ummm i would think even jetted correctly with PROKs, you could/should be turning 6900...i know i have the same set up, but with a dynafly prop and 01 XP boat...i was only turning 6400-6500 then cleaned and redid the RAVES, pulling 6900 now....if your ballsy, and want to play with the Highspeeds, turn out a hair...i hear you can with the PROKs...i have mine turned out maybe 1/8 or a hair over, ran a plug chop, perfect color, and turning 6900..BUT if you do turn them out..MAKE SURE YOU CHECK THE PLUGS!!!!!!!!!!, you dont want to blow up the engine just to get more RPMs

  3. #3
    jsirois831's Avatar
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    although, i may be turning the high's back in..getting left hand turn syndrome, which is heard is a lean condition...so we'll see

  4. #4
    Work Harder, Millions on Wellfare Depend On Us! ultramaxracing05's Avatar
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    what jetting you running?

    I got
    167 Mains
    85 Pilots,
    and 2.0 NS

    I believe my rpms are low cause of a water leak in the pipe.
    the old owner had it drilled so there was too much water going in.
    I JB welded it, but I'm sure the pressure has leaked in.

    I will pressure test the exhaust pipe.
    and go from there.

  5. #5
    KrunchovXPL-GTX-RX's Avatar
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    1. It does not sound like the RAVEs are opening, or, as you think, the water in the pipe (though every one I have seen has knocked it down worse than this one).

    2. That is slow for 6600 RPM. That boat should run around 60ish and you are not going to gain 7mph in 3-400rpm.

    With the jetting I gave you it should be at, say .5 (front) and .75 (rear) turns on the highs. Even if you were at one turn out on both you would turn over 6900 with a stock prop.

  6. #6
    Work Harder, Millions on Wellfare Depend On Us! ultramaxracing05's Avatar
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    also when I bought the ski one of the vanes is totally gone on the pump.

    I dont think this could affect much......?

  7. #7
    Work Harder, Millions on Wellfare Depend On Us! ultramaxracing05's Avatar
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    Dan, what rave setting do you have on your XPL?
    How many turns in/out..
    and also the water regulator?

    thanks

  8. #8
    KrunchovXPL-GTX-RX's Avatar
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    The pump may not be doing anything to it. I just fixed one for a guy. The pump does have all of the vanes but the leading edge on each one is gone (one of them nearly half way down the thing).

    That pump runs his boat just as fast as one of my pumps with good vanes did. With the same jetting it is turning right at 7000 and 60mph on the GPS.

  9. #9
    Is your pump and shoe sealed good? If not, you may actually be cavitating a little bit up top giving you more rpm, and no speed. Bill O mentioned this to me a while ago with a problem on a friends gtx. I'm heavier than he and I was getting more rpm, slowed the ski down in the water, pump cavitated. Just a thought.

  10. #10
    KrunchovXPL-GTX-RX's Avatar
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    If he had enough slippage to slow it down as much as it is showing on the GPS I would expect it to turn on up to the rev limit (7100+). Once they let go it tends to spin on up, you see, as the load is off.

    He is not turning enough RPM, assuming the tach is remotely accurate.

    An XPL in that case would likely cav like a bastid out of the hole too since they have to fight up onto a plane in the best of times.

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