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  1. #1
    MartinP's Avatar
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    Question Macboost Stage 2 Kit R-12X is "slow"

    Hi!

    First post on this forum. Try to find some help with my aquatrax R-12X 2007.

    Bought it last year got 120 hours right now on the meter.

    It has complete stage 2 Macsboost kit excluding the wedge that i did not like.

    I think there is some fault somewere on the PWC.

    I have searched this and pwctoday forum without any luck. or at least looked for the issues of those problem that people had.

    My friend has a -07 r-12x as well and mine and his are exactly the same except for mine is a little faster spool-up time on the turbo. but top speed and acceleration is the same.

    I need some things to look for that normaly is wrong.

    I run 98 octane fuel (Swedish highest standard) water temperature is below 68 Fahrenheit. clearance of the impeller is less then 0,015 inches. WGS is working. I have seen the speedometer up to 120Km/h (i know it is not a correct to look at). New oil (5w-40), new plugs. New oilfilter.

    I have tested 17,5psi and 19psi restrictor hoses. On the 19psi it worked at first, then after a wholeshot it became a little slow. it works on 75% of thottle but after that and up to 100% nothing happends, it became slower or did not increase in speed.

    After a day i dismounted the intercooler and intake manifold plenum, found some residues of water and oil. Oil could be the PCV valve that it was to high level of oil at some point before the stage 2 kit was mounted, will be cleaned and tested again.

    Sorry for my english, is´nt the best sometimes


  2. #2
    NOIDEA's Avatar
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    What is your RPM on wide open throttle?

  3. #3
    MartinP's Avatar
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    6400-6450

  4. #4
    NOIDEA's Avatar
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    There is nothing wrong with your ski mate. You are on the limiter, you will have to re pitch your impeller to get more speed. Try something like 18/30.

  5. #5
    MartinP's Avatar
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    Is it that my friends ski if really fast as a stock unit, sounds like a Stage 2 kit should do the trick but i dont know

  6. #6
    NOIDEA's Avatar
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    I’m sitting in the same boat. Also did allot of upgrades on my ski with no real difference in top speed. Although my ski accelerates allot faster now the top end is about the same. I also need to re pitch my impeller. The problem is that no matter how much power you make the ecu will limit rpm’s to 6500.

  7. #7
    MartinP's Avatar
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    Then it is an acceleration question for me. that it is not as fast as it should be.

    Got no damage on the impeller. and the clearence is tight, within the service limit at least.

    From the Service manual: Impeller clearance 0.3 – 0.5 (0.01 – 0.02) 0.9 (0.04) (Mine is below 0.015 or 0.4mm)

  8. #8
    NOIDEA's Avatar
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    Do you have a boost gauge on your ski?

  9. #9
    MartinP's Avatar
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    Will be bought today, was the next thing to verify

  10. #10

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    That is strange, stage 2 kit on a R-12x should be really quick. i have the F12x with just the solas impeller and it has way more punch than the stock impeller.

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