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  1. #1

    Ultra 300x top speed

    Hi guys just wondering what is the norm for a completely stock 300x with limiter in place my speedo is saying 67 but my gps 64 and I seem to be getting smoked is this correct? Also top rpm logged is 7340.


  2. #2
    ULTRA3N's Avatar
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    you should be hitting around 7490 rpms and i have gps'd mine to 67.6 mph. And i think you are reading your rpms from the stored data. To determine your actual max rpms you have to look at them when doing a top speed run. How many hours on the ski ?

    Chad

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  4. #3
    Ski has 69 hours now I've got 160 psi on 1,2,3 and 170 on number 4 that's with a cold engine, I just dunno why my gos is 64 and the dash is 67 cos I'm guessing the ski is limiting it to the 67 the dash is displaying?

  5. #4
    ULTRA3N's Avatar
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    well i would say next time your out have a look at your actual rpms when going full throttle, not from the stored data. But yes i understand sometimes the ski will not be running a constant 67 and that was sometimes the case with mine. The limiter can really hold it back, like your hitting a brick wall, and it might hold the ski back a little more than it should. Try doing a top speed run with the trim one above neutral, doing this made me see a constant 67.

    Chad

  6. #5
    Thanks chad I'll give it a try, wht did you do to get over it? Install the scom? I wonder if my speedo wheel is over sensitive I dunno what else it can be cos if it's 67 on the dash that's gonna be it right? It doesn't hardly feel like its being held back either.

  7. #6
    ULTRA3N's Avatar
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    nah no scom yet, trying to keep it stock till my engine warranty is over around early next year. The dash isn't exactly very accurate because i know mine can jump around from 60 to 67 mph when doing a top speed run. The only way to know your true speed is to use a gps. Yours may not be held back as much as mine quite possibly because i have the solas 14/21 installed so i guess that prop wants to make the ski go more than 67 so my speed gets brought down a fair bit till it steadies out at around 67.

  8. #7
    r33pwrd's Avatar
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    You are not in Washington are you?

  9. #8
    No I'm not in Washington, why do you ask?

  10. #9
    "just sayin".. jetdave56's Avatar
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    How bout a good check of clamp hoses on SC and IC and maybe its time for a IC cleaning and exhaust filter inspection..seems to be the common lose of speed and rpms on the 300...btw get full boost (16lbs)?

  11. #10
    Quote Originally Posted by Timmymajic View Post
    Ski has 69 hours now I've got 160 psi on 1,2,3 and 170 on number 4 that's with a cold engine, I just dunno why my gos is 64 and the dash is 67 cos I'm guessing the ski is limiting it to the 67 the dash is displaying?
    Correct. I just broke in a new 300 motor over the weekend, and without SCOM installed my dash read 67 and three different GPS units gave readings from 64.5 - 65.6, which is when the limiter kicked in. The stock speedo wheel is not as accurate as GPS and reads a bit on the high side.

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