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  1. #1

    only 10psi on ultra 2009 ultra260x HELP!

    ok i've read a couple threads on this relating to this boost issue, but nothing i tried helped

    the ski: 2009 Ultra260X
    riva intake, exhaust with aftermarket waterbox, intake grate

    the problem: 10PSI off water and in water it launches at 10psi then drops to 8psi and holds at 8psi for the entire run.
    max rpm is 7400 on the water, 8400 out of water - engine sounds nice and clean

    what i tried:
    checked all boost hoses - yes i did it properly, more than once

    checked exhaust and intake hoses

    removed the intercooler and did a gas flush- it had a good amount of oil in it, from this one time it flipped

    changed plugs

    changed OIL

    swapped Blowoff with one from an ultra250

    removed supercharger - everything inside looked perfect not a scratch and it spins freely

    changed supercharger belt- changed tensioner as well because of a bad bearing, belt is tightened

    removed and blocked off valve on intercooler- now when i tried this today on launch i'm seeing boost over 13psi just for less than a second then i get a check light F1. if i restart the ski the check light would be off, then when i launch same problem but the 13psi happens in the blink of an eye and drops to 8psi with the check light, removed block off and put back oem valve and it works fine with no check light
    could it be overboosting? and throwing a check light?

    can anybody help me?
    just a month ago everything was working fine
    9000rpm out of the water
    8400rpm in the water
    12psi boost
    ^ figures may not be exactly like those, but from what i recall


  2. #2
    Take the time to smile sirbreaksalot's Avatar
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    "can anybody help me?
    just a month ago everything was working fine
    9000rpm out of the water
    8400rpm in the water
    12psi boost
    ^ figures may not be exactly like those, but from what i recall "
    What pullies are you running

    what code is the FI light

    to check the fault code while its in FI mode
    push and hold both button for 3 seconds or more
    then the display will show code

    Waz

    yes your old numbers are WRONG

  3. #3
    havent checked the code

    will try it later this week and let u know

  4. #4
    Formerly Ultra250 TN Aquaholic6801's Avatar
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    If you are revving it up to 9000 rpms out of the water then thats your problem (DO NOT REV ANY SKI THAT HIGH WHEN OUT OF WATER )......I had drop in boost problem (last year) right before my supercharger locked up, would show 12.8-13 lbs boost then drop back to 11ish lbs at WOT....there was a slight ticking noise also...hard to hear but when you have put a lot of time on a ski you hear things like that......................

  5. #5
    UltraKvz's Avatar
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    Quote Originally Posted by drift View Post
    ok i've read a couple threads on this relating to this boost issue, but nothing i tried helped

    the ski: 2009 Ultra260X
    riva intake, exhaust with aftermarket waterbox, intake grate

    the problem: 10PSI off water and in water it launches at 10psi then drops to 8psi and holds at 8psi for the entire run.
    max rpm is 7400 on the water, 8400 out of water - engine sounds nice and clean

    what i tried:
    checked all boost hoses - yes i did it properly, more than once

    checked exhaust and intake hoses

    removed the intercooler and did a gas flush- it had a good amount of oil in it, from this one time it flipped

    changed plugs

    changed OIL

    swapped Blowoff with one from an ultra250

    removed supercharger - everything inside looked perfect not a scratch and it spins freely

    changed supercharger belt- changed tensioner as well because of a bad bearing, belt is tightened

    removed and blocked off valve on intercooler- now when i tried this today on launch i'm seeing boost over 13psi just for less than a second then i get a check light F1. if i restart the ski the check light would be off, then when i launch same problem but the 13psi happens in the blink of an eye and drops to 8psi with the check light, removed block off and put back oem valve and it works fine with no check light
    could it be overboosting? and throwing a check light?

    can anybody help me?
    just a month ago everything was working fine
    9000rpm out of the water
    8400rpm in the water
    12psi boost
    ^ figures may not be exactly like those, but from what i recall
    GPS speed???

  6. #6
    no gps speed yet...

    but it feels slow...

    my ultra 250 is much faster now than this ski

  7. #7
    UltraKvz's Avatar
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    Mine showed 10 psi but I could outrun other stock ski's. My boostgauge was faulty. Riding in very hot condisions my rpm's drop a few when heat builds up in hull. I fitted a thermometer infront of the airhorn and beleive me the temp inside builds up quick.

  8. #8
    yea thats not the case with me though

    my ultra 250 is much faster

    my ski feels much slower than usual

    so its not the gauges

  9. #9
    brisyl's Avatar
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    have you check your code?

  10. #10
    i have to block off the valve on the intercooler before i can get the code again

    i'll do that tomorrow afternoon when i get the time

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