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  1. #1

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    03 GTX SC, supercharger question

    My 03 GTX SC (with Solas 12/20 impeller, 50 hours on ski) is only turning about 7400 RPM's, and from what I've read here, it should be closer to 7600.
    I pulled off the inlet hose to the SC, and tried to spin the impeller, I can get it to move about an 1/8", but that's it.
    I can also move it in and out just a bit, enough to make it click.
    There was a film of oil inside the hose also, but that could of been leftover from the winterizing the throttlebody.
    I also seem to be using a little bit of oil.

    Opinions?


  2. #2

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    all sounds normal. as you can't rotate it the clutch is still holding. When the clutch goes revs will drop down to around 6000 rpm.

    stabs

  3. #3
    skipSC's Avatar
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    Usually with the 03's, it is a worn wear ring that causes drop in RPM of that much. Especially if it is the old plastic pump.

  4. #4
    Married the love of my Life Mayday 2008 SuperCharged03's Avatar
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    I too have an 03 and had those problems. I upgraded to the 04 aluminum pump to stop the wear ring from always wearing out so fast and the pump flexing.

  5. #5

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    Quote Originally Posted by skipSC View Post
    Usually with the 03's, it is a worn wear ring that causes drop in RPM of that much. Especially if it is the old plastic pump.
    I replaced the pump with a brand new metal one about 20 hours ago.

  6. #6
    Focker Foggy's Avatar
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    If your speed is acceptable at 7400 then you are just fine.
    If you don't have many mods, the 12-20 will not usually pull
    more than 7200 out of the box w/o a little tweaking...
    I my opinion, I think you are fine..
    the lower rpm's will be a little easier on your engine in the long
    run anyway.
    You could always send the impeller off to have it tweaked
    to get 100-200 more rpms
    I played with a couple of 12-20 props to find the sweet spot
    on my 03.

  7. #7

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    Quote Originally Posted by Foggy View Post
    If your speed is acceptable at 7400 then you are just fine.
    If you don't have many mods, the 12-20 will not usually pull
    more than 7200 out of the box w/o a little tweaking...
    I my opinion, I think you are fine..
    the lower rpm's will be a little easier on your engine in the long
    run anyway.
    You could always send the impeller off to have it tweaked
    to get 100-200 more rpms
    I played with a couple of 12-20 props to find the sweet spot
    on my 03.
    Thanks for all the reply's, It seems to go ok, but when I read that it should be around 7600, I thought I might have a problem.

    Foggy, I see you have a 2.5 wedge on your 07 RXT, I also have the same ski, and bought a 2.5 off ebay over the winter for a great price, but have not installed it yet, does it make a difference?

  8. #8
    Focker Foggy's Avatar
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    I never rode the ski w/o the mods.. bought and modified over
    winter...
    It made a real nice difference on my 03 gtx sc and 02 gtx di,
    so I figured I'd just doo it!

  9. #9
    lextoy's Avatar
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    yes wedge is great!!!!!

  10. #10
    mjammer's Avatar
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    Your setup is in the right ballpark. Air and engine temp has a lot to do with the max RPMs. I hit a little over 7600 early spring and by the heat of the summer as the day wears on, I am usually down at least 100 RPMs even with the Riva Air Filters, etc.

    One thing to check is your oil level as well. It will pull your RPMs down some too. It should be at the mid point between the bends at most for optimum perf.

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