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  1. #1
    imp0ster's Avatar
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    8.5psi @ 8k X-SC

    First time out with the 15/20r, 83mm ring, and I do love the prop. Right off the bat it hit 8k. Air was low 90s, water water was 82, IAT was 95, WOT AFR was 12.1. This was with some good heat soak. I should have ran it a bit after the startup.

    Is this a normal psi for 8k and a X-sc? I know that revs affect boost and boost affects revs. They feed off each other. I'm wondering if I put a 84mm ring in if it will get me the extra 1050RPMs and 1.5psi
    Last edited by imp0ster; 05-20-2013 at 08:26 AM.


  2. #2
    SLASHER's Avatar
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    That's about right ...

    I did a 4 inch rear intake and moved the IC close to the intake mani with solid pipes and then saw 10psi at 8040rpm on a friends RXPX ..,

    More RPM will give u extra psi ...

  3. #3
    imp0ster's Avatar
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    thanks! I run solid piping. I just redid the SC side so it's more "relaxed" and at a better angle. I think the hot FL water and air is getting to my sled.

    But by your numbers I am off 1psi at least. I need to buy a CDI torque wrench and check slip I guess. Brand new I had to put 1 shim in to hit 140 inch/lbs. The one tool I don't own is the dial torque wrench

  4. #4
    shrabber's Avatar
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    8k is good for our Florida heat (stock ecu) what concerns me is the 8.5 PSI. Your afr's are good You getting 8,000 rpm's quick I doubt there's any boost Leaks, I would Focus On your supercharger. Recheck your slip 8.5 lbs at 8k rpm is low for a x charger you should be a 10 PSI. IMO Your setup is pretty good 12.1, 8k with 83 ring I would focus on getting your Boost to 10 lbs and you will be on the right track

  5. #5
    Water4fire's Avatar
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    What type of boost gauge?

  6. #6
    imp0ster's Avatar
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    A very big one lol.


  7. #7
    Moderator beerdart's Avatar
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    Borrow Abomb's boot gauge you will pick-up a few psi.

  8. +1 by:


  9. #8
    imp0ster's Avatar
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    lol I don't need 18psi

  10. #9
    ADAMBOMB's Avatar
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    Quote Originally Posted by beerdart View Post
    Borrow Abomb's boot gauge you will pick-up a few psi.
    Dick
    Sounds like someone is drinking on the job...Whats a boot Gauge? Make sure you slip is set correctly and dont have any boost leaks..

  11. #10
    ADAMBOMB's Avatar
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    Quote Originally Posted by imp0ster View Post
    A very big one lol.

    Thats a little excessive for a ski. sell it and get the one that reads 20. Then switch it when u say screw it and go turbo


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