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  1. #1

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    What octane fuel for a stock 99' 951 xp

    I have done some searching with no real answers found. So I have a Stock 99' 951 xp and I was wondering what octane fuel I should run in it. I am new to ski's so bare with me.

    thanks in advance
    Ryan


  2. #2
    A good general rule to go by is if the compression ranges between 120 and 145 psi, 87 octane will be alright. Anything around 150 and up to 185 should have at least 90, anything above that and you're looking at racing fuel.

  3. #3

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    Quote Originally Posted by Schwarzenegger View Post
    A good general rule to go by is if the compression ranges between 120 and 145 psi, 87 octane will be alright. Anything around 150 and up to 185 should have at least 90, anything above that and you're looking at racing fuel.

    So with that said and me not knowing the compression of the cylinders, would it be wise and safer to run 93 octane for now until I check the compression

  4. #4
    Moderator RX951's Avatar
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    Quote Originally Posted by Schwarzenegger View Post
    A good general rule to go by is if the compression ranges between 120 and 145 psi, 87 octane will be alright. Anything around 150 and up to 185 should have at least 90, anything above that and you're looking at racing fuel.

    +1

  5. #5
    Just found it in the manual...regular 87 octane. Running higher octane is always a better bet anyway. It has a much more controlled flashpoint and will burn more efficiently. The lower the octane the more unstable it is and the faster it will ignite...which sometimes could be pre-ignition and your engine will run like crap. Have you ever heard a car ping and rattle...classic case of this garbage 87 octane the gov't has charged us to death for lol.
    Last edited by Schwarzenegger; 08-16-2008 at 06:02 PM.

  6. #6
    "So with that said and me not knowing the compression of the cylinders, would it be wise and safer to run 93 octane for now until I check the compression"

    --I've always ran 89 in my 2001 GTX. It's a carb 951. No problems whatsoever.

  7. #7

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    Just making sure... I know oh so well about knock and ping since I Race Turbocharged motors.

  8. #8
    I don't think there's much difference between a '99 951 and a '01 951, even the DI's (fuel injection) aren't much different. But mine's a stock carb 951, have ran it stock since new in '00 and never had any fuel issues with running 89 octane.

  9. #9
    89 is not too bad...87 is horrible. Now with the forced addition of ethanol to all the fuel, the quality has really gone down the drain.

  10. #10
    Yeah! LOL I wouldn't run that crap in my Doos!!! 89's probably getting as bad as that octane...but who can afford 2 run 91 at these current priceses??? Not me...91 goes into my Hemi! LOL

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