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  1. #1

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    High Octane Fuel

    This week i will be taking out my ski with a buddy of mines who has a couple gallons of 110 octane unleaded & 118 octane leaded sitting in his garage. I was wondering if anyone have any feedback/suggestions on these higher octane fuel in the GP1300R 150psi? Thanks in advance


  2. #2
    Happily Self-Employed WFO's Avatar
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    its a waste unless you have high compression

  3. #3

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    The way it was explained to me:

    11 gallons of 93 octane gas + 1 gallon of 110 octane

    11 gallons x 93 octane / gallon = 1023 octane + 110 octane = 1133 octane

    1133 octane divided by 12 gallons (total) = 94.47 octane/gallon

    It might have a little more zing at 94.5 octane and 150 psig, but more than a gallon in a full tank is a waste.

  4. #4

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    "octane" =/= power

    Higher octane fuel has less energy per unit volume. Octane is a measure of a fuels ability to resist pre-ignition (detonation, ping, etc.). Higher octane fuel is less volatile. If you run 93 octane in something built for 87 octane, you will make less power.

  5. #5
    PolarisNut's Avatar
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    Yup, no need in a 150psi single pipe ski. My triple pipe boat actually started gaining RPM when I started mixing less and less race fuel in it. I keep it at about 10% still, just for the safety factor.

  6. #6

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    Thanks for the feedback guys. I figure i asked since my buddy has couple gallons just laying around. But good to know its not needed. Im just going to stick to 91 Octane

  7. #7

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    Also, depending on what kind of "race gas" you're running, you may have to jet richer. Methanol and Ethanol have to be run much richer to achieve a stoichiometric air/fuel ratio. Just switching over to "race gas" that includes a high quantity of alcohol (methanol is typical in race fuel) may cause you to run leaner. But, alcohol burns cooler, too, so that might not cause a problem.

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