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  1. #1
    gmoeller's Avatar
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    Can I add 100 octane to 87 oct. to raise the octane level to be safe after new mods?

    My mods are done.... but.....

    I ran with 87 octane before mods in signature below. I now have the mods installed, and I know that I should be using 91 octane. Questions is can I add 100 octane to the 87 octane to raise the octane level.... or do I have to run (or drain) the 87 in the tank now till its close to empty? Or can I run the ski with 87 till its empty and then add 91. Just trying to think outside the box.... it would just be easiest to add 100 octane. I just don't know if this would work.

    I have about 1/2 tank of 87 octane in the tank now.

    Gary


  2. #2
    hitman's Avatar
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    In general, yes, you can do that. I would stick with unleaded fuel though.

  3. #3
    SHOBiz's Avatar
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    Personally I would not be to worried about it as long as I was not doing wide open runs.



    Take a look at some blending charts.
    This is an example from one site I visit...
    http://www.planetporsche.net/cayman-...nd-charts.html

    For half a tank of 87 I am thinking 6-8 gallons of 100

  4. #4
    Mod less, ride more! troyheb's Avatar
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    I would just add the 100 octane, you should be fine. I will let everybody in on a secret, the refiners ( all the ones I deal with anyways ) dont make mid grade gasoline, they blend regular and super to make the mid grade octane for your area.

  5. #5
    use2vtec's Avatar
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    You will be fine just be sure you mix it properly. Im pretty sure 100 is still unleaded so you will be good go go!!

  6. #6
    Mod less, ride more! troyheb's Avatar
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    Quote Originally Posted by hitman View Post
    In general, yes, you can do that. I would stick with unleaded fuel though.
    Yea forgot about that, alot of the high octane fuel is still LEADED.
    Last edited by troyheb; 10-12-2009 at 11:56 AM. Reason: sp

  7. #7
    gmoeller's Avatar
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    GREAT. So I don't have to worry about over "octaning" it. In other words, putting TOO much race fuel and running it with too high of an octane level?
    I will make sure it is unleaded if I do it.... and if I don't, I will not do wide open runs until I have run the 87 out of the tank, then add the 91 octane..... and then LOOK OUT!

    Thanks guys.... really appreciate it. Great info as always.

    Gary

  8. #8
    gmoeller's Avatar
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    Quote Originally Posted by SHOBiz View Post
    Personally I would not be to worried about it as long as I was not doing wide open runs.



    Take a look at some blending charts.
    This is an example from one site I visit...
    http://www.planetporsche.net/cayman-...nd-charts.html

    For half a tank of 87 I am thinking 6-8 gallons of 100
    Sorry....Thanks SHOBiz. I missed this chart the first time.

  9. #9
    SHOBiz's Avatar
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    Quote Originally Posted by gmoeller View Post
    GREAT. So I don't have to worry about over "octaning" it. In other words, putting TOO much race fuel and running it with too high of an octane level?
    I will make sure it is unleaded if I do it.... and if I don't, I will not do wide open runs until I have run the 87 out of the tank, then add the 91 octane..... and then LOOK OUT!

    Thanks guys.... really appreciate it. Great info as always.

    Gary

    If you have half a tank of 87 na.. not a problem to add 100. I wouldnt run 100 by itself with out a map for it tho.

  10. #10
    i will get all the rest i need when im dead corkycat's Avatar
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    it doesnt matter what grade of fuel you put in your ski if it is from the filling station it will run fine with them all (just dont use diesel)
    there is minimal to show between the two. also the chart above shows race fuel, not pump fuel so this is no good for pump gas but its a good base chart if you are mixing race fuel... i work for shell fuels offshore

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