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  1. #1

    Running 91 octane fzs

    I know that yamaha reccomends 87 due to the low compression of the motor. However I wasn't sure if anyone has been using 91 and thought it worked well. Just curious about this. This is on an fzs


  2. #2
    Bounty Hunter Carlos Thomas's Avatar
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    Better fuel is never a bad thing. I don't go cheap on the fuel. Since I started with a Honda, I am used to putting in 91. I only put in 87 if I am on the water and they have nothing better.

  3. #3
    MPower's Avatar
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    Zero reason to run anything higher than what is recommended for your motor.

  4. #4
    Looped's Avatar
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    I'm not going to go in to all the details here ...just google it but higher octane gas is ONLY used to burn slower for higher compression. There is no benefit other than that. no extra special additives (that really do anything) despite Gas company claims.
    If anything, I have read reports of higher octane fuel actually having less power per volume than regular. So... If it is not required and your not pinging, don't bother, unless of course you just like paying 50cents more a gallon than you need to.
    Now if you need 91 or more for pinging at 11:1 then of course it will be more powerful in that situation. Not because the gas is more powerful, just that you will be burning it at the right time.
    *Note--if you raise your boost eventually you WILL need to run higher octane...but stock, no.

  5. #5
    Looped's Avatar
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    Hey I just found this at Minnesota Dept of Commerce's site.
    it's a good, quick read and I think everyone should know this stuff.

    http://www.state.mn.us/mn/externalDo...ctaneFacts.pdf

  6. #6

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    Quote Originally Posted by Looped View Post
    Hey I just found this at Minnesota Dept of Commerce's site.
    it's a good, quick read and I think everyone should know this stuff.

    http://www.state.mn.us/mn/externalDo...ctaneFacts.pdf
    I am being using PREMIUM in my FSZ without any problem, but, after reading this, going back to Regular until I do the C3 and the 15/25 impeller

  7. #7
    SHOBiz's Avatar
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    Quote Originally Posted by pituco View Post
    I am being using PREMIUM in my FSZ without any problem, but, after reading this, going back to Regular until I do the C3 and the 15/25 impeller
    I tried Premium prior to installing a C3 last year and also saw no benefit that was worth the additional cost. That was also during the time when Regular was well over $3 a gallon...

  8. #8
    Taking money away from the Z06 Fund
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    If you aren't running additional timing or more boost, there's really no need for Higher Octane fuel. As others have said, if you run a higher octane fuel, it may cause you to actually slow down somewhat if you are stock or close to stock.

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