I don't understand this RON/MON stuff...

Discussion in 'Parallel Universe' started by Apostolos, Apr 10, 2010.

  1. Apostolos

    Apostolos Been here awhile

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    The manual says RON 91, 89 AKI,(95 ROZ/RON)...

    I have no idea what any of that means and I don't feel like trying to figure it out.

    Who wants to help me be lazy and give me the answer? When i go to the pump what octane should I select here in California, e.g., 91, 87, etc.?

    Thanks.

    God Bless,
    David
    #1
  2. Denalidirt

    Denalidirt High Plains Drifter

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    go with the 91, any higher than that your wasting your money.
    #2
  3. raider

    raider Big red dog

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    Wikipedia is your friend here - part of interest to you highlighted in red :deal

    So, if the manual calls for 91RON, and you live in the United States, use the pump labelled "89". The F800GS calls for 95RON, which would be labelled "91" on the pump in the US.
    #3
  4. The Griz

    The Griz Long timer

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    Also, if you remove the seat and look back in the open cavity where the rider's manual fits, there's a sticker. This sticker has some standardized information about the bike, including what the AKI should be for the fuel. It says use minimum 89 AKI.
    #4
  5. raider

    raider Big red dog

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    Really? In Oz, it calls for min 95RON (91AKI), unless you have the "optional 91RON fuel map" (which is a two-second computer recode by the dealer, and knocks 2kW off peak power according to the BMW Australia spec sheet). I hope that something like the GS-911 Pro will allow this to be done at home, but I currently have a good dealer who will do it for free if I'm heading out bush where only crappy fuel is available.

    The implication would be US-market bikes are shipped with this recode already done, and hence could have the better (more powerful, higher compression) map selected as an upgrade?
    #5
  6. DolphinJohn

    DolphinJohn Caveman

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    Just an FYI, while out in the rural USA I ran many tanks of "87 octane" as that was all that was available. I never noticed any difference at all. No power loss, no pinging. I rode at various elevations to over 13,000 ft.
    #6
  7. Apostolos

    Apostolos Been here awhile

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    So what I'm reading here is that 91 octane in the United States is what's recomended for the F800gs. Correct?

    My manual says RON 91 as OE (optional equipment), and then is says, 89 AKI (95 ROZ/RON) super unleaded.

    91 octane is what's recommended? Thanks.

    God Bless,
    David
    #7
  8. PackMule

    PackMule love what you do Super Moderator

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    My fuel filler says Min 89 octane (AKI).



    Out west at higher elevations you'll often find 85 octane as the "low octane" selection at the pumps. Because of the lower pressure at elevation, you can run lower octane w/o problems (compared to sea level).
    #8
  9. raider

    raider Big red dog

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    No, other way around. If it's recommending "89 AKI", then choose the pump with 89 written on it (in North America).
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  10. Apostolos

    Apostolos Been here awhile

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    Sorry if I'm trying your patience, but earlier you said, "if the manual calls for 91RON, and you live in the United States, use the pump labeled 89."<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:eek:ffice:eek:ffice" /><o:p></o:p>
    <o:p></o:p>
    I believe the manual is calling for 89 AKI (95 ROZ/RON). <o:p></o:p>
    <o:p></o:p>
    Given that information you said, "If it's recommending "89 AKI", then choose the pump with 89 written on it (in North America)."<o:p></o:p>
    <o:p></o:p>
    How can 89 AKI and 95 ROZ/RON both equal 89 octane at the pump when you said earlier that 91 RON called for 89 octane? Sorry I've made this so convoluted.<o:p></o:p>
    <o:p></o:p>
    God Bless,<o:p></o:p>
    David<o:p></o:p>
    #10
  11. raider

    raider Big red dog

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    Sorry, I mis-read your post above. You have the same arrangement as me: the higher octane is standard, lower octane is an optional map. I mis-read that and thought it might be reversed.

    You're correct - you need the 91 pump.

    Although, as someone above mentioned, the bike is equipped with knock sensors and variable ignition timing, so using lower if it's all you can buy won't hurt.
    #11
  12. Apostolos

    Apostolos Been here awhile

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    Thanks for the help. 91 it is.

    However, I thought I read somewhere that knock sensors were not configured into the F800gs design?

    God Bless,
    David
    #12
  13. raider

    raider Big red dog

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    Knock sensors, O2 sensors, EGT sensors, CHT sensors... they all achieve the same thing (monitoring combustion) via different methods. I don't know what particular sensors the 800 has, but experience says it will cope with low-octane fuel without knocking, exploding, or turning into a KLR.
    #13
  14. Apostolos

    Apostolos Been here awhile

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    Thanks again.

    :D I just sold a KLR to help purchase the F800gs I just rode home form the dealers yesterday. They certainly are two different beasts that's for sure.

    God Bless,
    David
    #14
  15. raider

    raider Big red dog

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    Great choice! I bought the 800 sort of on impulse, and now sleep on the couch until the Wee is sold :)
    #15
  16. Bucko

    Bucko In a parallel world

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    There is no anti-knock sensor in the GS8 as there is in the GS12, so it won't adjust ignition timing based on fuel quality and will ping if you run crap fuel. That's why there's an optional mapping available from your dealer for low octane fuel. :deal
    #16
  17. reinerka

    reinerka Been here awhile

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    I agree, one of our KLR's had to make space for the F800GS as well - I'm not missing it at all :D .

    Reiner
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  18. Apostolos

    Apostolos Been here awhile

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    Having owned both the KLR and F800gs, my observation would be this:

    KLR650 =

    [​IMG]

    F800gs =

    [​IMG]

    God Bless,
    David
    #18