Remapping the 800GS to run on regular pump gas

Discussion in 'Parallel Universe' started by tipler, Mar 3, 2009.

  1. DiabloBlanco

    DiabloBlanco Intl' Hops Inspector

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    Random note
    I had thought about getting the computer remapped before a South to Central to North America ride... wound up not remapping it and not needing it, high octane was available everywhere
    #21
  2. LaPorte

    LaPorte Been here awhile

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    I will soon be getting my 2010 f 800 GS and I was woundering about the premium fuel requirment. Specially if you do a Mexico/Baja trip. I have a KTM 450 EXC and the book says to use hi octane fuel. I have run both premium and regular and have not noticed a problem, nor have I unpluged the mapping wire. Yes it's carbureted, but high compression is hi compression. I would think a tank of regular fuel now and then in the f 800, if you had to use regular, wouldn't hurt. I wouldn't run regular as the only fuel. There is always octane booster.

    LaPorte
    #22
  3. DiabloBlanco

    DiabloBlanco Intl' Hops Inspector

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    No a tank here or there of regular wouldn't be such a bad thing, but you shouldn't have a problem finding high octane in Mexico... They have their fair share of Audis and BMWs and high end cars on their roads as well...
    #23
  4. sturgeon

    sturgeon Long timer

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    Judging from their FAQ, I'd say probably not. It seems to involve re-flashing the ECU, and since that has a limit on how many times it can be done over its lifetime, they seem to be saying no way to that feature.
    #24
  5. Camel ADV

    Camel ADV Long timer

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    I had mine remapped. Haven't noticed a loss of power or increased fuel consumption. Currently 17,000km into RTW trip and have averaged 4.2L/100km (figured out on paper not the trip computer). No idea what octane some of the fuel was as it was poured out of 4litre oil jugs from behind some guys house. The bike ran great, no issues at all. I'm pretty happy with that mileage considering the varying terrain, speed, fuel quality and altitude not to mention the bike is fully loaded (over 800lbs with rider).
    #25
  6. Full Power

    Full Power Long timer

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    90 Octane premium fuel is unavailable over most of Alaska. Only cities, and paved roads have premium.
    Dealer talked me OUT of re-mapping the F800, said it would be un-necessary.
    When possible, I fill with 90 octane, but had to run 87 for a thousand miles, one weekend.... with no audible harm ( Bike runs great, not sure HOW it can get by on 87 octane with 12 to one compression, but it, apparently DOES. )
    #26
  7. too old for dirt

    too old for dirt Been here awhile

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    Did re-map on my 2012. Noticed a slight loss of power, but still more power than I need. Did not notice any change in milage. Still 50/51 mpg.

    Use it to ride TAT and there are many places where Hi test is not available.
    #27
  8. Full Power

    Full Power Long timer

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    Here is a question for those that HAVE Re-mapped an F800 for low octane:
    ... Anyone returned their bike to the HIGH-Octane map, and noted any functional change ?
    Thanks..
    #28
  9. SOP Dirt-Rider

    SOP Dirt-Rider Been here awhile

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    FWIW, higher octane results in lower BTUs/available energy. The increase in performance comes from the higher compression of the engine itself, not the fuel. IOW, remapping will have no effect. Altering timing may have the desired effect. A simple solution would be to carry along the appropriate octane booster and add as needed. Do your own research here as some of the boosters just aint.
    #29
  10. Bayner

    Bayner Long timer

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    I've considered switching mine back, but in reality I just don't see the point. If there's a performance loss it's not in the RPM range I typically run around at...
    #30
  11. SOP Dirt-Rider

    SOP Dirt-Rider Been here awhile

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    Just what is the purpose of higher octane? To prevent premature ignition. The tighter the squeeze, the higher the octane. We do not want ignition to happen before the compression stroke is complete, one way to control this would be to adjust the valve timing, decreasing compression. This would require a differant cam. Another method would be to delay when the fuel is injected, but that would be finicky at best. Both would result in a loss of performance as it is circumnavigating the benefits of higher compression.
    Another option, and no, I am not slamming the F8GS, would be to buy a bike that doesn't require the higher octane. Performance comes at a cost, not always in a dollars and cents manner.
    #31
  12. AK650

    AK650 Been here awhile

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    In our emissions conscious environment, getting performance via high compression is a fact of life, unless you do it via large displacement, which is counterproductive, if you want a lighter, off road bike.

    I suspect the BMW low octane remap, primarily just pulls timing, just as the ECM in a bike with spark knock detect does. While it would almost have to degrade performance to some degree, I doubt it's anything earth shaking.

    Jeff
    #32
  13. Full Power

    Full Power Long timer

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    Thank you.
    That is the EXACT type of data-point I am looking for.
    #33
  14. BlueRidgeKat

    BlueRidgeKat Daily Commuter

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    Interesting thread. My wife has a F800ST which like the GS calls for supreme fuel. We have a Marathon station near home that has regular 87 octane, supreme 93 octane and a mid grade ethanol free 90 octane. I would like to use this ethanol free fuel. You guys are the experts.... is the 90 octane close enough to supreme? We tried a tank and she couldn't tell any difference but not sure if we should use it all the time.
    #34
  15. FredRydr

    FredRydr Danger: Keep Back 300 Ft.

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    Since your engine doesn't need premium in that high elevation region, why not just add higher octane available from gas stations at lower elevation when you drop in elevation?

    Fred
    #35
  16. jttele

    jttele Been here awhile

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    If it's the same recommendation as the GS, then yes, the 90 octane is fine. BMW calls for 89 octane in the GS. The Ethanol free in the 90 octane is just another benefit for you. I sure wish I had a station in my area with Ethanol free! That crap is complete bulls*** it, besides the loss of mileage with it, it almost got me killed when it caused the fiberglass tank on my Cagiva to melt and the resultant goo to stick my carb slide wide open.
    #36
  17. JRose

    JRose Been here awhile

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    Put 87 in my '13 this past week, no I'll affects.
    #37
  18. CheckerdD

    CheckerdD Long timer

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    I considered remapping my 2010 800 before going to South America in 2012. But I did not do it and gas in places like Mexico or Argentina is better than gas you can get in the US because it aint diluted with ethanol. Bike runs smoother with a slight but noticeable increase in power on 100% gas than our 90%. Exxon, BP and Shell don't forget how to refine gas just because they are doing it in a third world country. Poor third world gas is a common misconception. I am doing Russia next summer. Everyone I talk to says it's 93 octane the whole way. So my vote is against remapping. Dave
    #38
  19. lakota

    lakota Geeser

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    Just remember that 93 octane in Europe is not the same as 93 octane in US/Canada
    #39
  20. RexBuck

    RexBuck Long timer

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    When I did my trip around Mexico a couple of years ago there was a couple of occaisions when I couldn't find premium. Bike ran fine but I did notice a bit of pinging when it pulled hard.

    Had it mapped for Regular before my South America trip and I would estimate that I lost a small amount of gas mileage . . . maybe 1 or 2 mpg. No pinging problems with lower octanes though.

    I still use premium when I can but regular works just fine on occaision. Actually, finding gas without ethanol is a bigger plus for me.
    #40