F800GS Snatchy Throttle Fixed!

Discussion in 'Parallel Universe' started by jessehere, Jun 5, 2009.

  1. Maddaddy

    Maddaddy Greg

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    I've read others that have had their bikes remapped for the lower octane.

    I called and scheduled to have mine done this Friday.

    The tech advised me that this will reduce HP greatly.

    They also warned me that it may all not take the re program

    I will be the first they have done at SSBMW.

    We shall wait and see.
    #41
  2. Ducksbane

    Ducksbane Quaaack!!!

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    :lurk
    #42
  3. Magile

    Magile "What exit?"

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    will look like this -

    [​IMG]

    I had mine re-mapped at the first service and never missed the extra HP above 7,000 rpm. When traveling backroads, I didn't want to fret if 87 or 89 octane was the only fuel available.

    Cheers, M.
    #43
  4. Y E T I

    Y E T I Unpossible

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    This brings up an interesting point: I thought 89 was ok to run in our bikes. Wrong? Should I be running 91??

    Maybe that's why my mileage is so piss poor?? :dunno
    #44
  5. Magile

    Magile "What exit?"

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    I routinely get 220-240 miles per tank-full on 87 octane. How far does your's go? - M
    #45
  6. Y E T I

    Y E T I Unpossible

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    :cry I've never pushed it but 200ish.
    #46
  7. JoelWisman

    JoelWisman Long timer

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    I have done this before, on my dealerships owners bike as a test.

    Be advised. The BMS-K has exactly 13 slots for software uploads beyond the orignal, after this, your stuck with whatever you have unless you buy a new BMS-K.

    Updating the firmware on the BMS-K requires one slot. A remap for low octane fuel is an update to the latest firmware and will require one slot. Switching from the latest low octane map to the latest normal octane map will require one slot.

    I can't see BMW ever releasing more then half a dozzen updates, but each update you choose to get will take a slot and each toggling between low and normal octane maps will take a slot.


    I long ago switched to the latest firmware normal octane map and it helped quite a bit with snatchyness. Neither the latest normal octane map nor low octane map will help with the on throttle to off throttle engine breaking, but both of the latest normal and low octane maps retard timing for half a second when going from no throttle to light throttle. This does help.

    Dave (owners) bike felt very snatchy when I first rode it, here are the steps I took and my impressions.

    1: Adjusted throttle cable from BMW specked slack to as tight as I could get it without the idle raising when bars were turned from lock to lock. WARNED Dave that if the weather got cold without readjustment of slack, idle might raise at full lock, made sure Dave knew how to test for this and readjust throttle cable slack.

    This helped quite a bit. I'm going to say this made 50% of improvement I precieved.

    2: loaded latest normal octane BMS-K firmware. If your firmware is older (smaller number) then 7729155, then your firmware was previous to the ignition retarding snatchy mod.

    Test rode. The latest normal firmware made the other 50% improvement in snatchyness I precieved.

    3: loaded the latest low octane map 7729157.

    I didn't percieve any snatchyness improvement from this mod over the latest normal octane map. For that matter, I barely precieved any hp difference at all. The only affect it seemed to have was a very slight reduction of hp above 7,000 rpm at full throttle and a slight reduction of responciveness when you quickly go from low or no throttle to full throttle at lower rpms.

    This squares with BMW's stated figure that the low octane map reduces peak output by 4 hp.

    In any case, Dave is happy with what I did. He was going to trade his 800 for a 650, and now he is going to keep the 8.

    Then again, Dave owns a dealership and trades bikes all the time so take this with a grain of salt. :)

    this is all inconclusive. I didn't ride his bike offroad, or on road enough, to form a firm opinnion of what all the low octane mod does, but whatever it does is suttle.

    Loading firmware 7729155, if your firmware was older then this makes a BIG difference, and reducing throttle cable slack helps as well.


    If you decide to update your firmware to the latest, or to the latest low octane map, it takes about 30 minutes as long as the GT1 does not crash.

    If you decide to go fourth with the low octane map, do your dealer a favor and tell them where it is if they have never done it. It took me a long time to find the bloody low octane mod.

    The keystrokes on the GT1 are: (Toolbox), (CIP), (F series), (F800,650), (Check sw), (Retrofit), (Fuel type).

    Then the usuall 15 yes and ok buttons and key on and offs required to do anything on the GT1 lol.

    P.S. I run 89 ron all the time and have never had detonation issues, for that matter, I've never heard detonation when i've been forced to run 87 ron. All with the normal map.
    #47
  8. Maddaddy

    Maddaddy Greg

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    Rockin' :thumb

    I will bring this with me.

    Good to know about the the throttle on throttle off. That's another this was hoping to solve. At least I know not to be surprised or disappointed.

    I'm going into this with an open mind.

    #48
  9. JRWooden

    JRWooden Long timer

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    Joel:

    Thanks once again buddy!

    At the 12K service I will ask for the new 1/2 second "retard" firmware ... :evil

    Are the firmware numbers the same for the F800GS and F650GS-twin?
    i.e. I want 7729155 for my F650GS twin?

    Thanks,
    Jim
    #49
  10. Motoriley

    Motoriley Even my posing is virtual

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    Now that I'm 45 I find it takes me a little longer to remember stuff. Maybe my firmware has now reached the 1/2 second retard stage. :D

    #50
  11. Maddaddy

    Maddaddy Greg

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    Smart move, because everyone knows you never go full "retard"...:lol3
    #51
  12. JoelWisman

    JoelWisman Long timer

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    No, The BMS-K and firmware are different on the 650. I have no idea what changed or when with the 650's. Sorry :(
    #52
  13. JRWooden

    JRWooden Long timer

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    Thanks Joel!

    If I'd have been in charge of the firmware

    1) It probably would be "FULL" retard

    and

    2) I'd probably have made it a separate version as well due to the differences in cam timing & etc and all the maps I want to change to get those extra 14 HP :wink:

    Jim
    #53
  14. oclv454

    oclv454 Been here awhile

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    Another owner had put a post on the other F650/F800 GS site and said that he had purchased a "Booster Plug" and that solved his problem. He didn't elaborate as to what it did, or if it affected fuel consumption, or how hard it was to install, or specifically how it improved the throttle on/off etc. Has anyone tried the Booster Plug? If so, what kind of improvment did you see? Thanks. oclv
    #54
  15. JRWooden

    JRWooden Long timer

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  16. Maddaddy

    Maddaddy Greg

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    So after reading and researching I ordered a Booster Plug as well. I received a prompt personal email from the maker stating it will be in the mail on Monday.

    If the re-map helps with the snap with a closed throttle, then this should help with the on off throttle at speed.

    I may get this beast tamed to be a real overland bike after all.
    #56
  17. cdo1uk

    cdo1uk Been here awhile

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    i have found a way of making the 800GS feel silky smooth..... all you have to do is go to your local Yamaha dealer and buy an XT660X/R and ride that for a while, get back on your F800 and there you go. silky smooth.... hmmmmmm:D
    #57
  18. Adventure boy

    Adventure boy Been here awhile

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    I was going to say that, if anyone feels the BMW is snatchy Ride An XT660, the throttle really is an on and off switch:rofl
    #58
  19. Singletrack_mind

    Singletrack_mind Cave Man

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    #59
  20. Maddaddy

    Maddaddy Greg

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    So I had my re-map done. I CAN feel a difference. Also confirmed by another with an objective view. From null to about 1600 rpm the jumpiness is gone. I also feel that as I ran up through the gears the transition was much smoother.

    The off / on throttle jerkiness at speed is still there. Which should be solved with the booster plug.

    The dealer want me to check in about a month to compare fuel economy.

    My riding routine is pretty consistent (commuting, speed, ect ect) So I'll report back soon.
    #60