F800GS computed range on full tank wrong?

Discussion in 'Parallel Universe' started by Migs, Sep 30, 2010.

  1. Migs

    Migs Been here awhile

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    What's with the F800GS computer as regards range based on gas tank level? My tank is full but the range reads 174 which I presume is kilometers, which is quite a bit less than I expect. Is this normal or am I doing something wrong?

    Thanks for enlightening me,

    Migs
    #1
  2. tex99999

    tex99999 Sailor

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    Better read the manual - it explains everything...

    Jon
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  3. Migs

    Migs Been here awhile

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    Pg 25-26 of the manual says:
    Kilometres travelled after fuel down to reserve with on-board computer OE Once the fuel has dropped to the reserve level, the reading shows the kilometres travelled since then. This counter is reset as soon as refuelling brings the total quantity of fuel on board back above the reserve level.

    OK: "Kilometres travelled after fuel down to reserve" - why would I care about the distance traveled? I want to know how far I can still go. Even better what distance I can travel with a full tank. This makes no sense yet!
    #3
  4. RedHawk47

    RedHawk47 Adventurer

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    The system cannot tell exactly
    how much fuel is on board when
    the tank is completely full. Under
    these circumstances the display
    shows a minimum-range figure
    accompanied by a ​
    > symbol. A
    more accurate figure for range is
    shown as soon as the fuel level

    can be measured exactly.
    #4
  5. CheckerdD

    CheckerdD Long timer

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    The fuel gauge remaining mileage/kilometer function does not work to well. Most read not at all correctly, to low, till about 80-100 miles to go. I think that is about 130 to 160 klicks. Keep a log of what the gauge says when you fill up, and how much you put in, and you will get to know its limitations.
    I was tempted to get really sarcastic with you because this has been discussed before. Dave
    #5
  6. Migs

    Migs Been here awhile

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    Thanks to all of you for the patience with my question. As some might not realize there are two things that might tire the older users on the forum, that a new user has no control over:
    -search is really poor on these forums, and most of us are not good searchers. Indeed, search is an art now a days. Even using Google site search with many terms quickly overwhelms Google.
    -new users have no way of knowing that some topic was discussed.
    So thanks again for the help.
    -Migs
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  7. Migs

    Migs Been here awhile

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    Redhawk: My 2009 manual doesnt have that. It is a spanish version...

    I get the idea though. Make my own calculations and go from there. I got hopeful: I have a Toyota Land Cruiser that adds the "kilometers" in the main and sub fuel tanks and continuously displays the range left.
    -Migs
    #7
  8. johnparjr

    johnparjr Been here awhile

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    mine is fairly accurate but I don't go by it anyways
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  9. Effisland

    Effisland Been here awhile

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    Just keep in mind that changing your driving style will affect the estimate of kms left, based on the increase/decrease fuel consumption. I've noticed the kms left drop dramatically if I begin riding harder.

    Also, I agree - the search sucks! Was looking for the thread about changing the rear tire that was here a couple months ago. Think I could find it? Welcome to the forum!
    #9
  10. EnderTheX

    EnderTheX Dirt Rider

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    I couldn't agree more about both points.. ADVrider search sucks lol, use google to search this site, much easier.


    Also on the fuel gauge use your head! If it reads 20 miles or less to empty find a gas station that is less than a half gallon!

    Show me a vehicle with a more accurate fuel gauge, I dare you! Most of our cars have a little analogue gauge that can be +/- 20 miles easy.

    Besides... running your tank very low or empty is hard on the fuel pump because the fuel is used to cool the pump.

    :freaky
    #10
  11. MaxReving

    MaxReving Been here awhile

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    BMW Motorrad has realized that the estimation of "range" has been too inaccurate due to the use of the "tape/strip" measuring system. They have therefore on the new 2011 models eliminated the "range" in the software. When you flick through the different modes with the info button (when you have a gas level above the 4 liter reserve) then it does not show range anymore. It now works as described in the quote above.
    #11
  12. mxbulldog

    mxbulldog Braaaap!

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    Went on a ride yesterday. Bike was telling me I had 40km left in the tank. Showing 2 bars on the fuel gauge. When I rolled into the gas station I topped it up to the very top and it only took a little over 13 liters. My gauge appears to be extremely pessimistic. This is after 8000km on the bike and I was riding with a good tailwind but the average mileage was right around normal.
    #12
  13. Singletrack_mind

    Singletrack_mind Cave Man

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    Well damn. Does anyone know if this change is a physical hardware change or just a software change, and if it's software, is it something they are going to try and install on older bikes as they are serviced at dealers for this issue or others?I like my range estimating feature and wouldn't want it "updated" to the system described. I've found it to be very accurate and useful. I've only had one big moment of doubt where I chose to fill up because I thought I should and discovered that the estimate was indeed way off, but that can be attributed to burning much of the tank on slow dirt riding and then switching to 80mph highway. Even that sort of thing usually doesn't result in unrealistic estimates on my bike though, I like the original system. Taken with a grain of salt & remembering it's an "estimate", not a guaranty, I find it useful.
    #13
  14. IQm3

    IQm3 Adventurer

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    A full tank in the F800GS should give you 320km (200mi) range.

    The actual reading on the fuel autonomy should be: > 200

    This means that you have more than 200km of fuel autonomy.

    That is why the fuel gauge is all the way up.

    Depending on your driving style you should exepect that the reading give you a fairly accurate estimate of how much fuel is left in the tank.

    If you're not at all satisfied with this reading, you can always reset the trip odometer every time you fill up the tank.

    :D
    #14
  15. MaxReving

    MaxReving Been here awhile

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    I have just been at Intermot 2010 in Cologne Germany where I asked the specialists at the BMW Motorrad stand that very same question and they said that when you update the software on an older (pre 2011 model) then the "range" function will be eliminated. This is not good news for all that have an older model. For a lot of riders the range" function is one of the most important and mostly used features.

    I will try to verify this at my local BMW service partner and get back asap with more info.
    #15
  16. Pete O Static

    Pete O Static Adventure Seeker

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    Exactly

    The BMW OBC has always had issues and provided dubious range information on various bikes, not just the F800GS. I ordered mine without the OBC specifically because of that.

    Using the trip meter and noting how much fuel you put back into your tank for any given distance is the easiest most accurate way to know how far you can ride. It doesn't take very many fill ups to figure out the consistent trend.

    I have the 650GS front sprocket on my bike and I know that my reserve light will come on at 280Kms +/- 10 kms. At that point, I also know that I have another 90Kms till empty. The greatest variable on the road is headwind vs tailwind but either way, no matter which sprocket I have installed that day, whether I am off road or on the interstate, when the light comes on, I note my distance travelled and divide that figure by 3 to get my distance till empty at the current average rate of consumption.

    Waaay better than relying on an OBC in my opinion. I am amazed at how many owners have no idea what there bike is capable of regarding range or endurance because they rely completely on the OBC.
    #16
  17. Maddaddy

    Maddaddy Greg

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    When man relies on technology to accomplish life's simple tasks, it will fail you at the most opportune moment, leaving you stranded and feeling stupid.

    Be smarter than your equipment
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  18. itsatdm

    itsatdm Long timer

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    Ask about the refund check I am going to get after paying for something and then have the features removed. :rofl
    #18
  19. Karbono

    Karbono Rookie GSer

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    That sounds a lot like the world of Sony and the playstation 3.

    Anyway, I realised today (first day out after I brought it home) that I don't have the range indication. That sucks!!!!!
    #19
  20. lmclamore

    lmclamore Citation Collector

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    In 1986 I got a ticket for wearing earphones on a motorcycle because the state believed it to be too distracting. As a safety instructor, we taught that riding a motorcycle uses 5 times as many mental processes as driving a car.

    Fast forward to 2010. We now have OBC's, GPS's, XM Radio, IPOD's, Bluetoothed cell phones and more to distract us from the tasks associated with riding our motorcycles. I welcome a little less "information" in my face. I would be satisfied with an analog odometer and the ability to pull off the gas cap and see the bottom of the tank.

    I want less to monitor, charge, plug-in, program, re-set, and service in my motorcycling experience. A little more RL sight, sound, and smell please.
    #20