BMW F800GS engine tuning

Discussion in 'Parallel Universe' started by DakarBlues, Dec 17, 2009.

  1. DakarBlues

    DakarBlues One-everythinged man

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    Did someone come up with serious engine tuning for this great bike?
    Even something like a new map to smooth out the engine?

    BMW 800 GS has the potential of being THE bike.
    I road tested it (quite briefly I admit) and the vibration at highway speed is a nuisance.
    I am sure it's possible to hoist that engine to the performance level of a KTM 990 without affecting gas consumption.

    With its frugality, it's on its way to be the far away adventure bike of choice.
    #1
  2. MookieBlaylock

    MookieBlaylock Long timer

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    if you open up the intake and exhaust you will need more fuel also, so you will take a mpg hit. I am really surprised there are no tuning options for this motor.
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  3. RAD800

    RAD800 Been here awhile

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    :scratch Yes its possible but it would be alot of work, it would cost, you'd also lose fuel consumption and reliability. 15-20hp might not sound like much but when your trying to mass produce it and make it bolt on so people dont complain about the price its a big ask and id say thats why none's done it.

    eg. CBR1000RR 180hp kit cost about 1200 us and that again in labour to fit it all.
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  4. tmex

    tmex Long timer

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    Of all the things I might be tempted to toss money at with respect to this bike the engine is not one of those things. It is near perfection IMO. The mapping on mine seems to be perfect. I have never felt like I needed more power or smoother throttle response in the adventure mode. Sure, my Duc 998 would leave it for dead on the tarmac, but so what?

    Just a non-issue as far as I am concerned.
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  5. josh9399

    josh9399 Daily Adventurer

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    I agree with tmex, I just wish it wouldn't redline at just over 110 MPH.

    Can you turbocharge it? Is it even possible? I've seen a turbo on a CBR600 so it should be possible.
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  6. Jakobzen

    Jakobzen ├╝ber nOOb

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    Well, you can add turbo to a F800s, so it should be possible to add it here too, since it's almost the same engine
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  7. Ceri JC

    Ceri JC UK GSer

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    In terms of engine work, I'd be more interested in something like a Power Commander V with the "Autotune" module so that it had better ability to adapt to things like dramatic changes in altitude, ambient temperature, fuel quality etc., on the fly, rather than needing an engine remap. To me, that's a feature that seems more relevant on an adventure bike than outright power hikes.

    Likewisem, rather than trying to compete with sportsbikes for high end BHP, I'd be more interested in increased torque for lugging lots of gear and a pillion. To be fair to the GS though, it already copes very well with this in terms of how little difference it makes to the ability to accelerate etc. considering the fairly modest power output.
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  8. upweekis

    upweekis Long timer

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    In a 55 mph zone?
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  9. Zacharia_11

    Zacharia_11 11th Assassin

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    I wish TTS maked a tuner for the bike :tb ?
    I love the one I have.
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  10. mapuda

    mapuda Crash Tested

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  11. Y E T I

    Y E T I Unpossible

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    I'm with tmex on this one, I don't really see a need for more out of the engine. I would like to be able to fiddle with the FI settings to maybe try to further get rid of some of the initial throttle abruptness. Mine's a lot better with the 15T and G2 but with an FI tuner it could be even better.
    #11
  12. Zacharia_11

    Zacharia_11 11th Assassin

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    Ya, that tuner is more of a cool gadget for me. I currently dont' have plans for engine mods or A/C, exhaust mods. Access to the ECU is what I would really be after here. The TTS allowed you to calibrate your speedo (like if you changed wheels) and turn the engine heat management system on or off along with adjusting many other tables that control the rpm, AFR ect... Data logging was also pretty cool, but from what I understand the 911 tool has some of that data logging capability. Learned a lot of real cool stuff about my bike that way.
    #12
  13. LukasM

    LukasM Long timer

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    So, has anybody installed a Power Commander V on their GS yet?

    I found this diagram from a German tuner of an F800GS that had been fitted with an Akrapovic and tuned on the dyno. More power everywhere instead of just peak HP sounds good to me! :thumb

    [​IMG]
    #13
  14. Y E T I

    Y E T I Unpossible

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    I wonder what that did to the guy's mileage? I just want to smooth things out a bit, especially the initial bit right off idle.
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  15. The Griz

    The Griz Long timer

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    Sorry, man, this simply is not the case. I've rejetted two KLR650's that I was running UNI air filters and Two Brothers exhaust on. If you open up air intake and open up exhaust flow without increasing fuel intake then you'll be running extremely lean: loss of power, overheating, pop-pop-pop, etc.... Now, if you open up air intake, open up exhaust flow, and also increase fuel intake to match, then what you've effectively done is improved power AND fuel economy. The engine will only burn what you provide it or allow it to have. It's not like we're forcing or pushing more air into the cylinder, rather allowing more air to come in. If you're allowing too much air to come in and not enough fuel: LEAN. If you're allowing too much fuel to come in and not enough air: RICH. If you're providing the correct mixture of air and fuel to the cylinder: IT WILL RUN PERFECT - regardless of exhausts and air filter. As long as the mixture is at the stoichiometric ratio of 14.7:1. The engine will only burn what you allow it or provide it. On both of my KLR650's, after I properly tuned the fuel air mixture to match what the cylinder needed, I noticed improved power and throttle response while maintaining the highest fuel economy, if not improving that as well.

    Now, regarding the F800GS. I am running a UNI USA air filter and Leo Vince carbon exhaust. I am only assuming that the engine management computer increased the amount of fuel being injected into the mixture in order to compensate, but who knows?:dunno There is no hard evidence that the computer on this bike will do this. I do know that I'm pop-pop-popping down the road, which indicates a lean condition. This is due to the increased heat build-up in the exhaust system that the lean condition creates. This increased heat in the exhaust manifold causes some of the gases in there to ignite: POP POP!

    http://en.wikipedia.org/wiki/Air-fuel_ratio
    #15
  16. JoelWisman

    JoelWisman Long timer

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    I agree with your post above Griz, but will add a few things.

    Yes the F800GS will compensate for a more free intake and exhaust to a point. It does have an oxygen sensor and a learning fuel map.

    Base idle and closed throttle decel are NOT compensated by the F800GS but rather on a fixed fuel map.

    All of them pop some on decel and this is much louder with aftermarket exhausts at least partially because the exhaust noises are usually much less muffled.


    If power is all that one cares about then lambda (14.7 : 1 by mass) is not what you are looking for, you are looking for a somewhat fuel rich mixture.

    This will be helpful to exhaust valves, tend to foul spark plugs, suck from a hydrocarbon and carbon monoxide emissions standpoint, destroy the cat, and reduce fuel economy, but will increase HP slightly
    #16
  17. The Griz

    The Griz Long timer

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    Good to know Joel! Thank you!:thumb


    Exactly!! Me? I'm looking for 14.7:1.
    #17
  18. Gangplank

    Gangplank Advenchaintourer

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  19. Bucko

    Bucko In a parallel world

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    What this bikes needs for higher speed, comfy freeway cruising is a taller six gear, not more BHP. It does just fine in that department. Anyone that doesn't think so should ride a KLR for a couple years :D

    The only thing I'd improve is the jerkiness just off idle, but the bike has enough torque to use second gear in many slow situations, so even that doesn't bother me too much.
    #19
  20. Gangplank

    Gangplank Advenchaintourer

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    Ever try a PC? On my track bike it's the schitz!
    #20