F800GS german tuning

Discussion in 'Parallel Universe' started by DakarBlues, Sep 19, 2009.

  1. DakarBlues

    DakarBlues One-everythinged man

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    Folks,

    I yet to hear about the 800GS engine being tuned in.
    Come on, this machine comes from Germany, the land of Alpina, Schnitzer, AMG and other potent tuners.
    Why is it that nobody has extracted yet a quintessential 10 or 15 supplemental hp and flattened even more so the torque curve of this great stead?

    Is there any tuner down there proposing, high performance maps, big bore cylinder of other performance bits?
    #1
  2. RAD800

    RAD800 Been here awhile

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    Wasn't there an italian company doing this stuff? in sure there was, they had a bike that looked pretty cut up and striiped down to look more enduro than tournig. They didn't have anything full on engine wise but they had 18' wheels, cooling stuff ect.
    My biggest want is something to fill the gap between the headlight and a high guard and look half decent, but ill keep dreaming.:cry
    #2
  3. Cacciatore3

    Cacciatore3 xxx

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    I´m looking for the same thing...more power for the F800gs...SOS!!!
    #3
  4. LukasM

    LukasM Long timer

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    You can get 93 HP from the F650GS + F800GS with different cams and mapping, and 105 HP with different cams, mapping, airbox mods, and a full exhaust system.

    [​IMG]


    Get in touch with Andreas Reh in Germany, http://www.rehcing.com/
    #4
  5. norseXL

    norseXL Been here awhile

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    Yepp, it´s called Husqvarna :D
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  6. OnkelPopanz

    OnkelPopanz Adventurer

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    Who really needs it? ;-)



    **************************

    Tapatalk
    #6
  7. Cacciatore3

    Cacciatore3 xxx

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    Thankyou Lukas.
    I had followed the link that you placed but there is no way to contact them, please can you give me an email or phone number??
    93HP will be great.
    #7
  8. LukasM

    LukasM Long timer

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    Phone number and email are here:
    http://rehcing.com/impressum

    +49 2772 646690
    info(at)rehcing.com (replace with @ sign)

    German country code is +49 but you might have to dial a 1 before from South America, not sure?


    Let us know what you find out. :wink:
    #8
  9. ebrabaek

    ebrabaek Long timer

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    I would love to buy a set of 900 ( nuda ) pistons........ then bore the cylinders.......re nikasil them..... and go from there with a pc-5....and auto tune...... Yum..... I mean wruuummm....
    #9
  10. Ducksbane

    Ducksbane Quaaack!!!

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    I'm idly toying with the idea of finding a nuda engine and building my own F900GS ... since BMW don't want to do it. Not sure about the legalities though. :deal
    #10
  11. ebrabaek

    ebrabaek Long timer

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    The first step on my DRZ was a bigger carb, and BB....reaised it from 400 to 440.... The results were amazing... From 32.5 to 40 rwhp on the dyno..... Torque was fantastic.... Then later came the stroker crank.... cam's...even bigger carb... pipe , head porting.... and it now yields 55 rwhp...... simply a hoot..., So I can just imagine what the from 800 to 900 would do.... If there is room for the extra few mm's of bore.... I know a place that properly could do it in Denver, with the plating included..... no piston clearance issue... That I could think of.... Yum.....
    #11
  12. ebrabaek

    ebrabaek Long timer

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    The first step would be to measure the cylinder wall....to make sure there would be enough room for the bore...... Anyone knows??????
    #12
  13. wipe-out

    wipe-out Been here awhile

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    interesting... :hmmmmm already in touch, maybe sth for the winter...
    #13
  14. itsatdm

    itsatdm Long timer

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    I doubt if the Nuda pistons will work. The Nuda gets its displacement with a 2mm bore job and 4.5mm stroked crankshaft.

    A 2mm bore job alone is not going to be close to 900cc. The bore is nikasil, so add $250x2 to have that done. A stroker crank may mean the piston pin placement might be different than the 800 piston.

    A rebore and a stroked crank, along with a different firing order. (360 degrees vs 315 x 415 degrees) is going to require a different ignition profile and FI timing. I can only guess what those parts are going to run.

    To expensive for me, so I will wait and see if BMW just uses the engine at some point.

    I think they will. Triumph can claim more HP, though it makes no difference until you get past 100 mph. KTM is supposedly introducing a 1090cc adventure bike for 2013. HP still sells, though I would prefer a weight loss program.
    #14
  15. ebrabaek

    ebrabaek Long timer

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    I agree on the stroker crank part..... I don't want to go there..... But a 2 mm bore.....I would take in a heart beat..... That would be huge ..... about 850cc which would be significant.....
    #15
  16. itsatdm

    itsatdm Long timer

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    One other fly in the ointment with the Nuda pistons. They provide a 13.1 compression ratio in the Nuda. The 800 seems to have problems running 12.1 CR with out engine meltdown with poor gas. The Nuda also has bigger valves and more radical cams. Having more valve overlap mitagates the effect of higher compression ratio's as it shortens the time the engine is really at that ratio. So assuming the Nuda piston will fit, you may introduce other problems.

    Outside my knowledge base, but how are you going feed your big bore? The amount of fuel is determined by how long the injector remains open. That won't change. It seems you run the risk of leaning out the mixture with more cc's to feed.

    I did a 2mm big bore on my 650 single. It netted me 28cc. A welcome boost in torque across the rpm range. Top speed actually went down a few mph. 2mm on the 800 will get you 48 cc.


    A bore job on my single was $85 for one cylinder a few years ago. I have seen the cost to replate a single nikasil cylinder at $250. Double that for the 800 and then throw in the cost of new gaskets along with what ever the cost of new pistons and I just do not think it is worth the mod.
    #16
  17. ebrabaek

    ebrabaek Long timer

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    I guessed about 50cc gain.....Sounds like you did the math.... The reason the nuda have higher compression... is the stroker crank... Or should I say...most likely. The BB will not alter the compression as the stroke is not changed. As far as the fuel delivery... You would need the PC-5 or equivalent.....with in my case....the autotune module. Only reason you lost top end is your fuel delivery is not correct. Nothing going back wards with a BB. Many people forgets that when you BB a bike..... your main jet will meed to be decreased.....Or in case of fi......Not programed correct.
    The BB way is the easiest way to increase the out put with the least amount of intrusion on the motor.... Thais is of course..... factoring in the facet that there is enough room for the bore increase.....in the cylinder skirt....... and that.... I have no clue....:D
    #17
  18. itsatdm

    itsatdm Long timer

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    Sounds simple, just buy and bolt it on.:rofl
    #18
  19. ebrabaek

    ebrabaek Long timer

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    :D:rofl........ Ehhhh...uhmmmmm.... Trouble here is that there are no r/d available...... Son the first step would be to check the clearances in the cylinder case.....to make sure there are room for the bore... Then contact some one like cylinder works in Denver,CO......and see if they could do it....and what they charge for it plus the nikasil plating......then get the parts...... ( very expensive ....I think)..... PC-5+autotune...... It is somethink I would like to do.... If there was room......:freaky...
    #19
  20. itsatdm

    itsatdm Long timer

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    I think those engines may be more different than what we think. I saw a schematic of it and it looks like they went back to a counter rotating balance shaft.

    You never know what you will find. A KLX 650 and KLR 650 have the same bore and stroke. You would think the KLR 685cc piston would bolt right on.

    Only if you run diesal. 16 to 1 CR in a KLX. Different deck height.
    #20