emulators for GS?

Discussion in 'Old's Cool' started by 2whelman, Dec 15, 2009.

  1. 2whelman

    2whelman addict

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    I called Race Tech, they were confused about whether they offered cartridge emulators & springs for a 95 GS. None are listed on their part sheet.
    Surprising, considering how long they have been around.


    Seems like it was a harley part # or something other than for a BMW.


    I know I saw a posting on doing this a while back, can some one send me the information, if its out there?
    #1
  2. Infracaninophile

    Infracaninophile Finding My Way..

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    Yes, they make a part. You only need one of them, in one fork leg. A lot of people try to find someone else to buy the set (they come in a set of 2) and split them as the parts are identical.

    If you look in my R100GS thread (in my sig) you can find the pics and write up where I did it. I use waaaaay too much detail for most folks. Look for post #539 as it starts there.

    [​IMG]

    [​IMG]

    Tom
    #2
  3. ChromeSux

    ChromeSux Plated and screwed

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    #3
  4. batoutoflahonda

    batoutoflahonda Long timer

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  5. KhaoSanMan

    KhaoSanMan Airhead

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    Part Number for springs on my receipt from PO:

    RT-FRSPSPS323495 Race Tech FRK SPNG 31.7/340 $94.50

    Purchased at Gateway BMW in Mountainview, CA in 1998. (650) 966-1183
    #5
  6. jimbee

    jimbee Airhead Intermediate

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    I'll split a set with you if you want.

    And thanks to all who have posted how to write ups. For some reason, fork inners intimidate me.
    #6
  7. Infracaninophile

    Infracaninophile Finding My Way..

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    But you're okay with the "outers?" :lol3

    Tom
    #7
  8. jimbee

    jimbee Airhead Intermediate

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    Hmmmm. My inner pervert thinks you may be making fun of me. Nurture, Nature, whatever, I like the female ends! :evil
    #8
  9. Infracaninophile

    Infracaninophile Finding My Way..

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    Your "inner pervert" alarm has made a false alarm. I was just making a comment on how it's the Insides of forks that mystify you, but not the outside. I was exactly the same until I did mine. Now it seems so simple. Go ahead and tackle it.

    T.
    #9
  10. Dustdevill

    Dustdevill Adventurer

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    You should rather fit both emulators. This will mean that you have to buy a damping rod for the left fork the same as the one fitted to the right side.
    This will have compression damping in both left and right forks and rebound damping only on the right side.
    #10
  11. 2whelman

    2whelman addict

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    Ok, I'll order the set next week, I am swamped with projects at work right now.
    Unless you order a set, in that case, pm me with what I owe you.
    #11
  12. zenben

    zenben all roads are one

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    #12
  13. Weaverman

    Weaverman Damaged goods

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    I am also intersted in splitting a set of emulators with someone...'94 R100GS.
    #13
  14. jimbee

    jimbee Airhead Intermediate

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    Sounds good! I'm happy to order but I'm fighting some year-end deadlines and I don't want to be the bottleneck. Prob best you order when ready and I'll send you some $$$ Cheers! JB
    #14
  15. AntonLargiader

    AntonLargiader Long timer

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    That would be my approach, too.

    I think there's still (and always will be) some misunderstanding of these forks. Which are IMO the best forks ever used on Airheads.

    Whereas there's always damping whenever something moves through oil, inspecting the internals leaves me with a crystal clear concept of how the majority of the damping takes place. Take a look at my web page and you might see things differently.

    In the left there is travel-dependent damping (WAD in BMW-speak) affecting compression and rebound. The spring support is nothing more than a guide for the end of the damper rod; it is cutaway so as not to impede the compensation flow.

    In the right there is a rebound piston with a check valve to negate resistance upon compression. However, because the spring support has to seal (to provide the rebound damping) there is typical damper-rod compensation flow. Displaced oil goes into the bottom of the damper rod through the existing holes and out the top, in the middle of the spring seat. This flow is what the Gold Valve sees.

    So you probably have some small degree of damper-rod compression damping in the right leg, but I doubt that drilling more holes in the damper rod changes it. The internal diameter and length of the damper rod is probably the flow-limiting factor. In the grand scheme, you are retaining all of the existing compression damping because the left leg is unaltered and the right leg is probably unaffected by the extra holes.

    It's very possible that the GV provides better damping than the stock setup. The WAD works on the full volume of oil in the fork tube, whereas the GV only sees the compensation flow. That's probably less harsh. So if I were to do this, I'd probably alter both fork legs and rebuild the damping completely.

    But before I did that, I would probably install real cartridges.
    #15
  16. zenben

    zenben all roads are one

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    Agreed. If one can bear the cost, this would be the ideal solution.
    #16
  17. 2whelman

    2whelman addict

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    So, correct me if I misunderstand, are you saying the gold valve is not going to alter the front end dive? I am not looking to make this into a world class, Dakar racing, ditch eating front end, I just want less front end dive on braking, everything else about the fork is perfectly fine for my use.

    I have installed the emulators in other bikes, they helped, some of the bikes they helped A LOT. I dont want to bother if it isnt going to help.
    #17
  18. AntonLargiader

    AntonLargiader Long timer

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    I didn't say that.
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  19. espressodrinker

    espressodrinker Cape Town Wanderer

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    It's very possible that the GV provides better damping than the stock setup. The WAD works on the full volume of oil in the fork tube, whereas the GV only sees the compensation flow. That's probably less harsh. So if I were to do this, I'd probably alter both fork legs and rebuild the damping completely.

    But before I did that, I would probably install real cartridges.[/quote]

    What are real cartridges?
    #19
  20. supershaft

    supershaft because I can

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    It's been awhile but don't emulators have adjustable rebound AND compression damping? If that is the case, I am with Anton. Why put one in just one leg? They are a pain to adjust but why install them if you are not going to set them up?

    I know I have been preaching the same sermon lately but this is yet another case where someone is going about fixing an issue ass backwards. The issue is excessive dive. You don't fix that with damping! You fix it with spring and preload! Think about this: What little you can reasonably fix excessive brake dive with damping should be fixed by learning to get into the brakes a bit more progressively in that first instant of braking. More compression damping is just slowing down the inevitable compression of the SPRING. Your fingers can do that via brake control. I am not saying that there is no need for compression damping. There is. My point is to ask not what your compression damping can do for you but what you can do for your compression damping. Let it do it's job and don't expect damping to do the job of the spring. Damping is there to help the spring, not BE the spring.

    My advise is to avoid setting up your front end for braking. Watch your favorite world class riders and watch just how much their front ends dive under braking. Their front ends dive a lot and often. To over simplify the situation to help my point, they setup up their suspension to best deal with grip in the turns and compliance everywhere else. If they set up their bikes to better deal with brake dive, they would be WAY too stiff everywhere else. What do they do to stop excessive brake dive while their suspension is 90% setup for everything BUT braking and too soft during braking because of that fact? They learn how to get into the brakes in a manner that slows and minimizes dive! They get into the rear brake a bit first to squat the rear so the entire bike starts the process lower and minimizes dive but most importantly they EASE into initial braking. The EFFECT is the same as more compression damping without the downside of having too much compression damping for the rest of your ride.
    #20