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MMA 2.5 lift on the way

This is a discussion on MMA 2.5 lift on the way within the Ranger Discussions forums, part of the Polaris Ranger Forums category; Originally Posted by teshreve it defies what i know about suspension tuning. uh-oh !!!!!!!!!...

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Thread: MMA 2.5 lift on the way

  1. #21
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    (Greg) Super Moderator Toxic-21's Avatar
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    Quote Originally Posted by teshreve View Post
    it defies what i know about suspension tuning.
    uh-oh !!!!!!!!!
    Last edited by Toxic-21; 01-06-2017 at 02:33 PM.
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  2. #22
    Elite Member TacomaJD's Avatar
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    Quote Originally Posted by teshreve View Post
    Raising the center of gravity to reduce body roll? Nice! .
    When the proportionality of stiffer suspension outweighs the effects of higher center of gravity, then yes, you have a more stable machine although riding higher as well. At the very most in a perfect world, you only get 1-2" increase in static ride height by clicking shocks all the way up. That's not substantial in worsening the center of gravity, regardless.
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  3. #23
    (Todd) 1000+ Member teshreve's Avatar
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    Quote Originally Posted by Toxic-21 View Post
    uh-oh !!!!!!!!!
    Why uh-oh?

    I believe the primary purpose of preload is to maintain ride height and handling characteristics as you add weight. I can partially understand a condition where preload is increased without increasing weight that results in less body roll at the cost of ride comfort. Or perhaps the opposite, such as adding weight without adding preload causing more body roll and increasing ride comfort. Increasing preload without increasing weight will for sure raise center of gravity, which for sure cannot help body roll, and perhaps this effect is more than counteracted by the spring thang. But again, I don't buy it until I try it. Regardless of all that, moving the upper shock mount to the outer position will make a huge improvement to body roll. That I have done and the effect is immediately obvious. However, it too comes at a cost, which is reduced ride comfort.
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  5. #24
    (Todd) 1000+ Member teshreve's Avatar
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    Quote Originally Posted by TacomaJD View Post
    At the very most in a perfect world, you only get 1-2" increase in static ride height by clicking shocks all the way up. That's not substantial in worsening the center of gravity, regardless.
    That is a good way to look at it. The preload change, as a percentage impacts ride height less than spring stuff (which is still yet to be adequately explained IMO).
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    Elite Member TacomaJD's Avatar
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    Just go click yer shocks up a few clicks and tear out over some rough stuff and report back. Lol.
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  7. #26
    Elite Member TacomaJD's Avatar
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    I wish I could find an exploded diagram of the internals of the shock, as well. I wonder if the piston's higher location inside the shock tube has any ill effects on damping when preload is increased making it ride higher.

    I know I have touched on this before here and am under the impression that oem standard ranger shocks are hydraulic. So are they 100% only filled with shock oil, under absolutely 0 gas charge? Mono tube design I'm assuming? You can get into a lot of suspension frequency variants between mono tube, twin tube, hydraulic, Nitrogen charged, bypasses, etc.

    Wish I had an old wore out shock I could cut down the center and inspect to fulfill my own curiosity.
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  8. #27
    (Todd) 1000+ Member teshreve's Avatar
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    Quote Originally Posted by TacomaJD View Post
    Just go click yer shocks up a few clicks and tear out over some rough stuff and report back. Lol.
    It's 10 degrees out (record low!) and I am a wuss. But I will!
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  9. #28
    Elite Member TacomaJD's Avatar
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    Thinking more on this. Actually with the shock piston riding higher in the shock tube, there would be less volume of the oil displaced by the shock shaft's mass, which would decrease pressure internally, but the shock shafts on those shocks is small anyways.

    So shock oil is incompressible....ok. how does it work when the shock is extended all the way out? Is there a void of air inside shock or what? There's gotta be some way of regulating pressures and such internally when the shock compresses and extends. This is why gas is used in shocks. You can't take a sealed shock full of incompressible oil, and introduce the mass of the shock shaft in with the volume of said shock oil without it bursting....same as if it was filled and sealed collapsed and then the shock was extended all the way with the shaft's mass removed from the volume of incompressible oil.

    1.) The gas charge keeps the nitrogen under pressure and helps to eliminate cavitation (air bubbles)

    2.) The gas charge allows the existence of a substance that is now compressible inside the shock to accomodate for when the shock is compressed and the volume of the shaft is now inside the shock body increasing internal pressure that is now being soaked up via compression of the nitrogen volume.

    If these shocks contain no gas charge at all, I'll have to really learn more about the physics of a hydraulic shock.

    Makes my head hurt. Lol
    Last edited by TacomaJD; 01-06-2017 at 04:18 PM.
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    SuperATV forward arched arms
    30" EFX Motoclaws / STI HD5 beadlocks
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  10. #29
    (Todd) 1000+ Member teshreve's Avatar
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    Greg says this isn't a shock thing so zip it! lol

    Got the friday 'tude going on, woohoo
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    (Steve-o) Elite Member Naylor649's Avatar
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    This is some in depth stuff we have going on. My shocks are still riding straight up and down on the outkast arms
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