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  1. #1
    Join Date
    Apr 2011
    Posts
    224

    Default RF shock bottoming

    02 Masterbilt wide combo. Finally going fast enough to see two things happen:

    RR tire rubbing frame...can't do anything about that yet...

    400 RF spring bottoming out. What would be the effects of this? What should I expect when I put a 450 on it?

  2. #2

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  3. #3
    Join Date
    Aug 2012
    Posts
    212

    Default

    are you sure that the shock is bottoming out or is the frame hitting the ground.

  4. #4
    Join Date
    Apr 2011
    Posts
    224

    Default

    The rubber gauge on the shock was reset at the beginning of the night at the top of the shaft. It's all the way down in the cup, so the shock is actually bottoming. The frame rail does not show any signs of rubbing

  5. #5
    Join Date
    May 2007
    Location
    Kansas
    Posts
    1,935

    Default

    Quote Originally Posted by dfhotlm33c View Post
    The rubber gauge on the shock was reset at the beginning of the night at the top of the shaft. It's all the way down in the cup, so the shock is actually bottoming. The frame rail does not show any signs of rubbing
    If the frame/nose isn't dragging and just bottoming out the RF shock:

    1. How much exposed shaft do you have at ride height? 3.5" or what?
    2. You can move lower mount on the control arm down or the upper up and get more exposed shaft to allow more travel out of the shock.
    3. If you are still using a 2 piece lower arm, going to a one piece lower will usually have the lowered bottom mount to get more exposed shaft

    Obviously you can just stiffen up the spring or use rubbers or something to increase the rate and stop bottoming out. Then doing the more exposed shaft can also allow more travel but at some point the frame/nose/crossmember may start hitting.

  6. #6
    Join Date
    May 2007
    Location
    Kansas
    Posts
    1,935

    Default

    To answer your "what would it do question"

    Stiffer RF will loosen off throttle entry and tighten on the gas, excluding any aero loss on the front end (loss of aero on front will tighten car)

  7. #7
    Join Date
    Apr 2011
    Posts
    224

    Default

    It’s awesome how much knowledge is here. Billet, yes, basically 3.75” shaft showing at ride height.

    When I’m bottoming the shock, what should that be causing with handling? Inconsistency? Sometimes the car was really good and would set and drive off pretty nicely. Sometimes it would just act erratic. Is this a result of me entering with enough speed sometimes to bottom the shock and then “weird” things happen?

  8. #8
    Join Date
    Oct 2017
    Posts
    1,363

    Default

    Depends at what point it was bottoming out as to what effect it will cause specifically but in a nutshell yes it will make the car erratic. Also worth noting is if you move your shock mount either up top or on the control arm your ride height will be effected and an adjustment will have to be made. Example: if you move the mount up a 1/2" your gonna have to ajust your coil over the same amount but down to keep things equal

  9. #9
    Join Date
    Jul 2014
    Posts
    399

    Default

    Take the spring off the rf shock, Jack up LR till travel limiter is tight. What you can and need to do on RF and LR should be apparent. Pull the RR down 2"-3" from Ride HT....ratchet strap. Binds and bottoming are bad Those MB WIDE COMBO cars had a lot of issues as I'm sure you know. Those cars responded well to LR clamped.

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