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Thread: 5th Coil Shock

  1. #1

    Default 5th Coil Shock

    When moving the shock from one hole to the next on the lift bar, are you suppose to move the shock with it on the frame.

  2. #2
    Join Date
    Oct 2017
    Posts
    941

    Default

    I don't quite understand your question but when you move it on the 5th arm you move it a equal increment on the chassis in the same direction

  3. #3

    Default

    Thanks for the answer.

  4. #4
    Join Date
    Oct 2017
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    941

    Default

    Np also worth noting is generally when moving back it is recommended to increase spring rate

  5. #5
    Join Date
    Jun 2016
    Posts
    23

    Default

    I was told to add 25 pounds more spring each hole you moved it back. That was a long time ago, is that theory still true?

  6. #6
    Join Date
    Oct 2017
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    941

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    Quote Originally Posted by Roudy73 View Post
    I was told to add 25 pounds more spring each hole you moved it back. That was a long time ago, is that theory still true?
    It depends on the spacing

  7. #7
    Join Date
    Jun 2016
    Posts
    23

    Default

    So if it was a 300 pound spring an you moved it back 2inch would you put in a 325?

  8. #8
    Join Date
    May 2007
    Location
    Kansas
    Posts
    1,502

    Default

    Quote Originally Posted by Roudy73 View Post
    So if it was a 300 pound spring an you moved it back 2inch would you put in a 325?
    If I did my math right, assuming 600 ft pounds at rear end with a 5.00 gear for 3000 ft pounds at the axle then the poundage at the arm is this at this length (I used numbers to make it easy)

    32" = 1125.28#
    34" = 1058.84#
    36" = 1000.00#
    38" = 947.39#

    Obviously this is assuming enough traction to be full throttle or least to the torque rating I listed at that RPM and time. Increase/decrease the torque, gear, or traction and those numbers can go up or down a fair amount.
    Last edited by billetbirdcage; 06-17-2020 at 04:08 PM.

  9. #9
    Join Date
    Jun 2016
    Posts
    23

    Default

    Are guys still starting around the 300 range with a crate car?

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