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Hot Rods whats the spring rate for so cal coil over street rods springs?

Discussion in 'The Hokey Ass Message Board' started by doug warren, Jan 21, 2018.

  1. doug warren
    Joined: Apr 3, 2017
    Posts: 37

    doug warren

    So I broke two stock model A rear ends after swapping out my stock engine for a 153 ci four banger and a t5 trans. runs great. I swapped out a narrowed 9inch and installed with a universal street rod kit. ladder bars,pan hard bar, coil overs,brackets, etc. Everything works ok but the rear springs are way too stiff. Ive got a bumpy asphalt road to my house and by the time I get there Im ready for a barf bag. Ive tried adjusting the compression and rebound and it seems to be a little softer but still way too harsh for me. Cant seem to get a straight answer from so cal as to what the spring rate for these shocks as shipped were. just wondering if anybody has experienced this or what spring rate do you think it should be. I believe they ardran brand. Im not sure of the spelling but.Im punning a two door sedan weighs like 2660 lbs. Any thoughts.
     
  2. mgtstumpy
    Joined: Jul 20, 2006
    Posts: 7,722

    mgtstumpy
    Member

  3. 1946caddy
    Joined: Dec 18, 2013
    Posts: 1,510

    1946caddy
    Member
    from washington

    I'm not sure what shocks you've got but when I talked to SoCal a few years ago, they said they used 250# shocks in the rear of their 32 Roadster.
     
  4. jaw22w
    Joined: Mar 2, 2013
    Posts: 929

    jaw22w
    Member
    from Indiana

    Shock placement and installed angles can make a huge difference, but if your current springs are 250#/" it is no wonder the rear is stiff. My 26 coupe weighs 2550#, 1250# on the rear. Shocks @18 degrees. I run 140#/" springs on my coilovers. One spring removed on the front. Rides real nice. I have 150 #/" springs in my 27 roadster. A little stiffer than the coupe but still rides good.
     
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  5. linechaser32
    Joined: Apr 8, 2006
    Posts: 937

    linechaser32
    Member
    from Iowa

    180 Lb. on my 5W , 30 degree angle, works well.
     
  6. jaw22w
    Joined: Mar 2, 2013
    Posts: 929

    jaw22w
    Member
    from Indiana

    Most race shops have a spring rater. Have your springs checked.
     
  7. Joe H
    Joined: Feb 10, 2008
    Posts: 794

    Joe H
    Member

    Springs are easy enough to check. Get you a digital scale and a couple steel plates to spread the load across the whole scale. Slide the scale under a heavy car or truck with said vehicle jacked up. Use a couple rulers to measure with. Zero out the scale with plates and spring setting on scale. Lower the vehicle down till the spring is compressed 1", read the scale. It should be in the 250 lb area if the spring rate is 250. All springs are rated the same way, X amount of weight, for every 1" of compression. If you was to go 2" down, the scale would read 500 lb for a 250 spring rate. Once you know the rate and the angle they are mounted, do the math from the charts above.

    You can also measure using a hydraulic press and a scale.

    Something else to consider, if you are using a heavy rear axle and tires, the actual weight the springs are carrying will be much less the what the scales under the tires is reading. If you could place the scales between the springs and axle housings, you could measure the actual weight of the body. The unsprung weight, such as brakes, axle, driveline, tires and wheels, is controlled by the shocks and some by the springs, but not totally by either one.

    USE CAUTION!
     
  8. porknbeaner
    Joined: Sep 12, 2003
    Posts: 41,391

    porknbeaner
    Member

    You can actually do the same thing with an arbore press and a scale. I have even seen guys do it with a common bathroom scale and hit pretty damned close.

    Any spring shop should be able to measure the spring rate for you and most towns of any size have several spring shops.

    I cannot imagine that SoCal does not know what spring rate their street rod kits have, it should actually be printed in the literature or invoice that came with the kit.
     
  9. Mr T body
    Joined: Nov 2, 2005
    Posts: 2,078

    Mr T body
    Alliance Vendor
    from SoCal

    my 31 with the rears over 26* with 225# springs. Could go 200 but not terrible right now.
     

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