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  1. #21
    Slow'er'Ass Mr. Luos's Avatar
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    Red Tint Jewelcoat
    2008 Trailblazer SS

    Quote Originally Posted by third_shift|studios View Post
    thanks! I meant the 550 and 150 lbs...
    All sets of springs are different front to rear.
    At least I am pretty sure they are. Different weight to hold up.

  2. #22
    Crazy Canuck ! Eugenio_SS's Avatar
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    triple-black
    2000 CamaroSS convertible

    Quote Originally Posted by third_shift|studios View Post
    thanks! I meant the 550 and 150 lbs...
    that means you need 550lbs of weight to compress the spring by 1"... ie 550lbs/inch
    you put 1100lbs, the spring will compress 2"
    When applying forces, you transfer weight around... the amount of weight transfer will compress the spring based on the amount of weight transfered... the spring will compress 1" for every 550lbs of weight transfered.

    For the back, same principle, but 1" for every 150lbs.
    So let's say you weight 150lbs, if you get in the trunk, the rear of the car should lower 1"

    Hope it makes sense.


    As for progressive, let's say a 300-500 lbs/in progressive spring...
    that means that when the spring is uncompressed, the rate is 300... ie takes 300lbs to compress 1"
    but as the spring compresses, the rate increases, requiring more weight for each inch as the spring compresses more.
    when spring is close to fully compressed in this example, you would require 500lbs for 1" of spring compression.
    The problem w/ progressive is proper dampings... ie shock adjustments.
    Shocks are meant to dampen springs and they do that by considering the spring rate.
    ie, they will critically damp a system given a constant spring rate... if you vary that, the damping ain't good anymore... you'd be either underdamped (oscillating), or overdamped (harsh, shock set too stiff for spring, impeding spring to do its job properly)
    so in this case, if you have adjustable shocks, you set them to ~400lbs/in... get a harsh ride on initial compression because shock overdamping the system, but if you get enough compression, the shock cannot handle the higher spring rate... hence the reason it doesn't make a good ride for confort nor for performance.

    That's why ppl that race, use linear springs, among other things.
    Last edited by Eugenio_SS; 06-07-2008 at 01:15 AM.
    Eugenio_SS
    almost stock triple-black 2000 SS convertible with 17x11s on all 4 w/ 315s at the track or on the street with 18x10.5s on all 4 w/ 315s: (1), (2)

  3. #23
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    White
    2001 Z28

    Get 'em while they're hot.... This is likely the last batch to sell for $275 shipped.
    Sam Strano
    SCCA National Champion (x6)
    SCCA ProSolo Class Champion (x5)
    2009 SCCA ProSolo Overall Champion
    Owner--Strano Performance Parts
    814-849-3450

  4. #24
    Slow'er'Ass Mr. Luos's Avatar
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    Red Tint Jewelcoat
    2008 Trailblazer SS

    Quote Originally Posted by Sam Strano View Post
    Get 'em while they're hot.... This is likely the last batch to sell for $275 shipped.
    Got mine in today.

    Should be on this weekend.

  5. #25
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    White
    2001 Z28

    I'm sure you'll be pleased.... If I remember correctly you have Pro-kits now, right? I always like a nice before/after comparision if you'd be so inclined.

  6. #26
    Slow'er'Ass Mr. Luos's Avatar
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    Red Tint Jewelcoat
    2008 Trailblazer SS

    I will once I have it all set.
    Springs are in. Do they settle at all?


    On the ProKit...



    On Strano's springs...

  7. #27
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    2001 Z28

    The height won't change much it at all. All springs will set a bit with use, you might see another 1/4" with time but normally it's not quite that much. Give it a few weeks. I'd recommend measuring on a level surface that you can repeat on later just to keep tabs on what's what.

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