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Thread: Compression and rebound settings after installing stiffer springs?

  1. #1
    Join Date
    Feb 2003
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    BKLYN, NY
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    1998 M3/4/6

    Compression and rebound settings after installing stiffer springs?

    I recently installed slightly stiffer springs with my KW V3 coilovers. I had previously dialed in my suspension settings for 450F/500R springs and now i installed 500F/600R springs.

    I havent changed the compression or rebound after installing new springs. I do notice the stiffer springs when driving but the suspension still feels okay(most likely because it was a very slight spring increase and not drastic).

    I was wondering if there was a general rule for compression and rebound adjustment when increasing spring stiffness. Like, if you install stiffer springs, you should soften compression and rebound for a better ride or vice versa.
    Thanks.

  2. #2
    Join Date
    Mar 2007
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    E39 hamster/ruberbandPWR
    Why did you install higher spring rates ?
    I would contact KW, and ask what they recommend.

  3. #3
    Join Date
    Feb 2003
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    Well, its mostly a HPDE car now but i had to disassemble the front suspension to fit 18x9 255/35/18 tires. The previous springs were a little rusty and i just decided to upgrade them since i had everything out.

    I tried the recommended KW settings with the kw springs and it was no good at all. It was too soft and loose. I had to go much stiffer on both rebound and compression. When i go to the track i stiffen the rebound 180 degrees stiffer for both front and rear. I also increase 2 clicks of compression stiffer for both front and rear.

    I was just wondering if there was a general rule about rebound and compression when increasing spring rates. Maybe there is no adjustment needed.

  4. #4
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    For anyone looking for an answer to my original question.

    I found someone asking the same question in a Porsche forum. Someone replied that a Bilstein engineer told them they should stiffen rebound and soften compression as a general rule. Take it for whats its worth. 2nd hand knowledge on an internet forum.

  5. #5
    Join Date
    Nov 2005
    Location
    Wakefield, MA
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    2,643
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    '97 M3, '17 GSW 4Motion
    That's right. A stiffer spring rebounds with more energy so you need to increase rebound damping for the same response.
    COMSCC T70 E36 M3

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