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PSA: Turner J Stock Springs are Available Again

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    PSA: Turner J Stock Springs are Available Again

    Just ordered a set after waiting and searching about 5 years.

    https://www.turnermotorsport.com/BMW...08-bmw-springs

    I'll confirm once received, but I believe this is real!

    Discussion on S14.net

    https://s14net.vbulletin.net/forum/s...rings-are-back

    Funny, the J stock Bilstein shocks were available for years after the springs went NLA. Now the shocks are unobtainium!
    Last edited by ed94r; 01-09-2020, 03:25 AM.
    1988 E30/S50...now with S52; Track
    1994 Miata R; ES Solo2
    1998 Lexus LX470; Wife (Slee'd anyway)
    2002 BMW 530i; A+ Commuter
    2002 BMW 325iT; Sport/Premium 5-speed
    2011 21' EconoTrailer

    #2
    I have rear shocks that will work for the kit, as the originals can't be serviced to be revalved to Jstock.
    Zach@Zakspeed.us

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      #3
      Demon Tweaks in the UK has the Group N rear shocks in stock, I just got a set last week. They are about $500 shipped to the US. They might have the fronts as well, I didn't check on those.

      For the rears, just ask them for Bilstein 24-000642.

      The valving is 300/300 for the front, and 200/200 for the rear. If you have a set of front Bilsteins that aren't crimped, you can send them to RE Suspension Inc in NC to be revalved to the 300/300 spec.
      Last edited by Digitalwave; 01-13-2020, 09:59 AM.

      Comment


        #4
        Originally posted by Digitalwave View Post
        Demon Tweaks in the UK has the Group N rear shocks in stock, I just got a set last week. They are about $500 shipped to the US. They might have the fronts as well, I didn't check on those.

        For the rears, just ask them for Bilstein 24-000642.

        The valving is 300/300 for the front, and 200/200 for the rear. If you have a set of front Bilsteins that aren't crimped, you can send them to RE Suspension Inc in NC to be revalved to the 300/300 spec.
        Good info to know. I managed to get a set of the un-crimped J stock bilsteins a few years ago, with the inverted rears...so I'm good now with the whole kit but others may benefit from this.

        Thanks
        1988 E30/S50...now with S52; Track
        1994 Miata R; ES Solo2
        1998 Lexus LX470; Wife (Slee'd anyway)
        2002 BMW 530i; A+ Commuter
        2002 BMW 325iT; Sport/Premium 5-speed
        2011 21' EconoTrailer

        Comment


          #5
          What is better about these for our cars VS konis or B8's? Ive been looking for alternative's to them because neither really are ideal from what ive read.
          91' 318is 90' 325is

          Originally posted by Sonny
          Buy the E30s, they ain't gonna last long
          E30 can make you, E30 can break you
          "He who controls the Nova's, controls the Boomers"

          Comment


            #6
            Originally posted by Motheye99 View Post
            What is better about these for our cars VS konis or B8's? Ive been looking for alternative's to them because neither really are ideal from what ive read.
            What exactly are you referring to by "these"? If you mean the J-stock or Group N shocks versus Konis or B8s, it's mainly that both off the shelf Koni and B8's are too soft (underdamped) for the quite stiff J-stock springs. You could always just revalve Konis or B8's to J-stock valving if you wish. Just be careful because brand new E30 B8's are probably crimped and can't be revalved or rebuilt.

            Comment


              #7
              Originally posted by Motheye99 View Post
              What is better about these for our cars VS konis or B8's? Ive been looking for alternative's to them because neither really are ideal from what ive read.
              To extend on wave's comment, the J Stock set-up is a system that was devised to work as a system. Not the best, not the worst, but a system to capitalize on a rule set of the time. There are plenty of E30 set up options, the J stock being one option to entertain if you want to retain the stock spring OD. If I were setting up a car without nostalgia concerns, I would look elsewhere for more reasonable options that could deliver same/improved results.

              The J Stock set up is inherently a compromised set up from the start, but likely one of the best choices if you want to go with the stock spring OD, which is where the compromise lies.





              1988 E30/S50...now with S52; Track
              1994 Miata R; ES Solo2
              1998 Lexus LX470; Wife (Slee'd anyway)
              2002 BMW 530i; A+ Commuter
              2002 BMW 325iT; Sport/Premium 5-speed
              2011 21' EconoTrailer

              Comment


                #8
                The J-Stock setup, both the spring rates and the damper valving, was based on the E30 M3 Group N settings. There are 3 main considerations:

                1) The J-stock springs are progressive, not linear like the Group N coilovers were.

                2) The J-stock dampers were "stock length" front strut inserts, which are travel limited (especially if you don't trim the bump stops!), and don't require cutting your strut housings

                3) The J-stock springs were stock diameter, which don't require cutting your strut housings (but severely limit how much camber you can run in the front)

                So yeah, other than nostalgia, there are other methods to achieving a similar setup these days. If you went with a coilover setup, you can run more front camber, run a shorter shock insert for more bump travel, and just run similar spring rates on a linear coilover spring. This will likely require custom valved dampers no matter what you go with, as OTS Koni and Bilstein are probably well underdamped for the spring rates (Group N dry setup started at 680F/1027R and went all the way up to 1369F/1825R!!!).

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