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J STOCK springs are BACK!!!!!!!!!

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  • mlytle
    replied
    I am gonna guess that was part in the problem. The Billy DAMPER was too long for spring allowing inside rear wheel to move uncontrolled.

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  • kevnj
    replied
    Mlytle the Koni DAMPENERS, 8041 1289SPGC are ~ 1 inch shorter than the Billsteins. I didn't get a chance to drive the dampeners in dampening conditions .

    Leave a comment:


  • mlytle
    replied
    Originally posted by kevnj View Post
    Quick update. I have since installed Koni "Race" SA's from Ground Control and the dampening is perfect. Gonna get the Bilstein Sports re-valved properly to J-Stock specs and sell them if anyone is interested.
    was the extended length of the koni the same as the billy?

    ps - it is "damping" not "dampening"....unless you mean you were getting them wet driving through puddles....

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  • kevnj
    replied
    Quick update. I have since installed Koni "Race" SA's from Ground Control and the dampening is perfect. Gonna get the Bilstein Sports re-valved properly to J-Stock specs and sell them if anyone is interested.

    Leave a comment:


  • mwagner10702
    replied
    Originally posted by Yahweh View Post
    What about the B46-1720 in b8 from?
    Does Bilstein make such a version? Looks like it is a B6 variant. Assuming the length is the same as the B46-1720, the 33-187563 would still need to be revalved, unless it has the crimped housing.

    Regarding the "period correct" thing, if you look in the BMW Motorsport Gruppe N catalog for the E30 M3 you will find the Bilstein 24-000642 (BMW part number is 33 52 2 222 588) so it is very period correct. Plus your 33-187563 would not be period correct in any event.

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  • Yahweh
    replied
    What about the B46-1720 in b8 from?

    IE
    F4-BE5-H341-H0 or 33-187563

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  • Yahweh
    commented on 's reply
    Hoping to keep inverted per a nice "period" correct Kit.

    Small differences add up.

    E350 with Quigley 4x4 used to run the B46-1720 damper re valved up front until the same issue. Looks like now people run FOX shocks..

    GC does have an inverted koni, unless you have a P/N... GC wont sell it individually, as described its for their true coil over rear "kit"
    Maybe the inverted koni is a monotube and would match the front better..

    The 24-000642 Group N sounds like the only entry level bilstein option, and also not the 200/125 valving. Which optimally makes this a great package.
    Unfortunately doesn't check the inverted box, which is optional....

  • mwagner10702
    replied
    Originally posted by Yahweh View Post
    Inverted Shorten'd Koni?

    Maybe the substitute for the rear Bilstein.

    I have a set of the Jstock Bilstein fronts from turners recent mystery set, Looking for Inverted rears to match..
    No inverted and shortened Koni that I am aware of. IMO the inverted rear shock is overrated for street or light track. Even if you are a serious racer I'd doubt you could tell the difference between an inverted rear and a non-inverted rear. The unsprung weight loss is minimal.

    Assuming you are using the J-Stock springs, I would get the Bilstein Motorsports rears (24-000642). They are correct for that spring length. The valving is 200/200. The rear J-Stock rear springs are 7" long. If you are using a shorter spring than that just go with the Ground Control Konis. They have a shorter overall length and are intended to be used with a shorter spring.

    If you must have an inverted rear, find an early set of the Bilstein B46-1720 with an H0 suffix. These shock housings are not crimped. The most current production B46-1720 shocks have a crimped housing and cannot be revalved. See post #308.

    Leave a comment:


  • Yahweh
    replied
    Inverted Shorten'd Koni?

    Maybe the substitute for the rear Bilstein.

    I have a set of the Jstock Bilstein fronts from turners recent mystery set, Looking for Inverted rears to match..

    Leave a comment:


  • kevnj
    commented on 's reply
    Thanks for the info, will report back with the results.

  • mwagner10702
    replied
    Ken -

    If you are going to get the GC front Konis ask them if they can revalve the rears (8041-1289spgc) to work with 1000lb springs and get a set of their rear bump stops. The Konis they use are shorter in overall length which will work with a 5" spring (I have their rear Konis). I wouldn't use an extended RSM.

    If you move from the Bilsteins to the front Koni inserts you'll need a new pair of strut housing caps. Use part number 31 32 1 117 376.

    Leave a comment:


  • kevnj
    replied
    Cool enduro car. I own a M3 as well and have built the non-m to be the track toy. In the shadows there's still a bunch of people on S14.net who actively track there cars. There's a WEALTH of knowledge to be shared. I'm going to get the Bilstein dampeners re-valved to proper J-Stock specs once I get dyno plots to ensure there are no more disconnects.

    For the front inserts, I am now leaning towards doing the Koni SA's from GC as they are valved correctly for 700lb springs and allow me to get the ride height where I want it to be. For the rear I will either use the Bilsteins with an extended height rear shock mount or see if I can find something adjustable that can handle the 1K springs in the ~$250 a dampener price range.

    Leave a comment:


  • redneckvtek
    replied
    Originally posted by kevnj View Post

    Sorry if my posts have annoyed anyone, just an enthusiast trying to learn and share my experiences with the community.
    I apprecieate your posting bud, as another non-M e30 owner intruding on s14.net in order to get some J-stocks in my life. Overall, this forum has been a massive help to my race team and my suspension knowledge.

    I love your orange E30 - the ES front valence + plastic bumpers looks awesome.

    Plus, my E30 is the same color Orange, and also has a 4v swap (m54b25)

    Click image for larger version

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    Regarding the B6 struts - From what I understand from my bilstein contact, they are "taller" due to internal bump stop differences (when comparing RWD B6+B8). If needed, I can try and get more info for the front IX inserts.

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  • mwagner10702
    replied
    IIRC the iX inserts are 3" shorter. Unfortunately Bilstein only offers the B6 not the B8. Probably a difference in valving which you will be changing anyway.

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  • kevnj
    commented on 's reply
    Oh got it, yeah guess we were having two different conversations. I have seen that video, was watching it last night. I may go with e30 IX inserts, they maybe the ticket as they are shorter.

    Like anything all the tinkering can be fun but when you add up your time and the cost to go through a few iterations it ends up costing substantially more. You do tend to learn something so I guess that has value too.
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