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90Q 2.3 Rear shock absorbers?

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  • 90Q 2.3 Rear shock absorbers?

    Happy new year everyone!
    New year, new problems. So my rear shocks both have leaked out, looking at replacements it seems like only available brands are Magnum technology which has proved to be terrible brand in my experience and Bilstein which i have 0 experience with, from what I know they are ''get what you pay for'' brand. (Some stores offer KYB suprisingly, but, again, mixed reviews).
    I was told in different forums that sachs performance and other brands have discontinued them 6 years ago. One of the options I got offered is to take 80 b3 front struts, cut off all the steering bits and put them in the back. 2nd option offered is to take C3/C4 socks and modify threads on the strut.

    Wanted to ask has anyone ever done any of these hack'ish methods and can point me to/explain them in bit more detail? Maybe someone has experience with Bilstein/KYB? Problem I'm facing is roads around here that are ''sub optimal'' to say the least so I'm looking for somewhat decent solution that won't end up with shock replacement after a year or two.

  • #2
    If you want decent then bilstein fit the bill!

    Original fit for many manufacturers which gives them some credibility in my book. Bilstein B4 are the 'standard' replacement and B6 are the uprated level. I'm not sure about B4 but, the B6 can be rebuilt if you ever kill them on your sub optimal roads ​​​​​​

    I've got B6 on my cq20v with the factory 15inch wheels with standard s2 springs and I like it very much - firm, good control and importantly it does not crash and bump on bad roads.

    The B6 were factory approved tuning upgrade for audi back in the early 90's and original fit for the saab 99 turbo when that was launched in the 70's.


    • #3
      Putting a damper on "hack'ish methods"...

      Firstly, for myself and others reading, please confirm, perhaps you have a 1988 - 1992 B3 chassis quattro sedan (four-door) with the long and tall rear MacPherson struts which sites the main springs above the wheel (as opposed to the short coil-overs of the later B4 chassis cars (with main springs behind the wheel) on the rear, correct? If not I apologize for the following.

      Certainly that 2nd option you list above would void any part warranty and make future replacement equally convoluted. I do think most folks should stay with near to stock components.

      I also 2nd Steve's remarks above and would add that a very satisfactory and durable rear damper install is entirely achievable using some care and all very nearly stock original parts. The Bilstein B4 dampers are not rebuild-able. There is possibly an authorized Bilstein rebuild facility (that can fix B6s and B8s) not too far from you.

      Although I've no experience with other than Boge, Koni & Bilstein, I see no need, nor good reason to not simply re-fit your original rear struts with fresher dampers inside; and Bilsteins are a reputable and popular choice I also prefer. Over worn ones, fresh OEM dampers alone in the original struts on the rear will restore some of the car's original positive steering feel on initial turn-in as you approach a corner, and they will add to the car's stability at highway speeds, and even though the B6s will add more of this than the B4s or other stock equivalents for a more enthusiast oriented ride, my experience with B6s is, installed as per below, they are not at all uncomfortable on imperfect roads.

      Although lengthy, please have a look at this: Billie into MacStrut...

      Also know that I have widgets to flog, but even if you choose otherwise, consider that even the best dampers by themselves, cannot on their own deliver their best performance. A total install overview that encompasses renewing all the suspension mounting points is necessary for a most durable and satisfying result. Often over-looked and dismissed as of little importance, those hinge points and top-mounts are ordinarily some of the easiest and fastest wear items to fail on this chassis. Particularly at the rear, poor suspension hinges and mounts will act as the tail that will wag the dog. Replacing these with more durable items which will remain precise and quiet far longer, will add to your driving enjoyment and subtract from future maintenance time and expense.

      To that end, perhaps these may be of interest:

      For Boge A-arm bushings only...

      For Boge top-mounts only...
      Last edited by Lago Blue; 9th January 2020, 22:47.