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Old 07-24-2015, 07:06 PM   #1
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When I recently did some work refreshing my 2001 boxster base suspension with 110k miles, I found the front bump stops were totally obliterated (big missing chunks). My suspension was frequently bottoming out as a result! I would closely look at your front bump stops when doing suspension work. Aftermarket OEM bump stops for the front are available for cheap, so consider just lining those up for changing out. My rear bump stops, on the other hand, seemed to be in very good shape (although I changed them out anyway, it was not really necessary). All my strut mounts seemed to be in good shape (and although I changed my front strut mounts out anyway, it was not really necessary). My front strut bearings were in good shape - I cleaned and rebuilt them with fresh silicone grease. My ball joints and tie rod end were in pretty good shape, but with 110k miles, I popped off the top clips, rotated them 90 degrees, and added some fresh grease to keep them happy and noise free. My rear "track arms" are making noise so I'm considering whether to remove them and peen the ball joint (to rebuild), or replace with new.

Of aftermarket Bilsteins, be aware that they are monotube which can make more roughness and noise than twin-tube (based on my observation using them on other cars). My factory 2001 base struts were Bilstein twin-tubes, FYI. Konis, now available for the 986 in two different styles (sport and "FSD"), makes a top-quality twin tube that probably cost about the same as a Bilstein, and if you're in the market for new set of struts, I would recommend seriously considering a set of Konis of some sort.
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Old 07-24-2015, 07:36 PM   #2
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Quote:
Originally Posted by jakeru View Post
Of aftermarket Bilsteins, be aware that they are monotube which can make more roughness and noise than twin-tube (based on my observation using them on other cars). My factory 2001 base struts were Bilstein twin-tubes, FYI. Konis, now available for the 986 in two different styles (sport and "FSD"), makes a top-quality twin tube that probably cost about the same as a Bilstein, and if you're in the market for new set of struts, I would recommend seriously considering a set of Konis of some sort.
I thought the Boxster came with monotube struts? So the currently available Bilstein HD and Sport struts aren't OEM equivalent?
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Old 07-24-2015, 09:54 PM   #3
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Originally Posted by hancock1701 View Post
I thought the Boxster came with monotube struts? So the currently available Bilstein HD and Sport struts aren't OEM equivalent?
Factory shocks are twin-tube, according to any specs I've seen from Porsche. ( Example from: http://press.porsche.com/archive/products/press_kits/press_kits_2001/PDF/24-29_RELEASE.pdf )

"dual-tube gas-charged shock absorbers provide flat cornering." (emphasis added)

Bilstein aftermarket products should be easy to find out whether they are twin-tube or monotube. (They may offer more than one option).

Actually, I just looked up some specs on bilsteinus's site and it does see that most aftermarket Bilstein options are indeed twin-tube (not mono tube as I initially would have guessed).
Bilstein, Innovation and High Quality Since 1873
Lists three shock replacement options (B4 OE equivalent, B6 HD, and B8 Sport) all indicated as "twin tube strut assembly".

So I guess I stand corrected and actually the aftermarket Bilstein struts for this application are actually twin tubes, just like OE shocks.
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Old 07-24-2015, 10:16 PM   #4
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Now this is strange... Bilstein Europe is indicating mono tube shocks for their 986 aftermarket struts


Parts catalogue

They are advertising "B6 Sport" and a "B8 sprint" aftermarket options on the Bilstein Europe catalog.

(If you actually get to looking at a Bilstein strut, usually whether it's twin tube or mono tube is pretty obvious as the monotone is usually mounted "upside down" with huge-looking shaft exposed (because that's actually the tubular part of the mono tube).

Might just be a case of the U.S. Bilstein catalog being transcribed incorrectly. I'd think a call to Bilstein tech support should be able to clear up what the design of their aftermarket product actually is.
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