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Go Back   E46Fanatics > Tuning & Tech > Suspension & Braking

Suspension & Braking
Have some questions about suspension or brake setups for your E46 BMW? Get all your answers here!

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Old 10-03-2012, 12:10 PM   #1
cityjohn
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vert /coupe use DIFFERENT struts?

I'm finding that despite the realoem part numbers being different, some vendors sell struts and shocks that they say fit both coupes and convertibles. Does anyone know what the real difference is?

What happens if you put the cheaper coupe shocks on a vert?
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Old 10-26-2012, 06:49 AM   #2
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Old 10-26-2012, 08:19 PM   #3
jlgone
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I have never seen any aftermarket struts specified as being for convertibles either. There are aftermarket springs (H&R) specifically for verts due to weight difference, and the factory sway bars are different vs coupes. Interestingly, when I looked at H&R's product list, the convertible and coupe used the SAME spring # but the cup kits had different numbers?? Perhaps they do use different shocks?

The ZHP struts are suposed to be different from the ZSP package but people frequently use bilsteins and konis as replacements on verts with no problems. There is an H&R cup kit (springs and struts) specifically for verts, but I don't know if the struts are different or just the springs.

Since the aftermarket struts are different from any of the Factory struts, you would be changing regardless if you go aftermarket Why pay $$ for BMW struts when Bilstein or Koni would be better?

Last edited by jlgone; 11-03-2012 at 08:36 AM.
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Old 10-27-2012, 12:43 AM   #4
lucky_doggg7
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I was just looking at a Bilstein German catalog stored in my iBooks, and saw that Bilstein only lists one rear shock for both the Coupe and Convertible M3. Wish I knew how to use this thing better so I could attach the darn thing so you can see....

I can see where your concern is, heavier sled = needs more damping. This is where adjustable shocks like on a PSS9/PSS10 would be helpful so you could just "click" to the setting you like.
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Old 10-27-2012, 03:47 AM   #5
cityjohn
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Thanks guys. It makes sense that knowledgeable aftermarket mfrs would know what they're doing. And I can definitely see the sense in getting better aftermarket albeit same-as-coupe shocks instead of paying more for BMW Sachs.
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