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      02-12-2017, 04:29 PM   #1
alexwhittemore
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Tips while replacing shocks?

I've got a 2009 E90 that's leaking on at least two corners, and it's reasonably overdue to get those shocks swapped out. I'm planning to get some aftermarket parts and swap them out myself, probably some B4s or konis. The question is, there's a good chance in my mind that I'll find some other worn components while I'm in there, probably bushings or something. So questions:

1) in absence of noticeable symptoms, is it actually likely I'll find any other components worn enough to need replacement? Or am I just looking for trouble without much reason? The car's got about 110k on it at this point, and the shocks have been at least subpar for 20 or 30k (so lazy).

2) What should I look for in inspecting it ahead of time, so I can make sure to have any necessary replacement bits on hand? For the components I might need to replace, what do they look like worn vs good?

I mostly want to make sure I don't waste a saturday taking apart my suspension and putting it back together, only to find I need more than just the shocks.
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      02-13-2017, 05:14 PM   #2
TheeGovernor
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I would check the front control arm bushings. Get new hardware for the rear shock mounts. Check tie rods for play. Consider getting new upper strut mounts as they are rubber and known to compress over time. Plus they have a bearing in them. Also I would lean towards Blisteins as Koni quality has gone down in my experience.
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      02-13-2017, 05:27 PM   #3
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Along with struts up front and shocks in the rear, you should also replace the following components that accompany these two items

Front:
Strut Mount (Guide Support)
Bump Stop
Dust cover
Lower spring pad (maybe)

Rear:
Upper shock mount (guide support)
Dust cover
Lower shock mount (guide support)
Supporting cup (only if badly rusted, most likely ok)
Bump Stop with attached Dust cover
Shock absorber mount (bottom at the control arm)
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      02-13-2017, 06:00 PM   #4
alexwhittemore
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Thank you both! Exactly what I'm looking for.

Quote:
Originally Posted by TheeGovernor View Post
I would check the front control arm bushings. Get new hardware for the rear shock mounts. Check tie rods for play.
I suppose you mean in the front specifically? What does "play" mean - I can move them around with less than a bunch of effort? Or will they flap in the breeze if the ends are done?

Quote:
Consider getting new upper strut mounts as they are rubber and known to compress over time. Plus they have a bearing in them.
It does feel like it's harder to put snow cables on than it used to be, but then maybe I'm just making that up in my head.

Quote:
Also I would lean towards Blisteins as Koni quality has gone down in my experience.
Fair enough. IIRC - the B4 are a stock e90 replacement, the B6 are a stock replacement with sportier performance, and the B8 are a sport package only compatible sport replacement?
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      02-14-2017, 09:09 AM   #5
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Sachs and Bilstein are OEM suppliers for struts and shocks.

Bilstein B4 come in Standard suspension and Sport suspension.

Bilstein B6 is a completely different unit. I believe it is a lot stiffer.
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      02-14-2017, 02:28 PM   #6
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For tie rods and control arm bushings you can lift the front of your car in the air. Put you hands at 9 and 3 oclock and wiggle a feel for play. Same for 12 and 6 oclock. Also look at control arm bushing connected to the subframe and look for a fluid leak. You can also stick a bar between the control arm and subframe and look for movement. It should be pretty stiff. Also vibration during braking could be caused by these things.
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      02-14-2017, 09:00 PM   #7
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How many miles? 328 or 335?
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      02-15-2017, 06:08 PM   #8
alexwhittemore
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Quote:
Originally Posted by mweisdorfer View Post
How many miles? 328 or 335?
101k, 328.
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      02-15-2017, 10:07 PM   #9
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Quote:
Originally Posted by alexwhittemore View Post
Quote:
Originally Posted by mweisdorfer View Post
How many miles? 328 or 335?
101k, 328.
I would put the B4's on the car and replace all of the surrounding hardware. Don't waste your money on higher end shocks & struts that are really made for a 335. B4's do come in a sport version, if you want an upgrade.

Hardware would be

Front :
Bump stops
Strut bearings
Rubber mounts for springs

Rear :
Upper, upper shock mounts
Upper lower shock mounts
Bump stops
Lower shock mounts

ECS tuning and FCP Euro do make kits.

Your probably looking at $600.00 total in parts, should you go this route.

Tie rods, control arms, subframe bushings, differential bushings, Transmission mounts, engine mounts -----

That's a whole other topic.

I would not start to worry about those till you get your suspension done and maybe get to 115-125k.
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      02-15-2017, 10:08 PM   #10
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Quote:
Originally Posted by alexwhittemore View Post
Quote:
Originally Posted by mweisdorfer View Post
How many miles? 328 or 335?
101k, 328.
I would put the B4's on the car and replace all of the surrounding hardware. Don't waste your money on higher end shocks & struts that are really made for a 335. B4's do come in a sport version, if you want an upgrade.

Hardware would be

Front :
Bump stops
Strut bearings
Rubber mounts for springs

Rear :
Upper, upper shock mounts
Upper lower shock mounts
Bump stops
Lower shock mounts

ECS tuning and FCP Euro do make kits.

Your probably looking at $600.00 total in parts, should you go this route.

Tie rods, control arms, subframe bushings, differential bushings, Transmission mounts, engine mounts -----

That's a whole other topic.

I would not start to worry about those till you get your suspension done and maybe get to 115-125k.
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