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How to: e28 Suspension Install

E28 technical advice asked and given! Troubleshooting, modifications and more.
MLastovo
Posts: 1472
Joined: Feb 12, 2006 12:00 PM
Location: San Diego, CA AKA The Best Coast

Post by MLastovo »

BuzzBomb wrote:
MLastovo wrote:
Frybrid 524td wrote:
MLastovo wrote:
Frybrid 524td wrote:They'll start to sag over time.
Agreed. Please note that all springs under load will sag over time.

Do you have any historical data on BAS spring performance?

If so, do you have same/similar data to compare to other brands and/or stock springs?
r/
D.
Of course all springs under load will sag with time but based on anecdotal evidence shared numerous times here on the forum, BavAuto springs tend to sag prematurely.
Any chance you have the posts indexed?
I've been around since before Roachfly and don't recall ever reading any posts but I may have missed one.
r/
D.
:duel:
Antknee,
Not at all. I am simply attempting to find the info that validates the statement.
Without data the claim is without merit.
r/
D.
pstl_pete
Posts: 112
Joined: Oct 11, 2011 4:54 PM
Location: Toronto / Windsor, ON

Post by pstl_pete »

From what I recall, the front Bilsteins have built in bump stops, the rears do not. I remember stopping the install to check into this since I wasn't sure whether I should cut the bump stops or use them.

I double checked the front and rear springs and the writing is right side up so they are properly installed.

I too am a bit skeptical on sagging, heard lots of stories about sagging springs yet have never encountered or seen the issue.
Frybrid 524td
Posts: 2689
Joined: May 27, 2009 11:42 AM
Location: ...

Post by Frybrid 524td »

MLastovo wrote:
BuzzBomb wrote:
MLastovo wrote:
Frybrid 524td wrote:
MLastovo wrote:Agreed. Please note that all springs under load will sag over time.

Do you have any historical data on BAS spring performance?

If so, do you have same/similar data to compare to other brands and/or stock springs?
r/
D.
Of course all springs under load will sag with time but based on anecdotal evidence shared numerous times here on the forum, BavAuto springs tend to sag prematurely.
Any chance you have the posts indexed?
I've been around since before Roachfly and don't recall ever reading any posts but I may have missed one.
r/
D.
:duel:
Antknee,
Not at all. I am simply attempting to find the info that validates the statement.
Without data the claim is without merit.
r/
D.
As I mentioned, I based my statement on the anecdotal evidence offered by other members here. Without spending too much time, a quick search brought up numerous threads in which the sagging issued was mentioned.
http://www.mye28.com/viewtopic.php?t=33866
Shawn D. notes the Bav Auto sagging issue.
http://www.mye28.com/viewtopic.php?t=35905
See C.J.'s comments.

If you need more data, D., PM me or just conduct a search. This is getting long-winded and off topic for the thread. It's an Internet forum, the majority of things said here are not backed up with data. People share their first-hand experience for the benefit of others. Since numerous people have found BavAuto springs to sag prematurely, I thought it was worth mentioning to the OP. I do not have Bav Auto springs due to the warnings of others here. My spring experience lies with OE and Dinan.
MLastovo
Posts: 1472
Joined: Feb 12, 2006 12:00 PM
Location: San Diego, CA AKA The Best Coast

Post by MLastovo »

Frybrid 524td wrote:
MLastovo wrote:
BuzzBomb wrote:
MLastovo wrote:
Frybrid 524td wrote:Of course all springs under load will sag with time but based on anecdotal evidence shared numerous times here on the forum, BavAuto springs tend to sag prematurely.
Any chance you have the posts indexed?
I've been around since before Roachfly and don't recall ever reading any posts but I may have missed one.
r/
D.
:duel:
Antknee,
Not at all. I am simply attempting to find the info that validates the statement.
Without data the claim is without merit.
r/
D.
As I mentioned, I based my statement on the anecdotal evidence offered by other members here. Without spending too much time, a quick search brought up numerous threads in which the sagging issued was mentioned.
http://www.mye28.com/viewtopic.php?t=33866
Shawn D. notes the Bav Auto sagging issue.
http://www.mye28.com/viewtopic.php?t=35905
See C.J.'s comments.

If you need more data, D., PM me or just conduct a search. This is getting long-winded and off topic for the thread. It's an Internet forum, the majority of things said here are not backed up with data. People share their first-hand experience for the benefit of others. Since numerous people have found BavAuto springs to sag prematurely, I thought it was worth mentioning to the OP. I do not have Bav Auto springs due to the warnings of others here. My spring experience lies with OE and Dinan.
Thanks for the links and I concur on the spin off.

As a side note I'm running BAS/Billie Sports since 2002 (installed in April in prep for the first 5er Fest) on my DD and have about 100k miles on 'em. No track days just SoCal driving primarily on San Diego's NASTY streets. No regrets.

I have driven many miles (low hundreds) on several occasions on both Dinan and Eibachs and found the Dinan setup the better of those two. I picked the BAS's for the drop and the soft, yet progressive, ride/stance.
r/
D.
shagrath
Posts: 14980
Joined: Jun 15, 2009 12:21 PM
Location: pLace

Post by shagrath »

My BAS springs are fine and I have had them on now almost 3 months.

A little soft in the back for me but otherwise i like em enough for what I do. I plan to install e90 drophats at some point.
miamibeamer
Posts: 22
Joined: Nov 18, 2011 8:26 PM
Location: Miami FL

Thanks

Post by miamibeamer »

Thanks for taking the time to document the install. I'm planning to tackle on the same project before end of year.
Nebraska_e28
Beamter
Beamter
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Post by Nebraska_e28 »

shagrath wrote:My BAS springs are fine and I have had them on now almost 3 months.

A little soft in the back for me but otherwise i like em enough for what I do. I plan to install e90 drophats at some point.
A little soft as in they bottom out or jus very comfy?
BuzzBomb
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Joined: Aug 21, 2011 12:14 AM
Location: SoCal

Post by BuzzBomb »

Also, just as an FYI, the photo of the rears during assembly show the bump/dust boot put together backwards. The foam bumper is an extension of the boot, the convex cut facing up. It's not meant to disappear inside the boot itself.
shagrath
Posts: 14980
Joined: Jun 15, 2009 12:21 PM
Location: pLace

Post by shagrath »

Nebraska_e28 wrote:
shagrath wrote:My BAS springs are fine and I have had them on now almost 3 months.

A little soft in the back for me but otherwise i like em enough for what I do. I plan to install e90 drophats at some point.
A little soft as in they bottom out or jus very comfy?
Sorry I did not respond to this. Never saw it.

Both. Very comfy in the back, but with three kids and a trunk full of groceries she will bottom out a little on extreme bumps.
dude8383
Posts: 229
Joined: Mar 11, 2013 11:14 AM
Location: Brooklyn, NY

Re: How to: e28 Suspension Install

Post by dude8383 »

BuzzBomb wrote: Correct procedures are:
1 No, pliers aren't used for that. Use the right tool.
Where does one find said "right tool"

Bilstein never includes it with their shocks
EtaMonkey
Posts: 168
Joined: Sep 22, 2010 11:24 PM
Location: Minneapolis

Post by EtaMonkey »

I too am curious about what the right tool is called and where I can get one.

I just ordered the same stuff from Bavauto and am hoping to tackle the job in the next couple of weeks.

Might save for some brakes/rotors while I'm waiting 1-2 weeks for some parts to come in.
Blue Shadow
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Joined: Feb 12, 2006 12:00 PM
Location: SE PA

Post by Blue Shadow »

I wonder if those pliers are calibrate to put 103 pound-feet of torque on the Bilstein strut retaining nut as specified on the Bilstein tool for the task?

The rear shock mount nuts are the reason the gearwrench tools were developed. No patience needed, just plop the 13 on there and zing those things off and on.
1st 5er
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Contact:

Post by 1st 5er »

Blue Shadow wrote:The rear shock mount nuts are the reason the gearwrench tools were developed. No patience needed, just plop the 13 on there and zing those things off and on.
I no dats rite. :lol:
John in VA
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Joined: Feb 12, 2006 12:00 PM
Location: Leesburg, VA

Post by John in VA »

EtaMonkey wrote:I just ordered the same stuff from Bavauto and am hoping to tackle the job in the next couple of weeks.
Might save for some brakes/rotors while I'm waiting 1-2 weeks for some parts to come in.
Are people still buying from them? I found you could always buy cheaper. You wouldn't need to save up if you were shopping with BluntTech or AutohausAZ. I understand Bav will match prices, so I hope you are taking advantage of this.
davintosh
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Post by davintosh »

1st 5er wrote:
Blue Shadow wrote:The rear shock mount nuts are the reason the gearwrench tools were developed. No patience needed, just plop the 13 on there and zing those things off and on.
I no dats rite. :lol:
Might have to try that. I was planning on dropping a socket on an extension through the rear shelf, since I already have it off, but...

BTW: Nice writeup, pstl_pete! :up:
BuzzBomb
Posts: 1672
Joined: Aug 21, 2011 12:14 AM
Location: SoCal

Re: How to: e28 Suspension Install

Post by BuzzBomb »

dude8383 wrote: Where does one find said "right tool"

Bilstein never includes it with their shocks
Image

Call Bilstein. Ask nicely(like I did) and they'll send you one.
EtaMonkey
Posts: 168
Joined: Sep 22, 2010 11:24 PM
Location: Minneapolis

Post by EtaMonkey »

Guess my email filtered out the replies to this thread? I'll have to try calling Bilstein, Bavauto doesn't have the tool and said to use a pipe wrench with something soft to protect the nut. I asked about torquing to specific values and they said - nope, can't do it.

I am actually in the process of trying the rear suspension now. I've removed the 22mm bolt from the bottom and the (3) 13mm from the towers. The shock/spring assembly isn't budging. I've tried tapping pushing and prying - nothing. Advice?
I've generously applied rust blaster and am waiting for something to happen. Perhaps the last person didnt put a gasket i between the top and the tower?
1st 5er
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Post by 1st 5er »

BFH.
EtaMonkey
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Post by EtaMonkey »

A properly administered side kick released it from the trailing arm. Tae Kwon Do paying off 28 years later :banana:
1st 5er
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Post by 1st 5er »

Busted loose many a stuck wheel using that technology.
Metal parts usually get something equally hard, ie. BFH.
SPF2006
Posts: 595
Joined: May 01, 2010 9:26 PM
Location: Baltimore, Maryland

Post by SPF2006 »

Very helpful thread -- also attempting this job now (with the usual problems) and the photo documentation is a big assist.
EtaMonkey wrote:I am actually in the process of trying the rear suspension now. I've removed the 22mm bolt from the bottom and the (3) 13mm from the towers. The shock/spring assembly isn't budging. I've tried tapping pushing and prying - nothing. Advice?
I've generously applied rust blaster and am waiting for something to happen. Perhaps the last person didnt put a gasket i between the top and the tower?
e24mpwr
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Re: How to: e28 Suspension Install

Post by e24mpwr »

BuzzBomb wrote:
dude8383 wrote: Where does one find said "right tool"

Bilstein never includes it with their shocks
Image

Call Bilstein. Ask nicely(like I did) and they'll send you one.
Getting ready to do this on the M635. Going Bilstein Sport all around. Did they indicate how to torque? I have 1/2" and 3/8" torque wrenches, but don't see how is user them with that collar...
BuzzBomb
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Post by BuzzBomb »

The driver of the torque wrench fits into the square hole under thumb in that picture.
e24mpwr
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Post by e24mpwr »

BuzzBomb wrote:The driver of the torque wrench fits into the square hole under thumb in that picture.
Color me embarrassed. :oops: (and thanks!)

Looks like 3/8"?
BuzzBomb
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Post by BuzzBomb »

e24mpwr wrote: Looks like 3/8"?
There's one way to find out... ;)
e24mpwr
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Post by e24mpwr »

Got my ring in the mail today - that thing is sturdier (and bigger) than I expected.
Last edited by e24mpwr on Apr 10, 2014 6:42 AM, edited 1 time in total.
LarryM
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Joined: Feb 01, 2008 11:40 AM
Location: SoCal

Post by LarryM »

I'm still a bit confused on the external bump stops and protective boots, and when they're needed. Someone previously said Bilsteins have internal bump stops, but it seems to me like something's missing.

I just received all my M-Tech suspension bits ("short Red" springs, factory-revalved Bilsteins, etc.) but didn't order items # 11 and #12 for the rear shocks. Do I need these?

http://www.realoem.com/bmw/showparts.do ... g=33&fg=45
e24mpwr
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Post by e24mpwr »

e24mpwr wrote:Got my ring in the mail today - that thing is sturdier (and bigger) than I expected.
As a follow-up, the ring didn't fit the old shocks, but did fit the new ones. It is 1/2", and kind of a pain to use...
e24mpwr
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Post by e24mpwr »

LarryM wrote:I'm still a bit confused on the external bump stops and protective boots, and when they're needed. Someone previously said Bilsteins have internal bump stops, but it seems to me like something's missing.

I just received all my M-Tech suspension bits ("short Red" springs, factory-revalved Bilsteins, etc.) but didn't order items # 11 and #12 for the rear shocks. Do I need these?

http://www.realoem.com/bmw/showparts.do ... g=33&fg=45
I needed them in the back for my Bilstein Sport set in the rear only (11 & 12 in that diagram). The set that was already in my M635 were yellow and didn't have bump stops in the front and the new Sports in the front don't need them.
Chimi-Changa
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Post by Chimi-Changa »

Anyone know where I can source a gland nut tool? ( 08/6)

Checked with Bilstein and forum member listed above- no luck yet....
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