E90Post
 


Extreme Powerhouse
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > Sway Bars and End Link Lengths



Reply
 
Thread Tools Search this Thread
      09-06-2015, 12:19 AM   #1
sle39lvr
Captain
130
Rep
657
Posts

Drives: 08 328i
Join Date: Aug 2011
Location: United States

iTrader: (3)

Sway Bars and End Link Lengths



I've read over and over how sway bars should mount to the subframe and mount to suspension in the SAME HORIZONTAL PLANE. Is this true with our cars?

I have a non-sport E90, which I put FK Coilovers and their front end links started knocking from day 1. I just got HPA adjustable links (which were about 1" longer than FK ones at their shortest) and the difference is amazing. Front suspension now feels tighter and crisper. On highway, the front end seems less bouncy. This is with the stock front sway bar the came with. STILL....end mount of the sway bar is not horizontal with the body mount. Links should extend about 2 more inches; however, I am worried about the end hitting the front arms.

Now I am looking at the rear. I have a M3 sway in the back, yet stock sway bar end links it the car came with. Realoem lists all E9X's having the same rear sway bar links weather its a non sport or a sport or even an M3. STILL....in the back, end mount of the sway bar is not still horizontal with the body mount. Should they be? In order to gain proper performance out of sway bars?

Our suspension guru's would give me some input I hope
Appreciate 0
      09-06-2015, 11:10 AM   #2
feuer
Major General
feuer's Avatar
United_States
4289
Rep
9,226
Posts

Drives: wife crazy!
Join Date: Apr 2015
Location: Chicago, IL

iTrader: (5)

On significantly lowered e9x the front sway bar links need to be longer and shorter in the back.
Appreciate 1
      09-07-2015, 02:45 PM   #3
sle39lvr
Captain
130
Rep
657
Posts

Drives: 08 328i
Join Date: Aug 2011
Location: United States

iTrader: (3)

Quote:
Originally Posted by feuer View Post
On significantly lowered e9x the front sway bar links need to be longer and shorter in the back.
Hmmm...anyone makes shorter ones for the back?
Appreciate 0
      09-07-2015, 03:16 PM   #4
feuer
Major General
feuer's Avatar
United_States
4289
Rep
9,226
Posts

Drives: wife crazy!
Join Date: Apr 2015
Location: Chicago, IL

iTrader: (5)

Quote:
Originally Posted by sle39lvr View Post
Hmmm...anyone makes shorter ones for the back?
No one, however you can get adjudtable links and set them to desired lenght.
Appreciate 0
      09-07-2015, 03:17 PM   #5
sle39lvr
Captain
130
Rep
657
Posts

Drives: 08 328i
Join Date: Aug 2011
Location: United States

iTrader: (3)

Quote:
Originally Posted by feuer View Post
No one, however you can get adjudtable links and set them to desired lenght.
I was hoping some other OEM part from like E46 or F30 may fit..I guess nvm.

So far I found:

HOTCHKIS
https://www.horsepowerfreaks.com/hot...ftsjmd7rvkvt77
Appreciate 0
      09-07-2015, 03:21 PM   #6
justpete
Brigadier General
United_States
1241
Rep
3,778
Posts

Drives: '11 328i '19 M6
Join Date: Jan 2012
Location: DFW

iTrader: (0)

Garage List
2019 BMW M6  [10.00]
2011 BMW 328i  [9.00]
AKG Motorsports #STBR9X

http://www.akgmotorsport.com/catalog...ion%2FBushings

Another option anyway...
__________________
2011 E90 328i 6MT, BMW Aero, CF hood/boot, PI+CAI+RM+3IM+BPC, SS+CI528+ThermoTec+SS#1+2XBurns, AKG 75D eng/trans, Al/Delrin diff/RS, CM 850, UCP, CAE, AKG DSSR, DiffsOnline 3.91 30/90 LSD+BW cooler, C&R, Setrab, Accusump, AST 3-way+Swift, Aurora PR+BW spherical, Vorshlag CPs, M3 brace+UR bar, ARC-8 18x8.5, 255 R1R, RB/CSL rotors+cooling, 135i calipers, RS29, RT700, Safecraft, OMP HTE-R+804F+QD Superquadro, 6pt cage+FIA, Braille, RT DL1Mk3
Appreciate 0
      09-07-2015, 03:24 PM   #7
sle39lvr
Captain
130
Rep
657
Posts

Drives: 08 328i
Join Date: Aug 2011
Location: United States

iTrader: (3)

Quote:
Originally Posted by justpete View Post
AKG Motorsports #STBR9X

http://www.akgmotorsport.com/catalog...ion%2FBushings

Another option anyway...

Perfect. Thank you. These look a little cheaper.

I am only about 10mm below M-sport height. I was amazed how the longer front bars fixed the ride. That pogo stick effect on highway. I am hoping rears would do the same....even though I don't have any knocking or play in the rear right now....just a harsher ride.
Appreciate 0
      09-07-2015, 03:33 PM   #8
justpete
Brigadier General
United_States
1241
Rep
3,778
Posts

Drives: '11 328i '19 M6
Join Date: Jan 2012
Location: DFW

iTrader: (0)

Garage List
2019 BMW M6  [10.00]
2011 BMW 328i  [9.00]
Quote:
Originally Posted by sle39lvr View Post
Perfect. Thank you. These look a little cheaper.

I am only about 10mm below M-sport height. I was amazed how the longer front bars fixed the ride. That pogo stick effect on highway. I am hoping rears would do the same....even though I don't have any knocking or play in the rear right now....just a harsher ride.
Running them myself with Turner adj endlinks up front. Ride height is 559mm, give or take, with 18" wheels, and ground clearance is about three inches if that helps at all.
__________________
2011 E90 328i 6MT, BMW Aero, CF hood/boot, PI+CAI+RM+3IM+BPC, SS+CI528+ThermoTec+SS#1+2XBurns, AKG 75D eng/trans, Al/Delrin diff/RS, CM 850, UCP, CAE, AKG DSSR, DiffsOnline 3.91 30/90 LSD+BW cooler, C&R, Setrab, Accusump, AST 3-way+Swift, Aurora PR+BW spherical, Vorshlag CPs, M3 brace+UR bar, ARC-8 18x8.5, 255 R1R, RB/CSL rotors+cooling, 135i calipers, RS29, RT700, Safecraft, OMP HTE-R+804F+QD Superquadro, 6pt cage+FIA, Braille, RT DL1Mk3
Appreciate 0
      09-07-2015, 04:46 PM   #9
sle39lvr
Captain
130
Rep
657
Posts

Drives: 08 328i
Join Date: Aug 2011
Location: United States

iTrader: (3)

Quote:
Originally Posted by justpete View Post
Running them myself with Turner adj endlinks up front. Ride height is 559mm, give or take, with 18" wheels, and ground clearance is about three inches if that helps at all.
How long did u make them? (I believe you are talking about rear ones? )
Appreciate 1
Donethat372.00
      09-07-2015, 04:53 PM   #10
justpete
Brigadier General
United_States
1241
Rep
3,778
Posts

Drives: '11 328i '19 M6
Join Date: Jan 2012
Location: DFW

iTrader: (0)

Garage List
2019 BMW M6  [10.00]
2011 BMW 328i  [9.00]
Quote:
Originally Posted by sle39lvr View Post
How long did u make them? (I believe you are talking about rear ones? )
Sorry, don't remember and the car is at the shop or I'd check. And yes, AKG rear endlinks are on the car.
__________________
2011 E90 328i 6MT, BMW Aero, CF hood/boot, PI+CAI+RM+3IM+BPC, SS+CI528+ThermoTec+SS#1+2XBurns, AKG 75D eng/trans, Al/Delrin diff/RS, CM 850, UCP, CAE, AKG DSSR, DiffsOnline 3.91 30/90 LSD+BW cooler, C&R, Setrab, Accusump, AST 3-way+Swift, Aurora PR+BW spherical, Vorshlag CPs, M3 brace+UR bar, ARC-8 18x8.5, 255 R1R, RB/CSL rotors+cooling, 135i calipers, RS29, RT700, Safecraft, OMP HTE-R+804F+QD Superquadro, 6pt cage+FIA, Braille, RT DL1Mk3
Appreciate 0
      09-07-2015, 05:42 PM   #11
nikitino25
Captain
nikitino25's Avatar
United_States
91
Rep
817
Posts

Drives: '07 E92 335i
Join Date: Dec 2011
Location: Missouri

iTrader: (2)

I'm getting ready to install some KW clubsports and plan on lowering the front about an inch and the rear maybe a half inch (from stock sport height) and will be using the stock sway bars (the front is actually from the BMW PS kit). Are you guys saying I'm going to need adjustable end links for the front and rear? Can I get by with just the fronts since I'm not lowering the rear so much? I currently have Ohlins coils with this same ride height already and I just used the stock end links, did I do it wrong? I haven't noticed any ill effects? Also, since most coilovers are designed to lower the car somewhat, wouldn't they take into consideration the sway bar end link mounting point and adjust it accordingly on the front struts (I can't remember where the rears connect)?

Last edited by nikitino25; 09-07-2015 at 06:16 PM..
Appreciate 0
      09-07-2015, 10:54 PM   #12
feuer
Major General
feuer's Avatar
United_States
4289
Rep
9,226
Posts

Drives: wife crazy!
Join Date: Apr 2015
Location: Chicago, IL

iTrader: (5)

Quote:
Originally Posted by nikitino25 View Post
Also, since most coilovers are designed to lower the car somewhat, wouldn't they take into consideration the sway bar end link mounting point and adjust it accordingly on the front struts (I can't remember where the rears connect)?
Well, they didn't and they don't hence the existence of adjustable links. With coilovers, especially if you want to corner weight your car adjustable links are a must.
Appreciate 0
      09-07-2015, 10:57 PM   #13
feuer
Major General
feuer's Avatar
United_States
4289
Rep
9,226
Posts

Drives: wife crazy!
Join Date: Apr 2015
Location: Chicago, IL

iTrader: (5)

Quote:
Originally Posted by sle39lvr View Post
How long did u make them? (I believe you are talking about rear ones? )
that is easy, you lower 10mm, you make the front longer 10mm and rear shorter 10mm, or at least close to that.
Appreciate 0
      09-08-2015, 12:31 AM   #14
sle39lvr
Captain
130
Rep
657
Posts

Drives: 08 328i
Join Date: Aug 2011
Location: United States

iTrader: (3)

Quote:
Originally Posted by feuer View Post
that is easy, you lower 10mm, you make the front longer 10mm and rear shorter 10mm, or at least close to that.
Makes sense
Appreciate 0
      09-13-2015, 03:22 AM   #15
nikitino25
Captain
nikitino25's Avatar
United_States
91
Rep
817
Posts

Drives: '07 E92 335i
Join Date: Dec 2011
Location: Missouri

iTrader: (2)

Whats's the proper way to adjust the front end links? My car is on jack two jack stands with the front in the air, can I jack up both hubs to ride height (measured from fender) or must the car be on the ground with full weight on it? How do I know when the sway bar is oriented correctly with no preload to line up the end links? My bar (bmw ps front bar) has all kinds of twists and turns and I don't know how to angle it....using hotchkis adjustable end links...my bar is shaped totally different than the pic in OP's first post...
Appreciate 0
      09-13-2015, 11:24 AM   #16
feuer
Major General
feuer's Avatar
United_States
4289
Rep
9,226
Posts

Drives: wife crazy!
Join Date: Apr 2015
Location: Chicago, IL

iTrader: (5)

Quote:
Originally Posted by nikitino25 View Post
Whats's the proper way to adjust the front end links?
You can do it with the car on jack stands or on the floor, is really up to you. If on jack stands you will have to raise at least one hub up to riding height. You only need to measure one side actually. Then just copy the length of the link on the opposite side. Place the sway bar in natural position (the way it sits from factory) raise the hub to riding height, and adjust the length of the link so the ball rod will go into the mounting tubs of the sway bar and the strut with little resistance. Duplicate the length on the link for the other side and you are all set.
Appreciate 0
      09-13-2015, 12:21 PM   #17
sle39lvr
Captain
130
Rep
657
Posts

Drives: 08 328i
Join Date: Aug 2011
Location: United States

iTrader: (3)

I am waiting my rear adjustable end links to come in. Planning of doing a comprehensive post about my findings after that. If the rear changes the way the front did with proper links, I think all of us who lowered out e9X's should look in to this....
Appreciate 0
      09-13-2015, 04:27 PM   #18
chris82
Brigadier General
chris82's Avatar
United_States
839
Rep
3,855
Posts

Drives: 128i
Join Date: Aug 2012
Location: NY NY

iTrader: (8)

Garage List
2009 BMW 128i  [9.80]
Just another option are the Ground Control adjustable rear end links. They are a very high quality piece.
Appreciate 0
      05-06-2016, 09:48 AM   #19
Tim603
Colonel
Tim603's Avatar
United_States
488
Rep
2,283
Posts

Drives: 2007 335i E90
Join Date: Feb 2012
Location: North Canton, OH

iTrader: (8)

Garage List
2007 335i  [0.00]
Looks like I will be needing some shorter links. I think im going to get them from turner
__________________
Appreciate 0
      05-06-2016, 09:49 AM   #20
Tim603
Colonel
Tim603's Avatar
United_States
488
Rep
2,283
Posts

Drives: 2007 335i E90
Join Date: Feb 2012
Location: North Canton, OH

iTrader: (8)

Garage List
2007 335i  [0.00]
One thread left on Bilstein b14 coils. End links are def maxed out and I'm experiencing same symptoms over bumps
Attached Images
   
__________________
Appreciate 0
      05-16-2016, 09:40 PM   #21
Tim603
Colonel
Tim603's Avatar
United_States
488
Rep
2,283
Posts

Drives: 2007 335i E90
Join Date: Feb 2012
Location: North Canton, OH

iTrader: (8)

Garage List
2007 335i  [0.00]
WOW. Just installed LONGER front end links (yes the lower you are the longer they need to be) and what a difference. Night and day. My front sway bar is an m3 H&R one so my problems were a little worse due to it being so freaking thick but longer links fixed the issue entirely. No noises, no extra stiffness, not super bouncy anymore, perfect.

If anyone is wondering I got the turner 12.99"-13.58" length (stock is 11.5"). I had to preload my suspension to measure so it was the perfect length when car is just sitting as normal. Because they are now longer I had to preload each side a little bit to get the end links in place, but that wasn't too hard.
Attached Images
   
__________________
Appreciate 3
Reply

Bookmarks

Tags
e90, suspension, sway bar links


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 05:27 PM.




e90post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST