BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)


Post Reply
Thread Tools Search this Thread
      04-23-2014, 01:50 AM   #1
Private First Class

Drives: 2008 135i convertible
Join Date: Aug 2010
Location: CA

iTrader: (0)

H&R Performance sway bars

Just got an email from ECS Tuning about those:

Apparently the same bars work on the vert as well. This is surprising to me, I had always seen bars for coupe only.

I've got two questions:
1. How hard would it be to install them on a vert? Is it a DIY job?
2. Which one is the better buy, just the front or both?
Appreciate 0
      04-23-2014, 11:18 AM   #2
brusk's Avatar

Drives: 2008 135i Coupe
Join Date: Jan 2012
Location: Cleveland, TN

iTrader: (1)

I'm curious on that. If you start with a car that already has a tendancy to understeer wouldn't adding a stiffer front sway bar make it even worse? I would think you'd get better results from wider front rubber and M3 control arms.
2008 135i - MHD/JB4, MS DP's, AMS IC, UI CAI, CDV delete, M3 control arms/Links, RE Toe Link, ECS Trailing Arm, M3 rear SF & Trans bushings, SS brake lines, Michelin PSS.
Appreciate 0
      04-23-2014, 01:22 PM   #3

Drives: 2010 128 Covertible
Join Date: Jan 2014
Location: Mountains

iTrader: (0)


Originally Posted by brusk View Post
If you start with a car that already has a tendancy to understeer wouldn't adding a stiffer front sway bar make it even worse?
On a race car with double a-arm suspension front and rear, it would. On a car with MacPherson struts up front, not so much.

The sway bar transfers weight to the outside front wheel. Which increases understeer. But it also greatly improves wheel camber under hard cornering. Which decreases understeer. Which wins? Who knows? It depends on a lot of things. But reports here on just making the front bar bigger at least indicates increased understeer is not a problem if you change only the front.

Sway bars are extremely tricky. The front and the rear do very different things, especially on a car with MacPherson struts on the front. The front bar and the springs provide the vast majority of the roll control. The rear bar is largely for tuning the handling balance. It generally provides about 5% of the amount of roll control as the front, and only a couple of percent of the total roll control.

People (not just BMW guys) muck about with sway bars a lot without understanding exactly what they do and how they do it. Not the best idea. That also means any advice you get here may be questionable. Including my post. <grin>

Last edited by 128Convertibleguy; 04-23-2014 at 02:02 PM.
Appreciate 0
      04-23-2014, 01:36 PM   #4
3002 tii
Lieutenant General
3002 tii's Avatar

Drives: E86, E90, F25
Join Date: Apr 2008
Location: CT

iTrader: (84)

Garage List
There's a difference as to what feels better and what's faster. And yes, the MacPherson suspension has a weird camber curve which is why our cars respond better to thicker front sways. With that said, I've yet to drive my 1-er on track but I did change to the E93 M3 fsb and the car exhibited noticeably less roll. Great for daily driving, can't tell you though how it is on track.
Active Autowerke | Supersprint | TC Kline | Ground Control | MFactory | Volks | Nitto

Appreciate 0
Post Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 -4. The time now is 10:57 AM.

Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.,,,,,,,,, logo and trademark are properties of BIMMERPOST