Click to go to Forum Home Click to go to maXbimmer Home

Go Back   maXbimmer Forums > General > General Discussion
User Name
Password


Welcome to Maxbimmer.com!

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

Reply
 
Thread Tools Rate Thread Display Modes
Old 01-06-2014, 05:41 PM   #1
mtnbiker
1st Gear Newbie
 
Join Date: May 2013
Location: tORONTO
Posts: 42
E46 rear end stability/rebound help

Hi guys,

Im trying to figure out why the rear end of my 01 330ci does not seem planted, I will try explain it as best as I can as I dont know the right terms.

Previously when I went over a bump at speed it felt like the rear end did not absorb much of the force and after the compression, it felt like it was all over the place. So I checked the rear shocks, and the rear right was blown. So I replaced both shocks.

This made the compression/absorption much better but it was still all over the place after the bump. I checked the RTAB as per the forums, and sure enough they were both in bad shape. After I replaced both of them it feels much much better, however I still feel like after a bump, the tire does not make contact back to the road quick enough or so. Almost feels like its skipping or just not pushing the tire back on to the road fast/hard enough.

I hope that makes sense. Could this be because of the rear springs? What are the symptoms of bad springs? IF not, what else could it be?
__________________
[SIGPIC]
mtnbiker is offline   Reply With Quote
Old 01-06-2014, 05:47 PM   #2
dbworld4k
Addict
 
dbworld4k's Avatar
 
Join Date: Aug 2006
Location: YYZ / ORD
Posts: 7,251
E46 rear end stability/rebound help

Did you do an alignment after the trailing arm bushings?
__________________


'02 ///M5 Imola Red / Imola Red '09 335i Alpine White / Coral Red

Past:
'04 E55 AMG Brilliant Silver / Anthracite
'96 318i Alpine White / Black
'01 330Ci Titanium Silver / Coral Red
'96 328i Jet Black / Black
dbworld4k is offline   Reply With Quote
Old 01-06-2014, 05:53 PM   #3
mtnbiker
1st Gear Newbie
 
Join Date: May 2013
Location: tORONTO
Posts: 42
Yes I did get an alignment, would an alignment make that much of a difference?
__________________
[SIGPIC]
mtnbiker is offline   Reply With Quote
Old 01-06-2014, 05:56 PM   #4
mtnbiker
1st Gear Newbie
 
Join Date: May 2013
Location: tORONTO
Posts: 42
And when I say it feels like it doesnt make contact with the road fast enough, its probably just milliseconds, but its noticeable.

From my understanding the shocks help with the upward travel of the tire and the springs help push them down after the shock compresses?
__________________
[SIGPIC]
mtnbiker is offline   Reply With Quote
Old 01-06-2014, 06:54 PM   #5
dbworld4k
Addict
 
dbworld4k's Avatar
 
Join Date: Aug 2006
Location: YYZ / ORD
Posts: 7,251
I experienced very similar issues once with my E46. Turned out to be blown RTABs, and that solved it. In your case, assuming the RTAB replacements were good quality and installed properly and the alignment was done properly, the next thing I would check are your tires. How old are they, and how's the tread? Have you had your rims balanced recently to check for bends/warping?

Worst case, bring it to a good independent shop (one of the sponsors on this forum) and have them take a look at it. I'd recommend Stance Factory as they're suspension specialists and should definitely help.
__________________


'02 ///M5 Imola Red / Imola Red '09 335i Alpine White / Coral Red

Past:
'04 E55 AMG Brilliant Silver / Anthracite
'96 318i Alpine White / Black
'01 330Ci Titanium Silver / Coral Red
'96 328i Jet Black / Black
dbworld4k is offline   Reply With Quote
Old 01-06-2014, 07:29 PM   #6
windwagen
6th Gear Member
 
windwagen's Avatar
 
Join Date: Jul 2004
Location: Markham
Posts: 1,897
What's the tire pressure?
windwagen is offline   Reply With Quote
Old 01-06-2014, 09:29 PM   #7
mtnbiker
1st Gear Newbie
 
Join Date: May 2013
Location: tORONTO
Posts: 42
Quote:
Originally Posted by windwagen View Post
What's the tire pressure?
On my summer tires (225/45/17 and 255/40/17) I run 36F and 40R. On the winter tires I have to check but I've experienced the same thing on both set of tires.
__________________
[SIGPIC]
mtnbiker is offline   Reply With Quote
Old 01-06-2014, 09:36 PM   #8
mtnbiker
1st Gear Newbie
 
Join Date: May 2013
Location: tORONTO
Posts: 42
Quote:
Originally Posted by dbworld4k View Post
I experienced very similar issues once with my E46. Turned out to be blown RTABs, and that solved it. In your case, assuming the RTAB replacements were good quality and installed properly and the alignment was done properly, the next thing I would check are your tires. How old are they, and how's the tread? Have you had your rims balanced recently to check for bends/warping?

Worst case, bring it to a good independent shop (one of the sponsors on this forum) and have them take a look at it. I'd recommend Stance Factory as they're suspension specialists and should definitely help.
I got OEM RTAB's and got it installed at a reputable mechanic, not a sponsor, but a good BMW mechanic. Maybe I should get the alignment checked again. Any recommendations for alignment shops?

My summer tires were new Hankook v12's bought last summer and balanced at Simplytire and the winters are Pirelli Sottozero's about 3 years old now. The rear end behaves the same with both tires so I was thinking it wasn't the tires?
__________________
[SIGPIC]
mtnbiker is offline   Reply With Quote
Old 01-06-2014, 10:59 PM   #9
dbworld4k
Addict
 
dbworld4k's Avatar
 
Join Date: Aug 2006
Location: YYZ / ORD
Posts: 7,251
E46 rear end stability/rebound help

I use Pan Auto in Markham for alignments. (905) 294-8838. Might even be worth mentioning the cause for your visit when you see him in person, perhaps he can take a peek while it's on the machine.

Tell him Anuk referred you.

It's a one man show, but the guy is meticulous and by far the best and most accurate alignment shop I've used, and I've been to several and most weren't good enough or charged obscure rates. I've had several cars done there and some with custom specs to my liking. Perfect job, every single time.
__________________


'02 ///M5 Imola Red / Imola Red '09 335i Alpine White / Coral Red

Past:
'04 E55 AMG Brilliant Silver / Anthracite
'96 318i Alpine White / Black
'01 330Ci Titanium Silver / Coral Red
'96 328i Jet Black / Black
dbworld4k is offline   Reply With Quote
Old 01-07-2014, 01:52 AM   #10
jabela
4th Gear Member
 
Join Date: Apr 2007
Location: Toronto, ON, Canada
Posts: 768
Are you shocks and springs OEM?
Your rear tire pressure is a little high. You could lower it to 33-35psi to see if that helps.

Have you checked to see if your subframe is torn? I've seen people complain of similar issues when theirs was torn.
__________________

2002 E46 325ci // 5spd // ISC N1 Coilovers
www.modernapothecary.ca
jabela is offline   Reply With Quote
Reply

Tags
e46, stability, suspension

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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 On

Forum Jump


All times are GMT -4. The time now is 09:49 AM.


Powered by vBulletin® Version 3.8.1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Maxbimmer Copyright 2001 - 2014