E46 BMW Social Directory E46 FAQ 3-Series Discussion Forums BMW Photo Gallery BMW 3-Series Technical Information E46 Fanatics - The Ultimate BMW Resource BMW Vendors General E46 Forum The Tire Rack's Tire Wheel Forum Forced Induction Forum The Off-Topic The E46 BMW Showroom For Sale, For Trade or Wanting to Buy

Welcome to the E46Fanatics forums. E46Fanatics is the premiere website for BMW 3 series owners around the world with interactive forums, a geographical enthusiast directory, photo galleries, and technical information for BMW enthusiasts.

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!

If you have any problems with the registration process or your account login, please contact contact us.

Go Back   E46Fanatics > E46 BMW > E46 Xi Forum

E46 Xi Forum
The E46 XI was produced from 01-05 in sedan and touring body styles. Powered by either a 2.5L inline 6 in the 325xi or a 3.0L inline 6 330xi. Discuss all thing about BMW AWD E46 'Xi' here.

Thread Tools Search this Thread Rate Thread Display Modes
Old 10-26-2010, 10:48 AM   #1
Mark M
Registered User
Join Date: Sep 2009
Location: Lancaster, PA
Posts: 422
My Ride: e30 M3 / e90 335d
Any XIs with subframe cracks ???

Over on M3Forums there are a handful of members dealing with cracked rear subframes. I know they cite the primary causes for rear subframe cracking is abrupt application of power / torque to the rear wheels, like launching the car, and/or worn RTABs.

Wondering if us XI boys have seen any issues? Had the dealer check mine last year and was given a thumbs up, no issues.

Anyone else?
Mark M is offline   Reply With Quote
Ads by Google

Guests, get your FREE E46Fanatics.com membership to remove this ad.
Old 10-26-2010, 10:57 AM   #2
Registered User
Join Date: Sep 2010
Location: CO
Posts: 1,039
My Ride: e46xi, e46m
Xi's don't have subframe issues. Only crappy RWD cars have that problem.
TiAgXi is offline   Reply With Quote
Old 10-26-2010, 02:32 PM   #3
Mark M
Registered User
Join Date: Sep 2009
Location: Lancaster, PA
Posts: 422
My Ride: e30 M3 / e90 335d
TiAg might not be too far from the truth here. My gut theory is that due to the AWD system, the rear subframe never sees enough torque to cause cracks.

However, conversely, due to the AWD system, our front control arm bushings wear faster due to the torque / power now pulling through the front axles.
Mark M is offline   Reply With Quote
Old 10-26-2010, 04:01 PM   #4
Registered User
Join Date: Apr 2008
Location: Boston
Posts: 4,971
My Ride: 2003 325xi

The cause of subframe damage is poor welds that don't hold. Xi's dont have the bad welds, so no subframe issues.

Poor welds are poor welds. It doesn't matter how much/little power the rear wheels get- if the welds are bad, the welds are bad. You either have a cracked subframe, likely to get one in the future, or will most likely never get a cracked subframe.

Luckily all xi's fall into the third category, as do most e46's. It's the welder that determines if your car has potential subframe damage. E46's without poor welds won't have subframe issues. E46's with poor welds either have a cracked subframe, or the possibility of one in the future. Adding more power to a car with good welds isn't going to cause subframe damage. On the other hand, adding more power to a car with bad welds most likely increases the chances your subframe will crack.

Make sense?
Kubica is offline   Reply With Quote
Old 10-26-2010, 04:59 PM   #5
Registered User
Join Date: Nov 2006
Location: Edmonton, Canada
Posts: 2,230
My Ride: 2003 325xi
The main difference is that there is a transfer case right in the middle of the car between the 2 drive lines. This stiffness between the front and rear differentials prevents the subframe movements in the RWD that cause the failures. Take a look under your xi and you'll see the strength from building the drivetrain this way.
xi_ter is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
Censor is ON

All times are GMT -5. The time now is 05:01 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
(c) 1999 - 2016 performanceIX Inc - privacy policy - terms of use