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 > Tuning & Tech > Suspension & Braking Forum by BimmerWorld

Suspension & Braking Forum by BimmerWorld
Have some questions about suspension or brake setups for your E46 BMW? Get all your answers here!
Sponsored by BimmerWorld

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 11-22-2014, 11:02 PM   #1
C_west_e46
Registered User
 
Join Date: Oct 2014
Location: Olympia
Posts: 7
My Ride: 2001 330ci
Back right wheel keeps seizing up! Help!

Hi everyone,

I recently purchased a 2001 330ci from someone who i can only describe as a "corner-cutter". it has a welded rear diff(idk if thats part of it or helps). When I bought it, the thing was maxed out to the ground for the front coilovers AND rear lowering springs...I mean maxed out. I first heard the "skid/stutter" sound and thought easy fix, I'll raise it, which is what i was gonna do anyway. Raised it and bought new brake pads, No Dice. Still does the same stuff.
when I turn off the DSC, it doesnt do #2. but problem #1 is constant


Problem #1 - When im stopped and I begin to accelerate while turning, my back right rear tire skids in quick little jerks. I thought it was both tires but it only seems to be the one. I can drive through it no problem as far as resistance goes, its not locking the whole car down but its definitely not a good thing so i haven't been driving it-(No dash lights blink or are on)

Problem #2 - When i take a sharper turn while moving, my DSC light blinks and the car goes limp. It doesnt die and everything stays on (radio,lights) but it loses all power throttle-wise. Once I straighten out enough I get power in my pedal back instantly and everything works fine.

Ive recenently had suspension work but it was done professionaly and the problem was occuring
C_west_e46 is offline   Reply With Quote
Ads by Google

Guests, get your FREE E46Fanatics.com membership to remove this ad.
Old 11-22-2014, 11:31 PM   #2
mbogosia
Registered User
 
Join Date: May 2004
Location: Nashville
Posts: 125
My Ride: 2001 330i
I think that welded rear diff is causing this. If I was you I would get a new rear diff.
mbogosia is offline   Reply With Quote
Old 11-22-2014, 11:43 PM   #3
jdstrickland
Registered User
 
Join Date: Apr 2010
Location: Murrieta, CA
Posts: 9,223
My Ride: '94 325iC & '00 323i
Quote:
Originally Posted by mbogosia View Post
I think that welded rear diff is causing this. If I was you I would get a new rear diff.
+10000000 on the diff causing this.

The tires have different arcs -- distances to travel -- when making a turn, so something has to slip on the pavement, this should be the inside tire because the weight transfer is to the outside. But the tires will ultimately decide which one will slip.

The diff is wreaking havoc on the DSC. The skidding tire is going too fast compared to the front tires, that also have different arcs -- distances to travel -- and the chaos this creates makes the DSC kick in to apply the brakes to the offending tire, and the throttle to drop out in an effort to regain control of the spinning tire.

You bought a car built by Dr. Frankenstein, it will be work for you to stay on top of. You bought a car that has been modified for a purpose, the result is that it has behaviors that you detect as symptoms of failure, but they are affects of the work done by the good Dr. Frank. Your monster needs a wife. Or a mechanic that knows how to keep this stuff running.
jdstrickland is offline   Reply With Quote
Old 11-22-2014, 11:46 PM   #4
jdstrickland
Registered User
 
Join Date: Apr 2010
Location: Murrieta, CA
Posts: 9,223
My Ride: '94 325iC & '00 323i
This guy also has a welded diff, and he has a snapped axle shaft as a result.

http://forum.e46fanatics.com/showthread.php?t=1059001
jdstrickland is offline   Reply With Quote
Old 11-23-2014, 08:39 AM   #5
LeMansteve
Registered User
 
Join Date: Nov 2008
Location: USA - GA
Posts: 2,309
My Ride: '04 330i 6mt ZSP ZPP
+1 to what jd said.

To clarify, a welded diff will force both tires to rotate at the same speed under all conditions. This is desirable when drifting but very impractical for everyday driving. The wheel skip you're experiencing when turning is from the inside wheel wanting to turn at the same speed as the outside wheel.

DSC is not designed to work properly with a welded diff. You're burning up the brakes and DSC unit because every time you turn, DSC senses the inside wheel is turning faster than it should be. DSC wants to brake the inside wheel but due to the welded diff it's basically impossible to do that independently of the outside wheel.
__________________
BMW CCA member - Peachtree Chapter
LeMansteve is offline   Reply With Quote
Old 11-23-2014, 09:24 AM   #6
lszlszx
Registered User
 
Join Date: Jan 2013
Location: Socal
Posts: 5,345
My Ride: 1.8T, XC70
Which is why it's called a "differential".
The driven wheels are supposed to be able to spin at different speed while turning.
This is a perfect time for you to swap in a shorter ratio unit, if you want a bit more acceleration.
__________________


GM No Reverse - posts 427, 439

"Would the codes indicate if it's the carburator?"
lszlszx is offline   Reply With Quote
Old 11-23-2014, 03:32 PM   #7
jdstrickland
Registered User
 
Join Date: Apr 2010
Location: Murrieta, CA
Posts: 9,223
My Ride: '94 325iC & '00 323i
Let's explain this another way...

For the sake of discussion, your tires are 25" in diameter. Multiplying by pi (3.1419), the circumference is 78.5". Now, let's say you are making a right turn next to the curb. The left side tire has to travel 15 ft to make the turn, the right side tire only needs to travel 6 ft. I have not worked out the radius, but let's assume these numbers to be accurate for the sake of illustrating the problem of a welded diff -- also called a spool in some circles.

The tire that goes 15 ft, goes 180 inches, the one that goes 6 ft goes 72 inches.

The outside tire rotates 180 / 78.5 = 2.29 times, the inside tire only needs to rotate 0.91 times (72 / 78.5 = 0.91), but the spool forces it to go the same as the other tire. The inside tire is forced to rotate almost 1.5 times more than the distance it needs to travel -- it has to slip on the pavement or snap the axle shaft for this to work.
jdstrickland is offline   Reply With Quote
Old 11-23-2014, 05:53 PM   #8
C_west_e46
Registered User
 
Join Date: Oct 2014
Location: Olympia
Posts: 7
My Ride: 2001 330ci
ok cool thank you so much guys. that just saved me a lot of money. i understand the problem now. how do i go about fixing this problem? im sort of new to cars so any suggestions or advice would be apprecieated
C_west_e46 is offline   Reply With Quote
Old 11-23-2014, 06:04 PM   #9
jfoj
OEM ///Member
 
Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 22,856
My Ride: 330CiC, M5, X5, E93
Replace the differential.

Used unit or look at this site if you have money to waste - http://diffsonline.com/
__________________
Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
jfoj is offline   Reply With Quote
Reply

Tags
abs, dsc, welded rear diff, wheel

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 03:58 PM.


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