ZPOST
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   ZPOST > BMW Z4 Technical Talk > Suspension and Braking Chat
  TireRack

SUPPORT ZPOST BY DOING YOUR TIRERACK SHOPPING FROM THIS BANNER, THANKS!
Post Reply
 
Thread Tools Search this Thread
      04-03-2019, 09:28 PM   #1
Lure
New Member
0
Rep
21
Posts

Drives: Looking for
Join Date: Dec 2018
Location: Ohio

iTrader: (0)

Well my steering rack went out...major vibration in the wheels. I thought it was fcab or tie rods but nope! Anyone had one rebuilt by rackdoctors?
Appreciate 0
      04-04-2019, 02:06 AM   #2
Jsinghzzzz
Private First Class
Jsinghzzzz's Avatar
United_States
42
Rep
112
Posts

Drives: Black Z4M Coupe
Join Date: Oct 2017
Location: Bay Area, CA

iTrader: (0)

https://www.zpost.com/forums/showthread.php?t=1563265

RackDoctor recommendation per KevinC

Looks like it worked out well thus far for RDMZ4M
__________________
Stock Black on Black Coupe.
IG: @jsinghzzzz | @jsinghdreams
Appreciate 0
      04-04-2019, 02:55 PM   #3
Michael9218
Second Lieutenant
201
Rep
211
Posts

Drives: 2007 Z4 M Coupe
Join Date: Oct 2012
Location: Woodstock, GA

iTrader: (0)

Are you sure it's the rack and not the pump?
Is your rack leaking?
My experience has been when the wheel throbs its typically because the pump can't hold pressure. If it's the rack blowing a seal, you should see fluid leaking badly.

Rack Doctor just serviced my M Coupe rack. Great company.
Appreciate 0
      04-04-2019, 07:31 PM   #4
longress
Second Lieutenant
longress's Avatar
United_States
98
Rep
226
Posts

Drives: 2007 Z4M Coupe
Join Date: Oct 2015
Location: Wyoming

iTrader: (2)

Following.... I've never heard of a failed steering rack causing a vibration.
Appreciate 0
      04-07-2019, 06:56 AM   #5
Lure
New Member
0
Rep
21
Posts

Drives: Looking for
Join Date: Dec 2018
Location: Ohio

iTrader: (0)

Hmm could be the pump also...but the rack has definitely some excessive play in the driver side. Gonna send the rack out to rackdoctors anyway. I spoke to them on the phone and wow what a nice thing to speak to the actual owners on the phone!
Appreciate 0
      04-07-2019, 08:01 AM   #6
Michael9218
Second Lieutenant
201
Rep
211
Posts

Drives: 2007 Z4 M Coupe
Join Date: Oct 2012
Location: Woodstock, GA

iTrader: (0)

Quote:
Originally Posted by Lure View Post
Hmm could be the pump also...but the rack has definitely some excessive play in the driver side. Gonna send the rack out to rackdoctors anyway. I spoke to them on the phone and wow what a nice thing to speak to the actual owners on the phone!
Let us know what he finds. Excess play sounds like an inner or outer ball joint.
Can you feel play in the tie rod?

Rich is a great guy. Very helpful and happens to be a BMW enthusiast.
Appreciate 0
      04-13-2019, 08:29 AM   #7
Lure
New Member
0
Rep
21
Posts

Drives: Looking for
Join Date: Dec 2018
Location: Ohio

iTrader: (0)

[IMG][/IMG] dealing rackdoctor was a very nice experience! Very fast and helpful. I have to check a few things on install I was having pulse and shaking when the car was at a stop. So possible cavitation from cracked pump reservoir also.
Attached Images
 
Appreciate 0
      04-13-2019, 08:33 PM   #8
lapoune
New Member
8
Rep
25
Posts

Drives: m2c
Join Date: Mar 2015
Location: meh

iTrader: (0)

I'm curious, for one of you with a rack out of the car, can someone measure the movement of the rack per revolution, or lock-to-lock with the tie-rods on?

Recently bought a remanufactured rack from BMW, and I'm not sure I received the right part...
Appreciate 0
      04-14-2019, 01:23 PM   #9
Michael9218
Second Lieutenant
201
Rep
211
Posts

Drives: 2007 Z4 M Coupe
Join Date: Oct 2012
Location: Woodstock, GA

iTrader: (0)

Coupe and Roadster have different racks. Which one are wanting to compare to?
IIRC, Roadster is 3 turns lock to lock. Coupe is 2.7.
Appreciate 0
      04-15-2019, 03:26 PM   #10
lapoune
New Member
8
Rep
25
Posts

Drives: m2c
Join Date: Mar 2015
Location: meh

iTrader: (0)

I know, but I'm looking for a hands on confirmation of the differences between the 2 racks.

My BMW reman'd coupe rack for example measured at 50mm\rev and 2.7 turns lock to lock, which doesn't match what people report on the internet, it more closely matches the roadster rack reported numbers. I've seen reports of 54mm\rev (translates to about 2.5 turns lock to lock) for coupe racks, but I'm starting to doubt these numbers.

Lots of misinformation around these things so would be cool to clarify some of this while some people conveniently have their racks out!
Appreciate 0
Post Reply

Bookmarks

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 -5. The time now is 03:41 PM.




zpost
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, 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