Home Forums Articles How To's FAQ Register
Go Back   Xoutpost.com > BMW SAV Forums > X5 (E53) Forum
Fluid Motor Union
User Name
Password
Member List Premier Membership Search Today's Posts Mark Forums Read

Xoutpost server transfer and maintenance is occurring....
Xoutpost is currently undergoing a planned server migration.... stay tuned for new developments.... sincerely, the management


Reply
 
LinkBack Thread Tools Display Modes
  #61  
Old 01-18-2021, 05:04 PM
Member
 
Join Date: Jul 2016
Location: Menlo Park, CA
Posts: 1,640
Fifty150hs is on a distinguished road
Quote:
Originally Posted by Overboost View Post
You could barely feel the slightest notch when rotating the u-joint by hand. I would never have thought that little tiny notch would cause so much vibration on my E46 but it was. I tried the CSB first but no love, it was better but still there. Replaced the driveshaft and all was well again. Definitely horrible under load but still vibrated over 70MPH on the freeway.
I'll have to look at it again, but I didn't feel any resistance in any movement of the u joint when I was checking it. What do you mean by "notch"?
Reply With Quote

Sponsored Links

  #62  
Old 01-18-2021, 05:28 PM
andrewwynn's Avatar
Member
 
Join Date: Jun 2015
Location: Racine, WI
Posts: 7,257
andrewwynn is on a distinguished road
70 is about 103 ft/sec out tires are 5.7' circumference so 103/5.7=18.07 Hz at 70. 18*4.1=73.8 Hz aka 73.8*60=4428 RPM. That's definitely fast enough to be a problem with a small weight off balance.

I'm a little concerned about the possibility of under load causing an issue but that would be very similar to my theory of my under braking causing vibration.

Do you get UFO noises when backing up?
__________________
E53 / M54 2001 3.0i gas LHD (pair of them: his & her)
Reply With Quote
  #63  
Old 01-18-2021, 05:43 PM
Member
 
Join Date: Jul 2016
Location: Menlo Park, CA
Posts: 1,640
Fifty150hs is on a distinguished road
Quote:
Originally Posted by andrewwynn View Post
70 is about 103 ft/sec out tires are 5.7' circumference so 103/5.7=18.07 Hz at 70. 18*4.1=73.8 Hz aka 73.8*60=4428 RPM. That's definitely fast enough to be a problem with a small weight off balance.

I'm a little concerned about the possibility of under load causing an issue but that would be very similar to my theory of my under braking causing vibration.

Do you get UFO noises when backing up?
No UFO noises. That's why I didn't think it would be a wheel bearing. All the reading I've done on it the common denominator with a wheel bearing is the UFO noise. I'm not getting a crunchy noises from my CV joints either so
Reply With Quote
  #64  
Old 01-18-2021, 05:44 PM
andrewwynn's Avatar
Member
 
Join Date: Jun 2015
Location: Racine, WI
Posts: 7,257
andrewwynn is on a distinguished road
Driveshaft shake should be about 74hz on the vibration app but I don't know if it goes that high.

Use this app or similar to get an audio reading:.

https://apps.apple.com/us/app/fft/id298840058
__________________
E53 / M54 2001 3.0i gas LHD (pair of them: his & her)
Reply With Quote
  #65  
Old 01-18-2021, 05:51 PM
Overboost's Avatar
//Binary is in my DNA
 
Join Date: Apr 2006
Location: Huntersville, NC
Posts: 3,005
Overboost is on a distinguished road
Quote:
Originally Posted by Fifty150hs View Post
I'll have to look at it again, but I didn't feel any resistance in any movement of the u joint when I was checking it. What do you mean by "notch"?
As you have it disconnected, move the u-joint through is movement. There was the slightest notch when it got to one point. I MEAN SLIGHT! You could barely feel it but you will notice it.
Reply With Quote
  #66  
Old 01-18-2021, 05:56 PM
Member
 
Join Date: Jul 2016
Location: Menlo Park, CA
Posts: 1,640
Fifty150hs is on a distinguished road
Quote:
Originally Posted by andrewwynn View Post
Driveshaft shake should be about 74hz on the vibration app but I don't know if it goes that high.

Use this app or similar to get an audio reading:.

https://apps.apple.com/us/app/fft/id298840058
Ya, only goes to 50hz.

I'll try this other. Thanks!
Reply With Quote
  #67  
Old 01-18-2021, 05:57 PM
Member
 
Join Date: Jul 2016
Location: Menlo Park, CA
Posts: 1,640
Fifty150hs is on a distinguished road
Quote:
Originally Posted by Overboost View Post
As you have it disconnected, move the u-joint through is movement. There was the slightest notch when it got to one point. I MEAN SLIGHT! You could barely feel it but you will notice it.
I had it apart when I replaced the CSB. I moved it though all motions, full range. It felt smooth.
Reply With Quote
  #68  
Old 01-18-2021, 05:59 PM
andrewwynn's Avatar
Member
 
Join Date: Jun 2015
Location: Racine, WI
Posts: 7,257
andrewwynn is on a distinguished road
UFO sound comes from differential. Mostly noticable in reverse.

My bearing was silent for years but the suspect in my wobble/shimmy. I will know soon just swapped alternator and ready to test drive.
__________________
E53 / M54 2001 3.0i gas LHD (pair of them: his & her)
Reply With Quote
  #69  
Old 01-18-2021, 07:05 PM
Member
 
Join Date: Jul 2016
Location: Menlo Park, CA
Posts: 1,640
Fifty150hs is on a distinguished road
Quote:
Originally Posted by andrewwynn View Post
UFO sound comes from differential. Mostly noticable in reverse.

My bearing was silent for years but the suspect in my wobble/shimmy. I will know soon just swapped alternator and ready to test drive.
That's good to know. Definitely no UFO noises.
Reply With Quote
  #70  
Old 01-18-2021, 11:14 PM
andrewwynn's Avatar
Member
 
Join Date: Jun 2015
Location: Racine, WI
Posts: 7,257
andrewwynn is on a distinguished road


Here is an example from the FFT program. You can drag out a cursor to figure out exactly where the Spike is. You can also change the ex and Y axis so you can zoom in on a particular frequency range.
__________________
E53 / M54 2001 3.0i gas LHD (pair of them: his & her)
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

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
Trackbacks are On
Pingbacks are On
Refbacks are On





All times are GMT -4. The time now is 11:37 PM.
vBulletin, Copyright 2021, Jelsoft Enterprises Ltd. SEO by vBSEO 3.6.0
2017 Xoutpost.com. All rights reserved. Xoutpost.com is a private enthusiast site not associated with BMW AG.
The BMW name, marks, M stripe logo, and Roundel logo as well as X3, X5 and X6 designations used in the pages of this Web Site are the property of BMW AG.
This web site is not sponsored or affiliated in any way with BMW AG or any of its subsidiaries.