Notices
 

  

User Tag List

Thread: Crown differential test

Results 1 to 7 of 7
  1. Crown differential test 
    #1
    Join Date
    Dec 2007
    Location
    Nr Newport S Wales
    Posts
    37
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    5 Post(s)
    Hi Folks. I've been running an A6 BiTdi for nearly three years and 25K miles and it's been perfect in every way. Having just retired a Passat 4Motion that we did 224K miles in (actually gave it to my daughter) we replaced it with an A7 3l TDI Quattro. Also an awesome car but you do notice the 50 horses missing sometimes...

    The A6 has a ZF 8 speed and the A7 a 7 speed DSG box, but both cars use Audi's crown centre differential - first seen on the RS5 in 2010. We've only had the 7 for 2 weeks but right from the start I felt that on slow tight turns the tyres seem to grind much like an off road 4x4 with the centre diff locked driving on tarmac. I've got warranty left on the 7 but before I start moaning at Audi, is there a test I can do to prove the centre diff is operating properly? I have a 1989 SIerra 4x4 and on that its a case of lifting one front wheel and put a torque wrench on the hub nut and seeing how much torque it takes to turn it at 1 rpm. Pretty easy. I'll guess that to test the audi will be harder as it has a much wider torque bias. A good start will be to prove it isn't seized solid though.


    The only other difference between the two cars is the 7 has 275/30/21 Dunlops where the 6 has 255/35/20 Pirelli tyres.

    Any thoughts from anyone?


    Cheers

    Dave
     
    0 0 0
     

  2. Re: Crown differential test 
    #2
    Join Date
    Jan 2007
    Location
    Nottingham, England
    Posts
    36,509
    Post Thanks / Like
    Blog Entries
    2
    Mentioned
    40 Post(s)
    Tagged
    1 Thread(s)
    Quoted
    899 Post(s)
    Interesting question, I will have a look at the book of words on Monday to see if there is a test.
    "I disapprove of what you say, but I will defend to the death your right to say it"

    Evelyn Beatrice Hall (1868-1956)
     
    0 0 0
     

  3. Re: Crown differential test 
    #3
    Join Date
    Dec 2007
    Location
    Nr Newport S Wales
    Posts
    37
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    5 Post(s)
    Thanks crasher.

    The tears have more tread left than the front but I’ve not yet checked the max difference allowed between front and rear which Elsa says is 2mm max. I’m sure my 6 has run with greater than this though without adverse effects. Theoretically more wear on the front should help as the front turns more than the rear on tight turns. It could even be tyre compound but I’d like to know for sure whilst there is warranty remaining. You have to go to them with data though not just a gut feeling.

    Cheers

    Dave
     
    0 0 0
     

  4. Re: Crown differential test 
    #4
    Join Date
    Jan 2007
    Location
    Nottingham, England
    Posts
    36,509
    Post Thanks / Like
    Blog Entries
    2
    Mentioned
    40 Post(s)
    Tagged
    1 Thread(s)
    Quoted
    899 Post(s)
    If you have ELSA I can’t go further than that without using ODIS with Guided Fault Finding when plugged into the car.
    "I disapprove of what you say, but I will defend to the death your right to say it"

    Evelyn Beatrice Hall (1868-1956)
     
    0 0 0
     

  5. Re: Crown differential test 
    #5
    Join Date
    Dec 2007
    Location
    Nr Newport S Wales
    Posts
    37
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    5 Post(s)
    No worries. I thought you may have had some other documentation. Elsa doesnít say anything about testing it only changing it. Maybe others with the same car can comment with its behaviour.

    There was a time the Passat did it too, but it kinda went away and I never got to the bottom of it but that has a different diff. I suppose I can probably lift one wheel with the box in neutral and as long as that one wheel turns, the diff canít be locked. Does that make sense to you?

    Dave
     
    0 0 0
     

  6. Re: Crown differential test 
    #6
    Join Date
    Jan 2007
    Location
    Nottingham, England
    Posts
    36,509
    Post Thanks / Like
    Blog Entries
    2
    Mentioned
    40 Post(s)
    Tagged
    1 Thread(s)
    Quoted
    899 Post(s)
    I would start by changing the oil, there are a number of TPI’s where the oil breaks down and causes noises which will be friction induced and the Crown diff works on... friction.
    "I disapprove of what you say, but I will defend to the death your right to say it"

    Evelyn Beatrice Hall (1868-1956)
     
    0 0 0
     

  7. Re: Crown differential test 
    #7
    Join Date
    Dec 2007
    Location
    Nr Newport S Wales
    Posts
    37
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    5 Post(s)
    According to the service history she had a gearbox oil change less than 20k miles ago so doubt itís that.
    I could go through the pain of swapping wheels from the6 to the seven to see ifthat helps but where do you stop...

    Doesnít sound right though.

    D
     
    0 0 0
     

Similar Threads

  1. Replies: 3
    Last Post: 22-02-2018, 08:17 PM
  2. Question Differential
    By ib1703 in forum Audi A4 - B8 Forum - 2008 - 2015
    Replies: 1
    Last Post: 23-08-2017, 02:20 PM
  3. B7 Rear Differential
    By Dalmation11 in forum Audi A4 - B7 Forum - 2005 - 2008
    Replies: 41
    Last Post: 20-11-2016, 08:37 PM
  4. Differential Problem?
    By Sparkie8 in forum Audi A4 - B6 Forum - 2002 - 2005
    Replies: 3
    Last Post: 21-08-2010, 01:23 PM
Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  


 



  


Disclaimer: VW Audi Forum is an "independant enthusiast website", administered in line with guidelines supplied by VAG in the UK, and is in no way related to any of the Worldwide Volkswagen,Audi,Seat,Skoda,Bentley,Bugatti,Porsche or Lamborghini group of Companies. For official up to date information on any of there vehicles, please visit the official websites. Any comments made throughout this website, are the views of the respective poster, and in no way represent the views of the VW Audi Forum Administration, or the worldwide Volkswagen & Audi Group of companies.


VW Audi Forum do not vet and are not responsible for any information which is posted in this forum. All content is viewed and used by you at your own risk and we do not warrant the accuracy or reliability of any of the information.


Copyright: Certain "words", "phrases" and "Images" used on this website by the Administration are "Copyright" of Volkswagen GB, Volkswagen AG (Germany), Audi GB, Audi AG (Germany), Volkswagen Motorsport GB, Volkswagen Motorsport AG (Germany), Audi Motorsport AG (Germany), Volkswagen Racing GB, Bentley, Bugatti, Porsche and Lamborghini. No image can be replicated by anyone WITHOUT the relevant Companies written permission.


All trademarks and copyrights remain property of their respective owners.

No part of the VW Audi Forum website or forum may be reproduced without written permission from the site administration


PLEASE NOTE - PERSONAL ABUSE, ABUSE AGAINST THIS OR ANY OTHER WEBSITE OR ANY COMPANY WILL NOT BE TOLERATED. OFFENDERS WILL BE MODERATED OR EVEN BANNED.


This website and forum are best viewed at a minimum resolution of 1024 by 768.



  



- VW AUDI Forum - The #1 Volkswagen (VW) Group Forum - Volkswagen (VW) - Audi - Seat - Skoda - Bentley - Bugatti - Lamborghini - Porsche - Scania - MAN - Ducatti - VW Audi Forum -


- www.vwaudiforum.co.uk - www.vwaudiforum.co.uk -