2009 Audi A4 Avant B8

[Dave]

there is a confusion between the  torsen type 3 (or "c") diff as in the previous rs4 which is a planetary diff (using the planetary gears to provide a true static torque split) and the "crown gear" diff which is an audi design, quite different to the type 3 torsen and in the latest rs 4 & 5. from what i understand the crown gear diff cannot support the torque of the v8's so the type 3 is used in the zf auto cars...

cheers


> On 23/09/2014, at 9:01 am, Cody Forbes <cody at 5000tq.com> wrote:
> 
> The crown diff is most certainly made by Torsen.
> 
> -Cody Forbes (mobile)
> 
>> On Sep 22, 2014, at 3:17 PM, Dave <dave.eaton at clear.net.nz> wrote:
>> 
>> the crown diff is not a torsen, but an arrangement of different diameter
>> crown gears that splits torque.  description on how it works is up on
>> wikipedia.  the rear sports diff is also not a torsen design...
>> 
>> 
>> dave
>> ¹08 rs6 avant
>> ¹12 vw alltrack
>> 
>> 
>> 
>> 
>>> On 23/09/14 7:00 am, Cody Forbes wrote:
>>> 
>>> 
>>> - RS5 introduced the new crown-gear center Torsen with variable torque
>>> bias front to rear. I think it's still the only car with it, or maybe
>>> B8.5 S4's can get it optionally.
>>> - "Sport Diff" rear differential which is standard on RS cars and
>>> optional on S cars starting with B8. It's a complicated arrangement of
>>> torsens and clutches that allows torque split to be changed left to right
>>> (torque vectoring).
>> 
>>> -Cody Forbes (mobile)
>> 
>> 
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