Torsen w/o prop shaft

[urq]

I believe what is being discussed is that the pinion bearings inside the
diffs employ sleeve type bearings and are not intended to see a lot of
rotation; as you would see with mismatched rolling distances at the wheels.
Similarly, pinion gears that do not turn at all can suffer wear on the gear
faces.  Of course the pinion gears are turning any time the car is not going
in a straight line ... and even sometimes when it is.  

Of course over the long term you will see wear on the pinion bearings, but
as long as they are properly lubricated this should be over a very long
time.  I bought a 5kQ serviced by a "reputable" Audi shop which had a
non-turbo transaxle and turbo rear diff.  This meant that the FDR to the
front and back wheels were different ... which meant the pinion gears in the
center diff were spinning any time the car was moving ... I don't know how
long the car was driven in this condition, but the center diff never gave
out ... 

... all that said ... none of this matters for a car with a torsen center
diff ... if you have the prop shaft removed the car will go nowhere.  The
only "old style" Audis that can be driven without a prop shaft installed are
the ones with center locking diffs ... and BTW, in those cars you do not
have to worry about pinion bearing wear because the center diff is locked so
that the pinion gears do not turn.

Steve Buchholz

-----Original Message-----
From: quattro-bounces at audifans.com [mailto:quattro-bounces at audifans.com] On
Behalf Of L DC
Sent: Saturday, August 13, 2011 8:05 AM
To: audi at humanspeakers.com; Paul Caouette
Cc: Dave; quattro at audifans.com
Subject: Re: Torsen w/o prop shaft

Hi Huw:

Safe to assume you refer to Audi when you say "The old 4wd.." and not just
any old 4wd of the era?

Regards,


-Louis

----- Original Message -----
From: Huw Powell <audi at humanspeakers.com>
To: Paul Caouette <paxnobis at gmail.com>
Cc: Dave <dave.eaton at clear.net.nz>; quattro at audifans.com
Sent: Thursday, July 28, 2011 2:04 AM
Subject: Re: Torsen w/o prop shaft

Abusing a differential can be an expensive experiment.  The old 4wd 
folks learned not to run mismatched tires the hard way.  Don't hurt that 
A8Q with a silly short cut.  Push it or trailer it.

On 7/28/2011 1:14 AM, Paul Caouette wrote:
> I hope you try to move it.....my logic says since the torson would
consider
> the shaft spinning as "no traction" to the rear it would transfer torque
to
> the front....
>
> paul from my droid
> On Jul 27, 2011 9:13 PM, "Dave"<dave.eaton at clear.net.nz>  wrote:
>> nope - won't move a foot. the torsen diverts torque from the output shaft
>> with the least traction to the one with the most. in your case as this
>> shaft has 0, nada, traction, there is none to apportion. so no movement.
>> the torsen is very like a lsd in this regard.
>>
>> propshaft out, you need to tow it. flatbed highly desirable.
>>
>>
>> Dave
>> '08 rs6 avant
>> '04 allroad tdi
>>
>> On 28/07/11 1:08 PM, "Cody Forbes"<cody at 5000tq.com>  wrote:
>>
>>> ------------------------------
>>>
>>> Date: Wed, 27 Jul 2011 18:18:46 -0400
>>> From: "Cody Forbes"<cody at 5000tq.com>
>>>
>>> I've got the prop shaft out of my A8q. How does a Torsen car behave
>>> without it? I'm planning to move the car a couple hundred feet into a
>>> different parking space, but was wondering about driving it ~20 miles
>>> home.
>>>
>>> -Cody
>>>
>>
>>
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