[torsen] Re: Torsen differential

Brett Dikeman brett at cloud9.net
Sun Nov 17 17:11:24 EST 2002

At 6:29 AM -0500 11/16/02, QSHIPQ at aol.com wrote:

>You'd have to define 'bulletproof' better IMO.

No, actually, he really doesn't.  In this case, the concern was 
whether it would present any additional reliability issues over a 
non-torsen equipped vehicle, from an owner's perspective.

The answer, quite clearly, is "no", as long as the vehicle is not 
towed improperly or placed on a two-wheel dyno.

The ONLY, and I repeat ONLY cases of failed torsens which I have 
heard about in 7-8 years, have involved:
-monkeylads putting vehicles on 2-wheel dynos
-towing with only two wheels off the ground
-lack of tranny oil or similar problems(improper oil, too-old oil, etc)

>  I really doubt that a torsen with 150k on it preforms the same as 
>one fresh from the factory.

Yeah.  I hear engines and transmissions don't show wear and perform 
the same at 150k vs. fresh from the factory.  Same thing for 
bearings, bushings, vacuum lines, hoses, electrical motors...

Here's a question.  Have you ever:

-had to replace a customer's torsen diff from wear+tear of daily 
driving?(abuse or neglect does NOT count here.)

-opened up a used torsen diff and inspected it for wear?(no, since 
they're not user serviceable)

-placed a used torsen diff on a test rig to see if it performed up to 
factory spec or not?

Any of the three would represent some sort of evidence.

>The problem in racing (audi learned this way back), really appears to be with
>any wheel lift or jumping action, then a sudden shock loading of the device
>when it gained traction again.  This appears to hold true

The problem in road driving(Audi learned this way back) really 
appears to be that it has ABSOLUTELY NOTHING TO DO WITH RACING.

I'm sure:

-racing vs day to day driving driver behavior
-racing clutches vs non-racing clutches
-racing/rallying suspensions with significantly harder suspension mounts
-wheels lifting and loosing traction vs. wheels staying on pavement 
not doing much at all
-sport in which handbrake slides(locking the rear wheels but leaving 
fronts spinning, hmm, no, that wouldn't affect a torsen at all) are 
common, versus day to day driving and even track use at qclub events 
where such things would never happen

...has ABSOLUTELY nothing to do with the subject at hand.  But don't 
let any of the above considerations discount the opinion of "Bubba 
The Redneck GM Racer Who Breaks LSDs."

Am I the only one who wonders why you manage to take a very simple 
question, not answer it, but still manage to blow it out into a two 
page rant full of anecdotal, circumstantial evidence that has little 
bearing on the original question at hand?

   I sure which you would apply such energy, enthusiasm, and supposed 
expertise into helping.

Seems like every time I see you post, it's just to nitpick with someone.

Curious that I hear more complaints about you than any other lister...

"They that give up essential liberty to obtain temporary
safety deserve neither liberty nor safety." - Ben Franklin

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