STaSIS diff

[Keeper of The Kitten]

In fairness the operation of the changing distribution relies on movement in the internal gears but I am talking about the static distribution.

[Error404]

Have you read the link with info from Torsen themselves on this?

[Keeper of The Kitten]

I'm with Pirvu here, partly anyway.

Preloading with shims is a limited slip thing, not a torque distribution thing.

But this is my understanding:

Look at the big illustration of the S-tronic gearbox and you can clearly see that the output gear in the diff for the rear drive flange is larger than the output for the front drive. This makes the gearing to the rear output lower, hence increasing the torque to the rear.

[Pirvu Eugen]

I dont think so.... I think is more related to the angles off the pinions teeth.

[Jamo]

You've got it

[Error404]

So just to check that i am not being a total retard and have got this straight, My head is spinning a bit after reading all of that info about 3 times
We would simply need to replace these two orange thrust washers (which would be needle bearings in our case) with steel thrust washers of the same size, (machined for clearance) ?

[Jamo]

who's up for giving it a go then?

These guys distribute in the UK. I'm going to get in touch for a quote if anyone is interested in a mini-GB?

Worth investigating at least.

[Error404]

who's up for giving it a go then?

These guys distribute in the UK. I'm going to get in touch for a quote if anyone is interested in a mini-GB?

I think it would be wise to get machining done individually after checking clearances, as there will probably be some variance there.

can you use this diff also for on the dragstrip? are shouldn't it make any diffrents with the start?

[quattro84]

Hum, the new version, 40:60 version that is, is completely different in construction. Up to "now" Audi has been using T-1 torsen, and that new is T-3 (http://www.torsen.com/products/products.htm)

You are right.. Enough publicity talk about it though, i can't find any pics of the T-3/RS4 Torsen itself other than on the Torsen site.
S-tronic still uses T2 by the look of it.

[Jamo]

so does the 01E and the 01A share the same centre torsen?
worth a go with a spare diff if it only means swapping some shims, and not a huge job to swap diffs

http://www.motorgeek.com/phpBB2/viewtopic.php?t=21542

[gedu]

Hum, the new version, 40:60 version that is, is completely different in construction. Up to "now" Audi has been using T-1 torsen, and that new is T-3 (http://www.torsen.com/products/products.htm)

[quattro84]

Probably extremely expensive, but if all the future S-tronic gearboxes are going to use it, then it's most likely a lot of those are going to find their way into scrapyards & so one.



It still looks like the Torsen sits in it's own bolt-on casing. Let's hope that the VAG engineers still are as lazy as they were and didn't change much.
Let's see if i can get hold on to some outside dimensions, aswell as the spline setup and the outside bearing bore.

[Keeper of The Kitten]

I've been interested in this too, but it would be nice to know if it can be made to fit and if it is not so prohibitively expensive!

[quattro84]

It seems like it's all up to the friction coefficient of the shim-material.

I'd like to get my hands on the latest RS4 center Torsen.. 40:60 normal bias with a max of 88% to the rear diff. Can't figure it out how this thing works.. although i've seen that the newer torsendiffs use a wider spidergear.. perhaps it's accieved by 2 different widths in centergears in stead of two even gears.

Edit: take a look at the cut-open models of the new S-tronic gearboxes, these Torsendiffs are using different radius helicals gears!