type torsen... http://www.torsen.com/products/products.htm
at least regarding modifying the bias ratio using clutches, and oils etc.


ehh, pretty far from what looks like a T1 on the A4 (and bigger T1) and on the S4.

While changing viscosity does add friction and helps a limited slip, it doesn't apply to our cars as it is one big system, including the tranny. Unless one plugs the torsen housing, and install fill and drain plugs, then "slight" torsen bias ratio will be changed. Slight because well, most of the bias ratio is accomplished by the shape of the helical gears.

However, there is a trick which looks like I read also in the faq. Racers isolate the gearing housing (wrap it in sheet metal?) and can fill that inside with the heaviest oil. That should also help (T2) but if I were to go to all that trouble, I'd rather weld the gears in place.

However, his link did point me back to the product page above, and looks like they have an new product which should be a pretty good replacement to the (T1) one we have. The T3 which employs what looks like to me a planetary gearing system (a bit similar to auto tranny) means that you can set the normal bias ratio 65% rear, 35% front. That should be sweet!

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FAQ
Mk1 A4 - by BSK
Mk1 TT - by QuietsTTorm