V8 Torsen on rear

[auditude]

Torsen and LSD are 2 different things.

Yeah, Torsen is an ATB, right? (automatic torque biasing) Limited Slip can only lock the two outputs to reduce slippage, while the ATB can actually send torque where it's most usable?

[quattroTurbo]

Audi V8 and A8 use a rear Torsen differential.

[The Spanish]

A8 doesn't. Only V8

[Henka]

Too bad I didn't get ETKA up and running to check it out... I wanted to be the one who pointed that out. It's a shame that the S8 doesn't utilize a Torsen at the rear - that way we would have had a 340hp-safe rear Torsen to bolt into our cars.

I'm going down this road soon too. Want one up front too however.

[caterpillar]

use from porsche.... they will fit up front i think

[Albert]

Imposible to locate. And the one that is more common is the ZF version insted of the Torsen one.

[audiman]

The rear diff will take more than 340bhp IMO.

[The Spanish]

I think there will not be any problem. The center Torsen handles 100% of monster power without any problem. The rear just has to handle 66% (centre torsen is 2:1) of the Total power of the Car max.

[Henka]

Yes, I too do believe that it will take the heat. The center diff is roughly the same size and as you say it handles huge hp with no fuzz. The rear should do fine. It's just that in the last thread about this someone mentioned that some V8 owners had expirienced problems with rear diffs wearing out. My general theory is that eventhough the rear diff housing is said to be sealed for life the oil in that diff needs to be changed. The Torsen unit is relaying on inner friction and this friction is to be transferred through the oil. IMHO this means the oil must be changed. And the V8 is no lightweight either.

[audiman]

I agree, all oils should be changed if they are expected to do any type of work

[S2central.net]

I second this motion...

[Audi Parts Guru]

The Torsen diff is a torque biasing diff, ie, torque is transfered to the wheel or axle with the most grip

[Audi Parts Guru]

Trying the diff movement. Seem to work Ok.

Both diffs were spares so I am finishing the rear brake project next monday-tuesday and test it with standard diff. In 2-3 weeks I will swap the whole rear diff box with the Torsen one.

Just make sure that you set the bearing pre-load correctly and that the crown wheel and pinion are set so that they mesh correctly !!!!!

Setting up a diff is not as easy as some may think !!!

[The Spanish]

I am very lucky. It is being done by a racing team
Will comment them but I am sure they know what they are doing.

Thanks a lot for pointing this.

[Henka]

When changing the diff and NOT the gears without even touching the pinion the only thing you need to check is backlash.