STaSIS diff

[Error404]

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

[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.

[HPmuirt]

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.

Surely the ratio between the front and rear output gears is just to give the static torque split of 60:40 that the new RS4 has, rather than 50:50 with the S2.

However I thought that the new RS4 could give up to 83% to the fronts or rears according to what was needed so these output gears surely cannot limit the extremes of the F/R torque split

Cheers n

Si

[Error404]

so would the rear diff ratio would need to be different to the front diff to compensate for that diff output gearing difference?

[Keeper of The Kitten]

It won't give 83% to the front - AFAIK the variation is actually still +/- 25% so the static 40:60 varies from 15:85 to 65:35?

[Keeper of The Kitten]

No the diff ratios don't need to be different front and rear ...when running in a straight line the internal gears in the diff don't rotate.

[Pirvu Eugen]

Is dificult for me to understand how 034 diff modification is 550 usd or something for 3 washers? I think is more involved in torque distribution. At those torque levels wich modified 20v turbo are running...1 washer on input pinion will not last too long. My opinion.

[quattro84]

The T-3 diff has this TBR:


Internals:

[Error404]

Right, quote back on these thrust washers: cheeeeep

INA LS3047 £2.01 ea + VAT
INA AXK3047 £0.83 ea + VAT

I'm happy to do a mini-GB on these if anyone else is interested. They'd then need to be machined to the right clearance for your diff, but this would at least supply the right base parts to replace the needle bearings in the 01E and 01A Torsens.
Whether it makes a massive difference or not remains to be seen but this is the STaSIS mod for a modest outlay

[Jamo]

How much is it going to cost to machine them? $550 vs the prices above hmmm

[4WheelDrifter]

Intersting stuff.
Lucky I didn't buy a STaSIS Torsen after I had a demo in Doug's S4 last year. I figured it's an easy thing to swap once the car's running, so put my purchase on hold.
I'll be interested in a set of washers though.

[HPmuirt]

Intersting stuff.
Lucky I didn't buy a STaSIS Torsen after I had a demo in Doug's S4 last year. I figured it's an easy thing to swap once the car's running, so put my purchase on hold.
I'll be interested in a set of washers though.

Me too

I was planning on getting a stasis soon as I have a spare torsen to PX so am definately interested in some washers please

Cheers n

Si

[Error404]

I'm looking into machining costs

Still confused by the details from Torsen on what you need to use, from the pics i linked above from a later 01E, simply replace the teflon thrust washers with steel - in our case there will be needle bearings instead of teflon washers.
Perhpas some one else can decifer the following into layman's terms - what do they mean by End Washer and Centre Washer packs? Are the nominal dims they quote of the stock washers or bearings in the diff? Or of the steel thrust washers to replace them? Why are there 4 different washer dims quoted for only 2 that seem to need changing

END Washer Packs:

NEEDLE BEARING - Purchase either INA or FAG Thrust Bearing Part Number AXK3047
Nominal Inside Diameter 30 mm
Nominal Outside Diameter 47 mm
Nominal Thickness 2 mm

THRUST WASHERS - Purchase either INA or FAG Thrust Washer Part Number LS3047
Nominal Inside Diameter 30 mm
Nominal Outside Diameter 46.5 mm
Nominal Thickness 3 mm (as purchased)
Rework Thickness 2.36 - 2.39 mm

CENTER Washer Pack:

BRONZE BEARING - Not commercially available, make from hard bronze
Nominal Inside Diameter 30 mm
Nominal Outside Diameter 47 mm
Thickness 1.98 - 2.01 mm

THRUST WASHERS - Use either INA or FAG Thrust Washer Part Number LS3047
Nominal Inside Diameter 30 mm
Nominal Outside Diameter 46.5 mm (as purchased)
Rework Outside Diameter 45.7 - 46.0 mm
Nominal Thickness 3 mm (as purchased)
Rework Thickness 1.55 - 1.58 mm

When replacing thrust washers or bearings, check axial stack clearance by inserting a feeler gage between bronze and steel washers. Adjust steel washer thickness, if necessary, to maintain a 0.08 - 0.20 mm clearance.

[redz]

Any update with on the machining costs ??

[Error404]

I did look at machining costs, but had a stupid amount on recently and not really looked at it again for the last few weeks.
Several places declined to quote as the machining was likely to deform the washers, one place quoted me to machine the washers, but never got back to me about making up the bronze washers. I need the chase them.

The machining costs looked to work out at approx £2.20 + VAT per washer based on 40 washers.

I will be moving house over Christmas, but in the new year i'll get back on this and try and tie up getting a few sets made up.


Can anyone interested in a set of washers to mod the centre diff please add their name to the list below:

Error404
4wheeldrifter ?
HPmuirt ?