how to: mod 1 piece torsen diff. with pictures.

[k0mpresd]

me and my friend modded his b6's 1 piece center diff earlier this afternoon.

the 1 piece diff in my b5 was the exact same as his. so all these steps are the same for b5 and b6.

i figured i would let the pictures do the talking. post any questions.





you must knock the torsen out of the housing. hit the shiny part.

[aaaudiprotein]

Nice

[mxrz]

Approximately how many hours of labor?

[vdubstreets]

care to explain?

[F16HTON]

Here are pictures of my center diff...





...after the gears sheared off from shimming it with washers to add pre-load (the 4:1 modification)

[k0mpresd]

Here are pictures of my center diff...

...after the gears sheared off from shimming it with washers to add pre-load (the 4:1 modification)

i have already seen those pictures. i found them while i was researching the project.

it sounded as if staggered wheels was your problem. and not the actual mod.

http://www.socaleuro.com/forum/showt...x.html?t=13726

[k0mpresd]

Approximately how many hours of labor?

took us 2hrs.

[k0mpresd]

care to explain?

this turns your center 2:1 diff into a 4:1 diff. *cough*stasis*cough*

[n7plus1]

im still confused...i dont see any differences...i guess im retarded...

[F16HTON]

i have already seen those pictures. i found them while i was researching the project.

it sounded as if staggered wheels was your problem. and not the actual mod.

http://www.socaleuro.com/forum/showt...x.html?t=13726

Incorrect...

If you run a tire that is 235-35-19 all the way around, the tires are not staggered.

It has to do with adding preload which gives you incorrect gear lash...

...ultimately leading to premature failure.

[k0mpresd]

this mod does not add shims.

the washers going in the diff are the exact same size as the ones they are replacing.

i find it funny you havent posted in any of my other threads about this mod.

[F16HTON]

Did not know it was you that was selling the kit and I did not know this thread was related...

[audipotential]

Incorrect...

If you run a tire that is 235-35-19 all the way around, the tires are not staggered.

It has to do with adding preload which gives you incorrect gear lash...

...ultimately leading to premature failure.

The plot thickens

[absolutegtr]

Greg, please explain....because I am

What kompressed says is true....if indeed you adding these washers (with the same thickness) you should not be preloading anything, therefore the lash should remain the same...............

[k0mpresd]

Did not know it was you that was selling the kit and I did not know this thread was related...

theres also these threads...

http://audizine.com/forum/showthread.php?t=185323
http://audizine.com/forum/showthread.php?t=197354
http://audizine.com/forum/showthread.php?t=187867
http://audizine.com/forum/showthread.php?t=185312
http://audizine.com/forum/showthread.php?t=182610

[Laconvail]

I dont see this mod causing a failure. We even went and beat on it a bit afterwards.

[NyteEscape]

quick question...

if ur replacing washers with ones that are the same size, how does anything change?

i've been reading through all of the threads for this, but i can't seem to understand how it works. i understand the final product and what it's meant to do, just can't seem to grasp how it does it.

anyone care to explain to a simple-minded guy?

[Laconvail]

The orange on the removed washers is an antifriction (teflon) coating. The washers that go in their place dont have that so there is more friction than there was before.

[ngng]

just read all your threads, great info!

do you know if the B6 S4 uses a 1 or 2pc diff?

[k0mpresd]

just read all your threads, great info!

do you know if the B6 S4 uses a 1 or 2pc diff?

thanks. this is a good one as well. has some pretty good info in it. http://audizine.com/forum/showthread...hlight=shudder

b6 s4 would be 1 piece. but i checked etka. doesnt look like its an 01e diff. so im not sure what size washers it would take.

[NyteEscape]

The orange on the removed washers is an antifriction (teflon) coating. The washers that go in their place dont have that so there is more friction than there was before.

since there's more friction, can we expect more wear and tear?

[B6Lovin]

does anyone know what it would cost to get a b7rs4 diff second hand, and if it would even be a plug-n-play option for our cars?

i'd imagine it's much more expensive than other options out there... but i'd be interested to see how they increase the torque bias on the rs4 - THAT would the method i would be most interested in using.

[F16HTON]

B7 RS4 Center Diff part number is 0A3 409 751 J retail is $1015

A4 center diff part number is 01E 409 751 F and the retail is $1015

S4 center diff part number is 0A3 409 751 B and the retail is $1015.

[Laconvail]

since there's more friction, can we expect more wear and tear?

Probably not based on where they are in the diff. I will keep driving it and Ill find out. Im not worried though.

[Laconvail]

Probably not. You can talk to K0mpresd. He supplied me with the parts. He is running it too. He has no problems.

[B6Lovin]

B7 RS4 Center Diff part number is 0A3 409 751 J retail is $1015

A4 center diff part number is 01E 409 751 F and the retail is $1015

S4 center diff part number is 0A3 409 751 B and the retail is $1015.

hmm... so 0A3 diffs WONT "drop" in place of a 01E? or they will?

[k0mpresd]

Probably not. You can talk to K0mpresd. He supplied me with the parts. He is running it too. He has no problems.

if anything happens to mine, i will be sure to post about it. but for now everything seems fine.

and b6lovin, i dont think anyone here really knows the answer to that question. maybe, but i doubt it.

[actlsub9]

Ian, I was reading through a couple of your threads and I understand how everything works, but I did not find where (or if) you explained how you know the friction of your washers makes the torsen a 4:1 as apposed to a 3:1 or 5:1 or 6:1 etc...etc...

[B6Lovin]

^my guess was either trial and error with materials (seems unlikely) or because that's the way that rs4 diffs are constructed... hence i asked about that earlier.

but it appears that nobody knows much of anything about the rs4 diff.. atleast not anyone in the b6 forum

[ngng]

Ian, I was reading through a couple of your threads and I understand how everything works, but I did not find where (or if) you explained how you know the friction of your washers makes the torsen a 4:1 as apposed to a 3:1 or 5:1 or 6:1 etc...etc...

torsen supplies the washer tolerances and the expected outputs

[sean1.8t]

torsen supplies all the info anyone could ever want about their products on their website. if you feel the need, go look it up and read it.

but Ian and a few others have spent countless hours researching this stuff for you. so you don't have to.. just like STaSIS.

only, this is a fraction of what STaSIS charges.. and they actually use quality, precision machined washers. instead of shims

[GTMRS4]

how much is this?

[k0mpresd]

torsen supplies the washer tolerances and the expected outputs

i actually called them on the phone and talked to them about the mod.

how much is this?

please see my other thread for details. this is thread is solely for information, not sales. and is done under my personal username. http://audizine.com/forum/showthread.php?t=206708

[actlsub9]

torsen supplies the washer tolerances and the expected outputs

torsen supplies all the info anyone could ever want about their products on their website. if you feel the need, go look it up and read it.

Can you point me to where on their website it describes the relationship between the coefficient of friction of the washers to the torque bias ratio.

Ian, if this is something that they told you directly ie: "if you use a washer with a coefficient of friction equal to X then you get a X:X TBR" then just say so. I don't need any proof or anything, not doubting you at all, I'm just curious as to how you choose what material will give you a TBR of 4:1.

[k0mpresd]

they actually said bronze is a better material to use than steel because bronze will never "weld" to steel. but said steel works fine. even the washers they recommend to use as replacements are steel.

check #19. http://torsen.com/fsae/fsaefaq.htm

the only thing about flip flopping the washers in the audi diff is they are both teflon coated. it appears the diff they are referring to in #19 uses 1 du4 coated and 1 bronze washer.

[k0mpresd]

bump. check sig. ;)