R160 lsd or not

[speedfreak]

Ive pulled a couple of diffs apart and they both look like the lsd types,

Can anyone elighten me?

[Koom]

First one looks like it\'s an open diff?

[speedfreak]

 Koom said:

First one looks like it\'s an open diff?

So the first one is open? ok wasnt sure as it appeared to have plates to the crown side of the spider gears

Wasnt sure as I\'ve never had a subby diff apart before

[Koom]

I\'m not 100% as it\'s been a few years since I\'ve had one apart myself.

[DRFVDR]

the problem with subaru is they run 4 types of diffs, open,vlsd,plate lsd and a torsen type they all look different

the top one looks open to me but I am probably wrong

[kamineko]

i\'m going to suggest the top is viscous limited slip. the 2nd looks mechanical clutch type

[funkytown]

first id pick to be open, the second mechanical

[kamineko]

place your bets!

[speedfreak]

Guess i better open it up to find out then lol

So the second one could be a subaru plate type or is a after market mechanical type?

[funkytown]

there is a factory mechanical type found in a v2 sti ra, or some of the later v5 sti R, v6 sti R, and i think RA of each.

scratch that - v2 sti ra is the only r160 mechanical factory type, they others are r180

[kamineko]

not that useful to this convo but pretty sure the V2/3 STI also got the r160 mech, at a 4.something ratio

[speedfreak]

Ok first diff does look open, no smart bits found, just the left side spider is part of a larger piece

[kamineko]

yar! that large lump is the viscous coupling.

http://en.wikipedia.org/wiki/Viscous_coupling_unit

[speedfreak]

 kamineko said:

yar! that large lump is the viscous coupling.

http://en.wikipedia.org/wiki/Viscous_coupling_unit

ah, i see, thanks for the info

ahh well, i might see if anyone wants to swap a LSD center for an Open on, seems a shame to weld up a perfectly good LSD lol

on a side note the other diff is the a way of telling if its 1 way, 1.5 or 2 way easily?

[kamineko]

you should be able to tell by the shape of the groove that the cross-shaft sits in

http://www.limited-slip.com/acatalog/How_A_Cusco_LSD_Works.html

this one is selectable if you rotate the cross-shaft

[funkytown]

thats for cusco diffs though nick..

from memory the Subaru factory ones are sealed up.

Fwiw. hes brough the v2 sti ra one i sold to Roo and is asking about that diff specfically

[Roo]

 funkytown said:

thats for cusco diffs though nick..

from memory the Subaru factory ones are sealed up.

Fwiw. hes brough the v2 sti ra one i sold to Roo and is asking about that diff specfically

Got it today actually

[speedfreak]

Lol, funny story, the diff in the second pic i already owned, so it looks like i have 2 plate lsd now, one is a 4.1 and the one i just got is a 3.9.

Should have opened it up first lol

So i now have 3plates includin the one in the rally car, plus 2 vsld the 4.44 woll go on the speedway car, plus 3 vsld with thr stub axles poking out, hmm deff time for a garage cleanout....

[Roo]

Diff hoarder lol

[kamineko]

 funkytown']

thats for cusco diffs though nick..

from memory the Subaru factory ones are sealed up.

Fwiw. hes brough the v2 sti ra one i sold to Roo and is asking about that diff specfically

confusing desu. didn\'t you have your r160 mech re-shimmed? how are they to do that if its sealed? i think you\'ll find the basic design of a mechanical clutch diff similar enough that the cusco info is a useful example. left/right differential torque through the spider/pinion gears rotates the cross-shaft. depending on the cam angle of the cross-shaft and the groove you end up with expanding pressure on the clutches. in my previous post you can clearly see the two different set of grooves for 1.5 and 2 way setup

[quote name='speedfreak said:

..

on a side note the other diff is the a way of telling if its 1 way, 1.5 or 2 way easily?

..

you can see cross-shaft setup through holes in the diff casing, but no harm disassembling for fun

img]http://www.limited-slip.com/acatalog/waydiff.jpg[/img]

[speedfreak]

 kamineko']

thats for cusco diffs though nick..

from memory the Subaru factory ones are sealed up.

Fwiw. hes brough the v2 sti ra one i sold to Roo and is asking about that diff specfically

confusing desu. didn\'t you have your r160 mech re-shimmed? how are they to do that if its sealed? i think you\'ll find the basic design of a mechanical clutch diff similar enough that the cusco info is a useful example. left/right differential torque through the spider/pinion gears rotates the cross-shaft. depending on the cam angle of the cross-shaft and the groove you end up with expanding pressure on the clutches. in my previous post you can clearly see the two different set of grooves for 1.5 and 2 way setup

[quote name='speedfreak said:

..

on a side note the other diff is the a way of telling if its 1 way, 1.5 or 2 way easily?

..

/quote]

you can see cross-shaft setup through holes in the diff casing, but no harm disassembling for fun

yeah i assume the mechanism works the same, just need to disassemble to find out, the second pic is all i can see of the split so cant really see the shapeof the grove