another cheaper option for the people wanting to go LSD

[Gly]

being on a budget to do my LSD conversion,

i planned on doing the normal STR open rear diff + Evolution 4-9 LSD center

i have stuck with the STR unit,

but have used a Evo 3 LSD unit, (bought the whole pumpkin for $200+shipping)
opened up and inspected the LSD gears/friction disc's all good,

but will be doing the weir performance 12 anyway at a later date.

turns out the Evo 2 till 9 are the same asa reports them to all have the same part number, factory 1 way lsd
have also confirmed this with a few people on evolutionm forums

so far i have mated the STR crown to the LSD unit with no issues,
and can't see there being any.

[scott.mohekey]

That's great Carsten!

[miller]

There are Mechanical and Vicouse LSdiffs for the early Evos. Some of the RS had the mechanical yet all the GSR's had the Viscous.

I have an EVO 2 viscous LSD diff spare here, available at the right money!!!!

[Gly]

im lead to beleive.

evo 1 normally viscous but had the option for plate, but this has a different part number to the later units

evo 2/3 EVO GSR has a Viscous unit,

evo 2/3 EVO RS has a Plate unit,

this is how Mitsi ASA reports it.

funnily enough the bolt pattern on the evo housing cover is the same as the STR unit,
also the same bearings and even the bearing caps havent changed at all.

[Gly]

heres some pic's of my donor being disassembled

[scott.mohekey]

How different is the casing?

[miller]

Some of the RS's didnt come with it so its a bit of a lottery for RS owners! you need to double check the rotation to confirm its mechanical. Just a heads up!

[Gly]

How different is the casing?

basic design is very similar, but the mounts to the subframe is completely different.

Some of the RS's didnt come with it so its a bit of a lottery for RS owners! you need to double check the rotation to confirm its mechanical. Just a heads up!

good to know,
also the people who may do this with a viscous unit will need the CV cups that go with the unit,
as they are different to the ones used in a open or plate diff.

[miller]

Anyone is welcome to try my spare Viscous LSD I have here!

[Gly]

well the str/evo 3 lsd combo has been assembled....

using this guide... http://forums.evolutionm.net/evo-how...rear-diff.html

oh and as the guide say's the most difficult part is fitting the lsd back in the housing.
lost some skin

[Jesus-Ninja]

Well, this is a lucky find. I suspect my AYC pump is on it's way out. I have the adjustable pressure switch, but yesterday the light started coming on when cold. I'll try to wind some more out of the switch, but it did get me to thinking about diff options, and whether a mechanical LSD is a cheaper option, especially as it'd be a SuperAYC that comes out, which would go some way toward funding the change.

[scott.mohekey]

That looks really good! Is the cover plate painted or just cleaned up?

Edit: Nevermind, I see the paint in picture.

[Gly]

well all in so far,

STR diff and shafts $200nzd (cvr4 courier)
Evo 3 LSD diff $200nzd (+$50 parcel post)

(could possibly recover a few $$ selling a evo 3 open diff??)

Paint $15 for the stone guard, already had the hi-temp

$18 for 1L 85w140 nulon LSD oil (for a run in/flush), will be changing this to $38 for 1L of 80w140 Nulon Full Synthetic LSD oil.

need to buy new crush washers and a pair of shaft seals. sub $40 to finish it up

[crazydriver81]

Carsten, what you are saying to me is: get your hands on a Diff from an Evo3 RS? Great find, have some rep!

Did I get you right, that you just changed the RS-Diff internals over? Or did you swap other parts from the Evo3 unit as well?

[Gly]

get you hands on a mechanical LSD rear diff from evo 2/3 or 4-9
all you need from it is the LSD unit itself

and a STR or type-v rear diff (and shafts) (which you already have)
and the LSD is a direct swap in place of the open diff unit.


in theory you could also use a Viscous LSD unit from the EVO 2+ or 1.8L turbo GSR range
as long as you got the inner CV cups to suit these.

[SEAN-NZ]

how much abuse would that kind of diff take, compared to ours?

[Jesus-Ninja]

how much abuse would that kind of diff take, compared to ours?

Good point! Is this likely to be stronger or weaker than, say, a SuperAYC diff?

[miller]

The Evo 1 diffs both mechanical and viscous are interchangeable throughout the Evo 1 2 and 3 range, bar the driveshafts lengths may differ slightley between the Mechanical and Viscous diffs.

So even the Evo 1 RS/Mechanical diff will work. Surely even the viscous diffs will be an upgrade from the AYC?

[Gly]

the problem with the AYC units is that the casing is aluminum, and with hi torque loading (ie launching)
the casing can twist enough to cause extreme stress and the crown/pinion making them fail.

the STR and VR4 Type-V casing is Iron and much more durable,
infact the complete rear diffs are identical parts inside and out. (confirmed in ASA)

@Kenneth and @Adam.Findlay have been running this same combo with newer LSD units
without problems.....

Adam had managed to blow A LSD/STR diff when running RWD Conversion
but now has Shaft strength issues since revering to 4WD...
he is being very very hard on it though.

http://www.clubvr4.com/forum/showthr...-stronger-ones

so IMO the STR/EVO LSD is a fair bit stronger than the AYC unit.

i have lunched 4 AYC units in 4 Years,
each lasting fewer Km's than the previous, last being ~4000km

[Jesus-Ninja]

So, I need to find an STR / Type-V rear diff casing and shafts.

BTW - Gly, are you also Glycerine?