Z31 Lsd

so from wat i hear a 87-89 z31 turbo diff is a lsd, almost a direct bolt on so wat has to be changed to work and do all turbo z31s from those years all have lsd......theres one in my local pulla part...and if they dont how can i identify...i searched here didnt find anything...or maybe im retarded

1987-1989 300ZX Turbo's cam equipped with LSD's starting in april of 87 (4/87)...look for a finned rear diff cover.

if it's an 88SS with the VLSD you'll need the CV shafts as well.

someone is selling a 1990 300zx VLSD with a 240sx diff cover, and it has the five lug half shafts....would this thing work/bolt into my car?

no, its a short nose r200. we use the long nose diffs. thas only a swap for the 240sx guys. you'd need to source a z31 diff, not z32.

oohhh okay gotcha, thanks

wouldn't a Z31 diff be fairly tired and acting more like an open diff nowadays ?

CamInHeadwouldn't a Z31 diff be fairly tired and acting more like an open diff nowadays ?

wouldn't it make more sense to buy a diff made for a 240 and put it in the stock cases? o.o

VG33ERGazelle?wouldn't it make more sense to buy a diff made for a 240 and put it in the stock cases? o.o

MaxpowYeah it would probably need a serious rebuild.

I have had a Z31 clutch type diff.  They are actually quite cool.  But yes, they would generally be tired at this age.  A rebuild is recommended as it wont hold consistently.  Also, when doing a rebuild, put in some more discs if you can.  That will help improve the grab.  If I remember, the Z31 diff has 5 spring discs and aftermarkets usually have 7-9.  If you do the rebuild yourself, it's not too bad.  But the amount you are spending on the rebuild and the diff. itself (because they can go for crazy amounts), you may as well obtain a R200 diff from a S13 and call it a day.  But if you happen to grab a Z31 clutch type for dirt cheap or was given one, def. go for it.  It is by far the cheaper way in that case.

I got rid of mine to a buddy who was happy with the way it was.  Apparently he had a bum Z31 clutch diff. and was gonna play around with the spring discs or some such.  Either way, it fit his needs.  I am looking to go helical personally.

ArroYou cannot rebuild a VLSD, they are sealed units.

Buying a used VLSD is always a bad idea as you have no idea what condition the viscous fluid is in. As the fluid gets old and abused, it burns and loses its viscosticy. A used VLSD may be 80% of what it was, or 40%, or completely gone, and you'll have no way of knowing, not even after it's installed, because there's no way to measure the remaining performance life left. Not by any means.

If the VLSD wasn't sealed, the viscous fluid would leak out under pressure, and if you "opened" it, the viscous fluid would leak. There is no procedure or specs on how much viscous fluid is inside, nor are there places to just buy viscous fluid in bottles. Please show us where on Zilvia you got this info from, because AFAIK there are no "shims", the grab is the result of the viscous fluid's friction property, and the design is nothing like a clutch type or torsen. When the diff spins too fast, too soon, the fluid doesn't pass through the parts quick enough, and causes enough friction to nearly move all differential components in unision, causing a differential lock-up momentarily. The advantage of a VLSD for OEM applications is that it works reasonably well, and because it is sealed it is virtually maintenance free for the life of the differential. After it fully fails, it just acts like an open diff, which for 95% of consumer car buyers is virtually undetected. So it never comes back for repair, either way. Good for OEM's. Not good for those of us who want a cheap, used LSD that we can beat on and expect it to lock on demand.

If someone posted on Zilvia that they "shimmed" a "VLSD", maybe they were mistaken.... some Nissan LSD's are like what Colin said, clutch-disc type. Clutch type LSD uses shims to increase pressure on clutch discs and that changes the point of engagement to lock the differential (which is what Colin was talking about with adding more discs too).

I'm not trying to say you're lying about your diff, but are you sure it's a VLSD?

The silicone oil is factory sealed in a separate chamber from the gear oil surrounding the rest of the differential. This is not serviceable and when the differential's behaviour deteriorates, the VLSD centre is replaced.

MaxpowYes.

shimming- http://zilvia.net/f/s-chassis/200226-shimm...0-j30-vlsd.html
please read the whole artical
also as for the viscious coupler unit inside you can order one new from nissan, however it is around 400 new. but yes you can rebuild them. if you would like i can get the part number.

Ok so the shims are outside the sealed component, and change the engagement point of the VLSD. But a "dead" VLSD can't be fixed by shimming the outside. You still would need the viscous fluid in reasonable condition. I can see where this would be a good idea for a low-mileage VLSD, but like you said, replacing the sealed viscous center is around $400, and that's about what you'd pay for an OBX torsen which is far stronger and will basically last forever if installed correctly.

yes it is around 400 but if you have no other choice you can rebuild it... freeking a i need to shim my diff now that i think of  it

Well om being told by a friend that the this diff won't work on our cars at all.... I dunno I found one at pull a part with the fins on the diff cover is this the one that ill need the axles to or not and they want 300 for it... I dunno thinkin about it

It's pretty much my present opinion that anyone not willing to at least spend $400 on an OBX torsen, or a bit more for a Nismo clutch-type, should just save their money and weld their diff. "LSD" and "used" just don't seem to mesh well in my head as a smart purchase.

^ I feel the same way I was ok with it cus I thought it was rebuilable but now I'm not gunna do it....so I need the nismo 2 way for a 240sx open diff?

Need? Well you could go that route.

Or, what I've been casually dropping into conversation recently is that you could go with a torsen-style from OBX for around the same price, and have something far more solid with no need to ever replace clutch packs.

The obx is better than the nismo?...I know I don't need to but I meant wat would I order if for obviously not for an s12...a 240 open diff. Not the lsd right?

VG33ERGazelle?good...cuz that's what I was going to do anyway <.<

Wouldn't be worth the time and money to try and resell...unless someone wants me to pick it up for them?

just a quick question...

would the OBX torsion drop into our diffs, or would you need to swap to a 240 dif/housing? (Assuming its a "240" diff that one would be ordering for..?)

Pretty sure you take the s13 diff and put it in our diff housing and swap the lsd in with it. I'm fuzzy on the whole thing.

I'm pretty sure u order it for a 240sx with an open diff and I think it fits right in our diff case....correct me if I'm wrong please....wantin to buy me a lsd soon so would be good if could be clarified

If you use a S13 diff, you need to be aware that they are a short nosed R200 and the S12 only received the long nosed R200.  You can take the diff. from a S13, but you need to keep the ring pinion that is necessary for the long nosed R200.  The two are different and size up differently.  Other than that, it should work just find.

im so f'ing confused im retarded!!

turbo-s12im so f'ing confused im retarded!!

1. Buy diff(LSD) for 240sx, MADE FOR OPEN CASING/AXLE.
2. Install in S12 differential using the S12 ring gear. You may need spacers depending on the ring gear size(M10 or direct fit for M12 bolts).
3. Set backlash and check tolerances. FILL DIFF.
4. DRIVE.

As usual, Hung to the rescue.

/thread

Thank you for the clarification...makes sense now it wat I thought just got confused a lil...ya someone do a thread!

mod_mastaz 1. Buy diff(LSD) for 240sx, MADE FOR OPEN CASING/AXLE.
2. Install in S12 differential using the S12 ring gear. You may need spacers depending on the ring gear size(M10 or direct fit for M12 bolts).
3. Set backlash and check tolerances. FILL DIFF.
4. DRIVE.

No.

i thought so....damned r180s...

There are I believe R180 LSD's.

I'm just gonna run a welded R180 for now.

Frankly, by the time I need something stronger than an R180 welded diff, I'll also want a 3.90 R200 from an SE because my turbo 4.11 R200 will just spin the wheels like crazy. A 3.90 will let me put the power where I need it.

Edit: http://members.optushome.com.au/amaxeng/five10/diff.htm

I'm sure more google time will yield other R180 LSD options. I would also assume that like the open-style S13 diff, you'll need to keep your R180 ring gear.