So last year I bought a Cusco Type RS LSD (Stock is VLSD) and procrastinated putting it in. Over the winter I will attempt to doit myself.

Most of the procrastination was from the documentation being in Japanese. I've seen a few threads on my350z with guys opening up their diffs, but not real tutorials/steps for them.

I wanna fill that gap. I'll update this as I go through my Cusco LSD Installation. I like to atleast attempt to do things myself. This is one of those things...

The Cusco LSD is a 1.5/2way clutch LSD with adjustable lock-up. The LSD ships as 1.5Way and 60% lockup. The more I read, the more I found out that 60% is good for street, but you atleast want 80%. So I decided I would try 80% which means re-stacking the clutches in the LSD. There are 3 options, 60%, 80% and 100%. 100% being the most agressive. Since the car sees mostly street and some track I've decided to go with 80%.

Documentation and LSD as shipped.


Cam is locked at 1.5way in this config.



My goal, 80%


Marked for future refrence although I don't think it matters.


Pop the top off by un-screwing the 5 hex style bolts that hold it in place located on the opposite side of this picture.



1 by 1 I pulled out the clutches, confirming this infact was shipped as 60% lock-up.


Once the left (I say left because of the orientation in the diagrams.) set of clutches are out, you need to remove the side gear. There are springs (in this particular LSD) so watch where they are. I didn't realize this but put them back in the most logical locations.

I had to give this a tap with a punch/hammer to get it to pop out, It wouldn't slide out by hand...


Once removed, we can now see the spider gear (I think thats the term) or the technical term "Pinion Mate gear".



Remove the other side of the side gear and you see the right (again orientation of the diagram) side of clutches.


You can tip the casing over and out come the clutches


60% config.


Now you just need to re-stack according to the diagram and configuration you want.

Restacked to 80% as per diagram, with springs installed.


Re-stacking completed.


Line up my location markings and screw the casing back together.


There we have it, 1.5Way and 80% lock-up.

Stay tuned for when I pull out the stock diff and swap guts.

 

It doesn't come preset to 60%, it comes preset to 100% from the factory. We ship them as customers request them from us. If customers don't specify, we actually set them at 60% because that's what we've had the best overall results with in mixed use driving. But, customers can request any combo of 1.5 or 2 way, and 60, 80 or 100% lockup prior to shipping, and we set it up this way per their request.

As for the lockup %, it is totally subjective. There is no right or wrong, just different. I have run mine at 60% since forever and have no need for anything more. 60% represents more than 3 x the factory VLSD lockup - and that's assuming a brand new unit. Others may want a higher lockup if they do more high speed track use. For mixed use of street and street/track, I personally found 60% to be the best for me...ymmv

 

Thats for the info, I didn't request a lock-up so it was shipped to me at 60%.

I'll see how I like 80%.

Theres just such a lack of english documenation for this product I thought I would make an attempt.

 

Cool...let me know how 80 feels....

 

So you saying best setup is 60%? I have a Front wheel drive and i would like to know which is the best setup for Drag/Street..

Thanks!

 

the best for a Z I find to be 60%. I cannot comment on a front wheel drive car

 

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i have acquired a used cusco rs set to 2 way. if i wanted to set it to 1.5way, i need to rotate that cam to the orientation above. is it difficult to rotate? will i need tools? i can do this without popping out the diff from the housing?

 

You'd have to pull out the LSD from the Diff, open it up and flip the cam.

 

Thanks for that.

I pulled the diff and had to rotate the cam and place it in the appropriate slots for 1.5way.

The I couldn't make note of the spring configuration before pulling it apart. When i pulled it apart the springs just fell everywhere. I just placed them back in the spots like the OP (I believe there were 6).

I put everything back in my other pumpkin and everything turned like it should, so i guess it worked. Won't know for sure until i drop it (or should i say, lift it) on to the car next week (or whenever i get my solid diff mounts in).

 

Yeah same thing happened to me with the springs.

 

fuuu.
this thing is a nightmare.
I am reassembling my diff and carrier after making a switch to the cusco rs lsd. Now I thought C clips came pre installed. I can see the C clip on the right side.



I cannot see one on the left side.


The Right side long stub axle clicks in solidly.

The Left side short sub axle slides in and comes out too easy.

Do I need to put a C clip on the left side? If so how do I do that?

 

this is for the oem.
I have the (17) circular clip
Just don't know if I should try to slide it on the stub axle and instal it into the cusco like that?


And after a couple hours of searching the net... this looks like the right thing to do to the flat ended axle stub.
Just want to make sure from one of you with experience before I drive it in to the LSD.

 

Hmm...not sure, I looked at my old pictures and I only took pictures of 1 side, so I assume when I was doing the install it came with both. I remember one side being harder to get in than the other too.

I didnt use the c-clips I bought, I know that much.

Sorry man not really helpful; but Id assume you're ready to push it into place.

If you look at the manual picture you posted, only 1 side has a c-clip as well...

 

Yeah that is what I was thinking. And that clip is on the left in the diagram.
If you look at the inside of the oem vlsd there is a clip installed just like on the cusco on the right as well.
So it would seem putting this clip on the left then driving it in is the right thing to do.
I'll find out tonight and post if it seems to be right.

 

So yeah.

Put that clip on the groove on the stub axle and shove it in.
I noted today when I got home from work that the groove in the stub axle lined up at the exact distance with a corresponding groove inside the LSD.

Everything is rock solid now. Just my backlash is loosey goosey. Oh well.

 

You measure it before?

I thought the same but since I didnt take a measurement before it could have been the same. Anyways, I didnt have an issue or any noise.