http://mazdatrix.com/G8LSD.HTM under the section 81-88 Limited Slip Differential Rebuild Clutch Parts:

Two oversized trust washers and two oversized clutch discs should help it lock better. Although the one one I pulled apart had a decent amount of wear on the cone springs(what puts pressure againt the stack), so you may want to consider 2 of those.

 

use beer cans.
https://www.rx7club.com/2nd-generation-specific-1986-1992-17/s4-lsd-soda-can-shim-trick-942835/

or legit clutch type rebuild
http://forum.miata.net/vb/showthread.php?t=200846

or take one of those extra open diffs and weld it. aint no thang

 

Oh sweet Jesus, I need 4 at 46$ EACH? HELLL no dude. I can't play like that, lol...

 

This is what I'm thinking about doing for this event. Problem is, I can't weld...

 

Just do it and have fun man. Seriously, I see people with open diffs and stock suspension have more then most and get more angle then some of the hardparkers that talk out of their asses with a 1.5way and PBM coilovers. LEARN YOUR CAR AND GO FOR IT...and be safe.

 

Well, I tried a skidpad once, and I was super disappointed in my stupid open diff. I was hoping to have one that would help control the car a little better by the next time I tried it. It looks like I'm going to be welding my spare open diff this Saturday, so I'll go ahead and swap that one in, then maybe rebuild the GXL one I have. Who knows.

 

You dont need 4 new clutch's. The two oversized thrust washers will shim the stack out, putting two new oversized clutches in is for added measure. All told is like $120. If you cant spend that to get the lsd to lock well just gut it and weld it(im not of fan of that).

 

Oh ok, so all I need is two of 27-2570-M020 (LSD Disc w/inside pins +.1mm ) And two of 27-2530-M020 (Oversized Thrust Washer)?

 

I did it with only two .1mm thicker thrust washers and it locks alright now. Since im doing rear bushings im putting some new goodies in there.

Does your current gxl diff lock at all?

 

It locked once or twice right after I swapped it in. Now I'd swear it doesn't lock at all. I have literally no suspension travel right now, so when I pull into my girlfriends apartment complex, I get one rear wheel up in the air. I can rev up the engine, and that one rear wheel will just keep spinning.

 

Thats horrible for the diff. The house I use to rent had a bad driveway angle and mine could pull up...after the first time I realized it, so I entered with enough inertia to not spin like that.

 

I mean, I don't sit there and burn it all day. Just for like a split second. But shouldn't the diff lock up?

 

If your in a pinch, you should just take the open diffs you have, clean them up (clean metal = good strong welds) and find someone who is willing and can actually weld decently.
As long as your fine with tires getting eaten up a bit quicker, chirping tires in lots and slow turns, and not being a jackass in the rain you should be fine.

 

Yeah, that's what I plan to do for this event, then, since I'll have the LSD out, I'll try to rebuild it.