My viscous limited slip (1991!) is still a limited slip diff! My current set up is...

Greddy kit
10* BTDC timing
full 2.5" turbo back

everything else is stock (except head gasket and studs).

Who wants to start a pool to see how long it takes my diff to toast?

Oh, we can also get one going for my $100 Mazda Value Line 1.6 clutch because I'm sure that it's days are numbered too.

 

You'd be surprised. My 91's original clutch and lsd are holding up fine at 7psi.

 

Same here exept I was at 8psi for 5k miles before my cluth started to go. My LSD is still fine.

 

how much power can these take...with mechanical empathy. I won't ever do a burn-out, or slam gears. Granny shift-a fo life, ya hurd!!!

 

im going to do the same.i have a 90 with a vlsd.and i tell myself im not going to do burnouts maybee on dirt and in the rain.

 

I don't burnout either, waste of rubber IMO. I'm all about the grip!

 

6-10psi for about 15k now on the vlsd, plenty of Autox's and 2 trackdays. But I don't abuse it.

 

I believe fm proved witht there orginal track dog car at 240 or so whp thta the 1.6 diff suffers failure mostly from abuse and jackassery than power i have seen o solo miata that the temps in our little diffs get quite hot and htis cuases the dif oi to thin and heat cycles the gears making them brittle over time the bottom line is if you have traction and optimal airflow to keep the dif cooler or a dif cooleer setup then it should last quite awhile. just my 2 cents.

 

Suggestions are always nice in terms of longevity. THx!

 

so whats a good diff oil..?befor i go

 

I use lucas in my torsen now.

I blew my 1.6 diff in my stock 91 a year ago, no real jackassery just commuting and a drift event...

 

I hate that crap I dont know how well it works in diffs but it made my motor tick like a bitch

 

Any synthetic 75W90 diff fluid should work fine. I only say synth b/c of it's heat resistant properties compared to dino, not trying to start a debate as to which is better.

FWIW, my diff was fine at 8-9psi for over a year...then I turned the boost up and bye-bye. Also, it didn't blow during a launch or something stupid, it died in 4th gear at higher rpm while the clutch was already engaged and I was accelerating. YMMV.

 

whats good stuff for tranny gear oil.any name brand.also how much fluid for the rear and tranny.

 

redline or royal purple rp is 17 dollars a liter for dif fluid and redline will run you 10 bucks a liter you will need 2-3 of each.

 

If you drive hard and the rear end sees excessive heat like on a race track, get the best money can buy for lube. The rear end gears need to be as slick as possible, unlike the trans.