WHAT REAR DIFF TO USE?

[SR20DET180SX]

I have a s13 with an SR. I KNOW THAT I CURRENTLY HAVE AN OPEN DIFF. WHAT OPTIONS DO I HAVE TO CHANGE THIS AND WHERE WOULD I SOURCE THESE PARTS? whats the difference with a` 1.5 lsd and a 2 way lsd. ????

[mallbor240SR]

j30 lsd works fine for me, u need to get another driveshaft tho, do a search for lsd swap

[2j'd]

j30,z32 n/a diffs should bolt right up and q45 but need different axles not sure wich ones though

[DuckyD]

whats the difference with a` 1.5 lsd and a 2 way lsd. ????

It has to do with how the diff "locks" under acceleration and braking.

A 2-way LSD will "lock" for both accelerating and slowing down, great for drifting but can cause some funny handling otherwise.
A 1.5-way LSD will "lock" on acceleration and partially lock under decel, this is more ideal for grip applications, where you may be decelerating under turning and don't need the rear axle fighting you.

Most clutch-type diffs are also adjustable in that you an change the configuration of the clutch-disks within the diff to affect how much % lock. 100% lock would act like a welded, 50% lock would allow some slipping, and everything in between. The Nismo diff is actually adjustable without removing the pumpkin, but this isn't available for the 240SX.

As far as prices, around here this is generally what the difs go for...
Welded $50
Viscous (from a J30 or some Z32) $100 - $300
Helical (from a S15 SpecR) $400 - $700
Clutch Type (Kaaz, Tomei, used Nismo, Cabronetic, etc) $1000ish new, $700 used

[OM3GA]

^^ Great info.

[Former_240_s14]

I run the OS Giken 1.5 way. NO diff chatter whatsoever and is very very driveable. It's a bit expensive but worth the money in my opinion. I have driven other cars with all kinds of diffs but you get what you pay for.

If you plan on running bigger wheels/tires you will want to stay way from the vlsd because you will murder it and it will become worthless.

Hope this helps.

Rubin