L.s.d

30psi · #1 06-12-2006, 08:31

You need the S13 diff, 2 left hand silvia shafts and one S13 inner 6 bolt CV joint housing and related driver side inner shaft....

Fully strip the S13 LSD, and removing the ring gear from it. Throw ring gear, case, shims etc in the bin

Then strip the S12 diff, and rebuild it with the S13 inner diff unit. ie bolt the S12 ring gear to the S13 unit.

Then the shafts need some work.

You use the short S12 shaft on the driver side with the S13 inner joint/inner

On the short side (passenger side) you can use the standard short shaft but you have to remachine so its like the S13 shaft.

Sharas · #2 06-12-2006, 12:36

Cant the left output shaft be used from the s13/s14 diff?

30psi · #3 06-12-2006, 12:54

No because it makes the shaft too long, and it full compresses up the cv joints and it even pushes the swing arm outwards

Sharas · #4 06-12-2006, 12:59

Quote:

Originally Posted by 30psi

No because it makes the shaft too long, and it full compresses up the cv joints and it even pushes the swing arm outwards

Got that, well i think that wount be a problem (first i need to make the car runing again

, now thats bit of a problem)

124 · #5 13-02-2007, 16:41

I thought I might add that in the Vlsd the V stands for viscous. Viscous diffs are basically a single open diff with some friction plates that heat up a fluid which then engages the other half but only if it gets hot enough. This system works well if used for an extended period of time or if warmed up before use (eg small burnout) but generally, when driving around normally it wont do anything if you try to drift straight up. So it is a cheap alternative to a proper lsd but its like anything you get what you pay for.

wacomuk · #6 13-02-2007, 18:27

i cant see how this set up would be reliable as you are using 2 different types of joint on the same drive shaft. CV which isn't supposed to move and a lobro joint which is designed to move. i cant see the CV joint lasting very long

30psi · #7 13-02-2007, 23:07

Quote:

Originally Posted by wacomuk

i cant see how this set up would be reliable as you are using 2 different types of joint on the same drive shaft. CV which isn't supposed to move and a lobro joint which is designed to move. i cant see the CV joint lasting very long

They use the same type of CV joints, which is 3 spindle spider assembly type. Can't see how reliability is an issue, because the joints are working exactly as they were originally designed

Draconis · #8 14-02-2007, 04:46

This is from Club S12 where GerryB did a short write up on what it took to get his S13 VLSD to work in the S12... which I'll be doing in the next 6 months.

I have an s13 VLSD centre in my longnose s12 type 4.11 R200. It bolted in fine after I swapped the s12 crownwheel on to it.

BUT for the RHS drive shaft I had to take the inner CV off and swap the s13 inner CV on to it and run the s13 RHS input shaft in the diff to operate the Viscous centre. Also had to cut off about 8mm off the end of the spline that goes into the diff of the LHS s12 driveshaft, so it didn't fowl on the viscous coupling.

After these mods was just a bolt up.

(I got the VLSD reshimmed also before fitting it, (extra shims) to make it real tight.)

http://www.club-s12.org/forums/index...howtopic=16318

30psi · #9 13-02-2007, 23:11

Quote:

Originally Posted by 124

I thought I might add that in the Vlsd the V stands for viscous. Viscous diffs are basically a single open diff with some friction plates that heat up a fluid which then engages the other half but only if it gets hot enough. This system works well if used for an extended period of time or if warmed up before use (eg small burnout) but generally, when driving around normally it wont do anything if you try to drift straight up. So it is a cheap alternative to a proper lsd but its like anything you get what you pay for.

Your mistaken I'm afraid.

They don't have that effect, in fact the opposite effect. Go and jack up a VLSD equipped car and you will struggle to turn the wheel on its own.

If someone was to pratt around trying to drift all day then the viscous unit warms up. Its an energy absorber. Once its hot a worn unit won't have much resistance anymore. Just like butter.

Its a damn good modification. Its not geared towards drifting. If you want drift then spend £700 on a Nismo GT pro diff.

124 · #10 13-02-2007, 23:54

I am not saying its a bad thing I have driven both viscous lsd and mechanical lsd i was a bit dissapointed by the vlsd. You do need a good diff to launch your car in a straight line as well as to go round corners so its not just drifters that need good diffs. However in my book(student)a cheap and easy mod is a good mod.