Shimming an R200 or J30 vlsd

[UNISA JECS]

Ring gear bolt torque specs are 130-145ft-lb

[SoSideways]

Originally Posted by s13dan

for real though anyone got them???

FSM says 130-145 ft-lbs.

You've used all your free hand outs.

Please get yourself a copy of the FSM before you approach any further.

[RUTH'LESSDET]

What size shims did use guys use because i dont want mine to act like a welded diff really but i dont want it to be weak sauce either. I was considering using a one 1.25mm shim. Any insight is appreciated

[silviaguy240]

you have to use the correct shims so the backlash is within stock spec.

edit, why not just buy a welded diff/get yours welded. this is ghetto and your old ass lsd is gonna break faster than normal.

[khoadogg]

Originally Posted by silviaguy240

you have to use the correct shims so the backlash is within stock spec.

edit, why not just buy a welded diff/get yours welded. this is ghetto and your old ass lsd is gonna break faster than normal.

does it lock just like a welded diff? I rather do this and get a 1.5 type around town than a fully locked diff.

[RUTH'LESSDET]

Originally Posted by silviaguy240

you have to use the correct shims so the backlash is within stock spec.

edit, why not just buy a welded diff/get yours welded. this is ghetto and your old ass lsd is gonna break faster than normal.

I dont want a welded diff that shit is too brut for me right now I drive my car alot now and dont feel like dealing with that crap all the time.

[redline racer510]

i say just add a 1.01 shim and you should be good even replacing the stock shim with a new one will not give you the lock up you want so just add a 1.01 and you should lock up pretty close to how a 1.5 locks up the only thing i dont know about this mod is how long you vlsd will last but from some of the people that have done this say the vlsd wont make any noises after breaking it in with a couple figure 8 patterns like some of the other members in this thread.

[Mtndrifter14]

Glad to see you guys found this useful if you have any questions feel free to pm me.

[Snoopy]

A buddy of mine did this... We had allot of noise when the clutches engaged.
We used some chevy lsd additive and it cleared it up

Any1 else had a problem with this?

[SoSideways]

Originally Posted by Snoopy

A buddy of mine did this... We had allot of noise when the clutches engaged.
We used some chevy lsd additive and it cleared it up

Any1 else had a problem with this?

When the clutches engaged?

I didn't think there were CLUTCHES in a VLSD?

[irax]

Originally Posted by SoSideways

When the clutches engaged?

I didn't think there were CLUTCHES in a VLSD?

so you're assuming he drives auto?

[SoSideways]

Originally Posted by irax

so you're assuming he drives auto?

What?

Unless he has a multiplate clutch assembly, I don't see how there could be "CLUTCHES" on a car, unless he was talking about the LSD clutches, which an VLSD do not have.

[irax]

automatics have multiple clutches, though i am not sure if the nissan 240 automatic trans is that type..

it could also be a typo

[Snoopy]

Originally Posted by SoSideways

What?

Unless he has a multiplate clutch assembly, I don't see how there could be "CLUTCHES" on a car, unless he was talking about the LSD clutches, which an VLSD do not have.

My mistake* To my understanding I thought a vlsd was a clutch type..

[SoSideways]

Originally Posted by Snoopy

My mistake* To my understanding I thought a vlsd was a clutch type..

No, if it was a clutch type people wouldn't be preloading it.

A VLSD is based on the viscous fluid dynamic to create a "drag" between the 2 halves inside the differential.

When 1 wheel starts to spin, the guts of the VLSD, more importantly the viscous fluid, will start to drag the other half along with it, creating a "differential" type effect, where both wheels are spinning.

A good example of this would be to take a glass of water, put some ice in it, and wet down the surface where the glass of water will sit on, and start spinning the glass. You should see the glass go first, then the ice will eventually start spinning along with the glass.

That motion is the same type of motion that happens inside a VLSD.

It has no clutch plates like the clutch type LSDs do.

Helical LSDs also do not have clutch plates. Helical LSDs are all gear based, no clutch plates.

[NissanTech240]

where you add shims..do you have to shim the other side also or only the one side

[smelly240]

wtf are you talking about??? read the thread mr 1 post new guy.

the shim goes between the diff head and the viscous coupler.

[NissanTech240]

Originally Posted by smelly240

wtf are you talking about??? read the thread mr 1 post new guy.

the shim goes between the diff head and the viscous coupler.

yeah i saw that but on another site they had the center section out. was just wondering

[SoSideways]

The diff came from the factory with ONE (1) shim, you either replace that one or stack on 2 littler ones to get a thicker effective height, what is so hard to understand about this?

[NissanTech240]

Originally Posted by SoSideways

The diff came from the factory with ONE (1) shim, you either replace that one or stack on 2 littler ones to get a thicker effective height, what is so hard to understand about this?

i understand it all. im not retarded. on another site the guy had the center section of the diff taken out where the spiders where showing..completely out. was just wondering..i get the fact that you dont have to

[JRas]

Originally Posted by Mtndrifter14

Once that is completed, separate the cover like so and before you put the new sealant on remember to scrap off all old sealant and I recommend using brakecleen to clean surfaces before applying sealant back on.

those two rusted holes at the top are better for removing the cover, the cover hangs over the holes a tad, so you can take a flat head screw driver and pop off the cover without damaging anything.

paper gasket ftw

[racepar1]

Originally Posted by motegineon

-Shims go up in 0.3mm increments from 0.8 to 1.49mm

38424-40F60 =0.80mm(same as in the picture)
38424-40F67 =1.01mm
38424-40F75 =1.25mm
38424-40F83 =1.49mm (the biggest)

What shim originally comes in the diff? I am thinking about doing this, but I only want to make a small difference. I figure if I replace the stock shim with one that is one or two sizes thicker it should do just what I want. Since my car is a trackday/autocross car I really don't want the diff to lock in an aggressive manner.

[SoSideways]

Originally Posted by racepar1

What shim originally comes in the diff? I am thinking about doing this, but I only want to make a small difference. I figure if I replace the stock shim with one that is one or two sizes thicker it should do just what I want. Since my car is a trackday/autocross car I really don't want the diff to lock in an aggressive manner.

You might have no choice but to open up your diff, then use a mic to see how thick it is, as I think the diffs can come from the factory with a few different thicknesses, which is why you can buy so many different thickness washers to begin with...

[motegineon]

Originally Posted by SoSideways

You might have no choice but to open up your diff, then use a mic to see how thick it is, as I think the diffs can come from the factory with a few different thicknesses, which is why you can buy so many different thickness washers to begin with...

Yea what he said

Heres what I suggest:

Being that they are only a couple dollars, order 1.01 and 1.25. Open your diff and compare the shim that is in there to the 2 you bought, and base that off which one you choose for your application, then just go return the one you didn't use.

[kalypso123]

I love this thread

[aa87]

Me and motegi did it at the same time.

Its pretty awesome, I snapped my axle boots and have a lot of play.

Don't forget to align the splines to the axles before you tighten down the phillips screws after putting in the shim, it keeps you from ahving to take everything apart.

But yeah, shim size can vary, me and motegi's had different shims from the factory (we assume), I just plopped a random old one i had in a junk vlsd i had sitting around, no problems, no whines, no issues.

I traded my welded out for that, and im a million times happier (although my welded had some backlash adjustment issues which annoyed me.)

[UNISA JECS]

AVAILABLE SIDE GEAR THRUST WASHERS

Type R200V

Thrust washer

Thickness mm (in) Part number
0.80 (0.0315) 38424 40F60
0.83 (0.0327) 38424 40F61
0.86 (0.0339) 38424 40F62
0.89 (0.0350) 38424 40F63
0.92 (0.0362) 38424 40F64
0.95 (0.0374) 38424 40F65
0.98 (0.0386) 38424 40F66
1.01 (0.0398) 38424 40F67
1.04 (0.0409) 38424 40F68
1.07 (0.0421) 38424 40F69
1.10 (0.0433) 38424 40F70
1.13 (0.0445) 38424 40F71
1.16 (0.0457) 38424 40F72
1.19 (0.0469) 38424 40F73
1.22 (0.0480) 38424 40F74
1.25 (0.0492) 38424 40F75
1.28 (0.0504) 38424 40F76
1.31 (0.0516) 38424 40F77
1.34 (0.0528) 38424 40F78
1.37 (0.0539) 38424 40F79
1.40 (0.0551) 38424 40F80
1.43 (0.0563) 38424 40F81
1.46 (0.0575) 38424 40F82

1.49 (0.0587) 38424 40F83

[UNISA JECS]

Just felt like adding some other pics I though would be nice to include on this thread:

2003 350z

[SirSilvia]

nice I can use that diagram as a general reference when putting the new shim.
I bought 38424-40F82 and 38424-40F83
I'm gonna go try the smaller one first for a while

[UNISA JECS]

Does anyone here use a micrometer to measure the old shims to determine what size shim to go with when doing this mod or is everyone doing inni minni mini mo...???