Gtr Clsd Diff's Worth The Rebuild?

[Cubes]

Hey ppls,

I bought a gtr style center for my R32 a little while back s/h from a wrecker.

Dropped it in; was a tad loose so I had it shimmed up.

Dropped it back in the car still wasn't 100% but noticeably better especially in the wet.

Recently the car made 268rwkw and now after a few accelerations its now all of a sudden gone single wheeling when rolling on the throttle from 80km/h in fourth.

So.... Are they worth while rebuilding and setting it up real tight or should I cut my losses and outlay 1k :S for an aftermarket?

I remember R31Nismoid had his CLSD rebuild and apparently dropped more clutches in it? Wouldn't know exactly what they did?

If they used genuine nissan clutches or had them made up custom?

[turboedsloth]

you could always replace all the frictions with new ones and put new shims an that in there. just reading my manual theres 2 different thicknesses you can get LSD friction plate

Thickness mm (in) Part number

1.75 (0.0689) 38432 N9000

1.85 (0.0728) 38432 N9001

perhaps rip the diff out of your car, if ya know wat your doin pull her apart and check the condition of the plate and take a rough measurement of the plates, check for wear inside the housing an go from there

those part numbers are from nissan itself aswell

[Cubes]

Thanks bud.

Do the Nissan CLSD's only tend to break if you have them open wheeling? Never break just from power/torque so to speak?

What do you GTR blokes do? Aftermarket or the stocker is good enough and as a result rebuild?

[turboedsloth]

i havent had any experience with gtr lsds not many of them in town mainly just normal car lsds and bomadores, most just tend to wear out if they get given a hard time, if you drag race or do burnouts etc etc they wear out quicker than normal.

[Cubes]

ahh ok.. I've only had this diff in the car a month. Had it pulled apart inspected and shimmed; was told it was in perfect nick. Still open wheeled in first and second, only had it twin up in second once or twice, third was good mose of the time but occasionally would buzz one wheel.

Told the bloke who did the work; he said to drive it around and enjoy the car a little more and drop it in a little later.

So now its 10000% stuffed from taking it for a drive after it was tuned. No burnouts no drags etc. Just rolling on the throttle.

I've been told the GTR clsd's are pretty weak if you let them open wheel. Apparently they rip the lugs off the friction/clutch plates or something.

[Duncan]

gtr diff is fine, its a 2 way mechanical diff centre.

Can be shimmed up to whatever tightness you want. we run standard diff centre in the race cars

[Cubes]

Good stuff Duncan. Just what I want to hear.

What breakaway do you run in the racecar?

[Duncan]

we told the guy in the shop:

"we want to hear it go clunk when we turn corners in the car park"

and whatever they did is perfect on the track

but I guess the point is there's nothing wrong with the standard centre, no point spending $1k on a new centre for them

[Cubes]

Stumbled upon this...

Nismo R200 CLSD part break down and numbers

http://translate.google.com/translate?hl=e...ficial%26sa%3DN

and for the Nismo Disc kit part numbers!!

45 ft/lbs - 3843S-RS650

75 ft/lbs - 3843S-RS651

Apparently the nismo friction discs/plates are smooth where as the street friction discs/plates are grooved.

The reason for smooth vs grooved?????

The grooved discs/plates hold more oil offering a smoother chatter free operation?

Or do they provide increased friction as the std diffs run less friction plates?

The nismo smooth plates are apparently cheaper than the nissan grooved plates.

----

The Nismo 45 ft-lbs plate arrangement

Spring Plate

Spring Disc

Friction Plate

Friction Disc

Friction Plate

Friction Disc

The Nismo 75 ft-lbs plate arrangement is strange. Is there any problem with the following arrangement?

Essentially they replace a friction plate with a spring disc.

Seems a little strange; I guess its an easy way to increase breakaway without shimming.

Spring Plate

Spring Disc

Spring Plate

Friction Disc

Friction Plate

Friction Disc

I'll probably do the following for both sides.

Remove the spacer

Spring Plate (reuse old)

Spring Disc (reuse old - hopefully its tabs are intact)

Friction Plate (reuse old)

Friction Disc (new - tabs are most likely smashed)

Friction Plate (reuse old)

Friction Disc (new - tabs are most likely smashed)

That gives me one additional friction disk that holds on to the axle distributing the power over 3 discs vs 2 for each axle.

As there's more discs it also provides increased friction (locking action) once your on the throttle and the pressure rings have spread.

So tighter stronger diff.

I'll most likely buy the 2 slightly thicker 1.85mm (vs 1.75mm) for each side as they are cheaper and will help reduce the amount I have to shim the diff up.

Unsure if there's any problem shimming up ~1.5mm each side; maybe machine down the original spacer; I will have to speak to the diff man!

Get it up to ~75-80 ft-lbs breakaway and it should hold on quite nicely.

Thinking back I know when the diff got smashed.

Powering on in third gear ~4500rpm it starts to loose a little traction, arse end sits down grabbed really hard nose lifted, one wheel broke traction a little then grabbed hard again. Then after that it was a constant single left wheeler.

[Cubes]

The Nissan friction discs and plates are available but at a cost of ~$120 each. :S

I will price up the nismo clutch pack tomorrow. Fingers crossed its ~$300 odd like some one suggested in another thread.

[Beer Baron]

I priced up the nismo upgrade packs. both kits are the same price and cost $290 delivered give or take a few bucks and currently available from nismo japan.

[Cubes]

Champ!

I've checked out the nismo online shop but its not in english. :S

Where did you price them up from? Aus Nissan or Nismo Japan?

[Beer Baron]

nismo japan. through my friends company in tokyo.

[9krpm]

I'll be interest in a set just in case of rainy day

Any chance of group buy or something like that Beer?

How soon can you get that in Beer?

Cubes, where will you be taking ur diff to for rebuild in SA?

[Beer Baron]

yeah I don't mind getting a few sets for people. takes approx 2 weeks to be delivered. I know I regret not getting some nismo parts before they were discontinued so I guess with the nismo clutch pack upgrade couldn't hurt to have one spare.

[Cubes]

I'll be interest in a set just in case of rainy day

Any chance of group buy or something like that Beer?

How soon can you get that in Beer?

Cubes, where will you be taking ur diff to for rebuild in SA?

In the past I've had Boss Automotive shim the diff up. It was supposed to take a day which stretched out to 5days and then I get it and its still quite loose.

I've spoken to Shaun at Boostworx so I'll get him to do the work.

[turboedsloth]

5 days to do a diff? thats a bit slack unless they were busy, there not that hard to do

[Cubes]

Yeah on the 5th day friday I turned up at 11am and they still hadn't done anything. By 2pm I got a call saying it was done.

They obviously just kept putting it off and off. So I'll just get Boostworx to do the work as he knew more about what's available for them than boss did (having done the nismo upgrades kits before); should have gone there from the start.

So now to sweet talk the missus in to letting me spend $300 + labour on getting the diff repaired lol.

[turboedsloth]

sweet talking + flowers + a box of chocolates= a rebuilt diff. good luck

[T04GTR]

yeah thats goood. i threw out all my little nismo bags with the part numbers.

the main advantage is the factory setup only has 1 friction disc conecting the case to the axle. so the problem is not it being to loose. but it actually stripping the said single friction disc.

so the "upgrade" adds an aditional 2 driven discs on each side. so going fron 2 to 6 driven discs makes them much more durable.

putting in these upgrade discs is a piece of cake. but YOU HAVE TO THROW AWAY THE THICK SPACER at the end of each side. the extra plates make up the diferance.

so putting this set in your standard diff makes it a "nismo 2 way" the nismo one you buy complete it just this.