vlsd rebuild

[turoki]

hi i im in the process of buying a super hicas vlsd for my s13 the vlsd has more than a 1k on it it seems fine but my question is in the feature can it be rebuilt? and if so for how much roughly? thank you

[leonelrr]

Yes i believe you can rebuild things things.. I don't know how much it would cost thg..

What car does it comes from?

[scooz14]

i dont think you can rebuild the viscous part. it is like a liquid connection and when the fluid thins out, it does not work as an lsd

[turoki]

Yes i believe you can rebuild things things.. I don't know how much it would cost thg..

What car does it comes from?

it was in a 240sx with hicas.

[turoki]

i dont think you can rebuild the viscous part. it is like a liquid connection and when the fluid thins out, it does not work as an lsd

.so theres no way to replace it then? are they like throw away diffs? please excuse my ignorance.

[turoki]

bump any one know

[spank044]

You can rebuild them, but you would need to find a viscous coupling.

[scooz14]

but the viscous coupling is not rebuildable

[turoki]

You can rebuild them, but you would need to find a viscous coupling.

you think o would have to go threw Nissan for that part or would a local diff shop have those parts?

[spank044]

Scooz, that is why he would have to find a new one, then rebuild the diff. OP I think you could get one at either. You just have to call and talk to the parts department. Make sure you talk to an experienced parts person though.

[Beanstalk]

I used to work at dana axle and guys argued about this topic all the time point is yes you can rebuild them but there are tricks that you can do to bring life back into your vlsd like friction inhibitor that big trucks use the oil in the diff should be changed and i hear you can also hose the IU down in brake parts cleaner and let it dry out then re-oil and acts as good as new

[turoki]

I used to work at dana axle and guys argued about this topic all the time point is yes you can rebuild them but there are tricks that you can do to bring life back into your vlsd like friction inhibitor that big trucks use the oil in the diff should be changed and i hear you can also hose the IU down in brake parts cleaner and let it dry out then re-oil and acts as good as new

thats really interesting i wish there was more stuff out there on this topic i havent seen any write up or pics. anyone know any where to get some info on how to rebuild or like you said Beanstalk ''bring back to life''. there rear end i can get is a out of a super hicas s13 with more than 100k on it i can get it for 150 you guys think its worth it?

[Beanstalk]

Yeah in my humble thoughts any vlsd under 200 bucks is worth it unless you have to buy axles and other stuff to make it work....and in all reality the ka don`t have alot of hp so if it is toast than the previous owner would have had to tear the crap out of it (never change the oil )cuz its built well from the factory

[turoki]

Yeah in my humble thoughts any vlsd under 200 bucks is worth it unless you have to buy axles and other stuff to make it work....and in all reality the ka don`t have alot of hp so if it is toast than the previous owner would have had to tear the crap out of it (never change the oil )cuz its built well from the factory

what do you mean never change the oil? are you talking about the gear oil?

[the converted]

You can't rebuild a viscous limited slip. The fluid in it is different than the gear oil so you can change it as much as you want, with whatever fluid you want. I think beanstalk is talking about clutch based limited slips.

[spank044]

No, I think he his talking about cleaning out the viscous coupling which has an extremely thick silicone based fluid inside. I don't know if you can actually take a nissan viscous coupling apart though. If you can then this will need a write for sure if it works.

All in all, OP I am sure your vlsd is fine, so just change the diff fluid with some 80-90w (that's what I use) and be happy.

[turoki]

so do you guys defiantly think i should buy the diff the guy wants 100 for it now.?

[the converted]

It's definitely an improvement. There really aren't any wear components to it so you shouldn't have any issues with it.

[Beanstalk]

Yes i am talking about the clutch based but i dont have personal exp. with vlsd rebuilds i will have to talk to a few buds of mine and see what they have to add and relay it or tear mine down and tinker til i figure it out

[spank044]

OP, buy it.

A vlsd has a sealed viscous coupling which has 2 or 3 slotted discs submerged in a thick silicone based fluid, when the disc start to slip under hard acceleration then the fluid gets hot and hydraulically binds the discs together to make both output shafts spin at equal rates.

[turoki]

Yes i am talking about the clutch based but i dont have personal exp. with vlsd rebuilds i will have to talk to a few buds of mine and see what they have to add and relay it or tear mine down and tinker til i figure it out

if you can let me know what they say thanks.

OP, buy it.

A vlsd has a sealed viscous coupling which has 2 or 3 slotted discs submerged in a thick silicone based fluid, when the disc start to slip under hard acceleration then the fluid gets hot and hydraulically binds the discs together to make both output shafts spin at equal rates.

how much of a difference do you think it will make. i have a open diff now if i throw the vlsd will there be that much of a difference?

i really appreciate all of your guy's help thank you.

[spooled240]

hell yes the vlsd will be a night/day difference compared to the open diff. No more one wheel burnouts on hard launches or hard cornering and a lot more added traction in rain/snow/mud.

I heard that the vlsd unit is not rebuildable, or it is not designed to be rebuilt as the thick silicone-based fluid in the viscous unit is totally sealed from the gear oil you put into it. So changing the gear oil will help your vlsd last longer as far as lubrication and heat(same reason you change the oil in your car, replacing worn-out oil) but it won't rejuvenate the viscous unit persay.

There is, however a way to have your worn out vlsd to lock much better. You can shim your vlsd and depending on how thick your shims are, you can have your lsd lock like a 1.5way or a 2 way(welded) differential. A shim from nissan is around 10 bucks but you will have to open your differential up a little bit.

there is a good write-up on zilvia:http://zilvia.net/f/s-chassis/....html

or just search "shim vlsd" on google for some other results

[turoki]

hell yes the vlsd will be a night/day difference compared to the open diff. No more one wheel burnouts on hard launches or hard cornering and a lot more added traction in rain/snow/mud.

I heard that the vlsd unit is not rebuildable, or it is not designed to be rebuilt as the thick silicone-based fluid in the viscous unit is totally sealed from the gear oil you put into it. So changing the gear oil will help your vlsd last longer as far as lubrication and heat(same reason you change the oil in your car, replacing worn-out oil) but it won't rejuvenate the viscous unit persay.

There is, however a way to have your worn out vlsd to lock much better. You can shim your vlsd and depending on how thick your shims are, you can have your lsd lock like a 1.5way or a 2 way(welded) differential. A shim from nissan is around 10 bucks but you will have to open your differential up a little bit.

there is a good write-up on zilvia:http://zilvia.net/f/s-chassis/....html

or just search "shim vlsd" on google for some other results

You guys are Fu@#ing awesome im definitely getting it then im also going to look into getting the viscous unit and ill post the cost. its good to know that it will make a big difference. is there a way to check if the discs are shoot or if the silicone is all gone ?

[jeff420]

yeah snag that for 100. i sell vlsd's locally for 250. i wouldnt worry about the mileage too much. i had a j30 vlsd in my 240 with almost 200k miles on it and it always locked just fine. now someone else is enjoying it out there somewhere. cant wait to install my new vlsd, its pretty. painted it orange. couldnt find hot pink paint, lol.

[turoki]

yeah snag that for 100. i sell vlsd's locally for 250. i wouldnt worry about the mileage too much. i had a j30 vlsd in my 240 with almost 200k miles on it and it always locked just fine. now someone else is enjoying it out there somewhere. cant wait to install my new vlsd, its pretty. painted it orange. couldnt find hot pink paint, lol.

hot pink lol. im sure youll get a lot of attention with hot pink but thats cool i was just going to paint it black but i think ill look for a better color. yeah i was worried about the millage at first but im starting to worry less about it. i think im going to shim it before i put it in my car though lots of people say they like them shimmed better.

[spooled240]

I wouldn't worry about the mileage or if the silicone fluid leaked out, i've never heard of anything happening like that. Just make sure both axles spin freely and they spin in the same direction.

It's been snowing at my house and i took my car out for a joy ride..and the vlsd will get you out of some sticky situations

[turoki]

I wouldn't worry about the mileage or if the silicone fluid leaked out, i've never heard of anything happening like that. Just make sure both axles spin freely and they spin in the same direction.

It's been snowing at my house and i took my car out for a joy ride..and the vlsd will get you out of some sticky situations

sounds great i was really worried that i might have to do a full rebuild on the vlsd but i sounds that i might get to have a bit of fun with it right away which is good ill be sure to check the axles like you said though thanks. damn it was snowing up there i didn't think you guys got snow being the high desert and all shows how much i know lol

[spooled240]

i just noticed you are in socal =] we are at 2700-3000 feet so we got like a foot of snow!! I actually have a super hicas vlsd out of an s13 in my s14 right now, and i love it. I wanna shim it so it will lock more like a 1.5 tho.

[turoki]

i just noticed you are in socal =] we are at 2700-3000 feet so we got like a foot of snow!! I actually have a super hicas vlsd out of an s13 in my s14 right now, and i love it. I wanna shim it so it will lock more like a 1.5 tho.

thats crazy i have never lived in place were it snowed. yeah the vlsd that im getting is a super hicas too i hope it fits because my car is auto and it was in a manual s13. i heard somewhere that i might have to replace the drive shaft but then i heard thats not true we'll see i guess.

[spooled240]

you'll probably be fine, the driveshaft should have about an inch of play sliding in/out of the transmission so that should compensate for any differences between a manual/auto driveshaft. But like you said, we'll see lol.