VLSD the myth...

"The viscous coupling unit, is a self-contained unit inside the diff housing. This would suggest that changing the diff fluid only affects the pinion and diff gears, not the coupling unit, but I can't tell for sure."

"The oem VLSD deficiency becomes exponentially anemic with the ever thirst for bigger and stickier tires. The 'limited slip' capability becomes less affective due to the light duty nature of these VLSDs. The non-serviceable viscous fluid in the core also deteriates with abuse over time. Unlike clutch-packed LSD, no amount of differential fluid change or additives will have any impact."

Bottom line we are f#cked 🙄 Nothing you can do about it unless you got R8000 spare 😀 to buy a clutch type LSD

I know a few guys who have changed their diff oil and put the normal EP90 gear oil and their diff dont work no more. They worked before after the oil change - nothing.

I had to take mine back to the agents to change the diff oil because you cant buy it anywhere.

Ummm the oil should have no effect on the VLSD though if its the correct grade GLI-5 or something...

That viscous coupling is a sealed of unit so no oil change can affect it.

That is what the myth is, I read up this morning on how to service the damn thing since mine is doing what everyone else is doing, not-working so good after 15 years. And to my shock one can't do anything with it... Yeah you can change oil but it won't help it lock better.

I'd really like it to lock more, on Saturday I destroyed one tire in the drifting the other is smooth but should wear the same as the other.

Surely even if it does lock properly inside tire will be less worn than the outside, seeing that there is more weight on your outside tire.

Just my thought. When doing oval track racing that was the case.

Well I know Trans-Axle here in DBN can service and repair them, they did one already. They fixed a mate of mines, whose didnt work after changing the oil, they said WRONG OIL.

Vlade wrote:

Saturday I destroyed one tire in the drifting the other is smooth but should wear the same as the other.

Story of my life! I've read somewhere that and RWD car naturally puts more power on the rear left (or was it right) and you cant do much about it, even a solid axle, the torqing of the motor will still put alot of "weight" on one side, like in this pic...

I just end up rotating the "good" tyre to the bad side and pop on another drift tyre (I got 4 identical spare rims)

I've read somewhere that and RWD car naturally puts more power on the rear left (or was it right) and you cant do much about it

that is true because one of the drive shafts / side shafts are longer than the other. That is also why when you light up your wheels from standstill the rear always go towards the left.

Gary57 wrote:

I've read somewhere that and RWD car naturally puts more power on the rear left (or was it right) and you cant do much about it

that is true because one of the drive shafts / side shafts are longer than the other. That is also why when you light up your wheels from standstill the rear always go towards the left.

kak man. my car pulls to the left when I launch coz of my mega power 😛

But does any1 know what LSD a S14 has?! I'm guessing it's close to the S13

haha - you noobs are funny!!!

the diffs are exactly the same. they're both R200 diffs, and i'm assuming from that fact, that they have the same internals!

as for the side-shafts being different lengths. i think in our cars, its such a minimal difference that unless you're running huge power, it wont be noticeable. i mean its not like my old FWD, where the one side shaft was twice as long as the other!!! talk about torque steer!

as for that pic of the drag car, yes the car does like to put more weight onto one side of the car, its even written in the equation of torque. but i think with that pic, most of the "twist" is in the body. thats why the front of the car is so out of shape compared with the rear!

as for our diffs not being affected by the type of oil, i dont think thats right! with the incorrect oil type your LSD will not work at all! and i dont see a sealed unit on that diff??? the housing of the LSD unit are open on the sides, and there are no seals on it. nothing to indicate that it is sealed!

then gary - i've used AGIP LSX diff oil with great results on my diff. i dont see the need to go to nissan for a shafting. try it out sometime and let me know what you think! its about 105-00 per litre, and only is available in litre bottles!

Part #16 on that diagram is sealed... they say it contains some sort of silicon thing...

As for the wearing of the one tire more than the other... It would just have been nice if they wear out more evenly, now its like 70/30 effect other tire is still usable, other is f#cked... at least I'm not a dorifto tire destroyer virgin no more 😂

Vlade wrote:

Part #16 on that diagram is sealed... they say it contains some sort of silicon thing...

As for the wearing of the one tire more than the other... It would just have been nice if they wear out more evenly, now its like 70/30 effect other tire is still usable, other is f#cked... at least I'm not a dorifto tire destroyer virgin no more 😂

maybe you need to shim that diff YO!

The side shafts are a good 50mm longer which does make a difference.

Agents charge R175.00/Lt and it took 3. How often do you think you should change the diff oil??

Yeah speaking of shimming the diff - found a cool writeup on NZD1 pay them a visit... here is a taste

http://www.d1nz.com/forum/viewtopic.php?t=9610

If you shim the diff it will whine!!!

if you look nicely through those pics... try to spot the sealed piece.

if you spot it...

post it here to win your prize!!! 😉

Eish... He's holding it in his hand babba

doesnt look very sealed to me pappa!

I think the car twisting like that has more to do with the fact that the motor is turning in the one direction than anything to do with the lenth of the side shafts.

Picture twisting something like an ice cream stick with your hands. If you hold the one side firm enough and apply some twisting force to it then the side that's less firm (The front - cause the wheels are up in the air) will start twisting in the direction of the force being applied.

I've seen quite a few S15 helical diffs for sale and they aren't that expensive. Not quite as effective as a clutch type but much more streetable and much better than the VLSD.

veecee wrote:

doesnt look very sealed to me pappa!

That thing is sealed dude... Of course it must have place for the side shaft.

Check out this for a better explication of how it works...

http://auto.howstuffworks.com/differential5.htm

"A simple experiment with an egg will help explain the behavior of the viscous coupling. If you set an egg on the kitchen table, the shell and the yolk are both stationary. If you suddenly spin the egg, the shell will be moving at a faster speed than the yolk for a second, but the yolk will quickly catch up. To prove that the yolk is spinning, once you have the egg spinning quickly stop it and then let go -- the egg will start to spin again (unless it is hard boiled). In this experiment, we used the friction between the shell and the yolk to apply force to the yolk, speeding it up. When we stopped the shell, that friction -- between the still-moving yolk and the shell -- applied force to the shell, causing it to speed up. In a viscous coupling, the force is applied between the fluid and the sets of plates in the same way as between the yolk and the shell."

from that link vlade posted.

but i have a VLSD in the rear of my car, not an egg. and its filled with LSX - an oil that has properties that make the viscous LSD work, unlike some other oils.

also - i think you're maybe confusing the part in his has hand with the diff housing itself. the entire diff housing is a sealed unit!???!