Just Installed VLSD....

[sohc90adel]

Just got my VLSD in this weekend. It took about 5 hours to do. We got kind of scared when we finished, i turned the wheels manually and the other wheel went the other way. Kind of weird. Then while the car was still on the jack stands i turned on the car and the wheels turned the same way(some relief but still scared). so we put the car down for the test drive. LSD is something that car should have come with what a differance. does anyone know anything about those vlsd's, why is it when i spin the wheel manually its acts like an open diff but when the car is on its definatly lsd, got burnouts to prove it.

[droptopsilvia]

thats how you tell if its LSD if it spins the opposite direction.I believe an open diff goes the same way.It has to do with the gearing.

[Altiman94]

open diff goes the opposite way or only one tire spins

[PROJECTRB240SX]

ITS CALLED ROTATION TAKES THE PATH OF LEAST RESISTENCE IF THE DRIVESHAFT IS LOCKED THE TIRES SPIN IN OPPOSITE DIRECTIONS, IF THE DRIVE SHAFT IS FREE ONE TIRE AND THE SHAFT SPINS, AND FINALLY IF THE SHAFT IS SPINNING THEN BOTH TIRES SPIN IN THE SAME DIRECTION.

[sohc90adel]

so what kind of vlsd do i have? is there a name for it?

[PROJECTRB240SX]

YEAH VLSD (VICACIOUS TYPE LIMITED SLIP DIFFERENTIAL)THERE ARE CLUTCH SYLE, HELICAL STYLE, LOCKER STYLE, CONVERSION LSD, THERE ARE OTHERS TOO.

[Nathan]

He means Viscous Limited Slip Differential It uses a fluid coupling between two plates to "lock" them together. I'd explain more but it's nap time.

[SloS13]

mine's been sitting on my back porch for 3 weeks. i gotta get around to installin that hoss

[sohc90adel]

which vsld came stock on a 240sx? or 180sx in japan?

[driftaholic]

R200 i believe

[crzycav86]

... i turned the wheels manually and the other wheel went the other way. Kind of weird. Then while the car was still on the jack stands i turned on the car and the wheels turned the same way(some relief but still scared).

I think this happened because the viscous fluid wasn't hot enough to expand in order to grab the the plates on the lsd. After you drive it around for awhile, the flud expands and starts acting the way it should..... or maybe i'm wrong.

[Onizuka]

VLSD will function exactly like a open dif until the silicon gets hot from side spinning faster than the other (friction=heat). As the silicon heats up it expands and locks the clutch plates together cause both wheels to spin at the same speed.

In a clutch-type diff, the stack of clutch plates actually touch each other, and as torque is applied, they get rammed together even harder

Helical LSD's use a sun gear attached to each driveshaft and planetary gears. When both wheels are not spining in the same direction the helical cut teeth on the gears push sideways making the two sun gear spin at roughly the same speed. These also are like open diffs when the car is suspended in air and you spin one wheel.

Im personaly going to go with a clutch type when i save up enough money.

[Holisticbeatz]

The viscous coupling has two sets of plates inside a sealed housing that is filled with a thick fluid. One set of plates is connected to each output shaft. Under normal conditions, both sets of plates and the viscous fluid spin at the same speed. When one set of wheels tries to spin faster, perhaps because it is slipping, the set of plates corresponding to those wheels spins faster than the other. The viscous fluid, stuck between the plates, tries to catch up with the faster disks, dragging the slower disks along. This transfers more torque to the slower moving wheels -- the wheels that are not slipping.

When a car is turning, the difference in speed between the wheels is not as large as when one wheel is slipping. The faster the plates are spinning relative to each other, the more torque the viscous coupling transfers. The coupling does not interfere with turns because the amount of torque transferred during a turn is so small. However, this also highlights a disadvantage of the viscous coupling: No torque transfer will occur until a wheel actually starts slipping.

quoted from Karim Nice