If it is good it will slip but very slowly and with a lot of resistance. Remember it's a LSD not a locked differential.
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Originally posted by z122643 View PostNow that I've got someone's attention. Anyone know how to get the pinion out?
Originally posted by whysimonWTF is hello Kitty (I'm 28 with no kids and I don't have cable)
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A diff with old pinion bearings and races and Old LSD internals is NOT rebuilt
BMW's kill the pinion bearings and races first; no amount of paint or clean up will "FIX" this.
to replace them with NEW is the proper procedure; a NEW crush washer is needed to set the drag load.
Originally posted by nando View PostI could, but BMW used a VC back there for a reason - to some extent a clutch diff still needs one axle to have a load on it. a VC doesn't.
a Clutch type LSD unit locks because the basket of spider gears in the middle wants to expand when One wheel is significantly different than the other; One wheel can be airborne and unloaded; it will Lock if internally proper.
A viscous LSD uses HEAT from the wheel speed difference to lock up plates in fluid; its a REACTIONARY item that locks AFTER enough heat is put into it.OBD1 M54/M52TU swap as a M50b25
Z4 non powered steering rack fits e30
Euro e46 2005/6 320d 6mt gearbox into E30 with M20 hardy and beck 1985 327s engine
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Originally posted by Wanganstyle View PostA diff with old pinion bearings and races and Old LSD internals is NOT rebuilt
BMW's kill the pinion bearings and races first; no amount of paint or clean up will "FIX" this.
to replace them with NEW is the proper procedure; a NEW crush washer is needed to set the drag load.
a Clutch type LSD unit locks because the basket of spider gears in the middle wants to expand when One wheel is significantly different than the other; One wheel can be airborne and unloaded; it will Lock if internally proper.
A viscous LSD uses HEAT from the wheel speed difference to lock up plates in fluid; its a REACTIONARY item that locks AFTER enough heat is put into it.Last edited by TehRaydarlover; 11-20-2013, 04:22 PM.Your signature picture has been removed since it contained the Photobucket "upgrade your account" image.
Build Thread
Rear Diff Rebuild
Rebuildable Viscous Coupling
Transfer Case Rebuild
"Life is simpler with 12 valves"
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Originally posted by TehRaydarlover View PostA viscous lsd uses a shear thickening silicone fluid not heat, hence VISCOUS lsd. The fluid increases viscosity with shear rate. The diff will lock after it reaches a high enough shear rate.
Originally posted by TehRaydarlover View PostA viscous lsd uses a shear thickening silicone fluid not heat, hence VISCOUS lsd. The fluid increases viscosity with shear rate. The diff will lock after it reaches a high enough shear rate.
We are both saying the same thing.
Viscous silicone fluid still needs heat to work.
Heat comes from wheel speed differences
Sent from my SAMSUNG-SGH-I337 using TapatalkOBD1 M54/M52TU swap as a M50b25
Z4 non powered steering rack fits e30
Euro e46 2005/6 320d 6mt gearbox into E30 with M20 hardy and beck 1985 327s engine
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Originally posted by Wanganstyle View PostWe are both saying the same thing.
Viscous silicone fluid still needs heat to work.
Heat comes from wheel speed differences
Sent from my SAMSUNG-SGH-I337 using TapatalkYour signature picture has been removed since it contained the Photobucket "upgrade your account" image.
Build Thread
Rear Diff Rebuild
Rebuildable Viscous Coupling
Transfer Case Rebuild
"Life is simpler with 12 valves"
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Originally posted by TehRaydarlover View PostNo heat has nothing to do with it. Its an unwanted byproduct.
If it was not heat expanding the silicon viscous fluid then how else would it lock up? MAGIC???
The viscous unit is a sealed capsule with fluid and discs inside. The silicon fluid gets hot and expands: locking happens then
Sent from my SAMSUNG-SGH-I337 using TapatalkOBD1 M54/M52TU swap as a M50b25
Z4 non powered steering rack fits e30
Euro e46 2005/6 320d 6mt gearbox into E30 with M20 hardy and beck 1985 327s engine
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Originally posted by nando View Postactually I agree with him - you have it wrong. viscosity increases because of shear, not because of heat. heat is just a byproduct.
Sent from my SAMSUNG-SGH-I337 using TapatalkOBD1 M54/M52TU swap as a M50b25
Z4 non powered steering rack fits e30
Euro e46 2005/6 320d 6mt gearbox into E30 with M20 hardy and beck 1985 327s engine
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Originally posted by Wanganstyle View PostGoogle search how a viscous lsd works: Suabru and many others use them. Bmw uses a GKN VISCO-LOK viscous on e46m3 and e60 m5; im quite familiar with it.
If it was not heat expanding the silicon viscous fluid then how else would it lock up? MAGIC???
The viscous unit is a sealed capsule with fluid and discs inside. The silicon fluid gets hot and expands: locking happens then
Sent from my SAMSUNG-SGH-I337 using Tapatalk
Originally posted by nando View Postactually I agree with him - you have it wrong. viscosity increases because of shear, not because of heat. heat is just a byproduct.Your signature picture has been removed since it contained the Photobucket "upgrade your account" image.
Build Thread
Rear Diff Rebuild
Rebuildable Viscous Coupling
Transfer Case Rebuild
"Life is simpler with 12 valves"
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Originally posted by TehRaydarlover View Postlol its a material property. Simple example: have you ever played with cornstarch and water??? It gets hard when you try to stir it. It does not get hot... a lsd is fundamentally the same thing
^this
Realistically the plates inside vlsd will expand with heat.
This is a math bee beteeen tmi school kids
Sent from my SAMSUNG-SGH-I337 using TapatalkOBD1 M54/M52TU swap as a M50b25
Z4 non powered steering rack fits e30
Euro e46 2005/6 320d 6mt gearbox into E30 with M20 hardy and beck 1985 327s engine
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Originally posted by Wanganstyle View PostChicken egg equation
Realistically the plates inside vlsd will expand with heat.
This is a math bee beteeen tmi school kids
Sent from my SAMSUNG-SGH-I337 using Tapatalk
lol, yep. I am a senior ME student, I've done experiments with Newtonian and non-Newtonian fluids, and plotted the shear rate vs viscosity. The fluid in the vlsd is a silicone based dilatant fluid. Do some searches about vlsd on pages other than Wikipedia, you'll see what I'm trying to say.Your signature picture has been removed since it contained the Photobucket "upgrade your account" image.
Build Thread
Rear Diff Rebuild
Rebuildable Viscous Coupling
Transfer Case Rebuild
"Life is simpler with 12 valves"
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I've done the research and the experiments to prove it. Evidently you haven't.Your signature picture has been removed since it contained the Photobucket "upgrade your account" image.
Build Thread
Rear Diff Rebuild
Rebuildable Viscous Coupling
Transfer Case Rebuild
"Life is simpler with 12 valves"
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