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Old 12-29-2009, 11:06 PM   #16
NOTORIOUS VR
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Quote:
Originally Posted by thinair View Post
That's a great way to kill a centre diff.
Explain how he would hurt the center diff by doing that.
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Old 12-29-2009, 11:27 PM   #17
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^^the viscous coupling gets way too hot if you put too much torque though it for too long. Overheated VC's can fail very quickly.
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Old 12-29-2009, 11:40 PM   #18
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Quote:
Originally Posted by NOTORIOUS VR View Post
Explain how he would hurt the center diff by doing that.
As Ivan stated it would kill the VC from overheating. Not because of the load, just because of the probability that one axle (more than likely front) would probably rotate more than the other. Like taking a quick stab at the e-brake won't mess anything up (unless you crash), but holding the e-brake for a long slide can.
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Old 12-30-2009, 01:18 PM   #19
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Originally Posted by propr'one View Post
^^the viscous coupling gets way too hot if you put too much torque though it for too long. Overheated VC's can fail very quickly.
You're sure they didn't account for that already? Would seem kind of strange to me if they didn't. How common are diff failures in Subarus?

Either way I'm glad I have a mechanical diff and don't need to worry about that...
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Old 12-30-2009, 01:26 PM   #20
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Quote:
Originally Posted by NOTORIOUS VR View Post
You're sure they didn't account for that already? Would seem kind of strange to me if they didn't. How common are diff failures in Subarus?

Either way I'm glad I have a mechanical diff and don't need to worry about that...
The viscous coupling is only used for limited slip, so when it fails you don't lose the centre diff technically, just the ability to distribute torque to the front and rear wheels. The torsen in the Audi's is superior though.
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Old 12-30-2009, 02:14 PM   #21
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The viscous coupling is only used for limited slip, so when it fails you don't lose the centre diff technically, just the ability to distribute torque to the front and rear wheels. The torsen in the Audi's is superior though.
That's a little bit of a confusing statement IMO.

If the center diff is of a VC unit, then a broken center diff will fail to lock which in turn will not send power to the slipping wheels. And I'm guessing the Subaru's are FWD biased? If it is, it won't be able to send power the rear wheels. If it's RWD biased it would be the other way around. Either way you would loose the use of the center diff totally.
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Old 12-30-2009, 02:26 PM   #22
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Sube's aren't fwd based (there are older exceptions with auto trannies), they're symmetrical. Think of it as a rear LSD with worn clutches will act as an open diff, this would be the same with a damaged VC. It would just send more torque to the slipping axle, just like how a 2wd car with an open diff would send more torque to the one slipping wheel.

As a note the newer STi's are torsen based.
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Old 12-30-2009, 03:25 PM   #23
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I don't get it... from a technical standpoint, if the VC were damaged it wouldn't be able to 'lock' or engage the clutches, thus not allowing a power transfer. And since the center diff is what transfers the power back/front, one set of axles wouldn't get any or minimal power.
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Old 12-30-2009, 05:01 PM   #24
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A VC never locks, just like a clutch pack never locks (without some electronic intervention anyway). They just prevent 100% slip. On a BMW for example with a clutch pack in the rear diff, you could launch and still have one rear wheel spinning 2-3 times faster than the other.
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Old 12-30-2009, 09:15 PM   #25
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Quote:
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A VC never locks, just like a clutch pack never locks (without some electronic intervention anyway). They just prevent 100% slip. On a BMW for example with a clutch pack in the rear diff, you could launch and still have one rear wheel spinning 2-3 times faster than the other.
A VC diff locks. Not 100% but the action of it transferring power from one shaft to the other is the act of it starting to lock up.

We're talking about the same thing just differently I think.
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