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12-29-2009, 11:06 PM
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#16
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6th Gear Member
Join Date: Mar 2004
Location: Toronto
Posts: 3,036
Car: E36 turbo
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Quote:
Originally Posted by thinair
That's a great way to kill a centre diff.
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Explain how he would hurt the center diff by doing that.
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12-29-2009, 11:27 PM
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#17
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JUICY J CAN'T
Join Date: Jun 2004
Location: T.
Posts: 16,967
Car: S54 titties
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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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12-29-2009, 11:40 PM
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#18
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moderationistismingly
Join Date: Dec 2001
Location: Bradford, ON
Posts: 8,792
Car: 97 328is-02 Impreza
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Quote:
Originally Posted by NOTORIOUS VR
Explain how he would hurt the center diff by doing that.
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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.
__________________
"Driving is like a narcotic, an addiction that can take over lives. It ruins people, breaks families apart, and even kills. It’s habit that needs to be fueled. Time, money, rationality, sweat, knuckle skin, and anyone who disapproves are of little importance to a driver, and are often overlooked. Hi, I’m Nelson, and I’m a drivaholic."
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12-30-2009, 01:18 PM
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#19
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6th Gear Member
Join Date: Mar 2004
Location: Toronto
Posts: 3,036
Car: E36 turbo
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Quote:
Originally Posted by propr'one
^^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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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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12-30-2009, 01:26 PM
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#20
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moderationistismingly
Join Date: Dec 2001
Location: Bradford, ON
Posts: 8,792
Car: 97 328is-02 Impreza
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Quote:
Originally Posted by NOTORIOUS VR
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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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.
__________________
"Driving is like a narcotic, an addiction that can take over lives. It ruins people, breaks families apart, and even kills. It’s habit that needs to be fueled. Time, money, rationality, sweat, knuckle skin, and anyone who disapproves are of little importance to a driver, and are often overlooked. Hi, I’m Nelson, and I’m a drivaholic."
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12-30-2009, 02:14 PM
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#21
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6th Gear Member
Join Date: Mar 2004
Location: Toronto
Posts: 3,036
Car: E36 turbo
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Quote:
Originally Posted by thinair
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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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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12-30-2009, 02:26 PM
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#22
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moderationistismingly
Join Date: Dec 2001
Location: Bradford, ON
Posts: 8,792
Car: 97 328is-02 Impreza
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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.
__________________
"Driving is like a narcotic, an addiction that can take over lives. It ruins people, breaks families apart, and even kills. It’s habit that needs to be fueled. Time, money, rationality, sweat, knuckle skin, and anyone who disapproves are of little importance to a driver, and are often overlooked. Hi, I’m Nelson, and I’m a drivaholic."
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12-30-2009, 03:25 PM
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#23
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6th Gear Member
Join Date: Mar 2004
Location: Toronto
Posts: 3,036
Car: E36 turbo
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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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12-30-2009, 05:01 PM
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#24
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moderationistismingly
Join Date: Dec 2001
Location: Bradford, ON
Posts: 8,792
Car: 97 328is-02 Impreza
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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.
__________________
"Driving is like a narcotic, an addiction that can take over lives. It ruins people, breaks families apart, and even kills. It’s habit that needs to be fueled. Time, money, rationality, sweat, knuckle skin, and anyone who disapproves are of little importance to a driver, and are often overlooked. Hi, I’m Nelson, and I’m a drivaholic."
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12-30-2009, 09:15 PM
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#25
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6th Gear Member
Join Date: Mar 2004
Location: Toronto
Posts: 3,036
Car: E36 turbo
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Quote:
Originally Posted by thinair
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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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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