H6 Outback 5 Speed Auto, is it VTD?

legacytt

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Launceston, Tasmania.
Car Year
1990
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Legacy
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Manual
Have been searching the net and it seems this is the case? VTD is standard in the the Subaru 5eat Auto in the Gen 4 (2003-2009) Outback and Liberty GT. Can anyone confirm this? Looking at an Outback for my next car and having had an earlier VTD auto I was impressed with the traction off road.
 
Think you're right but as it depends the different markets I'm not sure 100%.
 
OB gearbox

Thanks for the reply, from further research it appears all 5 speed had VTD and only some 4 speed if they were combined with VDC. The facelift model appears the go with SI drive and paddle shift.
 
6th digit on the transmission identification code:

C: Full-time AWD VTD 5AT

All H6s have VTD and a rear LSD.
 
VTD

Not sure on the CVT boxes. Thanks Venom for the clarification, presume the rear lsd is viscous?
 
Yes, my understanding is the 5 speed H6 has a viscous rear LSD and the centre diff has a 40:60 (F:R) bias from planetary gearing and includes a multiplate clutch for lock up. The confusing information out there is that when the clutch locks ups it can distribute up to 50:50 front rear torque. That part makes no sense at all. If it was capable of full lock up then it could distribute 100:0 or 0:100 front/rear and anything in between....same way as a locked diff does the same left/right. Now, this muliplate clutch likely can't achieve full lock up, but I reckon it can throw more or a assymetric bias than 50:50! there's a great new vid from Engineering Explained on this.
[ame="https://www.youtube.com/watch?v=WBQlK89PyxQ&index=1&list=FLQaqa63onWLwG-SVAN4jtxA"]How Every Single Modern Subaru AWD System Works - YouTube[/ame]
 
roo_shoota said:
Yes, my understanding is the 5 speed H6 has a viscous rear LSD and the centre diff has a 40:60 (F:R) bias from planetary gearing and includes a multiplate clutch for lock up. The confusing information out there is that when the clutch locks ups it can distribute up to 50:50 front rear torque. That part makes no sense at all. If it was capable of full lock up then it could distribute 100:0 or 0:100 front/rear and anything in between....same way as a locked diff does the same left/right. Now, this muliplate clutch likely can't achieve full lock up, but I reckon it can throw more or a assymetric bias than 50:50! there's a great new vid from Engineering Explained on this.
https://www.youtube.com/watch?v=WBQlK89PyxQ&index=1&list=FLQaqa63onWLwG-SVAN4jtxA
Click to expand...

Hmmmm !

I'll try to explain what I understand with my english, its not my mother tongue.

The centre differential is a planetary (epicycloidal) gearing with a multiplate clutch that can lock up as much as clutches can resist, for example, its not a good idea to make a U turn on dry tarmac when locked.

When locked, it does distribute torque 50:50 but if the front wheels are on ice and rear wheels on dry tarmac, 100% of the torque will go to the rear (resistance to rolling), same as a mechanical locker you mentionned above (L/R).

Even better than what I am able to explain : https://offroadsubarus.com/showthread.php?t=4110
 
And in the video, the guy says the STI has a helical front diff and a torsen rear...as far as I know a helical diff is a torsen (torque sensing) but not made by Torsen JTECT Corporation.
 
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