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  #1  
Old 27th March 2017, 03:25 AM
legacytt legacytt is offline
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Default H6 Outback 5 Speed Auto, is it VTD?

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.
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Old 28th March 2017, 04:59 PM
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Think you're right but as it depends the different markets I'm not sure 100%.
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Old 31st March 2017, 02:23 AM
legacytt legacytt is offline
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Default 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.
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Old 13th April 2017, 10:39 AM
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Not sure but the VTD auto is brilliant offroad!!
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Old 30th April 2017, 04:23 AM
Venom Venom is offline
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6th digit on the transmission identification code:

C: Full-time AWD VTD 5AT

All H6s have VTD and a rear LSD.
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Old 4th May 2017, 08:50 AM
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Quote:
Originally Posted by Venom View Post
All H6s have VTD and a rear LSD.
Don't latest ones have the CVT transmission? They wouldn't be VTD centre diff, would they?
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Old 7th May 2017, 01:05 AM
legacytt legacytt is offline
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Default VTD

Not sure on the CVT boxes. Thanks Venom for the clarification, presume the rear lsd is viscous?
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Old 7th July 2017, 10:26 AM
roo_shoota roo_shoota is offline
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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=WBQl...WLwG-SVAN4jtxA
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Old 8th July 2017, 09:29 AM
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Quote:
Originally Posted by roo_shoota View Post
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=WBQl...WLwG-SVAN4jtxA
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 : http://offroadsubarus.com/showthread.php?t=4110
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Old 8th July 2017, 09:41 AM
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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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