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russel
Member Since: 20 Mar 2009
Location: Beds
Posts: 6
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| rear differential lock versus traction control |
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Hi all
I am interested in buying a new D3 for on-road and off-road driving. It seems most D3s are sold without rear differential locks. If I understand correctly, these D3s use traction control (involving electronic control of ABS) in slippery conditions. How do these vehicles perform off-road when compared with D3s with rear differential locks ? Would any of you recommend factory installation of a rear differential lock in preference to a standard vehicle without ?
Regards
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 28th Mar 2009 4:49 pm |
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heine
Member Since: 07 Feb 2007
Location: Midrand
Posts: 4054
  
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Ideally you should switch DSC off when offroading , So yes a rear locker then makes a huge difference
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| 28th Mar 2009 4:54 pm |
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10forcash
Member Since: 09 Jun 2005
Location: Ubique
Posts: 16534
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An active rear diff is great for maintaining momentum, traction control maintains / tries to regain traction once it detects wheel spin outside of the TR thesholds
Two systems for two different purposes
Personally i'd selectively disengage DSC dependent upon the terrain, not in all cases
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| 28th Mar 2009 5:05 pm |
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Willy Eckerslike
Member Since: 12 Jan 2009
Location: N Yorks
Posts: 1612
  
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Please explain further Heine, cos this isn't whats taught by LRE, I also beleive that the centre differential locks electronically depending on which setting is being used, also you cannot fully turn off the DSC.
The rear diff seems to make the car react to a slippery condition slightly quicker.
I of course could be wrong but maybe AndrewS / TFC or one of the other experienced offroaders could shed some light on this.
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| 28th Mar 2009 5:08 pm |
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10forcash
Member Since: 09 Jun 2005
Location: Ubique
Posts: 16534
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Willy, yep, forgot to mention the active centre differential (part of the transfer box), this is fitted to all versions of the D3
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| 28th Mar 2009 5:11 pm |
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DiscoDunc
Member Since: 08 May 2006
Location: Bristol
Posts: 16390
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russel
If you are buying new i would have it (Oh, i did  )
its about £500 so in the whole scheme of things not a lot..
It wont get you places that non-rear-diff D3s cant go but will get you there with a little less fuss  Duncan
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| 28th Mar 2009 5:18 pm |
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russel
Member Since: 20 Mar 2009
Location: Beds
Posts: 6
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Hi
I know that the centre differential lock is standard on d3s. The kind of situation I am thinking about is if one is rock climbing on a hill, or climbing a hill on a rocky, muddy track. If only one rear wheel and tyre has significant traction, then a rear differential lock together with the centre differential lock must be the best way to deliver torque to that wheel. I'm not sure how traction control would work under similar circumstances, or whether it would work effectively at all.
I have been advised by a LR off-road driving instructor that a rear differential lock is essential for this kind of off-road driving.
Regards
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| 28th Mar 2009 5:28 pm |
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Roel
Member Since: 16 Aug 2008
Location: home
Posts: 1215
 
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What I find that the main difference is that with Traction control you need the wheels spinning about 7 km/hr (I believe) and with the rear locker you hardly see any wheelspin if the other rear wheel has traction. Roel
1997 Camel Trophy Disco ex-P101JWK (traded it for a Britains 42101)
1984 90 TD5
2005 G4 Disco 3 BN55WPT
Also member of club MTR
and Club Faultmate
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| 28th Mar 2009 5:33 pm |
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10forcash
Member Since: 09 Jun 2005
Location: Ubique
Posts: 16534
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firstly, if climbing a rocky slope, you wouldn't want momentum, secondly, due to the weight transfer i'd be more worried about losing grip on the front wheels (TC will deal with this) in the situation you describe, TC will act upon the rear wheel with limited traction allowing the other rear wheel to provide forward motion until tractive grip is restored. but beware of torque steer on the rear if only one wheel has grip
I too am an LRE instructor, not being party to the conversation, I couldn't really comment upon the validity of the suggestion...
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| 28th Mar 2009 5:34 pm |
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Rich71
Member Since: 21 Feb 2009
Location: Hitchin
Posts: 81
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The traction control will keep you moving, just not as efficicently as the diff lock. When the wheels start to spin just keep the power on and let the T/C sort it out. It works very well on the freelanders I used off road and so far is equally good if not better on the disco. I dont have a locking rear diff and at the moment dont see the need to get one.
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| 28th Mar 2009 5:44 pm |
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russel
Member Since: 20 Mar 2009
Location: Beds
Posts: 6
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Hi 10forcash
Can you advise me of the circumstances when a rear differential lock would be a useful off-road feature, that would add significantly to the off-road ability of the d3 ? I wish to make the best judgement now regarding the purchase of a standard d3 (discounted), or a factory built one (with active rear differential lock).
Regards
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| 28th Mar 2009 5:44 pm |
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CFB
Member Since: 02 Dec 2005
Location: Bradford, West Yorkshire
Posts: 6100
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Slippery slopes are the places where you benefit most from the rear diff lock. As others have said it helps maintain momentum before TC kicks in.
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| 28th Mar 2009 6:49 pm |
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Getafix
Member Since: 13 Sep 2007
Location: Melbourne
Posts: 229
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so, with DSC off, without diff lock, we then have "open" rear diff, with power going to the wheel with least traction left or right?  <*(((<<
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| 29th Mar 2009 11:32 am |
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caverD3
Member Since: 03 Jul 2006
Location: Oberon, NSW
Posts: 6922
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DiscoDunc wrote:russel
If you are buying new i would have it (Oh, i did )
its about £500 so in the whole scheme of things not a lot..
It wont get you places that non-rear-diff D3s cant go but will get you there with a little less fuss
Same here. I have one and I am glad I did. A D3 without will get up the same section but with a bit more drama. “There are only three sports: bullfighting, motor racing, and mountaineering; all the rest are merely gamesâ€
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| 29th Mar 2009 11:43 am |
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GraemeS
Member Since: 17 Mar 2008
Location: NSW
Posts: 706
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Getafix wrote:so, with DSC off, without diff lock, we then have "open" rear diff, with power going to the wheel with least traction left or right?
As I understand, DSC off disables power reduction, not TC.
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| 29th Mar 2009 12:18 pm |
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