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Gurvan
Member Since: 02 Jan 2005
Location: Germany... Not far from both the US and Hard German rock...
Posts: 1089
  
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| Manual locking of differential... |
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Hello Guys & Girls,
One question has cropped up on the French forum www.landmania.com : is it possible on a Disco 3 equipped with differential locking (Rear or Central), is it possible to manually lock those ? Is there something to be done ??
I think not, but I would like to be sure... So, if anyone knows, I'll post the answer, in french, over there... 
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 21st Jul 2005 5:13 pm |
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Winger
Site Moderator
Member Since: 15 Feb 2005
Location: UK
Posts: 3428
 
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No, though in certain situations in "Rock Crawl" the diff will lock immediately the programme is selected.
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| 21st Jul 2005 5:25 pm |
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Slimer
Site Moderator
Member Since: 06 Jan 2005
Location: Last Exit to Nowhere
Posts: 16295
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No, TR decides when to lock/unlock them (seems to do a fairly good job too), you don't get any manual control
The Central one is standard on all D3s but as the Rear is optional a manual version will no doubt be available sooner or later (sooner if Brian has anything to do with it I suspect )
Si The End
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| 21st Jul 2005 5:28 pm |
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Gurvan
Member Since: 02 Jan 2005
Location: Germany... Not far from both the US and Hard German rock...
Posts: 1089
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Do you mean that the "rock crawl" mode almost certainly implies the locking of differential ?
Thanks anyway... I guess that the one asking the question over there is not too eager to let the elctronics have their way...
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| 21st Jul 2005 5:28 pm |
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Winger
Site Moderator
Member Since: 15 Feb 2005
Location: UK
Posts: 3428
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No, but I wanted to make the point that when you select one of the TR programmes, and Rock Crawl is the one it is most likely to happen in, depending upon vehicle situation the diff might lock immediately - giving the impression of some form of "manual" control.
What is interesting is driving a vehicle with the optional rear locking diff and observing how infrequently the thing actually locks.
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| 21st Jul 2005 5:32 pm |
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simon
Member Since: 11 Jan 2005
Location: Shropshire
Posts: 18296
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Best leave the car to do what it does from what I can gather... the latest One Life mag has a description of how it works. Was posted in the gallery I think or in a post somewhere on here...
-s
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| 21st Jul 2005 5:34 pm |
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Gurvan
Member Since: 02 Jan 2005
Location: Germany... Not far from both the US and Hard German rock...
Posts: 1089
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Now, I know that I should have said a poll...
I agree that the car probably knows better than I do... I was just trying to find out if someone knew differently...
Seems not...
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| 21st Jul 2005 5:45 pm |
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ducati
Member Since: 06 May 2005
Location: Ohio, USA
Posts: 180
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I often use Terrain Response to "choose" whether the diffs are locked (or likely to lock). Rock crawl has the greatest amount of preload on the diffs, and I'll use it sometimes in the forest if I come to a difficult, slow, cross-axling situation. Additionally, if I find the rear locker is causing "crabbing" on side-tilts in slipprey mud, I will dial up "grass/gravel/snow" which has a light preload and often allows the diff to unlock (and thus keeps me on the mountainside, and not tumbling off!)
I know, I know, the computers know better.  '05 LR3 HSE
Departed: '62 Series IIA, '02 Freelander, '03 Disco
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| 22nd Jul 2005 12:04 pm |
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BN
Member Since: 18 Mar 2005
Location: Here
Posts: 6463
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Ducatti has summed it up well, by using the settings in the case of the D3. Don't forget if you go off roading in a vehicle that you do not know the full working of, it is like travelling along a road without brakes. Off road driving is often the opposite to on road in driving techniques.
Getting back to the rear diff. It works in conjunction to its pre set programs.
I am waiting for the ARB air lockers to come out. They are trying them I found out the other day. If so, they are the diffs to get, because you control them not the car.
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| 22nd Jul 2005 12:11 pm |
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P. Bianchi
Member Since: 11 Dec 2004
Location: Oltrepo' Pavese, Italy
Posts: 59
 
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Winger wrote:
What is interesting is driving a vehicle with the optional rear locking diff and observing how infrequently the thing actually locks.
How do you tell rear diff has locked? A warning light? a dashboard message? you deduce from wheels not spinning? you deduce from axle break?
Thanks!
PB P. Bianchi, D3 TDV6 HSE - manual, nav 4x4 info, electric roof, rear diff, EGR blanked, EPB actuator changed 3rd times --> twirling balls, compressor twice, no longer MSV-2, Oltrepo' Pavese Hills, Pavia, Italy
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| 17th Jan 2006 12:14 pm |
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Pelyma
Member Since: 06 Jan 2005
Location: Patching, Sussex
Posts: 15496
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You will need the 4x4 info centre which shows a padlock sign, red for locked, green for unlocked. Otherwise trust in God!! DS3 TDV6 HSE - Silver with Alpaca (old one) Gone
DS3 TDV6 HSE- Silver with Alpaca (new one) Gone
D4 HSE Lux - Montalcino Red Gone
Porsche Cayenne V8 Diesel S
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| 17th Jan 2006 1:01 pm |
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P. Bianchi
Member Since: 11 Dec 2004
Location: Oltrepo' Pavese, Italy
Posts: 59
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Pelyma wrote:You will need the 4x4 info centre
Bwaaa, i don't have the 4x4 info center, only the plain SatNav. How do i possibly upgrade to premium nav? Is it a simple software issue, or do i need additional hardware to be fitted?
thanks!
ciao P. Bianchi, D3 TDV6 HSE - manual, nav 4x4 info, electric roof, rear diff, EGR blanked, EPB actuator changed 3rd times --> twirling balls, compressor twice, no longer MSV-2, Oltrepo' Pavese Hills, Pavia, Italy
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| 17th Jan 2006 1:31 pm |
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Pelyma
Member Since: 06 Jan 2005
Location: Patching, Sussex
Posts: 15496
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Factory fit only  DS3 TDV6 HSE - Silver with Alpaca (old one) Gone
DS3 TDV6 HSE- Silver with Alpaca (new one) Gone
D4 HSE Lux - Montalcino Red Gone
Porsche Cayenne V8 Diesel S
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| 17th Jan 2006 2:05 pm |
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tucker_j
Member Since: 01 Oct 2005
Location: England
Posts: 203
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P. Bianchi wrote:
How do you tell rear diff has locked? A warning light? a dashboard message? you deduce from wheels not spinning? you deduce from axle break?
PB
When traction and forward momentum is suddenly restored 
When I did the experience in an HSE the instructor got it into a downhill rock-crawl with the potential for cross-articulation. Going along on tickover and brake, as soon as we got stuck I just gently released and reapplied the brake until the lock symbol appeared on the rear diff and away we went
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| 17th Jan 2006 3:41 pm |
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Smarticus
Member Since: 01 Jan 2005
Location: Northumberland
Posts: 655
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I don't understand how the ETC and diff locks "interact".
Where there is normal mechanical transmission (no electronics such as ABS, ETC etc), a diff lock simply ensures that equal amounts of turning force travels down each leg of the axle. As a result if one side is slipping and the other side is gripping, away you go. Without a diff lock the slipping side gets all the turning force and the gripping side gets none. So obviously a diff lock gets you moving in such a situation.
Where there are electronics in play, a slipping wheel is stopped from slipping by application of the brakes and as a result, all of the turning force travels into the gripping wheel (I think). If there was diff lock in this situation the brakes would burn out or something would break.
I remember that the TD5 disco didn't even have a centre diff lock because of this. It was only replaced under presure from the US market where a diff lock is an important phallic symbol.
So why on a D3 can you get a diff lock in the rear axle and what does it do ? I guess when the diff lock kicks in the electronics must switch off. Maybe I am completely missing the point here (I never was great at physics or mechanics), but I simply don't see what the diff lock achieves ? Disco 4 TDV6HSE
Defender 200TDi CSW
RR Evoque
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| 17th Jan 2006 9:00 pm |
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