Sidestick
Member Since: 22 Apr 2012
Location: Rome
Posts: 2288
  
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| Center differential lock management |
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Hello guys anybody managed a way to lock and maintain locked the center diff? - Easy-Lift suspension module 4.0
- GoodWinch 9500 lb
- Full underbody protections
- Tree/Rock sidebars
- Prospeed roofrack & ladder
- Compressor guard
- Raised Air Intake
- Driving lights (2+4)
- 50 mm Waffle boards
- Altox Heater control
- Overland Rooftop Tent
- Rear seats entertainment
- Front & Rear camera
- GVIF
- Removable tow bar
- Cubby box fridge
- BFG KO2 265/65R17
- iidTool BT
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 22nd Oct 2020 1:28 pm |
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garrycol
Member Since: 06 Dec 2010
Location: Canberra
Posts: 1115
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Go into Rock Crawl.
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| 23rd Oct 2020 1:42 am |
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Sidestick
Member Since: 22 Apr 2012
Location: Rome
Posts: 2288
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Tks dude, but if you steer or increase the speed the center diff unlock itself  - Easy-Lift suspension module 4.0
- GoodWinch 9500 lb
- Full underbody protections
- Tree/Rock sidebars
- Prospeed roofrack & ladder
- Compressor guard
- Raised Air Intake
- Driving lights (2+4)
- 50 mm Waffle boards
- Altox Heater control
- Overland Rooftop Tent
- Rear seats entertainment
- Front & Rear camera
- GVIF
- Removable tow bar
- Cubby box fridge
- BFG KO2 265/65R17
- iidTool BT
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| 23rd Oct 2020 12:56 pm |
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Motolab
Member Since: 18 Oct 2019
Location: Sleen
Posts: 1815
 
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Yes... ofcourse, otherwise things will break.... Best regards
Harold
Always looking for Pre '55's & Pre war British Motorcycles! knowing or having one for sale? PM please. I visit the UK 6 times a year
Ps. I edit my texts quite often, english is not my native language, so I will edit My “typo’s” etc. 
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| 23rd Oct 2020 5:32 pm |
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riverblanche
Member Since: 31 Aug 2010
Location: retford'ish
Posts: 2210
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Hi,
dont think locking the center diff should break anything IF its used in the correct situation
I fitted a center diff lock to our old D2 and used it many times with no breakages
Think its knowing when to Unlock it again thats important.
sadly no idea how to do it on a D3 
 Transit! 2019
Gone D3 HSE 2008
Another Porsche Cayenne 2022
Gone Porsche Cayenne 2020
Gone RRS HSE Dynamic 2016
Gone RRS HSE LUX 2011
Gone RRS HSE 2006
Gone D3 SE 2.7 2008
gone D2 Td5 1999
I plan on living forever and so far so good !
Club DG Mclaren stuff
.
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| 23rd Oct 2020 6:42 pm |
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Motolab
Member Since: 18 Oct 2019
Location: Sleen
Posts: 1815
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There is always an IF ofcourse
I should have said or added: “in the wrong steering hands”
BUT LR meant it as a safety precaution, at certain speed (and steering ?) angle it unlocks.. Best regards
Harold
Always looking for Pre '55's & Pre war British Motorcycles! knowing or having one for sale? PM please. I visit the UK 6 times a year
Ps. I edit my texts quite often, english is not my native language, so I will edit My “typo’s” etc.
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| 23rd Oct 2020 7:27 pm |
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garrycol
Member Since: 06 Dec 2010
Location: Canberra
Posts: 1115
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People really do need to understand how their car works and what different controls do.
The centre diff lock in a D3 etc is not directly controllable by the driver. The only time the CDL is fully locked (and it stays locked) is if you select Rock Crawl - BUT you are then also limited by the other functions of Rock Crawl - eg must be in low range and at offroad height - so max of 50kph. If you select this on the bitumen then you will get transmission windup and the system will let it the cdl slip to protect the drive train - but if rock crawl is selected where it is meant to be used then this does not happen.
In all other TR settings the CDL will change from being fully open to fully locked (rarely) and everything in between as determined by the characteristics of the TR setting and the terrain being driven over. You cannot control this - so yes the cdl will unlock or go less locked with changes in speed and steering angle. If the car senses it needs more cdl lock then it will provide. From the drivers seat this is all seamless and you will not know what is happening with the cdl - it is only if you have the screen that you can see what is happening.
To the OP why do you want to keep the cdl locked at speed and tight turning??
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| 24th Oct 2020 12:59 am |
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Sidestick
Member Since: 22 Apr 2012
Location: Rome
Posts: 2288
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ARB makes front & rear lockers for Disco3, a friend of mine fit them but while facing to hard obstacle with front & rear lockers on the car opens the center diff (also in rock crawl mode) vanishing the capability to cross over it 
From what i know also the New Defender has the option to maintain locked the center diff (via the touch screen menu) so i suppose that some guru could find a way to do the same on our old D3  - Easy-Lift suspension module 4.0
- GoodWinch 9500 lb
- Full underbody protections
- Tree/Rock sidebars
- Prospeed roofrack & ladder
- Compressor guard
- Raised Air Intake
- Driving lights (2+4)
- 50 mm Waffle boards
- Altox Heater control
- Overland Rooftop Tent
- Rear seats entertainment
- Front & Rear camera
- GVIF
- Removable tow bar
- Cubby box fridge
- BFG KO2 265/65R17
- iidTool BT
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| 24th Oct 2020 8:54 am |
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Hardware
Member Since: 28 Jun 2016
Location: Hiding under the M60
Posts: 12709
  
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so ... if front or back wheels, locked as a pair, are spinning will that not trigger the brakes on that axle so that all power is fed to the other pair ? in that case, to my way of thinking, the centre diff would NOT be locked.
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| 24th Oct 2020 9:10 am |
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DG
Site Moderator
Member Since: 12 Dec 2005
Location: The Gaff
Posts: 50934
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Quote:The multi-plate clutch assembly for both centre and rear differentials act in a similar way. The aim of the multi-plate clutch assembly is to prevent excessive differential slip and therefore maximise the traction performance of the vehicle. This is fundamentally different from the 'braked' traction control, which can only counter act differential slip when it occurs.
A certain amount of differential slip is required to allow the vehicle to turn corners and to remain stable under control of the Anti-lock Braking System (ABS). The transfer box control module monitors the driver's demands through primary vehicle controls and automatically sets the slip torque at the differentials. The system is completely automatic and does not require any special driver input.
The multi-plate clutch assembly actively controls the torque flow through the centre differential and optimises the torque distribution in the driveline. The clutch assembly biases the torque from the transmission to the axle and wheels with the higher grip and prevents the wheels with the lower grip from spinning.
The multi-plate clutch assembly comprises the sprocket (7), which is connected to the front differential side gear, the motor levers (5) with the ball ramp mechanism (6), the clutch hub (1) as support for the clutch plates (3), the clutch piston (4) to generate friction between the clutch plates, and a pack of cup springs (2) to return the clutch piston into its original position.
One set of friction plates are connected to the clutch hub; the other set of friction plates are connected to the multi-plate clutch basket, which is welded to the centre differential housing.
21 year LR veteran > D2 GS 2003 > D3 S 2006 > D3 HSE 2009 > D4 HSE 2013 > D4 HSE 2015 > D5 HSE 2018 > DS HSE R-Dynamic P300e 2021
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| 24th Oct 2020 11:40 am |
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Sidestick
Member Since: 22 Apr 2012
Location: Rome
Posts: 2288
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The clutch assembly biases the torque from the transmission to the axle and wheels with the higher grip and prevents the wheels with the lower grip from spinning.
This means that on loosing rocks or over steep graveled climb, with axels locked, the center diff won't distribute the torque on both axels permitting a certain amount of slip between them.
Should be nice to have the option to maintain fully locked the center diff as on a Disco2. - Easy-Lift suspension module 4.0
- GoodWinch 9500 lb
- Full underbody protections
- Tree/Rock sidebars
- Prospeed roofrack & ladder
- Compressor guard
- Raised Air Intake
- Driving lights (2+4)
- 50 mm Waffle boards
- Altox Heater control
- Overland Rooftop Tent
- Rear seats entertainment
- Front & Rear camera
- GVIF
- Removable tow bar
- Cubby box fridge
- BFG KO2 265/65R17
- iidTool BT
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| 24th Oct 2020 1:42 pm |
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Sidestick
Member Since: 22 Apr 2012
Location: Rome
Posts: 2288
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Hardware wrote:so ... if front or back wheels, locked as a pair, are spinning will that not trigger the brakes on that axle so that all power is fed to the other pair ? in that case, to my way of thinking, the centre diff would NOT be locked.
On disco2 the TC works also on "axels" spin difference, on D3s brakes are not used to limit this difference  - Easy-Lift suspension module 4.0
- GoodWinch 9500 lb
- Full underbody protections
- Tree/Rock sidebars
- Prospeed roofrack & ladder
- Compressor guard
- Raised Air Intake
- Driving lights (2+4)
- 50 mm Waffle boards
- Altox Heater control
- Overland Rooftop Tent
- Rear seats entertainment
- Front & Rear camera
- GVIF
- Removable tow bar
- Cubby box fridge
- BFG KO2 265/65R17
- iidTool BT
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| 24th Oct 2020 1:45 pm |
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DG
Site Moderator
Member Since: 12 Dec 2005
Location: The Gaff
Posts: 50934
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IMO there's little point in comparing how the D3/4 systems combine to provide traction against the older techs found in the Disco2 or Defender ....The truth is that you don't really need to worry about how it works...it just does. 21 year LR veteran > D2 GS 2003 > D3 S 2006 > D3 HSE 2009 > D4 HSE 2013 > D4 HSE 2015 > D5 HSE 2018 > DS HSE R-Dynamic P300e 2021
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| 24th Oct 2020 2:03 pm |
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Sidestick
Member Since: 22 Apr 2012
Location: Rome
Posts: 2288
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DG, unfortunately it doesn't with lockers on (ARB)... - Easy-Lift suspension module 4.0
- GoodWinch 9500 lb
- Full underbody protections
- Tree/Rock sidebars
- Prospeed roofrack & ladder
- Compressor guard
- Raised Air Intake
- Driving lights (2+4)
- 50 mm Waffle boards
- Altox Heater control
- Overland Rooftop Tent
- Rear seats entertainment
- Front & Rear camera
- GVIF
- Removable tow bar
- Cubby box fridge
- BFG KO2 265/65R17
- iidTool BT
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| 24th Oct 2020 4:25 pm |
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Motolab
Member Since: 18 Oct 2019
Location: Sleen
Posts: 1815
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Sidestick wrote: DG, unfortunately it doesn't with lockers on (ARB)... Big Cry |
May i ask, in your theory or did your friend experience that for real?
What does ARB themselves say about Disco3 use? And our assie forummembers? Or on alpro forum?
IS it an issue in the real world?
Just asking.. Best regards
Harold
Always looking for Pre '55's & Pre war British Motorcycles! knowing or having one for sale? PM please. I visit the UK 6 times a year
Ps. I edit my texts quite often, english is not my native language, so I will edit My “typo’s” etc.
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| 24th Oct 2020 6:23 pm |
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