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Rear lock diff retrofit for D3 and D4
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marcap599
 


Member Since: 13 Dec 2010
Location: Munchen
Posts: 959

Germany 2010 Discovery 4 3.0 TDV6 S Auto Aintree GreenDiscovery 4
Rear lock diff retrofit for D3 and D4

Hi to all,
one of the thing I wish to do in my 2010 3.0L TDV6 D4 is the fitting of a rear loking diff.
The mechanichal thing is not a big problem, but seems that the electronic is more complex to do.
In fact, in the microcat, I found two different set of wiring loom: for car with and without e-diff.

Searching in the forum did not help me to find someone that already done it.
Does anybody already done this mod?
 marcap599  
Post #109068819th Apr 2013 2:35 pm
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parrafin23
 


Member Since: 04 Dec 2011
Location: Buskeud
Posts: 678

Norway 2005 Discovery 3 TDV6 Commercial Auto Java BlackDiscovery 3

From the top of my head.. Yes this has been done It was a crazy Norwegian lad who did this on hees D3 without dif lock,
To make a long complex story short you need folowing:
Rear diff Ecu, It needs power and it needs to communicate with the rest of the car. Canbus. not sure of yours is Lin bus. Wel. after installin the the read locking diff. get the wires from the locking solenoid to the ecu, power to the ecu and communication wires to the ecu, you need someone to activate it.. to tell the car that it has it installed and ready to use.. perhaps install software on the ecu.

If there is no wiring for this in the vehicle you need to make your onw loom for this.. its not that hard.. you nust need to figure out where to connect the communication bus.. I bet you can connect it anywhere..

P.
  
Post #109074919th Apr 2013 4:20 pm
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wiggs
 


Member Since: 03 Sep 2006
Location: Manchester
Posts: 14368

United Kingdom 2015 Discovery 4 3.0 SDV6 HSE Auto Fuji WhiteDiscovery 4

I believe forum member "spooky " did this also ( on a D3 )

Here's some info on the subject

http://www.disco3.co.uk/forum/topic52473-15.html
 G4 Gone ...but not forgotten  
Post #109075319th Apr 2013 4:32 pm
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marcap599
 


Member Since: 13 Dec 2010
Location: Munchen
Posts: 959

Germany 2010 Discovery 4 3.0 TDV6 S Auto Aintree GreenDiscovery 4

Thanks both.
I'm not shure I want to go into the total OEM solution. By your point of wiew and your experience, wich kind of problem cames if I try to install a manual activable rear diff?
Something that works like the aftermarket ARB? "Switch and lock".

I suppose that this kind of solution cames really easy against the total retrofit, and I think more reliable too.

Than I can switch it on also in other situation... not only in crawling mode, like in solid-axle solution as Defender can fit. Nobody try this way?
 marcap599  
Post #109093419th Apr 2013 8:32 pm
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sheerluck
 


Member Since: 11 Feb 2013
Location: Brisbane
Posts: 208

Australia 2007 Discovery 3 TDV6 SE Auto Zermatt SilverDiscovery 3

There was a post on AULRO recently about the impending release of a front locker for the D3/4 but no rear locker:
http://www.aulro.com/afvb/d3-d4-rrs/163525...onish.html
  
Post #109096019th Apr 2013 8:55 pm
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parrafin23
 


Member Since: 04 Dec 2011
Location: Buskeud
Posts: 678

Norway 2005 Discovery 3 TDV6 Commercial Auto Java BlackDiscovery 3

Thinking og the Arb locker.. does it lock 100% on the rear axle? so both rear wheels rotates @ the same speed?
I thought there had so be some kind of a clutch type lock. what happens if you lock the rear axle and the traction controll kicks in on one wheel? that would put loads of stress in the drive train perhaps?

P.
  
Post #109107320th Apr 2013 7:37 am
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marcap599
 


Member Since: 13 Dec 2010
Location: Munchen
Posts: 959

Germany 2010 Discovery 4 3.0 TDV6 S Auto Aintree GreenDiscovery 4

sheerluck wrote:
There was a post on AULRO recently about the impending release of a front locker for the D3/4 but no rear locker:
http://www.aulro.com/afvb/d3-d4-rrs/163525...onish.html


Seems the only place on the web were someone is talking about that... not sure 100% it is really true.
 marcap599  
Post #109111820th Apr 2013 8:46 am
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marcap599
 


Member Since: 13 Dec 2010
Location: Munchen
Posts: 959

Germany 2010 Discovery 4 3.0 TDV6 S Auto Aintree GreenDiscovery 4

parrafin23 wrote:
Thinking og the Arb locker.. does it lock 100% on the rear axle? so both rear wheels rotates @ the same speed?
I thought there had so be some kind of a clutch type lock. what happens if you lock the rear axle and the traction controll kicks in on one wheel? that would put loads of stress in the drive train perhaps?

P.


If the loker is closed why the traction control should lock one wheel? It cames only when the different speed of rotation between the wheel (and some things more) exceed a limit.
If the wheels rotate at the same speed the traction control don't do nothing.

The problem is driving a rear loked on the road. But seems from my first analysis on the e-diff that it can self-disengage if some stress is coming from the wheels. Anyway this is a common problem of each rear locking system except one: http://www.youtube.com/watch?v=LtUQT0ON3ZY that combine in one single solution all the benefits. Unfortunately it is not available for D3 and D4.

Well, seems that the fitting non OEM solution on the rear locking diff is unexplored. Found something to do in this raining w.e. in Desenzano....
 marcap599  
Post #109112120th Apr 2013 9:00 am
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sheerluck
 


Member Since: 11 Feb 2013
Location: Brisbane
Posts: 208

Australia 2007 Discovery 3 TDV6 SE Auto Zermatt SilverDiscovery 3

marcap599 wrote:


Seems the only place on the web were someone is talking about that... not sure 100% it is really true.


If I were you I'd close your eyes when you open this page then: Laughing
http://www.devon4x4.com/pedantry-millimetr...;Itemid=14
  
Post #109114720th Apr 2013 9:54 am
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marcap599
 


Member Since: 13 Dec 2010
Location: Munchen
Posts: 959

Germany 2010 Discovery 4 3.0 TDV6 S Auto Aintree GreenDiscovery 4

sheerluck wrote:
marcap599 wrote:


Seems the only place on the web were someone is talking about that... not sure 100% it is really true.


If I were you I'd close your eyes when you open this page then: Laughing
http://www.devon4x4.com/pedantry-millimetr...;Itemid=14


wow, seems a great option!
I'll try to email arb ad look what happen!
 marcap599  
Post #109116320th Apr 2013 11:44 am
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PSC
 


Member Since: 01 May 2006
Location: Johannesburg
Posts: 255

South Africa 2010 Discovery 4 5.0 V8 HSE Auto Fuji WhiteDiscovery 4

ARB part # RD217

Discovery Series III/IV, Front 2004 on, IFS, 29 spline, clamshell type, Part # RD217
  
Post #109139820th Apr 2013 8:59 pm
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marcap599
 


Member Since: 13 Dec 2010
Location: Munchen
Posts: 959

Germany 2010 Discovery 4 3.0 TDV6 S Auto Aintree GreenDiscovery 4

PSC wrote:
ARB part # RD217

Discovery Series III/IV, Front 2004 on, IFS, 29 spline, clamshell type, Part # RD217


I've jus mailed ARB to get more info. In the website from DEVON it is not indicated if it is for front or rear application. Seems also expansive for £1,017.79 (inc vat), of course, actually no competitors.

The application of a rear difflock for who one like me don't have the OEM one still look intresting.
I think I'll try to start a DIY fitting in this way:

REAR: LR original rear e-diff + custom made activation system

FRONT: ARB option, if they confirm something by email. Kaiser loker custom modified in second choice

Well, for the rear, here the steps I'm going to follow:
First step: Sourcing one of the electric actuators of the e-diff. Got one from scrap thanks a cooperation from a friend. -> DONE
Second step: Getting a wiring diagram of what's inside, trying to understand how it works. Found it on a docs from LR -> DONE
Third step: design a PCB and writing a software able to activate it. -> Actually on the way....
Fourth step: Try to put togeter the new PCB and a full rear axle with e-diff and looks if it's work or not. -> Actually so far.
 marcap599  
Post #109157421st Apr 2013 12:39 pm
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sheerluck
 


Member Since: 11 Feb 2013
Location: Brisbane
Posts: 208

Australia 2007 Discovery 3 TDV6 SE Auto Zermatt SilverDiscovery 3

Even though it doesn't say on the Devon 4x4 website, ARB are developing a front locker only, according to the information we were given on AULRO (due to there being an OEM option for the rear).
  
Post #109158521st Apr 2013 1:00 pm
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PSC
 


Member Since: 01 May 2006
Location: Johannesburg
Posts: 255

South Africa 2010 Discovery 4 5.0 V8 HSE Auto Fuji WhiteDiscovery 4

Correct front only, listed as N/A for the rear

Marcap - if I remember correctly the side shafts/cv joints are stronger on the e-diff vehicles
  
Post #109159421st Apr 2013 1:12 pm
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marcap599
 


Member Since: 13 Dec 2010
Location: Munchen
Posts: 959

Germany 2010 Discovery 4 3.0 TDV6 S Auto Aintree GreenDiscovery 4

sheerluck wrote:
Even though it doesn't say on the Devon 4x4 website, ARB are developing a front locker only, according to the information we were given on AULRO (due to there being an OEM option for the rear).


Well, seems that some DIY for the rear is really required... not only to save money!
 marcap599  
Post #109159521st Apr 2013 1:12 pm
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