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G4LAND



Member Since: 16 Jan 2007
Location: VIGO
Posts: 154

Spain 
Rear Diferentia Lock, or not...

Long time no see you….
Hi friends, few months ago I sold my TDV8, but until now, Crying or Very sad nothing was the same on my long trips… so; ones again, I need one! Twisted Evil
I am seriously thinking to buy a 2010 MY 3.0 TDV6, and I have a doubt.
My previous RRS and of course my Bow down D3 G4 have the rear differential lock; I am not sure if I really need to pay for that, if the primary use this new RRS will be on road and sporadic medium off road. But, how this car works on snow road without the rear diff lock? It means, if I go to a snow place; may I affront“snow” roads? Or I need the rear dif lock to do it. If I am right, the previous Land Rover models, like Discovery 2, were without this option: only central lock like the Defender. I don’t remember any rear dif lock on my 02 Defender….
So…… rear dif lock, or not!!! Welcome opinions… Yuri
(ARS) XE1UN

13 RANGE ROVER SPORT HSE SDV6
Orkney Grey/Black
(Spain)

07 RANGE ROVER SPORT HSE TDV8
JavaBlack/Black
(SOLD)

05 DISCOVERY 3 G4 V8
(Spain)

02 DEFENDER 90 BLACK LE TD5
(SOLD)

13 FREELANDER 2 (LR2) HSE Lux SI4
Havana/Black
(Mexico)

Post #242308 Sun Nov 08 2009 12:30pm
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Leo



Member Since: 17 Sep 2007
Location: Nomad
Posts: 554

Kenya 

Go for it - it's well worth the price and can't be added later on.

Post #242317 Sun Nov 08 2009 5:24pm
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2nd Rower



Member Since: 12 Nov 2007
Location: Upside Down
Posts: 1382

Australia 2008 Range Rover Sport TDV6 HSE Chawton White

Leo wrote:
Go for it - it's well worth the price and can't be added later on.


Agreed, wish I had it on my car.

Post #242323 Sun Nov 08 2009 8:26pm
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lespes



Member Since: 16 Jun 2008
Location: Channel Islands
Posts: 1052

Guernsey 2006 Range Rover Sport TDV6 HSE Buckingham Blue

Waste of money in my book.

From other postings and web sites it would seem the general concenus is that it makes it a little easier with than without but you will still get through without it, though it is not as controlled in extremme conditions.

The traction control is way superior to the Disco 2 and this is why they then had to fit a diff lock as an option later on.

If it is only going to be used for medium off road use then would say it is overkill.

Save the money and buy a second pair of rims with off road tyres or snow and ice and this will benefit you more

Post #242341 Mon Nov 09 2009 12:30am
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ASH555



Member Since: 02 Dec 2006
Location: East Yorkshire
Posts: 750

England 2010 Range Rover Sport 3.0 TDV6 HSE Zermatt Silver

Personally the 2 RRS's i have owned haven't had it fitted and its not been missed, but if you can afford it and think you may need it then buy it Thumbs Up MY10 3.0 TDV6 HSE, Zermatt Silver, 20" Diamond Turned Alloys, Factory Privacy Glass, Premium Leather, Contrast Stiching, Side Steps, Etc

Gone 2006 '56' 2.7 TDV6 HSE, Zermatt Silver, 20", Side Steps, Brembos, Dynamic Pack, Etc

VW Transporter, 19" Rims, T32 170 BHP, Lowered

Post #242344 Mon Nov 09 2009 6:59am
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Very Annoyed
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Member Since: 23 Aug 2005
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United Kingdom 

The RRS doesn't really need it imho. When I've been off road I've only had the standard rear diff and my RRS got through places where cars with the rear diff got stuck and vice versa. 2005 Zambezi TDV6 - Gone but not forgotten
2009 Alaska TDV8 - Gone and much missed.



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Post #242369 Mon Nov 09 2009 9:56am
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Smarticus



Member Since: 26 May 2005
Location: Northumberland
Posts: 939

United Kingdom 2005 Range Rover Sport TDV6 HSE Rimini Red

I have never quite understood what the rear locking diff achieves when combined with the electronic traction control (ETC - that is standard on a RRS).

On my Defender (without ETC) I fitted a rear locking diff, so that if one rear wheel lost traction, the other rear wheel with traction still got power. An important addition - albeit expensive - especially when the rear half shafts broke due to the extra stress the diff lock threw at them.

But with the RRS with ETC, if one rear wheel loses traction the ETC stops that wheel spinning and diverts the power to the other wheel which still has traction. Surely this achieves pretty much what the diff lock achieves.

And if you need both rear wheels spinning to give you more push through snow or deep mud - then you can switch off the ETC. So (unless I have missed something here - which is perfectly possible - indeed quite likely) I can't see how the rear diff lock pays for itself ? RRS TDv8 HSE Rimini
Disco 4 TDv6 HSE Ipanema
Defender 90, 200tdi CSW

Post #242411 Mon Nov 09 2009 9:58pm
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2nd Rower



Member Since: 12 Nov 2007
Location: Upside Down
Posts: 1382

Australia 2008 Range Rover Sport TDV6 HSE Chawton White

Firstly let me say I'm not an expert in this space...

On paper I think you are 100% correct Smarticus.

However, I have found, in my personal experience, that I have sometimes have had to 'trick' the ETC to kick in using the brakes as or when the wheels have lost grip when off road. Particularly so when in bog holes, as sometimes the wheels spin and the car doesn't recognise lost traction.

Post #242412 Mon Nov 09 2009 10:14pm
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Smarticus



Member Since: 26 May 2005
Location: Northumberland
Posts: 939

United Kingdom 2005 Range Rover Sport TDV6 HSE Rimini Red

I can well imagine that scenario - electronic aids to traction can be a bit tricky as they can be a tad too "clever" for their own good - whereas mechanical aids are more basic - but do exactly what they are told to do.

Strangely I feel this compelling urge to spend some time in a bog hole right now Laughing RRS TDv8 HSE Rimini
Disco 4 TDv6 HSE Ipanema
Defender 90, 200tdi CSW

Post #242413 Mon Nov 09 2009 10:45pm
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Pelyma



Member Since: 28 Sep 2005
Location: Sussex
Posts: 1497

England 

The TC some slippage before it works the ediff doesn't. Cars equipped with it do make easier progress, but don't seem to be able to go any further. The skill of the driver is still the biggest advantage. Porsche Cayenne S Diesel 66 Plate

Post #242414 Mon Nov 09 2009 10:53pm
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The doc



Member Since: 31 Oct 2006

Posts: 1173

United Kingdom 

Get it Thumbs Up

Post #242425 Tue Nov 10 2009 7:03am
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Smarticus



Member Since: 26 May 2005
Location: Northumberland
Posts: 939

United Kingdom 2005 Range Rover Sport TDV6 HSE Rimini Red

Pelyma wrote:
The TC some slippage before it works the ediff doesn't. Cars equipped with it do make easier progress, but don't seem to be able to go any further. The skill of the driver is still the biggest advantage.


Pelyma - I am just speculating here (because I have never witnessed an ediff in action), but as it is an electronically controlled diff lock and not a mechanical locking mechanism - does the ediff not also need to "sense" that the diff is slipping before it locks up. Just like the ETC has to sense slippage on the wheel before it applies the brakes. As a result the ediff will still have a delay before it acts (whereas a mechanically locked diff wont allow any slippage at all). I would imagine that ETC is probably programmed to cut in after a longer delay (more slippage) than the ediff.

I also realise how even a very short delay in locking the diff or transfering power to another wheel could cause a momentary loss of forward motion which, on a steep ascent or in deep mud or sand, could be enough to stop the vehicle in a place where no aids to traction will regain forward motion. In that case if the ediff fires in quicker than ETC then it would give a better chance of maintaining forward motion. However the ETC delay is programmable, so maybe different TR settings reduce the ETC de;ay to minimise the risk of this effect ? RRS TDv8 HSE Rimini
Disco 4 TDv6 HSE Ipanema
Defender 90, 200tdi CSW

Post #242429 Tue Nov 10 2009 8:18am
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Leo



Member Since: 17 Sep 2007
Location: Nomad
Posts: 554

Kenya 

The rear diff lock makes a huge difference in some situations. ETC relies on braking spinning wheels to send drive to the wheel with traction. The diff lock, which engages in fractions of a second sends drive to both rear wheels without the brakes coming into play.

The difference is easily seen on very steep slopes with a loose surface combined with axle twisters or rocks. Probably not very common in the UK, but if you do go off roading in harsher parts of the world, then the rear e-diff is a necessity and in fact, comes as standard on all SA D3/D4 and RRS. All LRE cars have them too. Thumbs Up

Post #242431 Tue Nov 10 2009 8:38am
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diamond



Member Since: 09 Feb 2009
Location: Dusseldorf, Germany
Posts: 217

Greece 2009 Range Rover Sport TDV6 SE Alaska White

My experience with ediff is that it works much more smoothly and without any spinning especially in difficult situations like a cllimb in uneven rocky place for example.

What I realized is that you need to have low gear and rock crawl mode on TR to see the red lock on the rear axle in the 4x4 display (which denotes the activation of ediff). Maybe I'm wrong here.

The other benefit with ediff is that it DOES NOT use brakes for the job. 2009 Range Rover Sport 2.7 TDV6 SE, Alaska White, Almond leather, tinted windows, active rear diff, tow pack, HiICE, full spare: gone and already missed

2004 Fiat Panda 1.2 Climbing 4x4
http://www.youtube.com/watch?v=fAg4DdXAp7Y

Post #242433 Tue Nov 10 2009 9:06am
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Jimmy_75000



Member Since: 06 Oct 2006
Location: London, UK
Posts: 1146

France 2010 Range Rover Sport 3.0 TDV6 HSE Stornoway Grey

Silly one but on the 4x4 screen, if you have a rear dif, it showns by having two locks as oppose to one lock only, right? Range Rover Vogue ‘17 TDV6

Gone: Range Rover Vogue '11 4.4TDV8, Range Rover Sport ‘59, Range Rover Sport ‘56

Post #244024 Mon Nov 30 2009 1:08pm
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