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AndrewS

Member Since: 10 Apr 2007
Location: Hereford
Posts: 3707

2013 Defender 130 Puma 2.2 SW Rimini Red

Defender 4x4 system info

Basic Layout.

A centre differential is required to allow the vehicle to turn corners. See below, the front axle has a different arc to the rear.

On Firm Ground we have 25% traction/drive at each wheel

The down side of a centre diff is it will allow all the drive to one wheel if traction is lost.

So when this happens lock the diff and drive will be forced 50% front 50% rear. The the diagram shows below that the rear 50% drive will enable forward motion.

Once moving the front wheels will then keep the vehicle moving as the rear looses traction.

Now add some Traction Control and with 3 wheels without traction the brakes are applied to these wheels (20 times a second I think) forcing the drive to the fourth wheel resulting in forward motion.

16th Jan 2010 4:30pm

AndrewS

Member Since: 10 Apr 2007
Location: Hereford
Posts: 3707

Thought I would add this as well. A very simple, very old explanation of why diffs are required and how they work.

&feature=related

16th Jan 2010 4:38pm

willy eckerslike

Member Since: 15 Jun 2009
Location: North yorks
Posts: 1789

2007 Defender 110 Puma 2.4 HCPU Keswick Green

Nice one Andrew

Original Member Pie n Pea Club.
110 HCPU Tipper

16th Jan 2010 4:45pm

fekete

Member Since: 24 Dec 2008
Location: Here on the other end of the computer
Posts: 3626

2007 Defender 90 Puma 2.4 HT Bonatti Grey

Great post.... explained it perfectly

NEVER TAKE LIFE SERIOUSLY. NOBODY GETS OUT ALIVE ANYWAY

16th Jan 2010 5:03pm

Grockle

Member Since: 24 Nov 2008
Location: Peak District National Park
Posts: 2266

2008 Defender 90 Puma 2.4 XS CSW Tonga Green

thanks

2.4 90 XS
1968 1/32 scale Britains 109 Pick up.

16th Jan 2010 5:16pm

K9F

Member Since: 12 Nov 2009
Location: Bournemouth
Posts: 9610

2008 Defender 90 Puma 2.4 XS CSW Stornoway Grey

Excellent!

Brilliant!

Shall print that off for further perusal so I can get it to sink into my Southern 'grey matter!' Thanks! If you go through life with your head in the sand....all people will see is an ar5e!!

Treat every day as if it is your last....one day you will be right!!

16th Jan 2010 5:32pm

jamesbond007

Member Since: 28 Oct 2009
Location: Central Algarve - Portugal
Posts: 172

2009 Defender 110 Puma 2.4 XS DCPU Rimini Red

Nice Harleys.

Now, it sounds like the ETC would compensate for the lack of axle dif? Boldly going nowhere

Discovery 3 after a Defender 110 Crew Cab TD4 and a 1964 SIIA 88 Regular.

16th Jan 2010 5:50pm

AndrewS

Member Since: 10 Apr 2007
Location: Hereford
Posts: 3707

jamesbond007 wrote:
Nice Harleys.

Now, it sounds like the ETC would compensate for the lack of axle dif?

Give that man a

Click image to enlarge

16th Jan 2010 6:01pm

jamesbond007

Member Since: 28 Oct 2009
Location: Central Algarve - Portugal
Posts: 172

Missed that one. Bought mine off the showroom without. Oh well....

Boldly going nowhere

Discovery 3 after a Defender 110 Crew Cab TD4 and a 1964 SIIA 88 Regular.

16th Jan 2010 6:12pm

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 7706

2011 Defender 110 Puma 2.4 USW Stornoway Grey

nice slides, now i wonder where they came from......

Cheers

James
110 XS Utility
130 Puma Station wagon/camper (in the making)
90 Puma Hardtop

16th Jan 2010 8:23pm

AndrewS

Member Since: 10 Apr 2007
Location: Hereford
Posts: 3707

er a friend

17th Jan 2010 12:10am

jamesbond007

Member Since: 28 Oct 2009
Location: Central Algarve - Portugal
Posts: 172

I checked all the difs on my horse this morning, they all work fine.
Of course, in a pirouette, the dif is working pretty hard. Boldly going nowhere

Discovery 3 after a Defender 110 Crew Cab TD4 and a 1964 SIIA 88 Regular.

18th Jan 2010 12:10pm

NoDo$h

Member Since: 18 Aug 2007
Location: Buried in deer guts in Dorset
Posts: 972

No TC on mine - also bought straight from the showroom

54 Freelander modded for mud
2008 D3 SE
2010 90 XS SW
1978 88 Series 3 undergoing surgery with a new owner
2007 90 County Truck Cab - gone
2006 D3 SE - gone
2004 Freelander Sport - gay
1999 Disco V8 ES rotted to bits

18th Jan 2010 11:10pm

alantd

Member Since: 14 Dec 2008
Location: Northamptonshire
Posts: 1513

2007 Defender 110 Puma 2.4 XS CSW Tonga Green

'Real' LR drivers will tell you that you don't need TC

I've got it on my current one but didn't have it on my last one. You can compensate for lack of TC by changing the way you drive and getting better at reading the conditions. TC is for people like me who are pretty rubbish

One that started out as a 2.4 TDCi 110 XS
+ New Defender 110 First Edition

22nd Jan 2010 10:46am

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 7706

alantd wrote:
'Real' LR drivers will tell you that you don't need TC

I've got it on my current one but didn't have it on my last one. You can compensate for lack of TC by changing the way you drive and getting better at reading the conditions. TC is for people like me who are pretty rubbish

or mimic its actions with a little left foot cadence as and when required. Cheers

James
110 XS Utility
130 Puma Station wagon/camper (in the making)
90 Puma Hardtop

22nd Jan 2010 2:43pm

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