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D4 , snow and ABS
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jamesSE4x4R
 


Member Since: 09 Mar 2016
Location: kent seaside
Posts: 176

United Kingdom 2014 Discovery 4 3.0 SDV6 HSE Lux Auto Sumatra BlackDiscovery 4
D4 , snow and ABS

chaps

having driven my D4 in the snow im wondering if its possible to turn off the ABS at all to aid braking.. grip and go isn't an issue but i nearly SH**T myself when i tried to stop!
it was in the snow special setting but it didn't help with braking.
 www.southeast4x4response.org.uk Responder of 9 years service SE140
Ex defender 50th owner, GB165
2010 MY XS -sold
2014 MY HSE Lux curent
2017 MY Disco Sport (wife's)
" if it fly's, floats, is fast or fornicates you can't afford it my boy" RIP Gramps 2009 
 
Post #188484129th Nov 2017 3:01 pm
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adam
 


Member Since: 20 Sep 2005
Location: Home and Happy
Posts: 6917

United Kingdom 

Don't think you can overcome the laws of physics

In the last big snowfall of 2010 mine did a great impression of a near 3 ton torpedo as it slammed into my parents hedge when I braked and the car decided it didn't want to stop
  
Post #188485029th Nov 2017 3:33 pm
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Jubbly
 


Member Since: 20 Nov 2016
Location: Stourbridge
Posts: 401

United Kingdom 

thats why winter tyres are good, even for the uk, stopping distance in snow/cold are reduced. Thumbs Up
 Jaguar I-Pace HSE imminent.
Gone HSE with Flappy Paddles. IID BT tool. RLD Spare Protector, Altox GPS.

 
 
Post #188485629th Nov 2017 3:42 pm
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lespes
 


Member Since: 17 Sep 2009
Location: Sitting Down
Posts: 2231

Guernsey 2016 Discovery 4 3.0 SDV6 Landmark LE Auto Santorini BlackDiscovery 4

ABS cannot be turned off Thumbs Up
 D4 Landmark MY16 Santorini Black THE LAST
D4 HSE MY12 Marmais Teal: Gone. Missed a lot!
Freelander 2 SD HSE MY11 Silver:Thankfully gone.
D4 HSE MY11 Silver: Gone missed !
Range Rover Sport MY06 HSE Buck Blue: Gone missed!
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Post #188487629th Nov 2017 4:52 pm
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Gareth
Site Moderator 


Member Since: 07 Dec 2004
Location: Bramhall
Posts: 26683

United Kingdom 

I'm with Adam on this. All cars have 4 wheel stop! If the roads slippy, it's going to take longer.

The Discos only trick is HDC, which is very effective at slowing the car on an icy hill if the laws of physics allow.

HDC on, let the system take you down the hill, keep foot off the accelerator, cover the brake. Control your speed with the cruise control speed up/down button on the steering wheel. Press the speed minus button until car is almost stopped, then apply foot brake to bring to final halt. However, if it is real sheet ice, even this will turn your car into a 3 ton runaway. If it does runaway, at least the wheels will be turning, giving you some degree of directional control until you either arrest the skid, or hit something.

The last thing you want is locked wheels, as the car will just skid straight, no matter what your steering input is.
  
Post #188488729th Nov 2017 5:30 pm
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Philip1972
 


Member Since: 10 Mar 2017
Location: Gloucestershire
Posts: 1072

United Kingdom 2011 Discovery 4 3.0 SDV6 GS Auto Zermatt SilverDiscovery 4

Is one of the "terrain" thingies for snow?
  
Post #188489529th Nov 2017 6:20 pm
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Hardware
 


Member Since: 28 Jun 2016
Location: Hiding under the M60
Posts: 12676

United Kingdom 2011 Discovery 4 3.0 SDV6 XS Auto Sumatra BlackDiscovery 4

I think what jamesSE4x4R is getting at is there is a point where the locked-up wheels can create a wedge of snow in front of them that can slow you down better ... not sure I'd like to be in a position where that is what I'm relying on, given few of us will get opportunity to practice this art.
  
Post #188489829th Nov 2017 6:22 pm
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stick
 


Member Since: 13 Jan 2010
Location: hants
Posts: 592

United Kingdom 2010 LR4 3.0 TDV6 HSE Auto Izmir BlueLR4

would add to Gareth's comments, if the hill is really icy, then select low range before you start, will hold you at lower speed. First gear might be too slow and run risk of sliding away so use 2nd. It is still possible for all 4 to lock up, if you start to slide, give it a few revs to get all the wheels turning again before taking foot off and hoping car can do its stuff.....

...new trousers not compulsory...mine has taken me down hills in Switzerland (with winter tyres) that I absolutely could not stand on.

OP was more about stopping in normal driving. Try a few slowing manoeuvres where there is nothing to hit so you can assess your tyres and grip, and then go slow if there might be any reason to stop. Discovery's are great at starting and driving with GGS, it is stopping a 3t sledge that is the worry.
 d4 HSE  
Post #188490329th Nov 2017 6:45 pm
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jamesSE4x4R
 


Member Since: 09 Mar 2016
Location: kent seaside
Posts: 176

United Kingdom 2014 Discovery 4 3.0 SDV6 HSE Lux Auto Sumatra BlackDiscovery 4

Chaps, to clarify

The vehicle is running all weather durartrac's ( with the snowflake and mountain symbol )
I am well aware of the laws of physics, I was an ARDS instructor for many years and taught driving dynamics for BMW, Caterham, Vauxhall and many others so I am well versed to the effects of weight distribution and point loading in limited traction conditions.

As one of you has pointed out in certain circumstances locking up the wheels does cause a wedge of snow infront of the tyre that aids braking but my real issue with the D4 is that even if one wheel looses traction and locks up the electronic response is to give me the abs "fart", the pedal goes soft and to the floor and from there on in you become a passenger..
I have owned lots of defenders, a D1, D2 and dare I say it several japanese off roaders so again im well used to how they all perform in the snow HOWEVER the D4 is by far and away the best at getting through snow but at the same time by far and away the worst at stopping in it!

To my shame I have never played with the HDC, ive always used low box if required which has been sufficient but I would have thought selecting snow on the TR system would have tamed the overly aggressive ABS..
 www.southeast4x4response.org.uk Responder of 9 years service SE140
Ex defender 50th owner, GB165
2010 MY XS -sold
2014 MY HSE Lux curent
2017 MY Disco Sport (wife's)
" if it fly's, floats, is fast or fornicates you can't afford it my boy" RIP Gramps 2009 
 
Post #188510330th Nov 2017 10:13 am
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al cope
 


Member Since: 08 Nov 2005
Location: Oldbury, WM
Posts: 10289

England 

and has been said, engage HDC before going own the hill, not as I tried a couple of years back once halfway down, as the HDC speed was below what I was traveling at by then it locked the wheels for a second in trying to slow me down, which produced a slide. Defo brown trousers job.

Al
 Volvo XC90 B5 Plus Dark
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Post #188512430th Nov 2017 11:28 am
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Gareth
Site Moderator 


Member Since: 07 Dec 2004
Location: Bramhall
Posts: 26683

United Kingdom 

I've never tried it in snow, but perhaps if you turn off the DSC it would moderate the abs? It certainly moderates the tc in muddy conditions and allows a lot more energetic progress through tricky conditions.
  
Post #188515830th Nov 2017 1:58 pm
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lespes
 


Member Since: 17 Sep 2009
Location: Sitting Down
Posts: 2231

Guernsey 2016 Discovery 4 3.0 SDV6 Landmark LE Auto Santorini BlackDiscovery 4

Duratracs may have snowflake symbol and perform well in snow but........ not that great in icy conditions.

Driving in manual mode using flappy paddles gives a little more engine braking.

Pretty certain from memory that HDC is automatically engaged when in snow mode
 D4 Landmark MY16 Santorini Black THE LAST
D4 HSE MY12 Marmais Teal: Gone. Missed a lot!
Freelander 2 SD HSE MY11 Silver:Thankfully gone.
D4 HSE MY11 Silver: Gone missed !
Range Rover Sport MY06 HSE Buck Blue: Gone missed!
Discovery D2 TD5 Facelift MY Red Gone Missed!
Discovery D2 TD5 Cobalt Blue: Gone Missed!
Discovery D1 Auto Oxford Blue Not missed at all!
Discovery D1 Avalon Blue First LR! missed!

Now demoted to a VW 
 
Post #188516730th Nov 2017 2:17 pm
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