Member Since: 03 May 2016
Location: Kent
Posts: 1521
HDC down icy hill?
Hello all
Last Winter I had to drive in some icy conditions on one night. There is a lengthy downhill run coming into the town I live in and my scorpion zeros did not give me any confidence . I need some advice on HDC in case the same happens this year.
I contemplated using HDC on this icy hill, but chose not to and apply the brake manually as I could control the brake myself rather than it being applied automatically for me. What is the considered opinion on using HDC on an icy 400m run downhill? Gradient varies , not excessive but not a gentle incline (makes you puff walking up it).
Member Since: 06 Mar 2017
Location: Lost
Posts: 4654
What speed were you doing at the time? This will have very significant influence on the HDC behavior as it would in normal driving mode!yµ (idµ - eAµ) ψ=mψ
29th Nov 2018 3:13 pm
omg!
Member Since: 01 Jun 2011
Location: Fife
Posts: 569
HDC is MUCH better than you are using your footbrake.
It adjusts the braking to each wheel independently as needed and stops you skidding off into the scenery.
If you apply the brakes you apply them all at the same time and although you have ABS the HDC computer does it far better.
29th Nov 2018 3:36 pm
robpenrose
Member Since: 12 Jan 2016
Location: Surrey / SW London
Posts: 2136
I came down something really steep when it was icy last year and we had all the snow. To the point i didn't want to drive down it at all, but the road was blocked at the top with a 6ft snow drift, so i had no choice. I shouldn't have listened to Google Maps when in the Cotswolds and bad snow!
Anyway, i used low range, locked in gear, HDC and controlled the speed with the foot brake as well. Whatever you do, you need to be very smooth so you don't lose grip in the first place.
It was a long straight steep steep hill. Car never struggled. I was on GG AT
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Remember you can control the hdc speed with the cruise control buttons. .
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29th Nov 2018 4:08 pm
stew 46
Member Since: 01 Dec 2011
Location: cornwall
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Used mine coming down a mountain gravel track in Spain VERY VERY steep I s t my pants but the HDC worked perfect it was so steep my mate got out at the top and walked down because he didn't think we would make it -------------------------------------------------
if you cant hold on dont let go , it ill come in handy for something even if you never use it.
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29th Nov 2018 4:20 pm
Ken
Member Since: 20 Feb 2006
Location: Here
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Get some Winter Tyres worth every penny in those conditions although I run winters on my RWD M2 from Oct to April in Snow it puts the AWD brigade in there place
Its a Picture going past people in snow in a RWD BMW
29th Nov 2018 4:53 pm
Canburne
Member Since: 15 Jan 2013
Location: Devon
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All you have to do is go on the LR Experience course and they demonstrate exactly how it works. .
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29th Nov 2018 4:53 pm
LT
Member Since: 31 Dec 2005
Location: South West
Posts: 23366
I used HDC on my D3 to go down a steep hill that was virtually sheet ice. I had the original fit Pirelli Zero’s on. I used the CC to set HDC to the lowest possible speed and kept everything crossed.
It was amazing, totally effortless. 2006 D3 HSE (Original & still the best)-GONE
2010 D4 HSE (A bit bling)-GONE
2014 D4 HSE (Almost too bling)-GONE
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29th Nov 2018 5:19 pm
DG Site Moderator
Member Since: 12 Dec 2005
Location: The Gaff
Posts: 50934
Ultimately, gravity is king, so when you are sitting your 2.7 tonne box...never forget that. HDC and steering can always be lost on ice or other slippery surfaces as I have found to my cost
Primary considerations for me would be...
a/ tyres, as Ken says ...winters make such a difference on ice\snow.
b/ steepness and run out ...once you are committed where are you going to go if it all goes pear shaped ? off the edge of a cliff ...or a nice sized verge. If in doubt ...get out and assess.
c/ is there another way?
29th Nov 2018 5:26 pm
DSL Keeper of the wheelie bin
Member Since: 11 May 2006
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We talking re that hill decent at Boughrood?
29th Nov 2018 5:28 pm
DSL Keeper of the wheelie bin
Member Since: 11 May 2006
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Posts: 72787
DG wrote:
get out and assess.
Oh er Mrs Jones.
29th Nov 2018 5:29 pm
LT
Member Since: 31 Dec 2005
Location: South West
Posts: 23366
I did have a snow covered verge that I might have been able to stop on if it had gone pear shaped.
It was my first winter in the D3 and I was pretty nervous, but it crawled down with no drama. I’ll never forget it. 2006 D3 HSE (Original & still the best)-GONE
2010 D4 HSE (A bit bling)-GONE
2014 D4 HSE (Almost too bling)-GONE
2015 D4 HSE (A heated what?)-GONE
2016 D4 Landmark (Written Off)-GONE
2016 D4 Landmark (Surely the last!) PD1881 rims-GONE
2017 FFRR SDV8 Autobiography
29th Nov 2018 5:37 pm
DG Site Moderator
Member Since: 12 Dec 2005
Location: The Gaff
Posts: 50934
DSL wrote:
We talking re that hill decent at Boughrood?
Yes that hill descent ...the one where the tree saved me
isn't it the best practice to actually go a bit faster on an icy slope so that you retain come control? if you go too slow, you might end up just sliding around?--
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... All LED interiors lights, DRLs, Spare Wheel protector.
t my pants but the HDC worked perfect 
it was so steep my mate got out at the top and walked down because he didn't think we would make it 
