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jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 7687

2011 Defender 110 Puma 2.4 USW Stornoway Grey

I am running km3s on my 130 for winter mo ths as its regularly I grassy fields, three times a week moving people.

My 110 I change from ko2s to nokian winter tyres for colder months. It goes on gravel tracks the odd maize field when cold, once a week avg but 90% time tarmac. The nokians are terrible in mud, ok on gravel, not as good as kos on gravel superb on tarmac.

As an aside run a quattro coupe on nokian winters all year round

Also as above diff lock helps massively, you will get engine braking through min each axle with it engaged. Most think of using it to keep going rather than benefits it offers for slowing. Cheers

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

16th Jan 2024 9:54am

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 7687

Nokians on 110.

Click image to enlarge

May not get them as readily now.....

Click image to enlarge

Click image to enlarge Cheers

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

16th Jan 2024 9:59am

ScarboroughSeadog

Member Since: 21 Jul 2022
Location: Scarborough
Posts: 110

2013 Defender 110 Puma 2.2 DCPU Keswick Green

jst wrote:
I am running km3s on my 130 for winter mo ths as its regularly I grassy fields, three times a week moving people.

My 110 I change from ko2s to nokian winter tyres for colder months. It goes on gravel tracks the odd maize field when cold, once a week avg but 90% time tarmac. The nokians are terrible in mud, ok on gravel, not as good as kos on gravel superb on tarmac.

As an aside run a quattro coupe on nokian winters all year round

Also as above diff lock helps massively, you will get engine braking through min each axle with it engaged. Most think of using it to keep going rather than benefits it offers for slowing.

Must say I had never considered using diff lock to assist engine braking on snow etc. As you say it should ensure both wheels on the axle are turning and assisting. Bit tricky when ice snow is patchy with firm tarmac, bu interesting point.

16th Jan 2024 12:13pm

Chicken Drumstick

Member Since: 17 Aug 2020
Location: Near MK
Posts: 543

difflock can make a noticeable difference. Engine braking is helpful as you are less likely to lock a wheel up, even if you shift down to 1st at speeds you normally wouldn't.

But difflock has another effect in snow (or mud or anything slippery). Road vehicles have a brake bias, something like a 70:30 split to the front. As under normal grippy conditions you get a lot of nose dive and weight transfer to the front axle. This helps avoiding the rear wheels locking up first.

On low grip surfaces you just don't get that same weight transfer, thus the front wheels tend to lock up early with very little braking force going on with the rear wheels. If you've seen someone skidding on snow or in YT videos, you'll note the rear wheels are nearly always turning, even if the fronts are locked. Or with ABS cars, the fronts are pulsing, but the rears rotate more. ABS is worse in a way as it'll kick in even earlier. All this amounts to very little braking ability, as the fronts aren't stoping you very well and almost no braking is happening at the rear.

With a 4x4 with difflock (or a 2wd/4wd transfer case). When in 4wd it locks the front and rear axles together giving you a 50:50 brake bias instead of 70:30. This firstly allows the rear brakes to do a lot more braking and will also help prevent the fronts locking up/ABS activating as early. Overall is shorter quicker stopping distances.

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16th Jan 2024 12:57pm

ScarboroughSeadog

Member Since: 21 Jul 2022
Location: Scarborough
Posts: 110

This is brilliant stuff. A (mechanical) diff lock effectively gives 50/50 brake bias. Very useful to know!!

16th Jan 2024 1:20pm

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 7687

ScarboroughSeadog wrote:
jst wrote:
I am running km3s on my 130 for winter mo ths as its regularly I grassy fields, three times a week moving people.

My 110 I change from ko2s to nokian winter tyres for colder months. It goes on gravel tracks the odd maize field when cold, once a week avg but 90% time tarmac. The nokians are terrible in mud, ok on gravel, not as good as kos on gravel superb on tarmac.

As an aside run a quattro coupe on nokian winters all year round

Also as above diff lock helps massively, you will get engine braking through min each axle with it engaged. Most think of using it to keep going rather than benefits it offers for slowing.

Must say I had never considered using diff lock to assist engine braking on snow etc. As you say it should ensure both wheels on the axle are turning and assisting. Bit tricky when ice snow is patchy with firm tarmac, bu interesting point.

It won't ensure both wheels on same axle are doing same. It will give you equal braking front to back, or equal rotational force on each axle. Cheers

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

16th Jan 2024 2:51pm

Inguz

Member Since: 06 Sep 2020
Location: In the wild
Posts: 96

I have KM3's on my TD5 and they just suck on thin layers of snow. Once the snow gets to about a foot they are excellent. I find it frustrating because I need to drive on thin layers to get to the deep stuff, and there are not many to match their ability offroad.

However, they are rated as all season and M&S, but I guess that doesn't apply to paved surfaces.

16th Jan 2024 2:57pm

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 19578

Nokians have a big following I believe.

Really the jist is the compacted snow on roads is compacted into ice and as such whatever tyres you have it will be underlying ice that’s the real issue most.
Often it gets compacted, then frozen instantly or over night breaking off the contact between tyre and road surface.
I guess spikes would be useful, but they aren’t allowed I believe at least not here.
Chains would be useful in super deep snow, wouldn’t be going far if it was that bad anyway. Diesel$ Live$ Matter. ⛽️🛢️👨‍🔧🧰⚙️ RED, WHITE & BOOST! 🇬🇧

16th Jan 2024 7:28pm

Chicken Drumstick

Member Since: 17 Aug 2020
Location: Near MK
Posts: 543

I'd love to live somewhere where we get enough snow to warrant proper winter tyres. But in my experience (home counties and nearby areas). Any snow we have just doesn't last long enough to get iced, frosted or compacted.

Most roads are gritted these days. And when we do get snow, the majority of routes get cleared fairly quickly, even if just by the sheer number of cars running on it. The snow sometimes only lasts that day before melting and even on the odd occasion it stays for a few days, it is only during the snowfall and immediately afterwards that the roads are covered.

Years back my Uncle used to snow plough for the local council:

But it must be 30 years since this happened and I don't recall seeing another other snow ploughs in our area in the past 3 decades.

These days we only seem to get a dusting, note that while everything looks white. The roads are completely clear!

Even if it snows at night in a lowish traffic area that isn't gritted, the roads clear quickly when a vehicle runs over it.

Don't get me wrong, we have had more snow, although not for a while. And when it does snow there are always plenty of prats about. One of my things is to get up, chuck the tow rope in the back and head out. I'll drive all round the area including the steepest hills. Help a few people here and there. Never yet felt the need for chains, studded tyres or even full winters. Have always been able to get about in a 4x4 on MTs or ATs.

16th Jan 2024 8:05pm

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 19578

Getting around is the easier part though, it’s stopping that’s the thing to be more careful of.

And of course other traffic. Diesel$ Live$ Matter. ⛽️🛢️👨‍🔧🧰⚙️ RED, WHITE & BOOST! 🇬🇧

16th Jan 2024 9:27pm

L110CDL

Member Since: 31 Oct 2015
Location: Devon
Posts: 10513

Thanks for the pic's Chicken Drumstick

Loving the Merc snow plough, my reed supplier has one of those but his one is all kitted up for spraying fields

1996 Golf Blue 300Tdi 110 Pick up. Keeper.

Clayton.

18th Jan 2024 10:18pm

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