Why can nobody drive in the snow

Why can nobody drive in the snow

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Onehp

1,617 posts

284 months

Thursday 24th January 2019
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Car-Matt said:
CABC said:
Car-Matt said:
300bhp/ton said:
Car-Matt said:
Can't see it, AutoExpress block adblockers. If it's a dumb 4x4 on summers vs 2wd on winters pointless test. Then all I can say is REREAD the posts above.... and lookup the word "equal" .... lol

wink
Probably best to watch it before being a sarcy twunt, it shows all combos of 4x4/2wd/Summer/Winter and links to a braking test too.

;-)
to be fair it is the "usual" comparison. I don't think the Kuga has a locked centre diff. Crossovers drive like FWD cars in cornering and braking (i think**)
TBF i think its representative of the vast majority of 4x4 cars on the road (300bhp/ton will carry on arguing as he is a landrover enthusiast and therefore will only consider 'proper' 4x4's however these make up a tiny proportion of whats on the roads), and yes the video shows the usual comparison but also shows the other combos too. I made no comment or claims about the results, just shared it for people to see what happens.
My comment is that this is actually mostly a test for the electronics and since these are the same cars, a fair test. True center locking diff doesn't matter really in these conditions as most modern 4wd will lock their center diff (Audi, Subaru etc) or fully engage their clutch(Haldex, xdrive, Porsche, GT-R, Merc etc) in these conditions, i.e. a pure traction test. And as such represent most 4wd cars. Only old quattro or Fiat pandas with viscous locking diffs wont match the front and rear axle speeds and will fall behind. Its first in more dynamic high grip situations that the differences in 4wd architecture influence on the limit handling.

PS: front or rear locking diffs might also help traction, delaying the use of brakes and especially effective in split friction...

Integroo

11,574 posts

86 months

Thursday 24th January 2019
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ToothbrushMan said:
and dont you just love weathermen who after announcing snow and ice saying "but dont venture out in your car unless your journey is absolutely necessary".

no, my journey is totally unnecessary I just thought I would drive around aimlessly for a bit until I got bored.
Plenty of people drive in the snow when they don't need to. I had to dig my boss out after he gave me a lift home during the heavy snow last year. He could easily have got the subway to work, or walked, or worked from home.

Alpinestars

13,954 posts

245 months

Thursday 24th January 2019
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Car-Matt said:
That’s not a permanent 4wd car. By the time the 4wd kicked it, it was stuck.

Balmoral

40,942 posts

249 months

Thursday 24th January 2019
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RicksAlfas said:
Balmoral said:
300, I grasp both your points there, thanks.
If everyone said that, the internet would be much smaller.
biggrin
But, having given it further thought and not disagreeing with the advantages, surely that's still a function of 4wd's superior traction under acceleration and deceleration, and not grip. The brake bias bit I understand too, and it's also likewise for weight transfer, but that's going to be the same for all cars surely?

300bhp/ton

41,030 posts

191 months

Thursday 24th January 2019
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CABC said:
to be fair it is the "usual" comparison. I don't think the Kuga has a locked centre diff. Crossovers drive like FWD cars in cornering and braking (i think**)
And there are different ways to corner. Simply going to fast and turning the steering wheel isn't going to give good results, however downsting, making use of the traction and setting the car up for the corner by altering the yaw angle/attitude of the car, such as slightly invoking the back end out a bit, will allow you to corner quite differently.

I'm not saying we all need to drive like Ari Vatanen. As you should still be going at a slow to moderate speed, not flat out. But it will make a big difference. A bit of left foot braking or a flick on the steering wheel or even a bit of handbrake can help a lot. Some of these things are harder to do in modern cars with electronic handbrakes or electronics that won't let you use the brake and accelerator at the same time. But you just adapt to the car and conditions.

Onehp

1,617 posts

284 months

Thursday 24th January 2019
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Thesprucegoose said:
The snow always brings out the driving gods. I was taking it steady up a hill when this winter clad tyre car overtook me. It was funny really as the next bend he was in the ditch. Same thing as a Landy in a ditch, but that was ice.

I actually think a lot can drive ok in snow, slow and steady wins the race. But the winter tyres brigade love the 2 days of snow we get so they can statistics there purchases.
Good point, slow ain't bad.

Actually the worst scenario is that roads become slippery locally and suddenly. This can be rain turning to ice on a cold surface, or also snow that is packed to ice, usually happens in places already dangerous.
Or simply snow and an incline. Upwards some driver ability can help with momentum, downhill even the best driver can become a passenger...

For these secnarios, a summer tyred vehicles becomes completely helpless and a danger. A winter tyred car will have *some* grip. Or should I say, All Season?

But in the end, it's always the driver and their decisions that cause crashes... On summers, that can be the decision to drive at all...


Edited by Onehp on Thursday 24th January 13:26

300bhp/ton

41,030 posts

191 months

Thursday 24th January 2019
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motco said:




And your point is what? That you can do some googling????

Last pic isn't even winter, let alone snow FFS. And the first the road is clear, so unless it was you, we don't know the cause of the accident.

Tired

259 posts

64 months

Thursday 24th January 2019
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300bhp/ton said:
And there are different ways to corner. Simply going to fast and turning the steering wheel isn't going to give good results, however downsting, making use of the traction and setting the car up for the corner by altering the yaw angle/attitude of the car, such as slightly invoking the back end out a bit, will allow you to corner quite differently.

I'm not saying we all need to drive like Ari Vatanen. As you should still be going at a slow to moderate speed, not flat out. But it will make a big difference. A bit of left foot braking or a flick on the steering wheel or even a bit of handbrake can help a lot. Some of these things are harder to do in modern cars with electronic handbrakes or electronics that won't let you use the brake and accelerator at the same time. But you just adapt to the car and conditions.
Is this a serious post?

On the road, in the snow, at low to moderate speed, we should all be doing scandi flicks and using the handbrake, trail braking into corners to get some oversteer etc.

300bhp/ton

41,030 posts

191 months

Thursday 24th January 2019
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Car-Matt said:
TBF i think its representative of the vast majority of 4x4 cars on the road (300bhp/ton will carry on arguing as he is a landrover enthusiast and therefore will only consider 'proper' 4x4's however these make up a tiny proportion of whats on the roads), and yes the video shows the usual comparison but also shows the other combos too. I made no comment or claims about the results, just shared it for people to see what happens.
So what are the "vast" majority of 4x4's on the road?

Toyota, Nissan, Mitsubishi, Jeep or whatever doesn't fundamentally differ from many of the LR products in terms of basic AWD operation.

And cough cough...







Onehp

1,617 posts

284 months

Thursday 24th January 2019
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Alpinestars said:
That’s not a permanent 4wd car. By the time the 4wd kicked it, it was stuck.
Modern 4wd clutch systems will close clutches very quickly and preemptively even, permanent 4wd is overrated. See also my above longer post.



300bhp/ton

41,030 posts

191 months

Thursday 24th January 2019
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rallycross said:
He came out with the same ste last year and the year before the best thing to do is ignore posts about tyres by 300 he’s full of crap and won’t listen to anyone.
You are a rude fella aren't you. Why must you always throw insults out?

Alpinestars

13,954 posts

245 months

Thursday 24th January 2019
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Onehp said:
Alpinestars said:
That’s not a permanent 4wd car. By the time the 4wd kicked it, it was stuck.
Modern 4wd clutch systems will close clutches very quickly and preemptively even, permanent 4wd is overrated. See also my above longer post.
They may well do that. But that’s the reason the awd didn’t get further up the hill.

Balmoral

40,942 posts

249 months

Thursday 24th January 2019
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All things considered, I think I'd like to be in a Panda or Justy 4wd with some extra extra skinny winter tyres.

ATG

20,616 posts

273 months

Thursday 24th January 2019
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The only thing stopping me from driving in the snow is the distinct lack of any snow to drive in. I had to find an ancient hump backed bridge over a small river before I could lose traction unprovoked (ahem) and kick the back out a little.

Given the time of day I drive, either 4:30am or midnight, the rural roads I use are generally deserted, so when there is some snow it is generally entertaining and perfectly easy to negotiate. Black ice is much more of a worry.

Edited by ATG on Thursday 24th January 13:46

Onehp

1,617 posts

284 months

Thursday 24th January 2019
quotequote all
Alpinestars said:
Onehp said:
Alpinestars said:
That’s not a permanent 4wd car. By the time the 4wd kicked it, it was stuck.
Modern 4wd clutch systems will close clutches very quickly and preemptively even, permanent 4wd is overrated. See also my above longer post.
They may well do that. But that’s the reason the awd didn’t get further up the hill.
You might be technically correct that a permanent 4wd car will have been higher up the hill, however the reason it gets stuck are the inappropriate tyres.

At best, it might have been a few feet higher up accounting for marginal higher momentum from a better start with true 4wd in the initial first second or so, a marginal difference at best and completely unhelpful for the task at hand, unless your driveway was thas feet longer perhaps...

Overall, I think your comment is a perfect illustration of how much drive is overrated...

300bhp/ton

41,030 posts

191 months

Thursday 24th January 2019
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Thesprucegoose said:
slow and steady wins the race.
Off road one of the golden rules is usually "as slow as possible as fast as necessary".

This is because sometimes you do need to go faster or require more momentum. Likewise there are also times when locking up or spinning a wheel or giving the steering wheel a flick are also advantageous.

Also on the road network, people usually need to get places. You might have all day to do 2 miles to shop down the road, so don't mind running at 5mph at ticker over in 1st or 2nd. But other people might have 30+ miles to go and simply don't have the time to drive that slowly, e.g. 30 miles at 5mph would take 6 hours!!!

If you know the roads/area, then on straight bits of roads with no or few turnings and in good visibility you can run a lot quicker. As all you'll need to do is slow in a straight line and you can see plenty far enough for this. For bends, corners, junctions or other potential hazards you'll want to slow up but only to the speed that the grip level permits, you usually don't need to come to walking pace.

One of the most annoying things about getting about in the snow is people running slowly. Often on cleared roads where there is only snow either side of the road or very occasionally in the middle where they aren't driving anyhow. In these conditions the tarmac is just cold and wet and has the same grip/traction as any other cold and wet day. Where people would normally be tearing about.

Alpinestars

13,954 posts

245 months

Thursday 24th January 2019
quotequote all
Onehp said:
Alpinestars said:
Onehp said:
Alpinestars said:
That’s not a permanent 4wd car. By the time the 4wd kicked it, it was stuck.
Modern 4wd clutch systems will close clutches very quickly and preemptively even, permanent 4wd is overrated. See also my above longer post.
They may well do that. But that’s the reason the awd didn’t get further up the hill.
You might be technically correct that a permanent 4wd car will have been higher up the hill, however the reason it gets stuck are the inappropriate tyres.

At best, it might have been a few feet higher up accounting for marginal higher momentum from a better start with true 4wd in the initial first second or so, a marginal difference at best and completely unhelpful for the task at hand, unless your driveway was thas feet longer perhaps...

Overall, I think your comment is a perfect illustration of how much drive is overrated...
My comment is based on the conclusions of the makers of the video.

Onehp

1,617 posts

284 months

Thursday 24th January 2019
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Alpinestars said:
My comment is based on the conclusions of the makers of the video.
Indeed, would say that comment is incorrect, already on the slope the electronics already know that the traction is limited and the centre clutch is closed already. Also the car slithered backwards (all four wheels locked) to a point lower than the 2wd car. Courtesy of the higher weight probably I would add.

Maybe take Matts conclusion to heart: "without the right rubber, a 4wd car is just as useless as a 2wd car" ...

Graveworm

8,497 posts

72 months

Thursday 24th January 2019
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Onehp said:
Indeed, would say that comment is incorrect, already on the slope the electronics already know that the traction is limited and the centre clutch is closed already. Also the car slithered backwards (all four wheels locked) to a point lower than the 2wd car. Courtesy of the higher weight probably I would add.

Maybe take Matts conclusion to heart: "without the right rubber, a 4wd car is just as useless as a 2wd car" ...
The right tyres make all the difference but awd does help. Unless truly coasting it can spreadi the engine drive/Braking across up to twice the area and doubles the opportunity to find traction. In some cases it improves braking but I think that was over rated, in the tests, based on the vehicles that were used.

Sheepshanks

32,806 posts

120 months

Thursday 24th January 2019
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Onehp said:
Maybe take Matts conclusion to heart: "without the right rubber, a 4wd car is just as useless as a 2wd car" ...
My wife's Tiguan has 4Motion and winter tyres - in the icy snow we've had in the last couple of days it's still pretty iffy braking and cornering, on flowing bends the car was still going sideways at very low speed.

The thing it's great at is pulling away from rest in a straight line - even pretty firm acceleration didn't break traction. If all winter tyred vehicles are like that it's easy to imagine why their drivers get caught out.