On Fri, 12 Jan 2018 10:54:44 +0000, The Other Mike wrote:
Diffs are funny things, multiple diffs are just plain weird.
In the below:
"traction" - Wheel is not slipping/spinning.
"drive" - Abilty to move.
I'm about 85% certain this is what happens with various drive and
diff lock arrangements:
2WD un locked diff, one wheel loses traction, the other stays still,
2WD locked diff, both wheels are locked together and rotate at the
same speed. If one loses traction, hopefully the other will still
have traction and you'll have drive.
4WD un locked diffs. One wheel loses traction, you lose traction for
that axle. The other axle still has drive.
4WD locked center diff. Both axles are locked and rotate at the same
speed, note axle not wheel. A single wheel can lose traction and the
other three wheels retain drive. Both wheels on the same axle can
lose traction the other axle retains drive. If diagonal wheels loose
traction, you loose drive at the other two wheels.
4WD center and axle diffs locked. Everything (axles and wheels) goes
round at the same speed, wether any given wheel has traction or not.
This can give you one wheel drive...
With a diff locked there is a risk of "transmission wind up" that can
lead to broken half shafts or stripped diff gears. You should not
lock diffs unless the surface is slippy enough to allow the wheels to
rotate at different speeds, as they must do, as you go around
This is one of the weird bits. Doesn't the stationary wheel with
traction but no drive limit the rotation of the input shaft to that
Again related to the weird behaviour with traction but no drive
I shall have to find my Lego Technik model and have a play again.
Center diff lock light? IIRC the lock is a dog clutch and can stick,
particulary if there is any transmission wind up. Always worth
driving straight for a few tens of yards and then backwards and
forwards a few times after when disengaging.
If it is steep neither. I have noticed that in for example ski resorts
the roads are never that steep, and that winter tyres fitted to hire
cars have been all that I need. Last year I failed to make a right turn
on a local road because my car would not slow down. This year I have
decided to use winter tyres, on a separate set of rims. I plan to keep
the car for more than 10 years - if I last that long.
On Thu, 11 Jan 2018 10:50:28 +0000, Another John wrote:
Best car in snow I've driven was a Moggie Minor van.
Very light, rear wheel drive and narrow tyres which dug in.
Sailed past bigger cars trying to get up hills.
I had a set of snow chains for the Peugeot 504 Estate and with them on it
was marvellous in snow. A lot of satisfaction gained from pulling a Volvo
Estate out of a ditch. However they took a long time to get on and off. On
snow you could do 50 mph and on tarmac 20 mph. I only needed them for the
last couple of miles because we lived on the side of a steep hill and once
it snowed you couldn't get in or out in an average car.
Pain in the arse having to stop as soon as you hit the main road to take
them off again. Especially kneeling in the slush with your hands freezing.
I've just fitted some Nokian all weather tyres to the VW Touareg in
anticipation of a harsh winter but haven't needed them yet. The main thing
seems to be the tread pattern, and the fact that it goes around the edge
of the tyre towards the sidewall so there is more grip once the tyre sinks
into the sticky.
You might look at getting narrower tyres for the Panda because hopefully
they would be quite cheap.
AMD FX-6300 in GA-990X-Gaming SLI-CF running Windows 7 Pro x64
<snip> >Best car in snow I've driven was a Moggie Minor van.
Funny, I've just said the same elsewhere. ;-)
There weren't many other cars (or hills) about the time I took the van
for a play in the proper snow so I couldn't really compare.
I did see a big 4x4 (possibly a RR) beach itself on the central
reservation when trying to do a U turn on a blocked dual carriageway.
On Thursday, 11 January 2018 10:50:31 UTC, Another John wrote:
I can't answer your specific question, but I do recommend a watch of the ex
cellent test that AutoExpress did to evaluate the effect of winter tyres.
They took a couple of Ford Kugas (one 2WD and one 4WD) up an indoor ski slo
pe, with a variety of different tyres.
On Fri, 12 Jan 2018 13:10:05 +0000, The Natural Philosopher
BIL took us in his Disco to an off-road event in Abingdon a few years
ago. This wasn't us but this was the track:
At the gate there was a sign that said 'No Freelanders' ;-)
There were all sorts of (4x4) vehicles going round, possibly including
Freelanders so it may have just been an 'in joke'?
We didn't get stuck once (2L auto, no difflocks, stock tyres) but we
did ground the towbar out a couple of times.
We also did the mud splash at the end and it actually covered the
bonnet and was up to the door handles. ;-)
Nephew insisted they just cleaned off the lights and number plates
and BIL had to leave it like that for a couple of weeks. ;-)
The real shame was that I believe that even was the first and last
time it was ever really taken off road (in his ownership at least).
Cheers, T i m
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