How many traction options should you have ?

Sub Title - Don't you love it when 4wd theory just works out the
way its supposed to !


I headed down a ridge on the weekend on a dead end track
knowing that the only way out was the way in and that the track was
a moderate downhill slope of about 20 degrees.

Considering the heavily forrested track was damp I couldn't
be confident of calling it but figured I had a 50/50 chance.

So you evaluate your options on the way down and tick off
the actions you may need to take.

Being alone I figured there were 5 steps I could take if
I couldn't make it back.


1/ Engage Locker

2/ Drop tyre pressures

3/ Make a cup of Coffee

4/ Fit chains

5/ Winch.

5 Plus, Make another cup of coffee - and as Bear says, cool it and think.


So we are now heading back up the 1km track.
I'm in my automatic 4800 GU Patrol with my D693 dueller road tyres on
and pressures are around 20 psi.

More than 1/2 way up now, driving slow and steady so as not
to break traction.

Things are looking good, I should make it, there is just
one little steeper washout ahead.

Up we go and the slipping starts and sure enough we stop.

No big deal, reverse back down 10 meters, engage the front
locker and head up again but with a bit more speed.

3 meters past the first slipping point and we progress no more.

This time things are a little more awkward as the car
starts the dreaded backwards downhill slide, but its only
a couple of meters before it stops.

The tree behind me looks a little dissapointed at not scoring the
first dent on this car.

Ok, option 1 has failed so we are into option 2.
This requires getting out and dropping tyre pressures to 12 psi.

Off we go again and this time we sail straight up with
almost no wheel spin at all, amazing.

The simple reduction of tyre pressures right down worked
just like it is supposed to.
Robin Miller

Member
My Profile  Send Message

Back Expand Un-Read 0 Moderator

Reply By: Berniec - Monday, Jun 27, 2011 at 11:06

Monday, Jun 27, 2011 at 11:06
Nice to try out something a bit extreme and succeed. Its not the kw's its getting it to the ground.
How far would you be prepared to reduce tyre pressure without damaging the wall or breaking the bead?
AnswerID: 458552

Follow Up By: Robin Miller - Monday, Jun 27, 2011 at 11:48

Monday, Jun 27, 2011 at 11:48
Hi Berniec

On this track section which had no bouncy bits or rocks I would have gone to 8psi min.

I do love the bit of excitment of going in with an unsure outcome and seeing the bits one has put in place doing their job.
Robin Miller

Member
My Profile  Send Message

0
FollowupID: 732063

Follow Up By: ross - Tuesday, Jun 28, 2011 at 12:34

Tuesday, Jun 28, 2011 at 12:34
Ill go down to whatever pressure I need to get a vehicle out safely,I had the landcruiser B/stone d694 down to 7psi on the beach.
Tyres are cheap and you can put them back on the rim if you have to.

I always laugh at those who tell me how they need a 350 CHEV V8 minimum in their landcuiser/patrol or it wont have enough power for 4wding
0
FollowupID: 732168

Reply By: wizzer73 - Monday, Jun 27, 2011 at 11:09

Monday, Jun 27, 2011 at 11:09
you'll have to go back there with someone who has a car with all the bells and whistle traction control aids and do a comparo. may be surprising to see the results.

wizzer
AnswerID: 458553

Follow Up By: Robin Miller - Monday, Jun 27, 2011 at 11:54

Monday, Jun 27, 2011 at 11:54
I would dearly love to do more of that Wizzer , we have beaten off a couple in the past but none of the post 2005 generation and there is nothing like a direct comparo on the day.

We are only 90 minutes north of Melbourne and I keep trying to get those later cars to come up but with no success.

This post though was more about seeing if others plan a solution path and asses things like I like to before the situation arises.
Robin Miller

Member
My Profile  Send Message

0
FollowupID: 732065

Reply By: Member - Kevin S (QLD) - Monday, Jun 27, 2011 at 13:22

Monday, Jun 27, 2011 at 13:22
Robin, was your starting point fully inflated tyres?
Kevin
Kevin
It is important to always maintain a sense of proportion

2019 Mitsubishi Cross

Lifetime Member
My Profile  My Blog  My Position  Send Message

AnswerID: 458557

Follow Up By: Robin Miller - Monday, Jun 27, 2011 at 13:51

Monday, Jun 27, 2011 at 13:51
Hi Kevin

No, I religiously drop to about 24 as I move of bitumen into dirt and this meant roughly 20 psi at start of track when tyres cooled from highway run.
Robin Miller

Member
My Profile  Send Message

0
FollowupID: 732074

Follow Up By: Member - Kevin S (QLD) - Monday, Jun 27, 2011 at 14:29

Monday, Jun 27, 2011 at 14:29
Thanks Robin. I normally drop my Maxxis 751 A/Ts to 28 when I come off the black top but I noticed that Stephen L said that he drops to 24 for the Birdsville Track. I am heading in that direction next week, hence my interest. The technique that you used to get up a slippery slope was one of which I was not aware. This kind of information on this web site is most useful. Since there is supposed to be rain across the Flinders Ranges before I get there it might be a useful technique on Skytreck?
Kevin
Kevin
It is important to always maintain a sense of proportion

2019 Mitsubishi Cross

Lifetime Member
My Profile  My Blog  My Position  Send Message

0
FollowupID: 732076

Reply By: Tonyfish#58 - Monday, Jun 27, 2011 at 15:30

Monday, Jun 27, 2011 at 15:30
Robin - Well done :-)

My answer to the question would be as many as you need to get out safely :-)

I was running 18 psi on some really soft beach sand up in princess Charlotte bay. Eventually, working hard, we came to the inevitable stop & bogged down.

Dropped them to 14psi all round, moved a little sand from front of the tyres and off we went. Did not have an issue after that - 4psi made all the difference :-)

Cheers Tony
AnswerID: 458570

Follow Up By: Robin Miller - Monday, Jun 27, 2011 at 18:35

Monday, Jun 27, 2011 at 18:35
Hi Tony

No real challenge their, it was more a pleasant interlude in which to practise in a real situation, and which makes you think about what might be the appropriate order in which to apply the various traction aids such that you get out with minimum fuss.

Mind you have no other track options does motivate you somewhat.
Robin Miller

Member
My Profile  Send Message

0
FollowupID: 732108

Reply By: Member - MUZBRY(Vic) - Monday, Jun 27, 2011 at 15:32

Monday, Jun 27, 2011 at 15:32
Gday Robin
I'll be in it for a cup of good coffee.....




Muzbry
Great place to be Mt Blue Rag 27/12/2012

Lifetime Member
My Profile  Send Message

AnswerID: 458572

Follow Up By: Robin Miller - Monday, Jun 27, 2011 at 16:10

Monday, Jun 27, 2011 at 16:10
Hi Muz

Yep this was a very relaxed affair - but how is your memory.

The above occurred only 100 meters from where a 100 series was stuck when you were up our way 2 years ago.

In that case the driver wasn't to happy about seriously dropping tyres and if you remember I pulled out my set of chains for him and he drove away - a total convert to the use of chains.
Robin Miller

Member
My Profile  Send Message

0
FollowupID: 732087

Reply By: Steve M1 (NSW) - Monday, Jun 27, 2011 at 17:59

Monday, Jun 27, 2011 at 17:59
was that chains in mud Robin?
AnswerID: 458587

Follow Up By: Robin Miller - Monday, Jun 27, 2011 at 18:30

Monday, Jun 27, 2011 at 18:30
Hi Steve
No , its basically a hard surface with a thin slick on top - such that muddies blocks are to big to break thru and provide traction.
You need high pressure per unit area that chains generate to provide a significant traction boost.
Robin Miller

Member
My Profile  Send Message

0
FollowupID: 732106

Reply By: rags - Monday, Jun 27, 2011 at 21:17

Monday, Jun 27, 2011 at 21:17
maybe could try it with a prado assuming the side slop does not exceed 42deg
AnswerID: 458609

Follow Up By: Robin Miller - Monday, Jun 27, 2011 at 21:37

Monday, Jun 27, 2011 at 21:37
You have been reading to many posts Rags - but as it happens one has joined our extended family and I'm working on it but the owner won't trust me with the keys after an embrassement on the last trip.


Image Could Not Be Found
Robin Miller

Member
My Profile  Send Message

0
FollowupID: 732133

Follow Up By: rags - Tuesday, Jun 28, 2011 at 09:08

Tuesday, Jun 28, 2011 at 09:08
So thats why a 4wd needs a sunroof,an alternative emergency exit
cheers Russ
0
FollowupID: 732160

Reply By: Dennis Ellery - Tuesday, Jun 28, 2011 at 10:09

Tuesday, Jun 28, 2011 at 10:09
Hi Robin,
I used to run split rims and at times dropped down to about 8psi.
Now I am running with Light Truck tubeless 10 ply 265/75/R16.
I’ve been dubious to lower to below 15psi for fear of breaking the bead.
When loaded I weigh somewhere between 2.5 to 3 tonne.
If in trouble, do you think I could go to 8 psi in sand with these tyres?
You are not using bead lockers are you?
Regards Dennis

AnswerID: 458643

Follow Up By: Robin Miller - Tuesday, Jun 28, 2011 at 11:54

Tuesday, Jun 28, 2011 at 11:54
Yes Dennis that should be fine - my weight and tyres are similar and 8psi is quite acceptable even on harder surface with appropriate care and speed.
I don't use bead lockers.

Got caught out on Madigan by myself once and had only 1 chance to get it right so went straight to 9psi according to my trip notes.

Image Could Not Be Found







Robin Miller

Member
My Profile  Send Message

0
FollowupID: 732167

Follow Up By: Dennis Ellery - Tuesday, Jun 28, 2011 at 14:39

Tuesday, Jun 28, 2011 at 14:39
Thanks for that Robin.
I’m fishing at Shark Bay at the moment.
I know a soft sandy hill for a tryout next week.
0
FollowupID: 732178

Reply By: Patrol22 - Tuesday, Jun 28, 2011 at 19:10

Tuesday, Jun 28, 2011 at 19:10
Thanks for that rundown of you experience Robin....like other I too have been a bit shy on going too low with the pressures....been down to 12psi once but just for a 10 metre run to get out of trouble and then back up to 16psi.
Having read the thread entirely I'm thinking there is only one type of traction device missing from the discussion....that is 'pucker power traction' - this of course is best when used on a motorbike because the glutious maximus stand a fair to middlin' chance of grabbing a hold...that said it doesn't stop working (or trying to work) when in hairy situation in a 4by though :-)
AnswerID: 458692

Sponsored Links