Tyre pressure in sand - Page 2





Page 2 of 2 FirstFirst 1 2
Results 21 to 40 of 40
  1. #21
    Join Date
    Mar 2008
    Location
    De Wildt
    Age
    58
    Posts
    39,905
    Thanked: 16415

    Default Re: Tyre pressure in sand

    Nothing prepares a Gautenger for Moz dune sand in summer.......
    Jakes Louw
    2012 Jeep Sahara Unlimited 3.6 V6
    Percivamus

  2. The Following 3 Users Say Thank You to jelo For This Useful Post:


  3. #22
    Join Date
    Aug 2013
    Location
    Helderkruin
    Age
    54
    Posts
    2,008
    Thanked: 479

    Default Re: Tyre pressure in sand

    Dit hang maar als af van hoe jou 4x4 gelaai is en die omstandighede waar jy ry in sand.
    Ek is nie n groot kenner nie maar ry al baie jare 4x4 en dan weet ek wat my 4x4 kan doen en nie doen nie.
    Ek ry met my F in die woestyn dan is ek baie swaar gelaai dan blaas ek af tot 1.1 bar.

  4. #23
    Join Date
    Dec 2018
    Location
    Kleinbaai, Gansbaai
    Age
    69
    Posts
    7
    Thanked: 3

    Default Re: Tyre pressure in sand

    Het 15 jaar in Dubai gebly en het redelik baie woestyn gery, veral die eerste paar jare. Het dag uipstappies gedoen en op d basecamp beplan, dan sodra ek by die area kom waar ek wil wees het ons onmiddellik in die woestyn ingegaan en net die GPS roete gevolg. Daar was nie sprake van paaie of spore volg, ons het spesifiek daarvan weggebly. Was meestal aan die voorpunt, my reŽls vir saamry was eenvoudig, blaas bande onmiddelik af na 0.8 bar en as jy nie voorheen woestyn gery het nie ry my vrou saam en jy volg haar instuksies anders kan jy maar huis toe. Het te veel gesukkel met mense wat beter weet. Die NamibiŽrs het my in die begin 70s geleer sand ry en die Arabiere kan my nog n ding of wat leer in die sand.

    Ek en my vrou het op tye alleen gery en vele kere vasgesit waar ons bande na 0.5bar afblaas en dit tot 3 ure vat om uit te grawe. Die belangrikste lesse wat mens leer is dat as jy met die regte banddruk vir die omgewing begin en met oorleg ry, kan mens omtrent oral kom sonder om jou voertuig te breek. Bo alles geniet jy dan die ekskursie en jy kan die wonder van die natuur ervaar. Sorg dat jy die regte toerusting het as jy hulp nodig het en n pomp om weer bande op te blaas.

  5. The Following User Says Thank You to andrevanschalkwyk For This Useful Post:


  6. #24
    Join Date
    Aug 2013
    Location
    Helderkruin
    Age
    54
    Posts
    2,008
    Thanked: 479

    Default Re: Tyre pressure in sand

    Andre jy se nou al die regte goed en dit is al hoe jy daar ry in die woestyn
    Quote Originally Posted by andrevanschalkwyk View Post
    Het 15 jaar in Dubai gebly en het redelik baie woestyn gery, veral die eerste paar jare. Het dag uipstappies gedoen en op d basecamp beplan, dan sodra ek by die area kom waar ek wil wees het ons onmiddellik in die woestyn ingegaan en net die GPS roete gevolg. Daar was nie sprake van paaie of spore volg, ons het spesifiek daarvan weggebly. Was meestal aan die voorpunt, my reŽls vir saamry was eenvoudig, blaas bande onmiddelik af na 0.8 bar en as jy nie voorheen woestyn gery het nie ry my vrou saam en jy volg haar instuksies anders kan jy maar huis toe. Het te veel gesukkel met mense wat beter weet. Die NamibiŽrs het my in die begin 70s geleer sand ry en die Arabiere kan my nog n ding of wat leer in die sand.

    Ek en my vrou het op tye alleen gery en vele kere vasgesit waar ons bande na 0.5bar afblaas en dit tot 3 ure vat om uit te grawe. Die belangrikste lesse wat mens leer is dat as jy met die regte banddruk vir die omgewing begin en met oorleg ry, kan mens omtrent oral kom sonder om jou voertuig te breek. Bo alles geniet jy dan die ekskursie en jy kan die wonder van die natuur ervaar. Sorg dat jy die regte toerusting het as jy hulp nodig het en n pomp om weer bande op te blaas.

  7. #25
    Join Date
    Dec 2012
    Location
    Secunda
    Age
    53
    Posts
    1,285
    Thanked: 173

    Default Re: Tyre pressure in sand

    Wat n nice tread ek hier deur gelees en stem saam ken jou voertuig blaas daai bande af en geniet

  8. #26
    Join Date
    Sep 2019
    Location
    Standerton
    Age
    64
    Posts
    4
    Thanked: 1

    Default Re: Tyre pressure in sand. Heeltemal reg Te veel berekeninge is meer pyn as plesier

    Quote Originally Posted by HugoNotte View Post
    Or you could simply deflate your tyres to 1 bar and give it a try, if we are talking dune sand. From there on simply play around a bit with the pressures and feel the result. 4x4 and sand driving is more about feel than bare numbers.
    Depending on your type of tyres, trying to push an A4 sheet of paper against the front and rear of the thread will be a bit of a hit and miss I would think, unless you drive racing slicks. But a decent MT tread pattern might make it a bit more difficult with large blocks and lugs.
    And what happens once you got your "maximum footprint" achieved and you drive around a bit, the tyre heats up, pressure builds up again and your maximum foot print is somewhere a few km behind you.
    Personally I'd rather spend time driving in sand then pushing paper...

  9. #27
    Join Date
    Jul 2011
    Location
    Richards Bay
    Age
    37
    Posts
    561
    Thanked: 120

    Default Re: Tyre pressure in sand. Heeltemal reg Te veel berekeninge is meer pyn as plesier

    The days when the beaches were still open, we laaities had two jobs.

    Lock the front hubs.
    Deflate the tires.

    Mom and dad relaxing in the 4by.

    And that is one thing I have learnt to always do. Deflate your tires if you going on sand. I worked on a mine in Richards Bay and my duties was going to all the ponds with PLENTY of dune driving. And 99% of the time I was always alone, but never got stuck. I had a Toyota Hilux. 2.7i......fill up in the morning, empty when I got back to the office.

    Like someone said earlier in the thread, you don't want to be THAT guy supplying ample entertainment.
    2007 Nissan Pathfinder LE 2.5dCI 4x4
    2013 Nissan Xtrail 2.0dCi XE 2x4

  10. The Following User Says Thank You to IcePick88 For This Useful Post:


  11. #28
    Join Date
    Dec 2015
    Location
    Beachview
    Age
    61
    Posts
    26
    Thanked: 10

    Default Re: Tyre pressure in sand

    Quote Originally Posted by Mike N View Post
    Look at the difference low tyre pressure make in sand. And don't you love that system with a coiled pipe from storage tube at each wheel for inflation / deflation?
    https://www.youtube.com/watch?v=BPwNVQqAiQY
    Hi Mike, I have purchased a similar system for my truck, also with the coiled air hoses. Mine should be installed by end of November. Will give you feedback once tested.
    Regards

    Mac
    2009 Ford F150 King Ranch 4x4
    MB 1017 Atego Motorhome

  12. The Following User Says Thank You to Macmcl For This Useful Post:


  13. #29
    Join Date
    Oct 2012
    Location
    Cape Town
    Age
    56
    Posts
    581
    Thanked: 269

    Default Re: Tyre pressure in sand

    Quote Originally Posted by andrevanschalkwyk View Post
    Het 15 jaar in Dubai gebly en het redelik baie woestyn gery, ........en die Arabiere kan my nog n ding of wat leer in die sand.
    Jinne maar jy leer stadig
    That Mighty Amarok
    ---------------------------------------
    Swart Tires wat ek self gekoop het
    Pull over wat my ouma gebrei het
    Vensters waar deur ek kan sien
    Engine voor
    Exhaust agter

  14. #30
    Join Date
    Oct 2017
    Location
    Rustenburg
    Age
    51
    Posts
    2,986
    Thanked: 4473

    Default Re: Tyre pressure in sand

    Quote Originally Posted by Snyks View Post
    Jinne maar jy leer stadig
    Ten minste kan hy iets leer
    _______________________________________
    Andrew van Staden
    With a mild case of "Camping Personality Disorder" or CPD

    I drive a five cylinder bakkie and tow an army inspired van.

  15. #31
    Join Date
    May 2018
    Location
    Ede
    Posts
    81
    Thanked: 56

    Default Re: Tyre pressure in sand

    Quote Originally Posted by Fyko View Post
    Reducing tyre pressure has almost nothing to do with size of footprint but everything to do with the profile of the footprint.

    A hard tyre is like rolling a beer bottle across the sand - it pushes a hill of sand ahead of it, which it must then climb over. Press down on the bottle and it pushes sand away on both sides of the curve.

    A soft tyre is like a plastic bag filled with water, it rolls across the sand without making any kind of impression.

    When a tyre is at the right pressure the usual convex-ness where it touches the earth reverses into concave-ness, an ever-advancing inverted cup that rolls forward without disturbing the sand's surface or pushing it ahead, behind or sideways.

    The footprint area barely increases at all with deflation, and doesn't need to.

    (And the heavier the vehicle is loaded the better it works.)
    Part of this I agree, especially the part about the beer bottle. But: the weight of the car is born by the tyres; so the load has to be born by the footprint; the sidewalls do not carry any load so the weight is carried by the air pressure in the tire. If you lower the pressure by 1/3 (e.g. from 3 to 2 atm) the footprint increases by 50% to carry the same load. If you go from 2 to 1 atm, the footprint doubles. There is no other way except having your vehicle lifted by balloons. Indeed in sand a very low tyre pressure is welcomed.

  16. #32
    Join Date
    Sep 2016
    Location
    BogotŠ
    Posts
    142
    Thanked: 96

    Default Re: Tyre pressure in sand

    Quote Originally Posted by CanAmSteve View Post
    I took a coach across the Andes (Chile to Argentina) years ago. The coaches and many of the trucks on the route (hundreds of switchbacks) had the ability to add/reduce pressure in the tyres on the fly. The rig is a thin rod carrying a tube that runs into a connection concentric to the hub (so it doesn't twist). Not sure how it would work in sand. Apparently this is to allow for the change in pressure when driving from sea level to the pass @ 3800M
    This system is, as noted, in use throughout South America and Central America. The variation in gauge pressure is notable. We check pressures routinely and can more or less predict the pressure depending on the altitude; temperature also has a notable impact - minus 10 deg C will give a significantly different pressure from 35 deg C.

    Interestingly, it seems that the kit doesn't get stolen, at least not in the Americas. It's integrated into the suspension so not that easy to nick, although obviously anything's possible. Perhaps people who might steal from a top-end Mercedes won't from the means most people use to get around.

    PS: the licence plate in the picture is actually from Colombia, I believe (La Virginia, Risaralda).

  17. #33
    Join Date
    Nov 2009
    Location
    Richardsbay, KZN
    Age
    46
    Posts
    5,789
    Thanked: 16957

    Default Re: Tyre pressure in sand. Heeltemal reg Te veel berekeninge is meer pyn as plesier

    Quote Originally Posted by IcePick88 View Post
    The days when the beaches were still open, we laaities had two jobs.

    Lock the front hubs.
    Deflate the tires.

    Mom and dad relaxing in the 4by.
    Only two jobs? Slapgat laaities you were

    Being the only laaitie, I had to pack the fishing bats, off course do like you did when we reached the beach ramp and find and catch bait for the toppie, find wood for the fire to do his potjie on etc etc.

    Then also my dad would purposely get the Hilux badly stuck, give me a shovel and give me 30 minutes to get it out and park it away from the hole anders dans daar poppe wat jy nie eers 'n dop voor wil koop. And if the excavation area where you got the bakkie out from is not filled back to how it was before, then the chicks will tango.

    But I wouldn't have it any other way, even though I learnt the hard way what's what with driving our Zululand beaches.
    "Stare, pry, listen, eavesdrop. Die knowing something, you are not here long"
    Walker Evans, Photographer

  18. #34
    Join Date
    Mar 2008
    Location
    De Wildt
    Age
    58
    Posts
    39,905
    Thanked: 16415

    Default Re: Tyre pressure in sand

    Also learned how to unstick a Chev station wagon in Moz sand as I was also a single child and not spoiled
    Jakes Louw
    2012 Jeep Sahara Unlimited 3.6 V6
    Percivamus

  19. #35
    Join Date
    Sep 2006
    Location
    The Windy City
    Age
    49
    Posts
    15,816
    Thanked: 4073

    Default Re: Tyre pressure in sand

    I saw again yesterday, had to go onto the beach, did not check tyre pressures when going on but it was road pressures, made it about 400m in when I had to stop, and that was it the slightest attempt to pull away and the vehicle would just dig down.

    Got my Indeflate out and deflated to about 1.2 all round, got in and carry on as it is was a tar road.

    First time for me on sand in the new to me stock Navara with tyres a lot smaller than almost all my previous vehicles. I am used to deflating to 0.8 to 1bar as the starting point on larger tyres in the past.

  20. #36
    Join Date
    Feb 2019
    Location
    Stellenbosch
    Posts
    328
    Thanked: 146

    Default Re: Tyre pressure in sand

    Quote Originally Posted by Fyko View Post
    Reducing tyre pressure has almost nothing to do with size of footprint but everything to do with the profile of the footprint.

    A hard tyre is like rolling a beer bottle across the sand - it pushes a hill of sand ahead of it, which it must then climb over. Press down on the bottle and it pushes sand away on both sides of the curve.

    A soft tyre is like a plastic bag filled with water, it rolls across the sand without making any kind of impression.

    When a tyre is at the right pressure the usual convex-ness where it touches the earth reverses into concave-ness, an ever-advancing inverted cup that rolls forward without disturbing the sand's surface or pushing it ahead, behind or sideways.

    The footprint area barely increases at all with deflation, and doesn't need to.

    (And the heavier the vehicle is loaded the better it works.)
    This is one of the better ways I've heard it explained, thank you. Nice analogy with the plastic bag.

    I agree absolutely, it has got very little to do with the lengthening or widening of the profile, but a lot to do with the flex that deflation allows (becoming concave in the middle of the tyre). If it was purely down to footprint length and width then something like a Jimny with 35's (which is a huge increase in tyre profile width and length over stock) should be able to float over the sand without ever deflating, but that is not the case is it. Take a a 265/65/17 tyre size and deflate the footprint to the same as a 285/75/17 (hard) and the 265 will be better in sand all day every day. It's all about preventing sand build up in front of the tyre and keeping the tyre rolling on top instead of dragging and beginning to dig.

    Cheers

  21. #37
    Join Date
    Jul 2011
    Location
    Richards Bay
    Age
    37
    Posts
    561
    Thanked: 120

    Default Re: Tyre pressure in sand. Heeltemal reg Te veel berekeninge is meer pyn as plesier

    Quote Originally Posted by Riaan van Wyk View Post
    Only two jobs? Slapgat laaities you were

    Being the only laaitie, I had to pack the fishing bats, off course do like you did when we reached the beach ramp and find and catch bait for the toppie, find wood for the fire to do his potjie on etc etc.

    Then also my dad would purposely get the Hilux badly stuck, give me a shovel and give me 30 minutes to get it out and park it away from the hole anders dans daar poppe wat jy nie eers 'n dop voor wil koop. And if the excavation area where you got the bakkie out from is not filled back to how it was before, then the chicks will tango.

    But I wouldn't have it any other way, even though I learnt the hard way what's what with driving our Zululand beaches.


    Same. Best times when we could camp on the beach with no worries. I cant remember how many times we just slept next to the fire. Woke up, then back fishing. Those were the days.
    2007 Nissan Pathfinder LE 2.5dCI 4x4
    2013 Nissan Xtrail 2.0dCi XE 2x4

  22. #38
    Join Date
    Jun 2014
    Location
    Zululand
    Age
    54
    Posts
    165
    Thanked: 120

    Default Re: Tyre pressure in sand

    Agree, I miss sleeping in the casuarina at Nyoggies and Long Beach. My two Ridgebacks along as guards

  23. #39
    Join Date
    Jan 2015
    Location
    Port Elizabeth
    Age
    58
    Posts
    230
    Thanked: 288

    Default Re: Tyre pressure in sand

    I grew up in Mtunzini. Also remember the long drives on the beach, and the nights spent next to the fire.
    Guy B. Vergoes Houwens
    2014 LC76 4.5 V8

  24. #40
    Join Date
    Apr 2009
    Location
    East London
    Age
    66
    Posts
    1,031
    Thanked: 173

    Default Re: Tyre pressure in sand

    Since using my first ever 4x4 - an Hilux 2.2 petrol with superdiggers as tyres in sodwana and then mozambique , I deflate tyres whenever I am in soft sand ...; after a number of trips to eg botswana, zambia, mozambique , namibia , zim , and returns to sodwana , ponta , (ponta to catembe in the old dirt road ) etc I have worked out tyre pressures @ 1,8 bar to 2,0bar for gravel when loaded for eg old transkei roads (including towing trailer / and/or boat) and eg jozini <>sodies old road ;moamba > ressano in mozambique or eg ; namibia > mata mata ; now on the beach my current 4x4 (colt 2,8tdi clubcab) performs well with GY wranglers ( both at/sa's and/or adventures ) @ 1,2 bar ; even driving between 12 to 2pm hours of the day ( eg mabibi , sodies) ; mabua > nossob or nossob bitter pan for ie when the sand is hot the tyres and bakkie perform very well ; never got stuck ; the only time i have been stuck was in the ckgr because of the black cotton clay? (matope?) .... but with a bit of pt work and unhitching the van in tow we made it to camp ! Rgds to all !

  25. The Following User Says Thank You to Jayefe For This Useful Post:


Page 2 of 2 FirstFirst 1 2

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •