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Getting 4WD Tyre Pressure Right

Discussion in 'Bridgestone' started by Bridgestone, Apr 11, 2018.

  1. Bridgestone

    Bridgestone Member

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    [​IMG]

    I’ve long said that the single best value for money modification you can make to your 4WD that will get you further off-road than anything else, hands down, is tyre pressures. Adjusting air pressure in your tyres can cost you nothing, yet it is the single best thing you can do to your rig across the board to increase performance.

    Adjusting your tyre pressures increases or decreases your tyres footprint or surface area in contact with the ground. This offers lesser or greater resistance (grip) and alters your tyres reaction to the terrain over which you’re travelling.

    Starting with the blacktop, I would hazard a guess that I keep an eye on my road pressures at the very least once a month but probably more frequently. A few years back I found on my GU that by increasing my road pressures well above what I had been running them at, I was able to save a litre of diesel per 100kms travelled. Just by getting my on-road pressures correct. It’s like I’m making money now as a result!

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    As soon as I leave the black top and venture on to any other style of terrain for a prolonged distance, I’m instantly thinking pressures. From black top it’s very common to hit high speed gravel (my second favourite terrain to beach driving by the way) and to rack up some big distances on said terrain. Road pressures suck on gravel; it’s uncomfortable for you and your passengers and contributes towards the creation of corrugations. Dropping your pressures, as well as your speed, smooths out the ride, makes it safer. High pressures and gravel combined with speed equals a lack of grip…. hold on! As a very general rule of thumb, for high speed gravel I’ll drop my tyres to around 28PSI.

    I mentioned corrugations and on some lengths of track they can be utterly diabolical. Head out towards Steep Point, the most westerly point on mainland Australia and you’ll see what I mean. These tracks still allow you to travel with speed but high pressures will just about rattle your rig to pieces. In these conditions Ill drop my pressures into the low 20 PSI range and then adjust my speed to find a comfortable maximum.

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    Next up let’s think about low range conditions, steeps, rocks, ruts, mud and anything else that causes you to engage the stubby lever. It’s in these conditions that traction is key. Low pressures increase the ground surface area that your tyres are in contact with. More contact area, greater possible traction. Also, lower pressures enable your tyres to mould around obstacles, again improving contact, reducing the risk of tyre damage and increasing traction. My go-to starting point for anything low range is 18 PSI.

    Then we have sand; perhaps the most critical location for correct tyre pressures. As a rule of thumb, as soon as I hit a beach, I drop my tyres to 15 PSI. I then perform a very quick test to see if I’m in the ball park; simply build speed then disengage your gears, stop accelerating and let your 4WD coast to a stop. If your pressure is correct your vehicle will come to a slow and gradual stop. If your pressures are too high, you will stop suddenly as the tyres dig in. This is a fantastic rule to work by and I urge you to give it a crack. Remember the lower your pressures, the slower you must drive and avoid sharp turns as you run the risk of busting a tyre bead, which is a real pain in the backside.

    Learn to master this art and I assure you, any terrain will be looked upon differently; you’ll drive more efficiently, in more comfort, with greater traction and further, simply thanks to the best value modification you can make, tyre pressures.

    By Graham Cahill


    LINKS:

    Bridgestone Australia - www.bridgestonetyres.com.au/

    Bridgestone Australia Facebook - www.facebook.com/BridgestoneAU
     
  2. Reaper

    Reaper Tells it like it is.

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    So what pressure were you running on bitumen then?
     
  3. Not_An_Abba_Fan

    Not_An_Abba_Fan Exhaust Guru

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    This is an article from an old 4WD Action magazine, I doubt he will reply.
     
  4. Mike Litherous

    Mike Litherous Active Member

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    Lol just a quick cut and paste job but definetly worth lowering pressures for the dirt whether 4wd or not.
    Normally I run around 44 psi in the Land Rover on bitumen. Sometimes knock them back a few psi in winter just for more wet grip on the all terrains.
     
  5. Not_An_Abba_Fan

    Not_An_Abba_Fan Exhaust Guru

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    Nice to see a fellow Land Rover owner, I have a Range Rover Classic.
     
  6. Mike Litherous

    Mike Litherous Active Member

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    Nice. Mines a D2 td5.
     
  7. Bridgestone

    Bridgestone Member

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    Hi Reaper,

    We'll check with the technical department and get back to you on this ASAP.

    Kind Regards,
    The Bridgestone Team
     
  8. losh1971

    losh1971 Well-Known Member

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    I used to run around with around 28 on the bitumen. I mainly did that because I used to switch from tar to dirt quite regularly and the lower pressures helped with the corros and rough roads. Good thing about proper 4WD tyres is you can leave them at lower pressures on the tar because they are made of light truck construction quite often which seems to handle lower pressure no problem.
     
  9. Bridgestone

    Bridgestone Member

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    Our 4WD tyres can run 5PSI higher than recommended on tyre placards due to heavier construction. The higher PSI also helps the tyres to run cooler.

    Kind regards,

    The Bridgestone Team
     
  10. Bridgestone

    Bridgestone Member

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    Hi losh1971,

    That's correct, thanks for sharing your tip on tyre pressures!

    The Bridgestone Team
     

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