Tyre Pressures Again

Sorry where are my manners.

Thanks in advance.

DiesAl,

I too have a hilux and have been told to run 40 psi all round by my tyre place - on BFG AT KO's.

I have been running that for about 15, 000 kms now and after experimenting with the 4 psi rule only last week found that that is about right for my set-up. My car weighs in at 2420 kg though, with only about 100 kg difference between the front and rear axle weights.

So in other words, 40 psi is right for me. If you only have a bulbar, and not much else added to your car, and you travel unladen mostly, then I would think that what you have discovered playing with the 4 psi rule is about right.

Best thing to do would be to go with it for a while and see what you think - check out your wear patterns in a few thousand k's and see if 40 front / 36 rear is right for you.

I've got a similar vehicle to you and have found 38psi front and back when unloaded is about right for the Navara. When the back is loaded I pump the back to 42-46 psi.

The bull bar because it hangs forward of the axle and not over it likke most weights will put load on your tyres and if you talk to suspension people they will tell you the same which is why they recommend heavier springs when you have a winch bar.
Your pressure in the front is paramount as this is where the load is when the vehicle is unlaiden. I run 40 in the front and 35 in the back on my unlaiden hilux and this gives great results for comfort and tyre wear. When laiden with a heavy load I increase the rear to 40 as well but to run 40 in the rear unlaiden will make it more prone to axle hop on uneven surfaces.
Having said all that these pressures are for bitchumen running and are all out the window when i get on rough tracks where I reduce the pressures.
Hope this helps sunshine

I run at about 32-34 in the rear of my hilux xcab with no load (BFG AT's), if I run the pressure at 36+ the rear tends to skip & breaks traction easy - particulary in the wet.
Do suffer from wear on the outside shoulders on the front so if anyone else suffers from this???? Running standard torsion bars with winch, steel bar and scrubbies so am wondering if the extra weight is rolling the tyres onto the shoulders when turning as the front is bit soft??

see you in the scrub...

It changes depending on the surface. My own preferences are 18psi heavysand 15 psi soft sand but I do go down to 10 to 12 in certain circumstances in this terrain but the lower you go the more prone you become to rolling a tyre off the rim and you must keep this in mind and avoid sharp turning with pressures that low for safety reasons.
22 to 24psi is what I use for general offroad. I used these pressures on the cordillo from Birdsville to innaminka kept the speed at around 90kph and never had any problem. Over sharp gibber like that your speed becomes as critical as your pressures.
There are probably hundreds out there that would rubbish my phylosophies but it has worked for me and as yet I haven't rolled a tyre off a rim or shredded one so I'm either lucky or somewhere around the mark.
Good luck with your ventures, there is no right or wrongs but just preferences and guidelines it's up to you to wade your way through them and decide what works for you. See ya buddy.

I have only used Kumho ventures, Kumho powerguards and olympic overlanders all in the 31x10.5x15 variety and all worked the same for me you take care too.