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Toddyh03 Profile
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X-TRAIL HOLIC
 


Date Registered: 08-2011
Location: Lalor Park, NSW
TOTAL POSTS: 1663
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Re: Tyre pressures for off-raod driving (trails)


24psi might be OK for hard packed beach front sand but if you try to use than pressure on the dunes at Stockton you will find yourself buried to the axles very quickly.

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Toddyh X-2048 (c)
New: Challenger
Old: 2010 T31 Diesel modified
My XTrail
17/Dec/2012, 7:30 am Link to this post Send Email PM   Send Private Message Blog
 
dlpeek Profile
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X-TRAIL VETERAN
 


Date Registered: 12-2010
Location: Macquarie Fields SYDNEY
TOTAL POSTS: 988
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Re: Tyre pressures for off-raod driving (trails)


I did a sand driving course at Stockton beach some 2 years back with many different 4WD model cars from the biggies down. The instructor had everyone drop pressure to 16psi prior to entering the sand. On one occasion only, after 2 attempts to climb a steep dune, myself and another vehicle dropped down a further 2psi and I managed to climb the dune. I did note that when I started to drop the psi down that my gauge read 18psi , up 2psi from when I entered the sand. Shows that the tyre pressure had increased as they got hotter from the sand driving.
I did not alter the pressure again until I left the beach.

On fraser Island I deflated to 20psi on the barge across and left it there for the entire week....although on the "highway condition" low tide on the beach I was tempted to increase back up for the long run up to Indian Head.
Leaving Orchard beach I dropped to 18psi for the trip back to Inskip Point. In hindsight perhaps 16psi would have been better but I made it back through often very soft sand OK.

So for softer sand beaches I would recommend start at 16psi and adjust as required. It's amazing what a 2psi difference either side makes.



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Dave Peek
X-1756 (c)
2010 T31 ST-L (S2) CVT Precision Grey.
Tow Bar, bash plates, PEDDERS lift, YOKO GEO AT/S tyres.


17/Dec/2012, 8:49 am Link to this post Send Email PM   Send Private Message Blog
 
MrMez Profile
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Date Registered: 03-2011
TOTAL POSTS: 124
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Re:


Tyre and rim size, in particular, side wall height make a big difference as to how low you can go.

18" rims with low profile tyres, you are pretty boned. 16" with big tyres, I found (through lots of trial and error, and a bit of good advice), that 8psi is the magic number.

On my TS with 17" rims, I have my stauns set to ~15psi. The effective gear ratios are lowered quite a bit, and grip is excellent. You do lose a fair bit of ride height which isn't good to begin with, and you also need to be careful of rolling a tyre off the rim.
17/Dec/2012, 11:11 am Link to this post Send Email PM   Send Private Message Blog
 
Ian Ewin Profile
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Date Registered: 03-2012
Location: Newcastle, NSW
TOTAL POSTS: 471
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Re: Tyre pressures for off-raod driving (trails)


quote:

Tyre and rim size, in particular, side wall height make a big difference as to how low you can go.


Yes, I agree, however..
quote:

16" with big tyres, I found (through lots of trial and error, and a bit of good advice), that 8psi is the magic number.



I now run 29" mud-terrains on a 16" rim and even with the extra sidewall reinforcement that comes in such heavy duty tyres, there's still no way I would deflate my tyres to 8psi. I've only ever needed to go lower than 12psi, once (10psi on T30 w/ stock tyres), and I've been on sand varieties that include Stockton's giant dunes and unpredictable sand pockets, Birubi's hard flat stretches and bumpy tracks, Blacksmiths' short & sharp foredunes, and even the soft and unforgiving hill climbs behind Redhead. At such a low Psi, risk of the tyre coming off the rim is a lot higher, as is damaging the tyre's sidewall due to overheating or the tyre pinching and becoming more susceptible to cuts. Considering most people run stock or h/t tyres, (regardless of tyre size) it would generally be safe to use 12-18psi and have no dramas.

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Ian X-2305(c)
New: 2010 NT Pajero
Old: 2008 T31 Xtrail "The Monster"
The only one of her kind.. may she rest in peace :(
17/Dec/2012, 3:15 pm Link to this post Send Email PM   Send Private Message Blog
 
Translucidus Profile
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Date Registered: 05-2010
Location: Adelaide
TOTAL POSTS: 599
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Re: Tyre pressures for off-raod driving (trails)


With the 60 profile Yokohamas as per the original question, I have them and have found that any lower than 27psi front and back can easily result in Sidewall Crushing against the rim (not nice!!!!) when going over rocky/gnarley tracks due to the short distance between the tread and the rim.

On rocky or corrugated roads at speed (no more than 80km/h) 28psi all round will prevent punctures from sharp rocks. 38psi will Guarantee punctures if there are sharp rocks around!!!

I've never needed any lower than 26psi on sand including soft churned sand. I do have an engine bash plate that is an excellent skid pan and can't imagine going on sand (or off road generally) without it as the XTrail is a bit lower than most traditional 4WDs.

Remember the lower the pressure the lower the car and the less ground clearance. It's a compromise unless you have done the suspension lift.

Last edited by Translucidus, 14/Dec/2013, 9:04 pm


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2007 X-Trail T31 ST-L

Xy going vertical at Bendleby Station . . .

14/Dec/2013, 9:03 pm Link to this post Send Email PM   Send Private Message
 


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