Off-Road Tyre Pressures ?

[Fluids]

So, I seem to have my on-road pressures sussed ... 33Fr / 42Rr psi. Firm ride with 1 to 2 people, nice with 4. About 10% above the tyre placard recommendations.

... and my sand pressures at 16psi all round. Was running 18psi but the extra 2psi lower makes a world of difference. It's remarkable what 2psi can do !

But what about off-road ... dirt / mud / rocky ground ? Haven't done any of that sort of terrain yet (not seriously).

We'll be spending the october long weekend at my brother-in-laws dairy farm at Gloucester ... 1000+ hectares of hard dirt/clay, hard greasy mud ... & cow slop :eek: and plenty of steep rocky hills and tracks everywhere ... and I WANT TO PLAY !! :D

D2a Classic Td5 Auto with Cooper S/T 255/70 16's

Suggestions ? Thanks!

Kev..

[Slunnie]

The Cooper ST needs to go down to 20psi for slow 4WDing. That is the word from the reps because that tyre in particular doesn't cope at all with wheelspin, and wheelspin will tear the outer tyre lugs. Also, as soon as the track thinks about getting sketchy, lock the CDL to further minimise wheelspin aswell.

Air up as soon as you get out again.



I also found 36psi F&R to work well on the road. The ST flexs a lot in the sidewalls if the pressures are too low.

[Allan]

15 with BFG Muds and it will go almost any place even open diffed. Sons D1 stayed with my Puma SVX in all conditions and had me thinking I could have saved a lot of money by not giving him this vehicle

Allan

[Fluids]

The Cooper ST needs to go down to 20psi for slow 4WDing. That is the word from the reps because that tyre in particular doesn't cope at all with wheelspin, and wheelspin will tear the outer tyre lugs. Also, as soon as the track thinks about getting sketchy, lock the CDL to further minimise wheelspin aswell.

Air up as soon as you get out again.



I also found 36psi F&R to work well on the road. The ST flexs a lot in the sidewalls if the pressures are too low.


Thanks Slunnie ... OK, I'll start at 25psi and work down ... I've got 3 days to experiment ... plenty of opportunity for wheelspin at the farm ... and I normaly engage CDL as soon as I get off-road ... just for the extra sure-footedness ...

Yes, the ST at 16psi bulges A LOT ... at 18psi it's still standing up very much more ... 16psi on the tar is a strange feeling ! Need to get a compressor, but I have 2 servo's within 100m of home ... both have 24hr air and are between the beach and home (like, 500m!) , so thus far haven't need a comp'.

... as usual, I'll bet the farms air comp' is out of action ... need a compressor ... need a compressor ... need a compressor ...

Kev..

[Zute]

I run my STT's at about 34psi on the road, drop to about 26-28psi when heading up to the Brindies and 20psi when things get tuff. Mud/sand/rock.

The zook I run at 26-20-10psi respective. But its way lighter.

[Slunnie]

I run my STT's at about 34psi on the road, drop to about 26-28psi when heading up to the Brindies and 20psi when things get tuff. Mud/sand/rock.

The zook I run at 26-20-10psi respective. But its way lighter.
From my experiences the STT seems to have a stiffer carcass than the ST and can be run at lower pressures also.

[alien]

The Cooper ST needs to go down to 20psi for slow 4WDing. That is the word from the reps because that tyre in particular doesn't cope at all with wheelspin, and wheelspin will tear the outer tyre lugs. Also, as soon as the track thinks about getting sketchy, lock the CDL to further minimise wheelspin aswell.

Air up as soon as you get out again.



I also found 36psi F&R to work well on the road. The ST flexs a lot in the sidewalls if the pressures are too low.

I ran ST's at 24psi up Blue Rag on new years day and some of the lugs are damaged.
4 people no camping gear.
Think i'll go 20 next time.

Cheers.

[long stroke]

From my experiences the STT seems to have a stiffer carcass than the ST and can be run at lower pressures also.

Yeah i agree, i'm running STT'S on mine, and have tested them at around about 16-18 PSI and have found they still don't flex as much as the bfg's on the county running 18PSI;)

[sanbar]

Suggestions ? Thanks!

Kev..

Not long back from doing the Land Rover Experience at Eastnor. They run normal road pressures for everything (instructors can't be fagged carrying a compressor) although it generated a fair bit of winch work at one point.

[Fluids]

OK, so a quick update.

18psi seemed to work well across most of the terrain we played on. I'm impressed with how well the D2a climbed the hills ... we'd get to the top, following Chris who was riding a quad, and say ... "Cool ... got anything harder / steeper ?" :cool: .... so off we'd go again .... get to the top ... "Anything harder ??" .... after 3 or 4 of these there was nothing bigger or steeper left on the farm .... Chris was like :o :eek: :mad: ... smartarse !! :cool: He didn't believe we could get to the top of the hills.

Had the front LH wheel about 3ft in the air crossing one washout at 45deg going up a very steep hill ... all we could see was blue sky through the windscreen ... the passengers were not happy Jan! :eek: and quiet frankly, I backed up for fear of sliding sideways and rolling a bloody long way down the hill ... backed up and went around the washout.

I would have struggled to get either of my old SIII landy's up some of those hills ... the D2a just walked up with minimal effort ... low range, CDL in, and the occassional T/C engagement (with 5 people on board) ... and the auto just makes it sooooo easy to just squeeze in just enough throttle as required without having to play clutch & throttle games.

A truly capable off-roader. I'm impressed (stock std except for the Cooper ST's).

Thanks for the opinions & advice.

[Shaker]

I ran ST's at 24psi up Blue Rag on new years day and some of the lugs are damaged.
4 people no camping gear.
Think i'll go 20 next time.

Cheers.

No matter what you do, Cooper STs will chip & tear in rocky terrain.
The only thing worse than a Cooper ST ..... is the so called warranty!

[greendisco2]

A mate and i went out to neerium east on the weekend and he's running cooper stt's on a lifted 80 series L/C and me with the stock D2 td5 with the michelin xpc's both at 26psi and i ate up the tracks:D,should i have run them a bit lower? I think he's a bit suprised at how good the disco go's for a stock unit:D.tony

[Fluids]

A mate and i went out to neerium east ... I think he's a bit suprised at how good the disco go's for a stock unit

Aint' that the truth ! :)

Is he happy with the STT's ?

Kev..

[greendisco2]

its his first serious 4x4 so i dont think he really seems to know how good they should or didnt perform on the weekend but for an aggresive tyre i thought they would have gripped a bit better. i 've got some vids and will try to upload them tonite:confused: at the moment i would rather the XPC'S:eek:

[big guy]

XPC's are arguably one of the best tyres ever made.
I am still wondering why they stopped manufacture.

Coopers are also very good, I am running their AT's currently and yes they do chip but the high mileage does make up and find them great as well as a few of my mates that run them as well as on a Porsche cayenne and once again great reports.

Please do not put them down in this thread as so far I really enjoyed the feedback.

[Slunnie]

XPC's are arguably one of the best tyres ever made.
I am still wondering why they stopped manufacture.

Coopers are also very good, I am running their AT's currently and yes they do chip but the high mileage does make up and find them great as well as a few of my mates that run them as well as on a Porsche cayenne and once again great reports.

Please do not put them down in this thread as so far I really enjoyed the feedback.
There is a better best. ;)

[greendisco2]

its funny some people love them some people loath them, some mates at work have the ST's and reckon they are it and a bit i need to get tyres for both the rangie and the disco and i dont know where to start:confused::confused::confused:.AT's for the disco and something more aggresive for the rangie:(. tony