Notice: We request that you don't just set up a new account at this time if you are a previous user.
If you used to be one of our moderators, please feel free to reach out to Chris via the facebook Outerlimits4x4 group and he will get you set back up with access should he need you.
Recovery:If you cannot access your old email address and don't remember your password, please click here to log a change of email address so you can do a password reset.

Onroad pressures

General Tech Talk

Moderators: toaddog, TWISTY, V8Patrol, Moderators

Forum rules
Post Reply
Posts: 96
Joined: Sat Nov 20, 2004 2:38 pm
Location: Newcastle

Onroad pressures

Post by Syzygy »

just got some 32" MTR's on my bundera and have no idea what pressure i should be running onroad...

i've got 33psi in them atm, the guy who fitted them put 36 in them.

I havn't driven on tyres like these before and i'm finding them a little more unpredictable than i expected... they are seeming to understeer or 'walk' on slight turning but if i turn more sharply they seem to really dig in and lurch the car more than expected. is this normal for the tyres and is it pressure dependent?

also finding them much noiser than i expected on cornering. It's like i'm hearing the tyres wearing away everytime i turn :? Very happy with the noise on straight driving though.
Top
Posts: 343
Joined: Fri Jun 18, 2004 3:25 pm
Location: Melbourne

Post by EricB »

I found 36 on road to be nice without too much movement
Top
Posts: 14209
Joined: Sun Jan 11, 2004 11:36 am
Location: Adelaide

Post by -Scott- »

Without knowing your vehicle (and hence it's weight) it's difficult to speak from experience.

The characteristics you describe sound like your tyres are under-inflated. During initial turn-in you're bending sidewalls rather than turning. Then when you pull sharper nothing is left to give, and it lurches around. The noise behaviour also suggests you're running too much on your side lugs during turns.

FWIW, I run my 285/75-16 MT/Rs at 38psi, in a 4by with a 1700kg kerb mass. 2wd on dirt understeers terribly, but 4wd handles pretty nice. 2wd on bitumen strikes me as pretty good, considering my suspension setup. ;)

Cheers,

Scott
Top
Posts: 5803
Joined: Wed Feb 19, 2003 3:02 pm
Location: Brisbane

Post by ISUZUROVER »

From my experience I found my MTR's to be a very soft, flexible tyre, and needed to be inflated quite high to have good road manners. I run my 285/75-16's at 40-45psi on road (on a Land Rover - about 1900kg). At high pressures though they have better handling and traction on bitumen than my 235/85-16 road tyres.
_____________________________________________________________
RUFF wrote:Beally STFU Your becoming a real PITA.
Top
Posts: 766
Joined: Sun Aug 01, 2004 7:16 pm
Location: brisbane

Post by bruiser »

I reckon anywher from 32 - 40.

Closer to 40 and you will get better wear out of the tyre. leas traction and rougher ride

Closer to 30 and you will get a beter ride and grip on the road but you will tend to wear them premature especially on the edges unless you take all cornes at 5 k's/hr

I run 38 :)
Top
Posts: 2915
Joined: Tue Oct 05, 2004 11:29 am
Location: Sunshine Coast

Post by Bingham »

as an aside ----correct me if im wrong but on mtrs 33 and 35's max pressure 35psi....
i ran at 30 both of these with no dramas...... run claws now at 28
2015 200 Series Gx TTD - ................ Fark 3L's -
Top
Posts: 1826
Joined: Wed Mar 03, 2004 9:14 pm
Location: nsw

Post by plowy »

most recomend 32 psi a good pressure to run
Top
Posts: 601
Joined: Mon Nov 15, 2004 6:52 pm
Location: North West Melbourne

Contact:
Contact dwaynes

Post by dwaynes »

i run mine at 38psi anything lower i get the dreaded wobble
www.mudrhino.com.au
Top
Posts: 2097
Joined: Mon Jun 14, 2004 8:06 pm
Location: Land of Plenty

Post by blkmav »

36 dead cold which is about 40 hot
Weekdays - Prado GXL D4D with some stuff
Weekends - Mav shorty with lots of stuff
Top
Posts: 3189
Joined: Thu Mar 04, 2004 1:11 pm
Location: Jimboomba

Post by BIG GQ »

Dont ask me for an opinion cause I'm so farken lazy I'll quite opten drive the 37" claws at 10-12psi on the road :D
Cheers
Linc

[quote="chimpboy"]Punctuation is the difference between 'I helped my Uncle Jack off his horse' and 'I helped my uncle jack off his horse.'[/quote]
Top
Posts: 111
Joined: Mon Jan 17, 2005 1:54 pm
Location: Gold Coast - Australia

Post by Gobbles »

i do what blkmav does run them at 36 so when driving they expand to 40......

Is it a higher tyre pressure that increases Tread wear or a lower one becasue there is more surface area?
'92 MU - 2.8 TD - Stock as a rock - Panel Damage Chariot
Top
Posts: 1321
Joined: Tue Aug 03, 2004 7:56 pm
Location: Jamisiontown NSW

Post by MARKx4 »

When i had my 33" MTR's i ran them at 35psi cold tempture and that was ok for my MK shorty.
Its not cool, unless it's got boost :)
Top
Posts: 1170
Joined: Tue Jun 01, 2004 4:27 pm
Location: Goodna, Queensland

Post by Bartso »

Bingham wrote:as an aside ----correct me if im wrong but on mtrs 33 and 35's max pressure 35psi....
i ran at 30 both of these with no dramas...... run claws now at 28

:shock: i run mine at 40 mate better wear
MUD BEERS & MAYHEM 4x4 & SOCIAL Group
[url=http://www.fourbys.com.au/]Fourby's tyre and mechanical[/url]
[url=http://www.4wdmonthly.com.au/forum/showthread.php?t=24441/]My build up for ttc[/url]
Top
Posts: 14209
Joined: Sun Jan 11, 2004 11:36 am
Location: Adelaide

Post by -Scott- »

Gobbles wrote:i do what blkmav does run them at 36 so when driving they expand to 40......

Is it a higher tyre pressure that increases Tread wear or a lower one becasue there is more surface area?


If pressure is too low you'll wear the shoulders but not the middle of the tread.

If pressure it too high you'll wear the centre of the tread but not the shoulders.

If pressure is just right you'll wear them evenly - unless your driving style or wheel alignment comes into play. ;)

Cheers,

Scott
Top
Post Reply

Return to “General Tech”

Who is online

Users browsing this forum: No registered users and 52 guests