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Tyre Pressures at Woodpecker WTF!
Posted: Mon Dec 01, 2003 8:32 am
by Roctoy
Was there a rule at Woodpecker 2003 that stated you had to run road pressures in your tyres? These guys have big bouncy 38 inch + size tyres most on beadlocked rims and none of them seemed to air down. I run 5psi in my 35's when i'm wheelin and it makes shyteloads of difference in traction.
WHAT THA?
Posted: Mon Dec 01, 2003 8:34 pm
by hotrod4x4
yeah i had noticed that on quite a few vehicles also
but not sure of any ruling , and doubt if there would have been as there has never been before
just driver preference possibly
as more air means more ground clearance if needed
Posted: Tue Dec 02, 2003 11:37 am
by grimbo
you may get an answer to this if you change your subject title to something like Tyre pressures at Woodpecker or something like that. I reckon most people would assume this was another stupid question like what tyre pressure should I run?
Posted: Tue Dec 02, 2003 1:22 pm
by N*A*M
i thought grimbo has just told someone else to do a search and was looking for flamage!
Posted: Tue Dec 02, 2003 1:30 pm
by greg
N*A*M wrote:i thought grimbo has just told someone else to do a search and was looking for flamage!
he seems to have calmed down after his little holiday - i'm sure it won't take too long for the lovely melbourne climate to warm him back up into being a grump again though
Posted: Tue Dec 02, 2003 1:40 pm
by OVERKILL ENG
There is no rule about tyre pressures for woodpecker.
Everyone has a different oppinion on even what road pressures are I don't think they could police it. We ran 2psi.
SAM
Posted: Tue Dec 02, 2003 2:31 pm
by XXXL80
overkill wrote:There is no rule about tyre pressures for woodpecker.
Everyone has a different oppinion on even what road pressures are I don't think they could police it. We ran 2psi.
SAM
2PSI
beadlocks off course??
Posted: Tue Dec 02, 2003 4:23 pm
by Wooders
XXXL80 wrote:overkill wrote:There is no rule about tyre pressures for woodpecker.
Everyone has a different oppinion on even what road pressures are I don't think they could police it. We ran 2psi.
SAM
2PSI
beadlocks off course??
Nah he had a flat
Posted: Tue Dec 02, 2003 4:50 pm
by redzook
nope sam dosent have beadlocks
Posted: Tue Dec 02, 2003 7:05 pm
by M&M Custom Engineerin
i ran 2.5psi in the front and 1.5psi in the rear of mine. No beadlocks.
Matt ran 0 psi in all 4 boggers on his zook. No beadlocks
Posted: Tue Dec 02, 2003 7:16 pm
by MissDrew
Posted: Tue Dec 02, 2003 9:54 pm
by Shorty40
I ran about 7-8psi (38 TSLs - no beadlocks). Worked fine
Posted: Wed Dec 03, 2003 8:09 am
by XXXL80
Posted: Wed Dec 03, 2003 8:15 am
by Heathx4
mickbj42 wrote:Matt ran 0 psi in all 4 boggers on his zook. No beadlocks
Matt had a vacuum in his tyres? Neglecting popping a bead for now, is there reason to be concerned that the rim might spin inside the tyre?
Posted: Wed Dec 03, 2003 12:04 pm
by MKPatrolGuy
Heathx4 wrote:mickbj42 wrote:Matt ran 0 psi in all 4 boggers on his zook. No beadlocks
Matt had a vacuum in his tyres? Neglecting popping a bead for now, is there reason to be concerned that the rim might spin inside the tyre?
If he had a vacuum in his tyres he would have had -1 psi for example. Someone correct me if I'm wrong, but I'm guessing he just had the tyre off the ground and pulled the valve core, and just equalised the pressure in the tyre with the outside air. It isn't the air pressure that supports the vehicle, it is the volume.
Posted: Wed Dec 03, 2003 12:49 pm
by Heathx4
Haha, feeling a bit dumb now
We've just had a bit of a funny conversation about it here in the (engineering) office. Of course, all these tyre pressures are measured relative to the air outside. So 0 psi is not 0 psi - it is of course, 0 psi above 1 atmosphere (about 14.7 psi).
The pressure differential is 0 psi. It is not very useful to talk about absolute pressures, especially when talking about Earth based tyres.
Right, anyway, sorry to steal the thread, you may return to your usual programming now.
PS. I still don't know whether the rim turning inside the tyre at low pressures is a concern...
air
Posted: Wed Dec 03, 2003 9:58 pm
by Webbie
Posted: Thu Dec 04, 2003 9:07 pm
by +dj_hansen+
Abuse me if im wrong.. but surely running 0 psi in your tyres, u risk damaging the rims? i guess there is a fair amount of rubber in say a 38 TSL, but if u hit a rock or log hard, that would hafta hurt, air or no air.
Posted: Thu Dec 04, 2003 9:09 pm
by +dj_hansen+
Also... what about serious sidewall damage, i have seen a few tyres come off the beach that have been run really low and have been worn down to the canvas, surely in a rock and in a rut, it would have the same effect?
LIke i said, abuse me if i wrong
Posted: Thu Dec 04, 2003 9:28 pm
by POS
+dj_hansen+ wrote:Abuse me if im wrong.. but surely running 0 psi in your tyres, u risk damaging the rims? i guess there is a fair amount of rubber in say a 38 TSL, but if u hit a rock or log hard, that would hafta hurt, air or no air.
You will find that a lot of guys running BIG swampers on light rigs or Baja Claws will often run 0 psi.
The reason being is that they have a heavy side wall compared to the BFG's and Mtr's!
Also the Volume is a lot bigger!
My Claws look like they are fully inflated with 0 psi in them!!!!
Posted: Thu Dec 04, 2003 10:27 pm
by SAWZALL
Yeah I'd say at Zuk weight and 44's you'd still have trouble bagging them at 0
Posted: Sat Nov 19, 2005 10:39 am
by thunder
sorry to bring up an old tread but.
I will be having 38.5x11 boggers on 16x8 flipped rims
ON my gu ute about 2.3 tonne and what pressure do you guys think?
Im thinking 8 in the rear and between 12-16 in the front .But i drive it
ballistically HARD
At nissan trials i had 37 claws that were beadlocked so not a problem.
I have in the past lost a bead on the front at 18psi (bfg)Gu wagon
and the rear 16psi (claw) Gu wagon.
I will not have a spare if i fuk up the bead.
AT the end of a stage you get 5 minutes to fix things.
PS this is the 1st time i have had these tyres/rims on a track.
yep its true we realized it on da way back