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Tyre Pressures at Woodpecker WTF!

General Tech Talk

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Tyre Pressures at Woodpecker WTF!

Post 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?

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Last edited by Roctoy on Tue Dec 02, 2003 2:14 pm, edited 1 time in total.
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Post 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
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Post 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?
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Post by N*A*M »

i thought grimbo has just told someone else to do a search and was looking for flamage!
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Post 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 ;)
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Post 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.
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Post 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 :D :D :D

beadlocks off course??
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Post 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 :D :D :D

beadlocks off course??


Nah he had a flat ;)
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Post by redzook »

nope sam dosent have beadlocks :D
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Post 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
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Post by MissDrew »

Normaly I run around 6 to 8 psi but at Woodpecker I had about 25psi in them as I forgot to air down :oops: and yes I am STILL kicking myself for it :bad-words: :bad-words: :bad-words:
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Post by Shorty40 »

I ran about 7-8psi (38 TSLs - no beadlocks). Worked fine :cool:
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Post by XXXL80 »

mickbj42 wrote: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


:shock: :shock: :shock:
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Post by Heathx4 »

mickbj42 wrote:Matt ran 0 psi in all 4 boggers on his zook. No beadlocks

:shock:
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?
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Post by MKPatrolGuy »

Heathx4 wrote:
mickbj42 wrote:Matt ran 0 psi in all 4 boggers on his zook. No beadlocks

:shock:
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.
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Post by Heathx4 »

Haha, feeling a bit dumb now :oops:

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...
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Post by Webbie »

Guts wrote:Normaly I run around 6 to 8 psi but at Woodpecker I had about 25psi in them as I forgot to air down :oops: and yes I am STILL kicking myself for it :bad-words: :bad-words: :bad-words:

:lol: :lol: :lol: :lol: :armsup: :P yep its true we realized it on da way back :lol:
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Post 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.
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Post 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 :D
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Post 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!!!!
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Post by SAWZALL »

Yeah I'd say at Zuk weight and 44's you'd still have trouble bagging them at 0
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Post 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.
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