I don't do much DEEP mud here in So.Cal, so don't have a lot of experience with the stuff.
What do you guys run for tire pressure?
I've heard it both ways:
Spin them hard and tall, or float them soft.
:question:

personally i usually run em as i run on the street. that way i have another tactic for getting out if im stuck. just my personal opinon and practice.

I always air down. Most of the mud I wheel does not have a hard bottom so I like to get as big of a contact patch as possible. Im not a fan of the tall skinny mud tire either. Big, wide, low psi, and self cleaning is the way to go. Also better for the environment. (not digging trenches) But to each his own.

edit: I like to run 5 to 8 psi, but my tires shoot off the rim quite often. Need beadlocks!:eek:

http://www.alaskaoffroad.com/images/BoulderCreek01/72firstbeadBC.jpg

http://www.alaskaoffroad.com/images/BoulderCreek01/72thirdbeadBC.jpg

Last trip I lost a bead 3 times in about 6 feet! not having beadocks is :rainbow:

it depends on the type of mud, the depth, the tire size, the weigh of the vehicle, the ability to keep the tires spinning and clean, the type of tire (radial vs bias), the tread pattern, and how heavy your foot is


hope that helps :flipoff2:



















theres no set answer without filling in some of those variables, then I can try to give you a place to start..... then you can adjust it from there....


:usa:

Before my truck got stupid big I always aired down to 10psi. Thats low enough for flex but would keep my tire on the rim. I run my 54" Michelins at 5psi simply because they have sidewalls thicker than a bogger lug(M load rated!) and they barely flex then. Thats a comfort thing more than a traction thing. Who cares when you run 54"s, right? Post some pics if you find some mud!

I use 42''s on hummer beadlocks.
My ride wieghs 4300 lbs.
H.P. is a strong, mid 400s
Using the loud pedal is not a problem for me.
The mud/water could be 2-5 feet.

It's in Hollister, CA. and having never been there, can't say what the muds like.
It looks like I'll get one chance at driving it though.:D

Mud Boggers in Maine air down for competitions.
What they air down to is a trade secrete ;) :D

My frieds that run 44's on full sizes air down to the teens for the mud.

For competition, I use 5lbs front & 3lbs back. Wouldn't go lower than 10 for trails though.

TEX

I think Run'm soft and spin'm fast

ericfilar@fatcity

I saw some mud once!just ask YellowSub

I usually run 3-4 in the front and 2 in the rear, but I had a leak in my front driver last year, so it was usually 1 psi. :D

Originally posted by JR
I use 42''s on hummer beadlocks.
My ride wieghs 4300 lbs.
H.P. is a strong, mid 400s
Using the loud pedal is not a problem for me.
The mud/water could be 2-5 feet.

It's in Hollister, CA. and having never been there, can't say what the muds like.
It looks like I'll get one chance at driving it though.:D

Talking about the mud-pit for TTC? Here is a pic of the pic a few years ago during TTC

http://www.twistedaxle.com/trip/trip/images/ttc2k/ttcsmall1/052.JPG

The mud at Hollsiter is very sticky on the trails, but the pit is very soft. When not setup for a comp, the pit can vary from 0-5' of water with maybe 0-2' of soft muck at the bottom with deep ruts in the hardpack to all goo with 4-5' to the bottom to deeply rutted with several feet of soft muck on top.

Yellowsub is correct. Many variables.

On 44" boggers we ran at 15 psi at this pit ( 5-6 foot depth at end)

http://www.whiteknight.ca/f2robinb2.jpg

i run about 10 to 12psi all the time in my tires,mud or onroad.and i also like the tall skinny tires with narrow wheels for my toy...

with the info you provided, I would say take the "float across the top" method, it sounds like you have the HP to keep um spinning so go for it...also watch a few trucks in front of you and see how they do (this part sucks if you're first)... with beadlocks try 5 and 3 like TEX said....

In the bog races that fatcity was referring to, I ran 6psi in front and 4 in back - 37x13 boggers, 6200+ # Willys, 380HP, and a heavy foot.... the pit was about 3' in the deepest part but it was real gooey stuff...typical So Cal clay based dirt...


Good Luck!


:usa:

OK, another question:
High range or low. I'm serious. My gut is to go with low range, but maybe more tire speed is needed.


I use a stock geared C6 and a 3:1 t. case, with 5.27 axles.
Low range is good for about 25-30 mph, depending on how hard I want to work the valve springs.

Originally posted by Pavemen






The mud at Hollsiter is very sticky on the trails, but the pit is very soft. When not setup for a comp, the pit can vary from 0-5' of water with maybe 0-2' of soft muck at the bottom with deep ruts in the hardpack to all goo with 4-5' to the bottom to deeply rutted with several feet of soft muck on top.

Wol, wol, that ... doesn't seem so bad... I guess.:eek: :D

Eric, I told you I wanted one of those way high, treehouse models in your Fat City Off-Highway Vehicle catalog. But NO, you told me that low was good for deep mud.

If that sh*t gets any higher than my redneck, I quit!!

Unless you have a manual or manual valve body you have to go LOW. I see people make this mistake all the time (Mud Newbies). If the mud is deep at all you wont be able to get any tire speed in High. Its fun to watch though. The Newbie will fly off the line and all of a sudden his engine says :flipoff2: , I dont have the HP!! With 44" boggers, a 454, Turbo 400, and 4.56 gears I would run Low and 1st or 2nd gear. Then just keep it to the floor!!!

Originally posted by JR


Wol, wol, that ... doesn't seem so bad... I guess.:eek: :D

Eric, I told you I wanted one of those way high, treehouse models in your Fat City Off-Highway Vehicle catalog. But NO, you told me that low was good for deep mud.

If that sh*t gets any higher than my redneck, I quit!!

I told you no less than 5' between the tire and wheel well, BUT NOOOO!! you would'nt listen.:D

ericfilar@fatcity

Originally posted by Pavemen


Talking about the mud-pit for TTC? Here is a pic of the pic a few years ago during TTC
http://www.twistedaxle.com/trip/trip/images/ttc2k/ttcsmall1/052.JPG

.

I was there that year, it was'nt that bad.

3rd low... WOOD...lotso WOOD

ericfilar@fatcity

I was told that to pick the right gear for a mud pit, pick the highest gear that you can spin the tires off the line. For me (T18a/D20/3.73 - 33"TSL) is 4lo 3rd gear. Just enough torque and plenty of spin :D