PSI w/ Mud Terrian???

YeloSub7 · 10-04-2005, 12:16 AM

What psi do you guys run your m/t and such on road for normal daily driving? I have heard 25-30 or the 35 max pressure in some tires? What is optimal for longer treadwear?

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Elton · 10-04-2005, 12:31 AM

i run 35 psi in my tires

jimbo74 · 10-04-2005, 12:39 AM

this is a very subjective question, there is no set psi for anyone to run every tire at.... no 2 situations or vehicles or conditions are ever the same.... industry standard on a truck/suv is between 30-35 psi with 32 being the general rule of thumb

i currently have 31s on my truck and i am running them @ 50 psi which is the max for the bfgs i have, for best fuel economy, eventually this will wear down the center part of the tread, but i have mroe tires in the backyard i can switch to when that happens..... tires vary in max pressures so check the tire itself for max inflation... some max out at only 35 psi, otehrs 50, others more

bob200587 · 10-04-2005, 01:05 AM

32psi

NathanBERG · 10-04-2005, 01:56 AM

I run 32 to 35 Highway and Air down to about 25 off road. Depending on the terrain of course.

Adam F · 10-04-2005, 06:54 AM

with my 36" swampers, I run about 28 for normal conditions. I tried 35 on the highway and it was too stiff and rode bad.

ebelen1 · 10-04-2005, 07:06 AM

On my AT's, I run 38 but they're brand new and I wanted to try out a couple of different psi's before I stuck to one. 34 is next and according to Jason B, moving from 32 to 34 for him gained him 2 extra mpg.

FilthyRich · 10-04-2005, 07:40 AM

285 MT/Ts 35 psi on road

snap-on · 10-04-2005, 08:27 AM

My Kumho MT's have a max load rateing at 50psi. When hauling in my pickup i run 45-50psi. fronts are 35-40

trail pressures in the 18-25psi range depending on how much ground clearance i need

YeloSub7 · 10-04-2005, 02:41 PM

so for better mpg, run the tires closer to max pressure?

Glenn · 10-04-2005, 02:44 PM

35 Psi.

jimbo74 · 10-04-2005, 02:45 PM

Quote:

Originally Posted by YeloSub7

so for better mpg, run the tires closer to max pressure?

that will get better mpg, but at the sacrifice possibly of ride quality and tires going bald in the middle mroe than the edges

Glenn · 10-04-2005, 02:51 PM

Quote:

Originally Posted by jimabena74

...i currently have 31s on my truck and i am running them @ 50 psi which is the max for the bfgs i have,

The only thing that comes to mind with 50 P.S.I. in your tires is an increased change of a blow out. You don't drive to save gas.

jimbo74 · 10-04-2005, 02:56 PM

Quote:

Originally Posted by Glenn

The only thing that comes to mind with 50 P.S.I. in your tires is an increased change of a blow out. You don't drive to save gas.

what is my increased chance of a blow out? the tires are rated to have 50 psi cold in them.... i actually run 44 psi cold... but used 50 as a general number... i don't drive t osave gas, however, i do a lot of hiway driving and at the pressure i run at my truck is awesome on the highway.... the 3.07 gears and the around 31" tall of my 31" tires helps out on gas mileage and top speed

Silver_Truck · 10-04-2005, 02:59 PM

i run mine at 20 psi

Glenn · 10-04-2005, 03:10 PM

Quote:

Originally Posted by jimabena74

what is my increased chance of a blow out? the tires are rated to have 50 psi cold in them.... i actually run 44 psi cold... but used 50 as a general number... i don't drive t osave gas, however, i do a lot of hiway driving and at the pressure i run at my truck is awesome on the highway.... the 3.07 gears and the around 31" tall of my 31" tires helps out on gas mileage and top speed

Because you run them at their max, you have less margin for the tire holding up to the inevitable stresses of driving. Cornering, braking, going over railroad tracks, etc. 50 is usually for carrying heavy loads.

Flamedx4 · 10-04-2005, 03:13 PM

Lessee, I have 15.5 in one, 21 in another, those are the rears. Then 18.5 in the right front and 37 in the left front. After I get the 'steering' and 'alignment' and 'rear diff whine' problems fixed, I'm adjust that air pressure...Might even buy some new tires, get all 4 of them the same size this time...

YeloSub7 · 10-04-2005, 03:53 PM

thats why I said the closer you are to the max pressure, obviously its not smart to run them at max psi. the rest is just personal prefference of ride credability...

YeloSub7 · 10-04-2005, 03:53 PM

thatnks for helping me process...

Ironmike4x4 · 10-04-2005, 04:06 PM

From this site I found out about the "chalk test" and tried it out on my BFG A/T's. I found that around 45 psi was the optimal for my tires. Too much and the center will wear quickly and give a rough ride. Too little the outside tires wear faster and loses gas mileage.

nermalgod · 10-04-2005, 09:22 PM

I seem to recall that the findings involving Ford Explorers rolling over and playing dead on Firestone tires were because of under-inflation; people airing down to get a better ride. We're talking about trucks and 4Runners here. If you can't handle a rough ride buy a sedan.

As for me, I run mine at 50psi.

Ironmike4x4 · 10-04-2005, 09:31 PM

Quote:

Originally Posted by nermalgod

I seem to recall that the findings involving Ford Explorers rolling over and playing dead on Firestone tires were because of under-inflation; people airing down to get a better ride.
.

Bingo

Flamedx4 · 10-05-2005, 11:19 AM

Quote:

Originally Posted by Ironmike4x4

From this site I found out about the "chalk test" and tried it out on my BFG A/T's. I found that around 45 psi was the optimal for my tires. Too much and the center will wear quickly and give a rough ride. Too little the outside tires wear faster and loses gas mileage.

Bingo.
When I put on new tires, I just watch as the nubs wear off. Adjust until the tread surface wears evenly.

Note that on really big tires this isn't really possible. My 35s would need to be at about 12 pounds to get even wear. Rides like an old Honda 3 wheeler (bouncy bouncy mushy bouncy) at that kind of pressure, plus consumes gas like crazy. Rides the best at about 40, but then wears out the center of the tread face really fast. So I compromise, and rotate often.

10-04-2005, 12:31 AM	#2 (permalink)
Elton Contributing Member Join Date: Jul 2005 Location: Siletz,Oregon Posts: 10,648	i run 35 psi in my tires __________________ My Truck 98 4runner SR5 3.4L 5spd 4x4 E-Locker Mods Mom 07 Tundra d-cab limited 5.7L 4x4 auto sister 92 pickup SR5 X-cab 3.0L 5spd 4x4 Papa 89 Pickup SR5 X-cab 4x4 3.0L 5spd/98 4runner SR5 4x4 auto 3.4L R.I.P 91 4runner SR5 4x4 3.0L 5spd Totaled 5/13/06 My Wreck

10-04-2005, 12:39 AM	#3 (permalink)
jimbo74 Banned Join Date: Jan 2004 Location: Nor*Cal Posts: 6,582	this is a very subjective question, there is no set psi for anyone to run every tire at.... no 2 situations or vehicles or conditions are ever the same.... industry standard on a truck/suv is between 30-35 psi with 32 being the general rule of thumb i currently have 31s on my truck and i am running them @ 50 psi which is the max for the bfgs i have, for best fuel economy, eventually this will wear down the center part of the tread, but i have mroe tires in the backyard i can switch to when that happens..... tires vary in max pressures so check the tire itself for max inflation... some max out at only 35 psi, otehrs 50, others more Last edited by jimabena74; 10-04-2005 at 12:40 AM.

10-04-2005, 01:05 AM	#4 (permalink)
bob200587 Contributing Member Join Date: Feb 2005 Location: Nashville, TN Posts: 2,853	32psi __________________ 87 4runner 4x4 SR5 22RE ARB Bull Bar, 31X10.50 Mastercraft M/T's, Stock 4.10 Gears, Flowmaster Muffler, LCE Header AISIN Manual Hubs, Marlin Crawler Sliders 190XXX miles

10-04-2005, 01:56 AM	#5 (permalink)
NathanBERG Registered User Join Date: Jul 2004 Location: Washington State Posts: 359	I run 32 to 35 Highway and Air down to about 25 off road. Depending on the terrain of course. __________________ 1990 4Runner 4x4 3.0 Auto. Sitting on 31X10.50 Baja Claws, Aisin manual hubs, OME shocks & coils. Optima Redtop, 40 Series Flowmaster and High flow Cat

10-04-2005, 06:54 AM	#6 (permalink)
Adam F Registered User Join Date: May 2002 Location: Cincinnati Ohio Posts: 2,398	with my 36" swampers, I run about 28 for normal conditions. I tried 35 on the highway and it was too stiff and rode bad. __________________ 88 4Runner. 350 V8, R150 5-speed. SAS, 36" TSL's, elocker rear

10-04-2005, 07:06 AM	#7 (permalink)
ebelen1 Contributing Member Join Date: Jul 2005 Location: Socal Posts: 1,964	On my AT's, I run 38 but they're brand new and I wanted to try out a couple of different psi's before I stuck to one. 34 is next and according to Jason B, moving from 32 to 34 for him gained him 2 extra mpg.

10-04-2005, 08:27 AM	#9 (permalink)
snap-on Registered User Join Date: Aug 2005 Location: STL MO Posts: 2,382	My Kumho MT's have a max load rateing at 50psi. When hauling in my pickup i run 45-50psi. fronts are 35-40 trail pressures in the 18-25psi range depending on how much ground clearance i need __________________ 94 EX cab, 5speed, V6, locked, ARB bar, NWOR headers 92 4runner, auto, V6, OME suspension, Downey headers

10-04-2005, 02:41 PM	#10 (permalink)
YeloSub7 Contributing Member Join Date: Mar 2005 Location: San Jose, CA Posts: 897	so for better mpg, run the tires closer to max pressure? __________________ -Jake 1990 4Runner <> 1990 Toyota 4Runner-22RE-5 speed-TG 3" front/4" rear-35" BFG M/T-4.88's-rear LSD-front TruTrac-MC Rear Bumper-TG DOM Sliders-TG Front Bumper SAS Build-Up Old Rigs: '85 4Runner (RIP) '95 4Runner (sold)

10-04-2005, 02:44 PM	#11 (permalink)
Glenn Registered User Join Date: Mar 2003 Location: ELN Posts: 1,651	35 Psi. __________________ -Glenn-

10-04-2005, 02:59 PM	#15 (permalink)
Silver_Truck Contributing Member Join Date: Oct 2004 Location: B'ham, WA Posts: 1,820	i run mine at 20 psi __________________ -Geoff *1991 Toyota Pickup Ext. Cab SR5 4x4 V6 5 spd K&N intake, port & polished heads with OS valves, port & polished intake manifold and plenum, NWOR headers and crossover, NWOR catback, Denso Iridium plugs, Redline Fluids, 4.88s, Rear LockRight, Aisin hubs, Chevy springs, BJ spacers, 2" RB body lift, 34x10.5 Swamper LTBs, WolphisWorks Sliders and bumpers, 400,000 mi.

10-04-2005, 03:13 PM	#17 (permalink)
Flamedx4 Registered User Join Date: May 2004 Location: 100 miles offshore as much as possible, & Springfield Oregon USA Posts: 3,285	Lessee, I have 15.5 in one, 21 in another, those are the rears. Then 18.5 in the right front and 37 in the left front. After I get the 'steering' and 'alignment' and 'rear diff whine' problems fixed, I'm adjust that air pressure...Might even buy some new tires, get all 4 of them the same size this time... __________________ All my Yotas are gone. Stuff to sell: http://www.yotatech.com/showthread.p...39#post1009839 -Phil Last edited by Flamedx4; 10-04-2005 at 03:14 PM.

10-04-2005, 03:53 PM	#18 (permalink)
YeloSub7 Contributing Member Join Date: Mar 2005 Location: San Jose, CA Posts: 897	thats why I said the closer you are to the max pressure, obviously its not smart to run them at max psi. the rest is just personal prefference of ride credability... __________________ -Jake 1990 4Runner <> 1990 Toyota 4Runner-22RE-5 speed-TG 3" front/4" rear-35" BFG M/T-4.88's-rear LSD-front TruTrac-MC Rear Bumper-TG DOM Sliders-TG Front Bumper SAS Build-Up Old Rigs: '85 4Runner (RIP) '95 4Runner (sold)

10-04-2005, 03:53 PM	#19 (permalink)
YeloSub7 Contributing Member Join Date: Mar 2005 Location: San Jose, CA Posts: 897	thatnks for helping me process... __________________ -Jake 1990 4Runner <> 1990 Toyota 4Runner-22RE-5 speed-TG 3" front/4" rear-35" BFG M/T-4.88's-rear LSD-front TruTrac-MC Rear Bumper-TG DOM Sliders-TG Front Bumper SAS Build-Up Old Rigs: '85 4Runner (RIP) '95 4Runner (sold)

10-04-2005, 09:22 PM	#21 (permalink)
nermalgod Registered User Join Date: Sep 2005 Location: Madison, WI Posts: 245	I seem to recall that the findings involving Ford Explorers rolling over and playing dead on Firestone tires were because of under-inflation; people airing down to get a better ride. We're talking about trucks and 4Runners here. If you can't handle a rough ride buy a sedan. As for me, I run mine at 50psi.

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