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Old 08-24-2010, 08:52 PM   #1
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Tire air pressure

1) i did search
2) i a lazy

BFG All Terrain T/A KO
Load range E
LT 285 75 R 16

2001 E350 EB SMB w/ Cruiser Top
Wilson weights in at 10,000 pounds loaded

States 80 psi

running at 70 psi now

What should i run highway pressure?

How low can i go for off road?

( i have a viair compressor)

thanx in advance
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Old 08-24-2010, 10:50 PM   #2
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Re: Tire air pressure

Bill, I am sure you know already but if no one has your numbers for you check the manufactures website for your tire and weight per axle. I weighed all my vehicles once by the axle and then checked the website and all the tires were way off. All the vehicles ride much better now.

My dually truck camper was the most off and made the most improvement in ride when adjusted correctly.
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Old 08-24-2010, 11:59 PM   #3
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Re: Tire air pressure

Here ya go


viewtopic.php?f=3&t=1582
viewtopic.php?f=2&t=3520
viewtopic.php?f=39&t=1500
viewtopic.php?f=3&t=1580
viewtopic.php?f=2&t=1321
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Old 08-25-2010, 07:00 AM   #4
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Re: Tire air pressure


got it HOWEVER
no concenus

seems to run 55 to 70 psi

hmmmm
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Old 08-25-2010, 09:00 AM   #5
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Re: Tire air pressure

My Michelins say 80 cold on the sidewall.

When I got it from Quadvan, they ran them at 65. I kept them there for a while. Now I run the rears at 70 and the fronts at 65. I may move the fronts up to 70, too. I don't see the need to run at the max.

As for how low, that's a good question. I guess if you were stuck in sand, you could take them down to 20, but not sure they'd stay on. For constant running offroad at low PSI, I have no idea. I would not feel safe taking them below 45 or 50, but I am not an expert and my vehicle weights 9000 pounds.
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Old 08-25-2010, 01:54 PM   #6
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Re: Tire air pressure

Going low and keeping the tire on depends on how wide your rim is, plus how stiff the tires are, and what you're doing. You can use chalk to see when airing down causes the tire on the road surface to turn concave, or just air down until you see a nice bulge. I've been down to 25psi in the van when I had the BFG ATs with no problems.
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Old 08-26-2010, 08:25 AM   #7
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Re: Tire air pressure

My rule of thumb for washboard roads is 35/35...air down to 35 and drive at 35 (we are running 285-75-R16 BFGs). It still puts a beating on the suspension but if you have 25 miles of wash board road in front of you, it would take forever if you don't air down and move out...
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Old 08-26-2010, 08:45 PM   #8
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Re: Tire air pressure

2003 E-350 RB @ ~ 10k lbs running 285 75 R16 BFG AT's, load range E.

30-35psi for sand/rocks, 25 mph max.
40-45psi for washboard, 35 mph max.
50-55 for airing back up on rural pavement with scuba tank, 60 mph max.
65 psi for driving on the hiway/freeway airing up at the gas station, 75 mph max.

Stuck in the sand, 20 psi.
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Old 08-27-2010, 09:29 PM   #9
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Re: Tire air pressure

jstanley, those numbers sound good to me, too.

how come I never hear anybody talk the "5 or 50 rule" for washboard?

that used to be talked about a lot on the old Wagoneer BBS's I used to frequent. You either do 5mph and creep or do 50 and it levels off.

that being said, I sometimes get nervous at even the idea of doing 50 on bad washboard - or any dirt - in the van. In the Tacoma, it was one thing, but in the Econoline, it's another ballgame.

Paul
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Old 08-27-2010, 09:44 PM   #10
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Re: Tire air pressure

50 mph in the van on washboards and you would have to be crazy! It would probably shake itself to death. Also no control of a heavy ass van what so ever!
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