i have stock type tires on my 2000 excursion it has a 7.3 diesel and is a 4x4, the tires are 16" variety in stock size

i was wondering what everyone ran their pressure at?

mine say MAX 80 LBS cold

so i have been running them for almost a year at 40psi.. and last night upped it to all 4 tires at 75 PSI, wondering if this will be better

hard to do the chalk trick now cause it ice and snow all over.

 

in the winter i allways drop my pressure alot to keep more contact patch with the road..makes a huge differance. i have mine around 30psi right now. summer i run about 60psi. i dont tow anything thought but that is with E rated tires.

my expedition which also has E rated 265/75s i have at 22psi right now because they are not snow tires and it needs all the help it can get to get stopped.

 

i got studds on so maybe that will force them into the ice more at 75lbs probably drop it down this summer without the studds and try 60-65

 

yeah i have studds also with the excursion. dropping the pressure made a huge differance in stopping distace for me anyhow.

 

Check the recommended pressure. It's printed on the door pillar just behind the drivers side door when it is open. That is the baseline to work from. The rule of thumb I am using...

Towing: Max 80psi (keeps the sidewall firm and avoids tire overheating)
Snow: 5-10psi below the recommended
All other times: recommended pressure

With your extremes in Alaska, I think AlaskanEx is on the right track. What do others think?

 

depends 100% on the tire make/model...call them up and see exactly what they say.
each tire is going to act differently in each situation. Unless you're keeping the speed WAY down, cutting your pressure in half is never going to be a good plan. I go between 65-80 on mine depending if I'm towing, only time I have gone below that is on the beach for traction, then I'm down to 18, but that's under 15mph and no sharp turns to roll the sidewall...keep in mind it is a 4 ton truck, with a sloppy sidewall, it's not going to be a good thing.

 

I keep my BFG E-rated AT's at 80psi when towing, and at 65psi the rest of the time. I don't drive in the snow much, but might consider going down to 50-55psi if I knew the weather was going to be bad.

30psi in a 4-ton X on the street? That's too low for me.

Mark

 

I have the BFG Rugged Trail T/A E's on mine...thru some experimentation I have found that for my likes...too high a tire pressure actually made my Ex handle like she was on marbles or ice...very un-nerving.

The door jamb "recommended" pressure WILL achieve your full GAWR's. Anything above the door jamb pressure is for personal likes/tuning.

I've found that for my Ex with my tires and my likes I use 60psi front and 70psi rear for towing...in the winter I do not necessarily adjust the pressure up to account for the drop in pressure due to the cold weather/temps...so when spring/summer comes back around...it naturally rises back to near my 60/70 number.

Many on here run 80psi...but like I said...I found that the handling of my Ex was negatively effected...I have a small personal theroy that high tire pressures may account for some folks handling ill's on their Ex and they don't even know that is the culprit...but I have no real facts to back that up...just a number of years on these boards reading and posting and making mental notes.

Good luck,
Joe.

 

The door jamb numbers are a good point to be at for most daily driving. It can vary slightly depending on what type of tires, tread, etc. If you need the maximum load capacity you have to be at the maximum air pressure - so in this case it would be 80psi.

 

I run 75 psi on my Michelin AT/2 load range E and it does great. You feel the bumps and cracks in the pavement, though.

 

Michelin m/s stock size e rated 4x4 6.0 60 front 65 rear.
I agree with x hemi on the too high of tire pressure makes mine go all over the road. And I have the v/b code springs and billstein shocks setup.

 

can you guys post up your engine also so i can see what the other diesel excursion are running since they are more front heavy

 

7.3 4x4. Plate says 50F/55R. I tend to run 65 normally, 80 towing.

Mark

 

2001 XLT 7.3 diesel 4x4, I run 65psi front and rear. Mine feels like poo any higher and any lower its all over the road like I have a flat.

 

I'm with pmgo4th, I run 65 in all 4. Any less and truck loses mpg and feels like jello .Anything over 70 tires ride like cement wheels. Gas engine