Tire pressure. - Ford Powerstroke Diesel Forum
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post #1 of 18 Old 07-23-2010, 10:19 AM Thread Starter
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Tire pressure.

I just got my first Excursion 4 days ago and I'm loving it so far. It drives so much better than my ex. cab 250 did. My question is what PSI do you guys run in stock 265 size tires. I was thinking 80 because of fuel milage and the truck weight of 7190 pounds. But I know that my 250 rode a lot better at 65 all the way around. Thanks.
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post #2 of 18 Old 07-23-2010, 01:55 PM
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i just go with what the door says, or 55 all the way around, if im wrong id like to know also.

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post #3 of 18 Old 07-25-2010, 07:09 PM
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I run mine 55-60 in the front and 70 in the rear. That's what I ran in the stock size tires and what's on it now (285's). I would make sure you have "E" rated tires before you pump a lot of air in them.

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post #4 of 18 Old 07-26-2010, 05:34 AM
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I've played a little bit w/ tire pressures and have found on my stock BFG AT KO's that front at 60 and rears at 55 (no load or towing) seems to be the best ride and handling. Didn't notice what engine you have. The PSD is heavier than the V10.

When I start to tow I increase the rear to 65 but leave the front at 60.

It's well within the load limit of the tires (E rated), gives a good contact patch, and does not "wander" but then my tongue weight is light at 1000#. I'd suggest you go to a scale and weight the beast with a full load of fuel and the driver (front and rear) so you have an idea what loads are actually being carried.

The other thing you can do is the "Chaulk test". Run a couple of lines across the tread with chaulk and then move the truck forward until a couple of revolutions of the tire have taken place. Check the Chaulk mark and see if it is evenly "worn".

D

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post #5 of 18 Old 07-26-2010, 05:25 PM
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Originally Posted by TXSailor View Post
I've played a little bit w/ tire pressures and have found on my stock BFG AT KO's that front at 60 and rears at 55 (no load or towing) seems to be the best ride and handling. Didn't notice what engine you have. The PSD is heavier than the V10.

When I start to tow I increase the rear to 65 but leave the front at 60.

It's well within the load limit of the tires (E rated), gives a good contact patch, and does not "wander" but then my tongue weight is light at 1000#. I'd suggest you go to a scale and weight the beast with a full load of fuel and the driver (front and rear) so you have an idea what loads are actually being carried.

The other thing you can do is the "Chaulk test". Run a couple of lines across the tread with chaulk and then move the truck forward until a couple of revolutions of the tire have taken place. Check the Chaulk mark and see if it is evenly "worn".

D
I do the same when towing also

Osk- 2000 Excursion XLT
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post #6 of 18 Old 07-26-2010, 07:28 PM
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Don't set your pressure according to the load rating. When I had my Procomps installed, I was surprised to find that they only hold 65PSI even tho there E rated. Bottom line, regardless of what you decide to set them at, make sure it's within the range printed on the side of the tire.

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post #7 of 18 Old 07-27-2010, 05:31 AM Thread Starter
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They are Firestone Transforce A/T's load range E. The tire says max load 80 psi and the drivers door says 50 in the front 55 in the rear. Im going on a long trip in a couple of days and I think I'll set them on 55 psi all the way around.
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post #8 of 18 Old 07-27-2010, 06:01 AM
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I don't remember the year but at some point Ford changed from Load Range D tires as the reccomendation/OEM for Excursions to Load Range E. When they did that they applied the reccomendation to ALL year Excursions even the ones that came from the Factory w/ Load Range D tires.

I did not see the year of your EX but on my 2002 that is what happended. The door sticker and inside the Fuel Door says Load Range D and the lower pressure 65 psi, but the E's are much higher.

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post #9 of 18 Old 07-28-2010, 04:58 AM Thread Starter
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Mine is an 01 ex. Im not sure what it had from the factory but it had new load range E tires when I got it. I set them to 55 but I dont think 65 would hurt anything. I want the best mpg but I dont want it to ride like a tank.
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post #10 of 18 Old 07-28-2010, 05:45 AM
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Since the E Range tire sidewalls are so much stiffer than D's, I keep mine at the "lighter" end of the pressure and pretty much never go over 65 psi (even when towing).

The chaulk test will tell you if the are under inflated at 65.

D

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