Air pressure question

[MilesTeg]

2-Doors tend to run about 3-5 psi higher than 4-doors from what I've seen, with most 2-doors at 39 and 4-doors at 35 on the sticker. Also note there is a difference between cold and hot pressures on a tire, and that can vary by 2-5 psi, and it can change a bit with altitude as well.

That said, look up something called "Chalk Testing" - it's super simple to do, and optimizes your tire pressure for tire longevity (not fuel economy). Just need a piece of sidewalk chalk and a little stretch of flat pavement. On my larger tires, chalk test showed 28 cold, but I run them at 30 on the street - a compromise between a more comfortable ride / tire life and fuel economy.

You can also use Forscan to adjust when the low tire pressure warning comes on, if you care to adjust that as well.

I should really do a chalk test.

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[stetch]

Thanks everyone, I need to do some deflating. I still have under 1k miles, so still figuring this out. Crazy how overinflated they gave me the rig knowing I had a 300+ mile drive home

 

[AZ_Liberty]

I think Ford also errs higher (39psi) due to the Firestone/Explorer issue they had in the 90's when they recommended lower psi and it proved dangerous.

People like to blame the lower pressure on the door sticker, but mine were inflated to 35 PSI and threw off the tread in less than 1000 miles. Those tires were defective. Period.

That being said, Ford does overinflate for shipping. Part of PDI is to take the air pressure back to the door sticker, so if OP had high pressure leaving the lot, that's on the dealer.

 

[Nibroc99]

2-Doors tend to run about 3-5 psi higher than 4-doors from what I've seen, with most 2-doors at 39 and 4-doors at 35 on the sticker. Also note there is a difference between cold and hot pressures on a tire, and that can vary by 2-5 psi, and it can change a bit with altitude as well.

That said, look up something called "Chalk Testing" - it's super simple to do, and optimizes your tire pressure for tire longevity (not fuel economy). Just need a piece of sidewalk chalk and a little stretch of flat pavement. On my larger tires, chalk test showed 28 cold, but I run them at 30 on the street - a compromise between a more comfortable ride / tire life and fuel economy.

You can also use Forscan to adjust when the low tire pressure warning comes on, if you care to adjust that as well.

My 4-door sildtrak (sasquatch) is 39psi on the door sticker, fyi. Must depend on if it's sas or not.

 

[userdude]

People like to blame the lower pressure on the door sticker, but mine were inflated to 35 PSI and threw off the tread in less than 1000 miles. Those tires were defective. Period.

That being said, Ford does overinflate for shipping. Part of PDI is to take the air pressure back to the door sticker, so if OP had high pressure leaving the lot, that's on the dealer.

No doubt the tires were defective. Did a too-low psi force the issue for many? I guess that's what the lawyers would say. I dunno, I still prefer not to go too low. YMMV.

 

[mrjking2000]

28 psi on 37s unloaded (verified by chalk). 30-32 fully loaded.

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