Proper Tire Pressure
02-25-2014, 05:20 PM
#12
Senior Member
02-25-2014, 07:28 PM
#13
Beer Drinkin Hell Raiser
psi that the door jam says. 80 psi on tire is normally what they
say is the highest/safest pressure to seat the beads when installing tires.
I work at a Goodyear & I know people like to run higher for MPG. JMO
02-25-2014, 07:53 PM
#14
Senior Member
The standard F150 states 35psi for a P series (stock) tire. I run 40-42psi in mine.
the HD package has a higher pressure stated.
A LT tire will require a few psi more than a P series tire to carry the same weight.
There is no reason to run 80psi on an F150.
The max pressure rated on a tire is to carry the max capacity of that tire.
the HD package has a higher pressure stated.
A LT tire will require a few psi more than a P series tire to carry the same weight.
There is no reason to run 80psi on an F150.
The max pressure rated on a tire is to carry the max capacity of that tire.
02-25-2014, 08:01 PM
#15
Senior Member
The tires are rated for 3,195lb at 80psi. Total overkill. The wheels are rated for 2,400lb.
LT tires have load ranges. These are load range E. I have read that load range D tires would be sufficient but they are not common so Ford puts load range E tires on. There are Pmetric tires rated for >2400lb and I may try a pair of those when these wear out. Anyway you need to look at the door sticker but also at the tires. They may not be the original size/rating.
LT tires have load ranges. These are load range E. I have read that load range D tires would be sufficient but they are not common so Ford puts load range E tires on. There are Pmetric tires rated for >2400lb and I may try a pair of those when these wear out. Anyway you need to look at the door sticker but also at the tires. They may not be the original size/rating.
02-26-2014, 04:17 AM
#16
35 psi is the pressure needed for the maximum load of the tire, to drive up to 160km/99m/h and alighnment of wheels less then 2 degrees camber-angle ( like this on the imaginary axle/-\) . This goes for P-tires/standardload.
The 44 is the maximum pressure the tire-maker stands in for.
For higher speed first the 35psi , wich is also called the reference pressure Pr, has to be highened up with a system depending on speedcode of tire, and then multiplied with the camber-factor wich is calculated out of the camber angle.
P-tires /standard load always have Pr of 35 psi for american system.
XL/extraload/reinforced tires have Pr of 41 psi for american system.
On P-tires/ and XL// always P max is written on sidewall and not Pr.
From C-load/6PR ( Pr 50 psi USA) the Pr is written on sidewall , so you are allowed to go over that even ( TRA alows 10psi for LT ).
A stiffer tire ( C-load is stiffer then P-tire) needs a higher pressure for the same load, because the surface on the ground is smaller at the same deflection of the tire. Goal of all pressure calculations is to keep that deflection the same over the whole range of pressure/loadcapacity.
Dont use old American lists for that , wich you still can find on the internet, TRA swiched over for P-/ and XL// in 2006 to the calculation of European ETRTO , before that the calculation lead to to much deflection .
But here already written by someone that you need a bit more pressure for the same load , but dont need the Pr of that 80 psi mentioned.
The fillings will shutter out of your teeth then.
The 44 is the maximum pressure the tire-maker stands in for.
For higher speed first the 35psi , wich is also called the reference pressure Pr, has to be highened up with a system depending on speedcode of tire, and then multiplied with the camber-factor wich is calculated out of the camber angle.
P-tires /standard load always have Pr of 35 psi for american system.
XL/extraload/reinforced tires have Pr of 41 psi for american system.
On P-tires/ and XL// always P max is written on sidewall and not Pr.
From C-load/6PR ( Pr 50 psi USA) the Pr is written on sidewall , so you are allowed to go over that even ( TRA alows 10psi for LT ).
A stiffer tire ( C-load is stiffer then P-tire) needs a higher pressure for the same load, because the surface on the ground is smaller at the same deflection of the tire. Goal of all pressure calculations is to keep that deflection the same over the whole range of pressure/loadcapacity.
Dont use old American lists for that , wich you still can find on the internet, TRA swiched over for P-/ and XL// in 2006 to the calculation of European ETRTO , before that the calculation lead to to much deflection .
But here already written by someone that you need a bit more pressure for the same load , but dont need the Pr of that 80 psi mentioned.
The fillings will shutter out of your teeth then.
