what psi should i run?
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what psi should i run?
i have a 06 250 4x4 with the 5.4 lifted 6 inches with 37/13.5r17 toyo mt tires. i dont know what psi to run i was thinking about a higher psi for maybe better gas mileage right now im running 35 can i go higher??
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From: Frederick, MD
Steve_250 is right. more pressure= firmer ride better mileage and use the higher pressure for heavy loads.
More pressure does reduce the rolling resistence but too much pressure unloaded and you will not even tire wear.
More pressure does reduce the rolling resistence but too much pressure unloaded and you will not even tire wear.
Postmaster
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A good tire shop would normally use load/inflation tables to reference the OE size and pressure vs the new size. If you can provide your OE size and pressure requirements from the VC label (door sticker) I can help you figure it out. My guess is your new tires should be right about 40 psi...
Cargo Master
Joined: Dec 2007
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From: Carstairs Alberta
take a chalk stick and make a band across the full treadwidth. drive ahead3-4 tire revolutions check to to see how evenly the chalk is erasing.if it wears off in the middle first press is too high. if on the sides first you need more press.you shoulf not exceed the # on the sidewall or go down to less than 3/4 of the number.as soon as you depart from factory brand tires the chart on the door is fairly meaningless. the number on the sidewall is the max safe press for the carcass, which is also the pressure to use for max payload, if you're not spending most of your time at 75% load or more , max is too much press
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From: Peoria, IL
take a chalk stick and make a band across the full treadwidth. drive ahead3-4 tire revolutions check to to see how evenly the chalk is erasing.if it wears off in the middle first press is too high. if on the sides first you need more press.you shoulf not exceed the # on the sidewall or go down to less than 3/4 of the number.as soon as you depart from factory brand tires the chart on the door is fairly meaningless. the number on the sidewall is the max safe press for the carcass, which is also the pressure to use for max payload, if you're not spending most of your time at 75% load or more , max is too much press
The best way to figure out tire pressures is to find out your actual front and rear axle weights and use the tire inflation tables to get the correct pressures. The numbers Ford lists on the door jamb use the tire inflation tables and the maximum front and rear weight ratings, so unless you run around at max GVW all the time Ford's numbers are too high.
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