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Tire Pressures?

I have a favour to ask of someone with sometime and a compressor. If you could lower the pressures and figure out the trigger points please. I would but it’s freezing here. If I new the magic numbers I could do a guestimment calculation for -40... I think the loss is about 10 or so psi from 0 Celsius to -30 or -40. Thx in advance.
 
I’ve only tripped the rear. But my truck calls for 65psi front/rear. I would think they’d be the same.


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I have tried mine at various pressures, I drive mostly unloaded and settled with them at 60psi all round at cold (SoCal cold is may 50F, so not cold as some of you)
This give a great comfortable ride, better than my Golf GTi and my last Ram 1500.
I do however notice big difference when hot, 69psi front and 67psi rear when on longer runs 70mph, still rides good
 
I have a 2019 3500 Cummins SRW. LT275/70R18. According to the Firestone table (08/07/2018) unloaded I run 50 front, 45 rear when I am not loaded. The truck sticker seems to say it weighs about 8K pound with passengers but not loaded with payload or towing. So those pressures will give me 2700 lbs per tire in front (50 PSI), 2500 lbs per tire in rear (45 PSI), about 10,500 lbs total. No warnings or red lights.
I can definitely understand not wanting to fill and reduce pressure. When we start towing the fifth wheel, parking the fifth wheel for three weeks or so at a time, I will probably fill and reduce pressure. If I was towing regularly (every couple days), I would probably leave the tires at the towing pressure. Below is the link to the tables I am using
 
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DevilDodge said:
On my 15 the light comes on at 65 for the rear, then you must inflate to 80 to get it off.
I usually let mine at 70 so on the colder mornings they don't fall below 65 and on the heat of a trip only rise to about 75.

Do the 2019/20 let you go below 65 rear without the light?
Click to expand...
Have 2019 3500 SRW run rears at 50, fronts at 65 cold, don't see any lites or bells-chimes. Empty of course
 
Great White North Eh said:
I have a favour to ask of someone with sometime and a compressor. If you could lower the pressures and figure out the trigger points please. I would but it’s freezing here. If I new the magic numbers I could do a guestimment calculation for -40... I think the loss is about 10 or so psi from 0 Celsius to -30 or -40. Thx in advance.
Click to expand...
My warning comes on at 415 kpa front and 515 kpa rear.
 
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Yes sir! I have to get out and pee every hour or so anyhow so I feel all of my tires. If they ain't hot, they are good!
 
Ran tires at 50 for a 200 mile road trip yesterday. Truck rode smooth but tire light is on this morning and saying inflate rear to 65


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Hstone556 said:
Mine were 80 when I picked the truck up,
Click to expand...

Mine came off of the truck...and the dealer delivered it....with all 4 tires from 87 to 90. I dropped them to 70 front/75 rear and will probably drop all of them another 5 lbs.
 
I can't get TFA to work, i.e., hazard warning lights and the horn signaling it's in TFA. I followed the video instructions to include selecting TFA in Uconnect. Anyone else have this issue? Like some of you above, my tires were way overinflated from the dealership but when I take air out of the tires and/or try to put air in I don't get any audible indicator when I'm in TFA. I must be missing something.
 
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lovegolf44 said:
I can't get TFA to work, i.e., hazard warning lights and the horn signaling it's in TFA. I followed the video instructions to include selecting TFA in Uconnect. Anyone else have this issue? Like some of you above, my tires were way overinflated from the dealership but when I take air out of the tires and/or try to put air in I don't get any audible indicator when I'm in TFA. I must be missing something.
Click to expand...

I’ve used it. It’s tricky - you have to have the truck “ON” or running, got to SETTINGS and enable it there in the safety section, THEN go to the tire pressure alert app and set it up. Works as advertised, but I won’t use it anymore. Here’s why:

Door jams recommends 60/60 for pressures. E-rated tires can go to 80. Pressure fill assist WILL NOT go above 60. WTF. So I get a honk at 60, but as I go higher (I like 70F/75R when full-load towing) it will double honk at me a bunch. Annoying.

The kicker: the TPMS warning doesn’t like tires below 45, but the pressure fill alert will let me save a preset with pressures BELOW that. But not pressures above 60. Just kinda messed up.

Easy fix @RamCares via software flash (more selectable pressures)... but the actual system works exactly as advertised.
 
dragon_ram said:
I’ve used it. It’s tricky - you have to have the truck “ON” or running, got to SETTINGS and enable it there in the safety section, THEN go to the tire pressure alert app and set it up. Works as advertised, but I won’t use it anymore. Here’s why:

Door jams recommends 60/60 for pressures. E-rated tires can go to 80. Pressure fill assist WILL NOT go above 60. WTF. So I get a honk at 60, but as I go higher (I like 70F/75R when full-load towing) it will double honk at me a bunch. Annoying.

The kicker: the TPMS warning doesn’t like tires below 45, but the pressure fill alert will let me save a preset with pressures BELOW that. But not pressures above 60. Just kinda messed up.

Easy fix @RamCares via software flash (more selectable pressures)... but the actual system works exactly as advertised.
Click to expand...
That's depressing. So much for TFA. Thx for the warning.
 
Had to do a search to find this post. I knew someone had to ask the tire pressure question. Like others posted, door sticker says 60 PSI, tire says 80 PSI, dealer had them at 85 PSI. Im going to see what 60 PSI feels like for unloaded. I can always air them up when I check my RV tires before I leave for a weekend of camping.
 
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