Did my DPF cause me to lose two drive recaps?

Run tires at max cold psi. That is the exact pressure needed to support the load rating of the tire. If you are running constant 75 + mph speed limits add an extra 5 psi over cold psi stamped on sidewall.

Keep in mind truck tires are only speed rated for 74 mph max. That is why the premium manufacturers recommend max psi at a minimum and 5 psi over if running at the speed rating limit of the tire design.

A tire will get hotter to the point of turning the rubber into crumbs if run low on air. Low air causes the blow out’s with the heat build up of the sidewall stress. The tires are designed to take the higher psi that is normally built up with the normal heat if set at max cold psi. Not the heat caused by lower pressures.

A tire that is being run to low on air will have a distinct sour smell best described between burnt oily brakes and skunk. If you smell that during a walk around and you don’t think you passed any skunk roadkill it may just be a tire going bad.

 

It's a sliding scale tho, at 100 a tire will heat up way more than at 115. Friction and side wall flex creates heat. Higher pressures, less heat.

 

Read this ⬆️⬆️⬆️ also, check out the michelin site. If your running anywhere near max weights on your tires, they need to be max pressure COLD or your doing damage to them, and they will fail. Dont pay attention to hot pressures, it's the cold pressures that are important. The engineers know the pressures go up when they are heated, 120 cold is 130 or more hot, and that's not a problem. Technically if you run a tire underinflated any distance the damage is done and you should replace it. Before it blows.

 

but whats cold tho. 65 degrees 34 degrees, 10 degrees.

 

I usually base "cold" as room temperature (~70°). No idea if its right or wrong though.

 

68 degrees. And here's a chart to show temp/psi changes.

 

Yes. All of the above. Cold is in the morning, before its turned a wheel. I have to check mine co instantly. In the winter I may be -20 and 4 days later +70, and they will all need to be adjusted. It's better to be over Inflated Instead of under. So I'll run 118 in my steers, that's 110 when I'm home and 122 when im in Texas. Once again, cant say it enough, Better to be a little higher than low.
I did some racing in a past life, and we went to a seminar on tires put on by michelin. It was VERY informative. I've forgotten a lot of it, but the one thing the engineers said is, KEEP THE PRESSURES UP.

 

Cold definition is morning after sitting overnight or tires need to be ambiant air temp and not heated by direct sunlight. Direct sun could cause outside dual to be much hotter than inside. If you park for a few hours and the air temp is 80 and everything on the truck cooled down to match that temp than that is considered cold pressure.
Hot idling engine is always gonna keep steers at least to warm to check correctly.

 

Rule of thumb is Tires will naturally lose 2-4 psi for every 10 degree drop in temp. So if you have them set at 105 in the summer at 100 degree air temps during day. They can be at least 15-20 psi under inflated if the temp was to drop down into the 40’s overnight.

Michelins and Bridgestone’s tend to hold their psi better than the other brands. They have tighter bead wire tolerances which keep a better seal on rim of wheel and they also have thicker inner liner layers.

Aluminum wheels seem to drop pressures faster than steel also. We think its because they are more of heat sink and get much cooler to the touch therefore the psi will drop lower when outside temps drop drastically.

 

Just like an air system on the truck. IF THERE ARE NO LEAKS and you park the truck in 100 degree heat in the desert with 120 psi on the gauge and it drops to 40 degrees over night the tanks can lose 20 psi naturally in a few hrs.