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Old 03-26-2014, 07:59 PM   #21
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Originally Posted by f1100turbo View Post
Pressure values can only be done via a tuner or the dealer.
For a fee of course.

We JUST had our 2007 1500 gmc done at the dealer when we went from p rated tire to a LT.



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You can also do this with snapon's solus ultra, and modus.
These are $5-10k scanners and update twice a year at about $6-900 an update. Thats why fees are what they are.
Just threw this out as you might find a shop or somebody that has one of these and can do it instead of running to a dealer.

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Old 03-26-2014, 09:37 PM   #22
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I run mine at 45psi empty, and 75psi loaded, if you keep your tires inflated much over 60psi unloaded you will wear out the center of the tire in no time, just because they can handle 80psi that is at max load, usually around 3,000lbs. per tire, heck, the rear axle unloaded might weigh 3,000lbs. total, your tires will like you more, and your wife will like you more if your air them down when empty.
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Old 03-26-2014, 10:03 PM   #23
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I have aired up to 70lbs with no TPMS warning on my 1500. So i am not sure about the 10lbs over and under.
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Old 03-26-2014, 10:11 PM   #24
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I have aired up to 70lbs with no TPMS warning on my 1500. So i am not sure about the 10lbs over and under.
It will vary by make, model and year sometimes. Your towmax package may have something to do with it. (We don't see very many of these)
I've had some vehicles that would alert you, but I try not to overfill tires as most are p rated. And of course it will vary as to what pressure range is set in the bcm or tpms.

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Old 03-26-2014, 10:26 PM   #25
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I just found this


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Old 03-27-2014, 01:24 AM   #26
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and remember that the max tire pressure is a COLD pressure......have you ever seen how much pressure a tire gains after running a few hours in sum good ol texas 100 degree weather?....even if the tpms has a high pressure limit, it would have to be pretty high to compensate for normal pressure gain due to temps....

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Old 03-27-2014, 05:43 AM   #27
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Only by driving the pressure rises about 10% but by braking a lot or other external conditions like hot sun on it, the temperature inside the tire can rise even up to boiling point of water ( 100dgr C/200dgr F?) and with that the pressure rises.
Valves are given a maximum cold pressure , and are tested to stand the pressure rising up to that high temperature.
Also the tires are given cold pressures and that is not even the maximum pressure of tire. Maximum for LT tires is 1,4 times the maxloadpressure given on LT ( E-load 80 psi) and then even pressure rising for higher temperature, so I think the absolute maximum pressure of a tire is even 1,5 to 2 times that 80 psi.

Once made a spreadsheet to play with the temperatures and pressures , here the link to the map on my one-drive with also motorhome calculator.
https://onedrive.live.com/?cid=a526e...E092E6DC%21793

and a picture of a filled in one, in wich I manipulated the spreadsheet to give the answers I wanted, so text in it is not what it stands for.

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Old 03-27-2014, 06:29 AM   #28
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Just put a new set of Firestone Transforce ATs on this week. My 4th set of these and I run 55-60 when single and up them to 70-75 while towing. No tire wear problems before at these pressures and the truck just turned over 200k miles.
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Old 03-27-2014, 08:10 AM   #29
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For example.
36 degrees this am.
Front tires 60 psi.
Drove 25 miles at 55 and 15 miles at 65.
Front tires 64 psi.

4 psi raise with ambient temp at 36 degrees.

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Old 03-27-2014, 08:55 AM   #30
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Originally Posted by jadatis View Post
Only by driving the pressure rises about 10% but by braking a lot or other external conditions like hot sun on it, the temperature inside the tire can rise even up to boiling point of water ( 100dgr C/200dgr F?) and with that the pressure rises...
I believe TST TPMS comes with the max temp of 157D for the alarm to activate. According to them and Michelin, tires start failing between 180-200D.
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