TPMS reads high on one tire with my 2013 1500

Discussion in 'General Chevy & GM Tech Questions' started by WorthFlorida, Jan 20, 2014.

  1. Dana W

    Dana W Member 2 Years 100 Posts

    That only applies to pressure measured while hot as compared to tires with air for the same ambient temperature and milage. Nitrogen runs cooler. That's all.
     
  2. Jamm3r

    Jamm3r Member 2 Years 100 Posts

    Heh... air without nitrogen... seems to me I have a tank of that for my cutting torch, says Oxygen on it...

    http://en.wikipedia.org/wiki/Atmosphere_of_Earth#Composition


    The TPMS sensors do not transmit often, and sometimes the transmissions aren't received by the BCM. It is likely that the high reading you got was stale.
     
  3. RayVoy

    RayVoy Well-Known Member 2 Years 1000 Posts

    Ok, so your saying, start with 34 psi of air in the left front tire and put 34 psi of nitrogen in the right front tire, drive for 50 miles and take tire pressure readings. Your saying, the tire with nitrogen will read lower than the tire with "air".

    Ok, I'll accept that, the tire with nitrogen might read a little lower than the tire with air. But, it won't be by much, air is 78% nitrogen.
     
  4. the phantom

    the phantom Active Member 2 Years ROTM Winner Gold Member 1000 Posts


    100% Nitrogen will not change pressure in any temperature.
    Yeah its kinda like whats heavier, a pound of gold or a pound of feathers...:lol::rules:
     
  5. McClintoc

    McClintoc ɹoʇɐɹǝpoɯ Staff Member 2 Years 1000 Posts Platinum Contributor

    Incorrect. Nitrogen, being a natural element in our physical universe, it subject to all the same laws of physics as all the other elements. If you increase its temperature in a closed volume, it will expand and thus, increase the pressure in said closed volume.
     
  6. WorthFlorida

    WorthFlorida Member 2 Years 100 Posts

    McClintoc is correct. Let end these claims about Nitrogen but change it to what Nitrogen does for you.

    I just replaced the tires on my wife's Murano. They were filled with Nitrogen from day one and at 48K miles I replaced the tires with the same OEM brand, Bridgestone Dueler H/T 687, that have a UTQG of only 300. Unreal, they should have lasted 30K. For three years I never had to add air, tires were rotated maybe two times and pressures were checked at each oil change. I credit the longevity to Nitrogen and some to allot of I-95 driving. The tires just do not loose pressure as our breathable air. When I bough my new 2012 Silverado, the service advisor was not even sure if the nitro machine worked anymore and the tire dealer did even offer it. It seems that the Nitrogen fill (extra profit) is just not being offered much anymore.
     
  7. the phantom

    the phantom Active Member 2 Years ROTM Winner Gold Member 1000 Posts

    I guess what I was trying to say is that the pressure increase using Nitrogen is less than regular air with increase in temperature. I agree that the elements are subject to the same laws but they all do not give the same result. If that was true then all elements would freeze at 32 degrees like water or all things would boil at 212degrees. Everything has its own rate at which it expands contracts ect. This is why I suggested that the pressure does not change with temperature increase that our tires will see. I think @RayVoy example is perfect in explaining this. I would bet if you used his example you would see more of change in the regular air tire on a digital tire gauge compared to the Nitrogen tire. Probably not enough though to change ride characteristics ect. Nitrogen is cheap so thats why tire shops can "sell" you on the theorys behind it. Is it really worth it? Probably not unless you can get it for nothing IMO.

    I use nitrogen at work to purge gas through gas lines.. Its used because the molecules are larger than air and when introduced into a gas line it becomes a Heavy slug to move the lighter air out of an open end of pipe. The natural gas is then put behind the "slug" of nitrogen keeping the air and gas seperate.

    We also use it for testing new pipelines.. The new gas mains that I work on are tested at a minimum of 90lbs. for an hour. When I use air compressor air the pressure actually drops about a pound or two over the course of an hour after its change in temperature from being in the ground.. When we test with Nitrogen it doesnt change at all over the course of an hour. I have to document any change in pressure and the utility does not allow any drop in pressure when using nitrogen because of this characteristic. But we generally use an air compressor because of its conveneince and its generally done for an integrity test of the pipeline and not used to find real tiny leaks.
     
    Last edited: Feb 15, 2014
  8. Dana W

    Dana W Member 2 Years 100 Posts

    I am not sayin' it, science says it. Molecular Nitrogen is less dense than oxygen, or even natural air, and can't hold as much heat energy. An inflated nitrogen tire even weighs less, of course it ain't much, but this trick comes from racers, and those guys will pay hundreds of thousands of dollars for a hand full of horsepower.

    For us street jockeys, it's just a thing we can say we do while havin' a beer with the guys.

    - - - Updated - - -

    Wrong, all gasses change pressure at ALL temperatures.

    - - - Updated - - -

    That is right. The less mass a gas has, the less it will expand when heated. It sounds like you said it backwards before.
     
  9. WorthFlorida

    WorthFlorida Member 2 Years 100 Posts

     
  10. RayVoy

    RayVoy Well-Known Member 2 Years 1000 Posts

    Let's get real guys, air has an average molecular weight of 29, nitrogen has a molecular weight of 28.02. Do you know why they are so close?

    THE AIR WE BREATH IS 78% NITROGEN.

    You fill a tire with air which is 78% nitrogen, or you fill a tire with 100% nitrogen. Do you really think that you, or your tire, can tell the difference.

    I agree, racers use nitrogen, also, did you know that airline companies use nitrogen in the tires on their planes.

    And why?????????? There is no oxygen. Nitrogen will not burn. The 21% oxygen that is in "air" will burn and it will fuel a fire. Something you do not want on a plane, or a race car.
     

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