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WANative
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Joined: 09 May 2016
Posts: 277 | TRs | Pics
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WANative
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 Wed Sep 28, 2016 8:43 pm |
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| LizzyRN wrote: | | My 2006 Expedition often lights up a Low Tire warning when it's around 32F and I first start it up. Goes off when it warms up. |
Yup.
If you're not airing up every 30 days, when winter starts to set in this will happen until the light just stays on all the time and you gotta air up to get it to go off.
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LizzyRN
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Joined: 16 Aug 2013
Posts: 204 | TRs | Pics
Location: Mount Vernon |
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LizzyRN
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Thu Sep 29, 2016 7:09 am |
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Thanks!
LizzyRN
Where's my inhaler?!
LizzyRN
Where's my inhaler?!
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christensent
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Joined: 05 Nov 2011
Posts: 658 | TRs | Pics
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| BigSteve wrote: | | Nah. Direct TPM (dTPM), which uses sensors in the wheels, is in most cars on the road with TPM. Indirect TPM (iTPM), which relies on ABS or TC wheel speed sensors, is making a comeback and will eventually become the more common system. |
Is indirect TPM legal for sales? I was under the impression that all new cars sold must have sensors on the inside of the tire/rim.
Learning mountaineering: 10% technical knowledge, 90% learning how to eat
Learning mountaineering: 10% technical knowledge, 90% learning how to eat
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InFlight
coated in DEET
Joined: 20 May 2015
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Location: Seattle area |
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InFlight
coated in DEET
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Thu Sep 29, 2016 7:55 am |
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I would bet that almost 99% of new cars have direct TPMS systems.
If you remember the ideal gas law from high school chemistry or physics; the pressure in the tire is directly proportional to the absolute temperature of the tire. So the tire pressure is always lowest when the tires are cold.
The point of nitrogen in the in the tires, is that is it a DRY gas that doesn't contain water or any Ozone. The lack of water and ozone greatly reduces any corrosion of the rims or TPMS sensors. Since your typically changing tires every ~40 to 50K, any internal oxidation on the rubber is not much of a concern.
“I went to the woods because I wished to live deliberately...” ― Henry David Thoreau
“I went to the woods because I wished to live deliberately...” ― Henry David Thoreau
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DIYSteve
seeking hygge
Joined: 06 Mar 2007
Posts: 12655 | TRs | Pics
Location: here now |
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DIYSteve
seeking hygge
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Thu Sep 29, 2016 8:33 am |
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| christensent wrote: | | I was under the impression that all new cars sold must have sensors on the inside of the tire/rim. |
Nope. Many new cars are now equipped with iTPMS. See below
| InFlight wrote: | | I would bet that almost 99% of new cars have direct TPMS systems. |
I'll take that bet. See http://www.tirereview.com/indirect-tpms-imports/ Audi, BMW, Mazda, Lexus, Mini, Toyota, VW and others are moving to iTPMS because technology has improved and it's less expensive. It's also way less hassle when switching to and from snow tires.
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