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Old 04-23-2014, 10:56 AM   #21
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OK, there is no need to get all upset over any of this.

I will state that many of the TPMS sensors (including GM) do indeed collect/transmit temperature readings. We use the Bartec 400 SD tool in our shop, and it does display the temp readings.

If ya will hold off a little, I have an uninstalled TOYOTA new TPMS sensor in the box (the vehicle is not here), and will take a pic of this display from the tool.

EDIT: This is taken from the Bartec site, which explains what information the sensors collect/monitor.

What is a Tire Pressure Sensor?

Direct tire sensors which transmit real time tire pressure information to the driver of the vehicle either via either a dashboard display or a warning light. The sensors are physical pressure and temperature transducers which are attached to the back of the valve stem or are in a form which is banded to the wheel.

The sensors are manufactured by international companies such as Schrader, Siemens, TRW, Pacific, Lear, Beru and others. There is no common technical standard for the sensors and the OE's and suppliers have generated a multitude of sensor designs.

The sensors transmit data such as their unique sensor ID, pressure, temperature and battery status (where applicable) and other diagnostic information. This data is sent to the Engine Control Unit (ECU) or specific receiver on the vehicle. Those vehicles which have graphical displays of the sensor positions can then identify which wheel position has a problem.
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Old 04-23-2014, 11:20 AM   #22
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Alright, here is the printout of the new TPMS sensor, that is not installed in a vehicle......thus the air pressure of 0 psi.

As you can see, it does indeed have the temp reading of 73 degrees....which is what it also says on our AC/Heat thermostat in the office.
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Old 04-23-2014, 11:31 AM   #23
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The tool I used is the Techsmart T55001, which is made by ATEQ for us, in case anyone was wondering.
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Old 04-23-2014, 11:55 AM   #24
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Originally Posted by Airdale View Post
Excerpt from the Michelin Tire Service Manual.

“Generally, As a radial tire revolves during operation, heat is generated on the inside of the tire at 4 degrees per minute. However, the tire loses heat at the rate of 3 degrees per minute with dissipation throughout the casing and air flow around the tire. After 40 minutes of continuous operation, the temperature has increased 40 degrees Fahrenheit. As the temperature inside the tire increases, the inflation pressure also increases. Thus, a tire inflated to 80 psi cold would now be 85 psi. because the inflation pressure has increased, the amount of tire flexing has decreased, which decreases the amount of heat generated per minute to 3 degrees per minute. Assuming the heat dissipation factor is still 3 degrees Fahrenheit per minute, the net temperature change is nil (0). This is called thermal equilibrium.”

Airdale
With my TST TPMS system I have never noticed a 40° temperature increase and normally tow 2-4 hrs without stopping. Max has been about 20° over ambient when towing with the ambient between 70° and 90°.
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Old 04-24-2014, 07:59 AM   #25
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With my TST TPMS system I have never noticed a 40° temperature increase and normally tow 2-4 hrs without stopping. Max has been about 20° over ambient when towing with the ambient between 70° and 90°.
This has been my experience too. I'm normally about 10 degrees over ambient but I have lots of excess load capacity. This on all-day towing trips.
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Old 04-24-2014, 10:34 AM   #26
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Tires do have a great cooling system, consider this, the top half of the tire, because it's effectively moving forward, has up to 130mph of wind cooling it off!

The bottom of the tire, being hopefully locked to the ground, is going up to 65mph, but if you look at at a tire rotating, while the top of the tire is also going 65mph, it's going 65 in the opposite direction. Because you're moving forward, there's 65mph of wind going by, and the top of the tire is going 65mph against it, thus the differential is 130mph!
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Old 04-24-2014, 02:55 PM   #27
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Old 04-24-2014, 03:00 PM   #28
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Tires do have a great cooling system, consider this, the top half of the tire, because it's effectively moving forward, has up to 130mph of wind cooling it off!

The bottom of the tire, being hopefully locked to the ground, is going up to 65mph, but if you look at at a tire rotating, while the top of the tire is also going 65mph, it's going 65 in the opposite direction. Because you're moving forward, there's 65mph of wind going by, and the top of the tire is going 65mph against it, thus the differential is 130mph!
Big problem with that is the tops of the tires are enclosed and not subject to the wind over the top.
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Old 04-24-2014, 03:02 PM   #29
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X2 AcadianBob & OldCoot - we just took our rig on a all-interstate trip to South GA 2 weeks ago - ambient temps were in the mid 70s and i do not recall my TST TPMS 270 ever registering temps over 80 deg

Edit: I wonder how high temps would go if, for example, you were driving I-10 through AZ in July with ambient temps @110 deg?
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Old 04-24-2014, 05:41 PM   #30
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Edit: I wonder how high temps would go if, for example, you were driving I-10 through AZ in July with ambient temps @110 deg?
I've wondered about that too. Even Wyoming in July can be darn hot.
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