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Old 02-16-2019, 12:08 PM   #31
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Quote:
Originally Posted by SilhouettePenny View Post
Probably not...nobody installs TPMS on a truck that already has it, and likewise for the over-pressure question. We install it as a low pressure warning system.

Actually some people do. They do it because aftermarket systems like the TST 507 give not just a low pressure warning but also show actual pressure(s). Unless your OE TPMS shows pressure readings one can merely screw on the TST type sensors and have the pressure readings show on the same screen as trailer pressures.

As for JUST a low pressure warning, that's all the OE systems are for the most part. Some also want over-heat and over pressure warnings as well.

Only downside to adding the sensors to a truck with an OE installed TPMS is that the sensors are expensive. Then again, so are tires.
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Old 02-16-2019, 12:28 PM   #32
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Originally Posted by Chuck_S View Post
Nitrogen filled tires are a scam. Air is 78% nitrogen to start with and is free. There are scientific experiments that "prove" the benefits of nitrogen in trailer tires but the benefits are insignificant and need scientific instruments to measure them. Just use "N78 air" and you'll be fine.


If you merely fill your tires with compressed air, due to the permeability of the tire inner liner (all tires loose air when the gas molecules work their way between the molecules of the inner liner) eventually the actual concentration of nitrogen rises. Oxygen, Helium, Argon, and all the other gases present in "Air" are expelled under pressure just like in a reverse osmosis filter. As you continue to add air periodically as pressure drops, eventually you'll notice that you have to do so less and less frequently. This of course excludes variations in pressure due to ambient temperature variations and NO, Nitrogen is not immune from pressure/temp variations. In doubt refer to the Ideal Gas Law
https://en.wikipedia.org/wiki/Ideal_gas_law

FWIW this is exactly how Nitrogen is obtained for use in Tire Shops and Car Dealerships. Membrane type Nitrogen Generators. Maybe a few have liquid nitrogen delivered but it's a lot more dangerous to handle and expensive.
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