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Old 08-08-2014, 08:57 PM   #1
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Tst tpms

I've had this system on my trailer for almost three months and had no issues. Just checked tire pressure with a good gauge and have 63psi in all four by the gauge. The TPMSIve reads 68psi in all four. I did not reset parameters, tires cold, no sun. Should I just take note of the difference and drive on or is something up? Next leg is 190 miles.
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Old 08-08-2014, 08:58 PM   #2
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Did you have to install metal valve stems with this system?
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Old 08-08-2014, 09:02 PM   #3
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I did not
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Old 08-08-2014, 09:22 PM   #4
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I have the TST 507 external sensors on my trailer, and I find the pressure reading varies a few pounds. It seems random (different tires are higher/lower on different days). They do seem pretty good about showing pressure increases as the tires heat up, so I don't worry about the variation.

However, I don't think I have ever had the readings be off by as much as five pounds.
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Old 08-08-2014, 10:21 PM   #5
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Went back to recheck the reading of the TPMS and found that the temperature reading is five degrees lower then the temperature reading on three other readings, mine, my neighbors, and my cars OAT gauge. Today's temp has pretty much reminded the same, with no sun and fairly cool. So now I have higher pressure reading and lower temperature reading on the TPMS. Any thoughts?
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Old 08-08-2014, 10:35 PM   #6
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I have had some variations. I moved sensors and carefully tracked the tires move to... 2-3 psi variation max. Between all 6 sensors the variance is usually a spread of 3 psi.

They do not match the electronic tire gauge. Rather, they read a little higher.

What they do is give you feedback. They are "close" enough. They warn of issue quickly... And they help monitor real ops.

Happy to have them!
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Old 08-09-2014, 07:22 AM   #7
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Quote:
Originally Posted by SilverEagle6 View Post
I've had this system on my trailer for almost three months and had no issues. Just checked tire pressure with a good gauge and have 63psi in all four by the gauge. The TPMSIve reads 68psi in all four. I did not reset parameters, tires cold, no sun. Should I just take note of the difference and drive on or is something up? Next leg is 190 miles.
Internal or external?

There's a lot of variance between gauges. The only thing is worry about is where you've set the alarm parameters. If you're loading at 65 cold, you might set the high pressure alarm for 80 (about 15% above cold). If the sensors think you're starting at 68, you're likely going to get to at least 75 (10% rise in normal use) so not much headroom before hitting the alarm.

Pretty minor thing to worry about :-)
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