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Old 09-25-2015, 03:39 PM   #41
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I know it has been a month, but had a death in the family and that has been our focus for a few weeks. I had everything installed and picked up the Sunseeker with valve extenders and the TM-507RV/SG set up by the tire shop. Everything looks good and seems to be operating well. (I have only driven it about 15 miles, home from the tire shop.)

My question is, how much of a psi range do you give on the monitor? High and/or low pressure, other settings and suggestions, etc.

Thanks!

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Old 09-25-2015, 06:57 PM   #42
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TPMS settings

You didn't provide info on your target CIP but so I can only tell you how I have my settings.
First off I recommend that TT with multi axles run a CIP equal to the tire inflation on the side of the tire associated with the max load. This may match the tire placard but you need to read your placard to confirm the numbers.

Lets assume your CIP is 80 psi (Load Range E tires). One time you need to check your inflation with a good digital gauge and confirm the hand gauge reads 80. Note the tires should be cool and not driven on for at least two hours and not in direct sunlight to get an accurate reading.

Having confirmed the tires are at 80 you can then check your monitor on what the TPM is reading. I would not be surprised to see pressure variations of +/- 2 to 3 psi. Remember TPMS are primarily designed to warn of a loss of pressure not to be pressure gauges.

Most TPMS are set to warn when pressure has dropped 15% from the CIP. I prefer to get a warning before tires get that low so I set my "base level" at about 107% of the 80 psi.

Now my TPMS gives a Early warning when the pressure drops 3 pis from the HOT operating pressure in about 2 minutes.

You can expect to see your HOT pressure to be 10 to 20 psi above your CIP but this depends on your actual load and driving speed.

You can also expect your operating temperature to be +10 to + 30 above ambient. Since the sensor is external to the tire it is cooled by the outside air so will never read that actual internal tire temperature so IMO if you see +30 you need to slow down and maybe even park for a 1/2 hour or so to let the tires cool off. While there are many variables I would not be surprised to see external TPMS temperature readings to be 10 to 30 cooler that internal tire temperatures so i would consider +30 reading to be high.

After you drive for a few weeks with your TPMS you will learn the variation in the readings and should not be concerned about minor variations in the reading.
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Old 09-25-2015, 08:45 PM   #43
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Thanks Tireman9.

My CIP is 80 and E rated Michelins. I drove it around some tonight and the right front tire was reading 85 psi and the alarm on the monitor started beeping. I'll try to adjust it tomorrow to your suggestions.

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Old 09-25-2015, 10:51 PM   #44
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Quote:
Originally Posted by 757Dave View Post
Thanks Tireman9.

My CIP is 80 and E rated Michelins. I drove it around some tonight and the right front tire was reading 85 psi and the alarm on the monitor started beeping. I'll try to adjust it tomorrow to your suggestions.
Sounds like the TPM settings are set too low so you might be getting a high pressure warning. Suggest you review the instructions for your TPMS.
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Old 09-27-2015, 01:37 AM   #45
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This is a great thread. The importance of proper tire inflation can't be understated, I especially appreciated the pictures of your mods. I'll be copying the setup!
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