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Old 06-25-2009, 10:55 PM   #1
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TST - Acceptable PSI variance on duals.

I realize that all four need to be inflated to the same PSI and temp can affect that number but for those with the TST system, is there an acceptable PSI variance before you get worried and remove the sensors to verify the PSI?

For example, by air gauge, my 4 rears are 95 PSI cold. Daily cold readings vary by a pound or two between the 4. Sometimes one or more may be above or below the 95. The numbers seem to change daily. Monitoring the hot as I'm driving, a tire on one side may be as much as 5 pounds different than one on the other and one or two pounds different than the one next to it. When they cool off they are back to being close to the 95.

Love not having to physically check each tire daily but at what point do you pull the sensors and check with a gauge?
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Old 06-25-2009, 11:38 PM   #2
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I would pull the sensor to check with a gauge if:
1 - pressure drops on one tire to the point it triggers the low psi alarm
2 - pressure does not return to the "normal" reading after sitting overnight
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Old 06-25-2009, 11:59 PM   #3
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Thanks Chaplain. The advantage of having all that instant everchanging info at my fingertips was about to drive me crazy.

btw- Nice website. DW and I enjoyed my (our) 8 years in the Army. Afterall that's where we met HIM!
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Old 06-26-2009, 04:04 AM   #4
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Quote:
Originally Posted by Nonno View Post
I realize that all four need to be inflated to the same PSI and temp can affect that number but for those with the TST system, is there an acceptable PSI variance before you get worried and remove the sensors to verify the PSI?

For example, by air gauge, my 4 rears are 95 PSI cold. Daily cold readings vary by a pound or two between the 4. Sometimes one or more may be above or below the 95. The numbers seem to change daily. Monitoring the hot as I'm driving, a tire on one side may be as much as 5 pounds different than one on the other and one or two pounds different than the one next to it. When they cool off they are back to being close to the 95.

Love not having to physically check each tire daily but at what point do you pull the sensors and check with a gauge?
Per info on michelin's and bridgestones websites a 30 degree temperature difference in inner and outer dual tires measured at the bead is normal. you can expect tire temperatures measured at the bead to be about 60 degrees hotter than ambient air temperature. bridgestone states that 200 degrees measured at the bead is too hot and can damage the tire.
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Old 06-26-2009, 05:53 AM   #5
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Dan,

Gee, who would have expected an answer about tires would have been found on the tire manufacturers website.

Thank you. That answers this question and the other I asked about high temp.
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