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Old 11-13-2018, 06:43 AM   #1
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Toad Tire Temperature

Have just completed my first long run with new TST tire monitoring. While in the north did not realize any tire temperature issues/differecne, although was not really looking for anything.

When we entered Florida engine went it Re-Gen and I thought I would watch toad tire temp as I had heard engine heat could effect passenger front. Sure enough passenger front toad tire raised about 10 degrees higher than driver side. After re-gen, temp came down but never matched other tire temperatures remaining 5 to 10 degrees hotter than driver toad temp. Interesting thing was despite the increase in temperature tire pressure was only 1 psi higher.

Has anyone seen this passenger tire temps running higher because of engine exhaust ?

Thanks, travel safe
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Old 11-13-2018, 07:12 AM   #2
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The TPMS sensor is not actually giving you the temperature of the tire. It is mostly affected by the air temperature outside, the sun or the exhaust gases. If the sensor was inside the tire, as all cars sensors are, then you would be seeing the tire temperature.
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Old 11-13-2018, 07:20 AM   #3
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Quote:
Originally Posted by Algoma View Post
The TPMS sensor is not actually giving you the temperature of the tire. It is mostly affected by the air temperature outside, the sun or the exhaust gases. If the sensor was inside the tire, as all cars sensors are, then you would be seeing the tire temperature.


I think this is some what true, but believe the temperature measurement is of the air inside the tire with some effect from the outside influences you list. As far as the OPs observation of a 10 degree increase, this is insignificant IMO
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Old 11-13-2018, 07:21 AM   #4
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Iíve been having the same issue with the front passenger tire running 10-15 degrees hotter. At first I thought it was a bad sensor, but after swapping two, the problem remained with the front passenger tire. It wasnít until a couple of days ago that I surmised that the high temperature was most likely due to the coach exhaust. I took the car for a ride at highway speeds yesterday with the coach TPMS and all tires had normal tire temperature. I was relieved as I had just replaced the tires due to abnormal wear and was thinking the problem was more than a front end alignment.

The tire pressure raised a few degrees due to the exhaust heat. Iím not sure thereís anything I can do about it.
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Old 11-13-2018, 07:44 AM   #5
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My front passenger toad tire consistently runs about 10 degrees warmer than the other 3 toad tires.
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Old 11-13-2018, 08:20 AM   #6
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Quote:
Originally Posted by lagawne View Post
Have just completed my first long run with new TST tire monitoring. While in the north did not realize any tire temperature issues/differecne, although was not really looking for anything.

When we entered Florida engine went it Re-Gen and I thought I would watch toad tire temp as I had heard engine heat could effect passenger front. Sure enough passenger front toad tire raised about 10 degrees higher than driver side. After re-gen, temp came down but never matched other tire temperatures remaining 5 to 10 degrees hotter than driver toad temp. Interesting thing was despite the increase in temperature tire pressure was only 1 psi higher.

Has anyone seen this passenger tire temps running higher because of engine exhaust ?

Thanks, travel safe
I don't think it is anything you should be concerned with. Possibly if out west in 100+ temps and those front toad tires start getting much higher temp reading you may want to keep your speed down some, but 5 -10 degree temp differences between tires shouldn't effect anything IMHO.
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Old 11-13-2018, 08:43 AM   #7
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Same +10 degree reading for us. Just drove Tx to Ariz.
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Old 11-13-2018, 09:02 AM   #8
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I have heard of this from many people so I turned my exhaust to the side a little in preparation for my TST. 5 minute job. Time will tell if it works.
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Old 11-13-2018, 09:04 AM   #9
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I've encountered the same issue before. It is due to the exhaust from the coach. On a previous coach, I rotated the exhaust tip so it was at a 45 degree angle toward the right side of the coach instead of pointing straight down. This resolved the issue. Unfortunately, due to changes in the emissions system setup on the new coaches, you can't rotate the exhaust tip. But I don't think it is a major problem as it is.
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Old 11-13-2018, 09:16 AM   #10
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On my current coach, the exhaust shoots out horizontally from the side. But on the previous coach, it was like most others, deflected to the ground at the rear passenger side.
The right front tire of my toad (right behind the exhaust side of the coach) was always 10 - 15 degrees hotter.


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Old 11-13-2018, 11:17 AM   #11
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Quote:
Originally Posted by Algoma View Post
The TPMS sensor is not actually giving you the temperature of the tire. It is mostly affected by the air temperature outside, the sun or the exhaust gases. If the sensor was inside the tire, as all cars sensors are, then you would be seeing the tire temperature.


Agree. The external sensor is reading the temperature of the air it is swirling around in, not the tiny amount of heat that may propagate by conduction up the stem.
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Old 11-13-2018, 11:53 AM   #12
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My RF toad tire (directly behind exhaust) always runs 10-15 hotter as measured by EEztire. During Regen this summer in TX I saw it go up another 10 or so degrees.
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Old 11-13-2018, 09:04 PM   #13
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Quote:
Originally Posted by Ken Gluckman View Post
I've encountered the same issue before. It is due to the exhaust from the coach. On a previous coach, I rotated the exhaust tip so it was at a 45 degree angle toward the right side of the coach instead of pointing straight down. This resolved the issue. Unfortunately, due to changes in the emissions system setup on the new coaches, you can't rotate the exhaust tip. But I don't think it is a major problem as it is.
Mine has a clamp with 2 bolts that holds the chrome tip.
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Old 11-13-2018, 11:26 PM   #14
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My Wrangler ps front was running a full 20 degrees hotter. I rotated the exhaust tip out about 45 degrees and this lowered the temp reading about 5 degrees. On a long uphill pull I still get a temp raise of up to 20 degrees on the right front.
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