Tire Temperature Readings July 30, 2018, 03:42:28 pm A followup on an old thread about tire location and temp reading.I was not happy with my old TPMS - Tire Minder. I brought a new system to test. Tire Safe GuardInstallation was quick and easy. But as they say only a real world test is the final judgment. After about six days on the road in an assortment of driving conditions I'm as happy as one could be with a mechanical object. This last sunday I left camp around 10:00. We were at around 2000 ft elevation, outside temp in the low 70.At start of drivefront left tire temp tire pressure front right tire temp tire pressure 70 70 65 73rear left duels rear right duels75 75 70 76 63 76 64 77after 200 miles driving to sea level outside temps in 90plus measurement taken at full stop in Costco gas stationfront left tire temp tire pressure front right tire temp tire pressure 116 83 113 85rear left duels rear right duels107 85 114 87 123 87 118 86Very unscientific observationsI'm sure the change in elevation is/was canceled out by the very large change in outside temperatures. My educated guess would be that the tire pressure change is mostly if not all do to the tire temperatures running mostly at 55 on I-5 freeway. The most interesting thing to me is both inner duels run hotter. <smile> Since I'm one of those that rotate all tires I guess I proved to me at least it worth the effort. As an Amazon Associate Lazy Daze Owners' Group earns from qualifying purchases.
Re: Tire Temperature Readings Reply #1 – July 30, 2018, 05:21:24 pm With external TPMS sensors, temperature readings are highly dependent on ambient temperatures, and have little to do with tire temperature. I wish there were a way to disable those readings, as they just make the readout more confusing at a quick glance...Steve
Re: Tire Temperature Readings Reply #2 – July 30, 2018, 07:28:08 pm I have found with my TST Tire Systems TPMS, the tires run hotter on the sunny side of the rig.After retiring, the rat race becomes a spectator sport.Joel
Re: Tire Temperature Readings Reply #3 – July 30, 2018, 08:19:57 pm While some pressure monitors may be better than others, any TPMS is better than none at all. “After retiring, the rat race becomes a spectator sport”. I can’t wait to get a ring side seat and enjoy the show. 😎Kent
Re: Tire Temperature Readings Reply #4 – July 30, 2018, 08:39:16 pm Hi Colddog. I agree with Joel about the temperatures at rest. Before your trip, I would say the sun was on the passenger side. I have an auto with real time pressure readouts (no Temps). The pressures equalized early in the morning, go up on the side in the sun, depending where it is parked. The highest temperature reading, maybe not the actual tire temperature per Steve, does agree with Larry's observation that the dual closest to the exhaust pipe does run hottest. I think his heat shield was a good idea. I don't rotate my tires, but at 11,500 lbs. max, (E350) I have the same load rated tires as the E450 chassis. RonB
Re: Tire Temperature Readings Reply #5 – July 30, 2018, 09:00:38 pm Use an infrared thermometer to confirm the TPMS sensors.Amazon.com: Etekcity Lasergrip 1080 Non-contact Digital Laser Infrared...It's useful for many things.As Steve pointed out, the sensors are located on the outside of the tires and are effected by the sun and local air temperature .Pressure alone is a good indication of temperature, Boyle's law is in effect.When a tire's pressure zooms way past its normal operating range, that's a good indication the tire is getting hot.There is no other mechanism that would raise the tire's pressure, while driving (with the exception of through-the-hub airing systems).If the sensors are the OEM-type, installed inside the rim, that's a different story .Larry As an Amazon Associate Lazy Daze Owners' Group earns from qualifying purchases.
Re: Tire Temperature Readings Reply #6 – July 31, 2018, 12:51:40 am Although an infrared thermometer is better than nothing a tire pyrometer is optimum for reading tire temperature. The main difference being that an infrared thermometer is only reading surface temperature which changes very quickly and their measurement is based upon the materials reflectivity. If you are unable to calibrate your IR thermometer for the surfaces reflectivity your readings are already wrong. Plus, with all the time it takes to record your measurement the surface temperature changes too quickly. Now a pyrometer is reading the core temperature of a tire which has been conveniently insulated by the rubber surrounding it Also, when reading a tire make sure you are taking and recording three temperature measurement across the tread pattern on each tire. Recording the inside, then the center, and finally the outside of the tread on each tire can tell much about exactly how the tire is interacting with the road surface. You can find pyrometers for a few hundred dollars and they are sure fun to have around.Now the absolute worst conditions any tire can be exposed to are high temperatures, heavy loads, and high speeds for extended periods. Remember the Ford and Firestone debacle where blowing tires on the road and people were being killed? While working on my MS I performed quite a bit of research in that area and all I can say is anyone who drives on underinflated tires in those conditions is certifiably nuts. I was racing the nationals also so tires and handling were a life and death consideration for me. Tire pressure is critical especially for RVs.Also, the Ideal Gas Law is an even better choice since it incorporates Boyles Law, Charles Law and a few others I can't even begin to remember. I do remember PV=nRT though
Re: Tire Temperature Readings Reply #7 – August 03, 2018, 12:38:43 am I used to measure tire temperatures when I was racing, so I could adjust the pressures and suspension to the course. I have used an infrared thermometer to measure the tire treads on my motorhome, but then what? The suspension is already set to chassis specs - not doing to change that, and the tire pressure is determined by weight - not going change the pressure. So, I never measured the tire temperature again. 1 Likes
Topic: Tire Temperature Readings (Read 249 times)
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Topic: Tire Temperature Readings (Read 249 times)
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