I've been trying to do a little reading up on this, because both my 2015 Jeep and my 2018 Toyota have them. From what I can gather there are 2 types. Direct, and Indirect. Direct gives separate readouts on all 4 tires to within 1 PSI. And Indirect only gives a, "Low Pressure Warning" if the tire gets below a certain PSI. Mine must be Direct because I have separate readouts on all 4 tires on both vehicles on the dash.
They say this information comes from the different rolling rates of the tires, as determined by the cars ABS system. I can see that as a comparison to each other, but how does that determine actual PSI? Not to mention determine it to within 1 PSI accurately? I have no idea how much 1 PSI would effect the distance of a rolling circumference of a tire. I'm sure it would vary from size, pressure, temperature, number of plies, load rating vs. actual load, etc. That's a LOT of variables to determine 1 PSI accurately.
This whole thing runs off small Lithium Ion batteries, which I assume are located in the tire valves themselves. According to the article they claim a battery life of 5 to 10 years. Which pretty much means replacement every time you buy new tires. Has anyone had this done? If so what did 4 new batteries / sensors / valves run? Or do they just replace the battery? Has anyone cut one apart?
I really like this feature, because you can easily determine a slow leak with the touch of a button on the dash. Instead of running around the car with a tire pressure gauge. It makes it effortless to properly monitor your tire pressure. Especially on the road. It could save you from having a blowout.
This system makes it easy to keep both my Jeep and Toyota within 1 PSI all the way around. And you can watch the difference in pressure go up or down from hot to cold, high speed driving compared to low, etc. Have any of you had any problems with these type of systems? I'm in the desert, but I wondered about driving through standing water, or freezing slush, then have the car exposed to below freezing temperatures. For you people living in the rust belt, how have they held up?
I found this.
https://www.tiresplus.com/tires/tire-buying-guide/tpms/
They say this information comes from the different rolling rates of the tires, as determined by the cars ABS system. I can see that as a comparison to each other, but how does that determine actual PSI? Not to mention determine it to within 1 PSI accurately? I have no idea how much 1 PSI would effect the distance of a rolling circumference of a tire. I'm sure it would vary from size, pressure, temperature, number of plies, load rating vs. actual load, etc. That's a LOT of variables to determine 1 PSI accurately.
This whole thing runs off small Lithium Ion batteries, which I assume are located in the tire valves themselves. According to the article they claim a battery life of 5 to 10 years. Which pretty much means replacement every time you buy new tires. Has anyone had this done? If so what did 4 new batteries / sensors / valves run? Or do they just replace the battery? Has anyone cut one apart?
I really like this feature, because you can easily determine a slow leak with the touch of a button on the dash. Instead of running around the car with a tire pressure gauge. It makes it effortless to properly monitor your tire pressure. Especially on the road. It could save you from having a blowout.
This system makes it easy to keep both my Jeep and Toyota within 1 PSI all the way around. And you can watch the difference in pressure go up or down from hot to cold, high speed driving compared to low, etc. Have any of you had any problems with these type of systems? I'm in the desert, but I wondered about driving through standing water, or freezing slush, then have the car exposed to below freezing temperatures. For you people living in the rust belt, how have they held up?
I found this.
https://www.tiresplus.com/tires/tire-buying-guide/tpms/
