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AJMike · 05-14-2022, 11:21 AM

I just bought a TireMinder TPMS system for the Jeep I will be flat towing. I specifically bought only a 4 sensor system because the Sprinter chassis used by the RV already has a tire pressure warning light that illuminates when any tire pressure drops. I know that it does not tell me the actual tire pressure, and it may not warn me of temperature increases, but I assumed that the built-in Sprinter system would warn me of any big pressure drop and that I would feel any blow out on the RV in any case.

Are my assumptions wrong?

Country Road · 05-14-2022, 12:39 PM

Quote:

Originally Posted by AJMike

I just bought a TireMinder TPMS system for the Jeep I will be flat towing. I specifically bought only a 4 sensor system because the Sprinter chassis used by the RV already has a tire pressure warning light that illuminates when any tire pressure drops. I know that it does not tell me the actual tire pressure, and it may not warn me of temperature increases, but I assumed that the built-in Sprinter system would warn me of any big pressure drop and that I would feel any blow out on the RV in any case.

Are my assumptions wrong?

No. It should take care of your tire pressure fluctuations. Any OEM system certainly will tell you of pressure drops.

**pasdad1** · 05-14-2022, 02:34 PM

I would still want a TPMS over the OEM system, and here is why….

The OEM will only illuminate a light on the dash when pressure drops below a programmed number. In my experience that number is pretty low. Just 1 PSI above that number, and you think everything is wonderful, when in fact it is not.

Before I start driving for the day I want to know all tires are at the proper pressure, and the external TPMS will give me that information. If there is a slow leak, the external TPMS lets me monitor the pressure as I drive and make the decision if it is safe to continue, and get it fixed at my next stop. The OEM system will only alarm after you have lost a significant amount of pressure, and you have no idea how fast the pressure is dropping.

Crasher · 05-14-2022, 07:25 PM

If you recall. There was a time when TPMS did not exist. We checked the tire pressures once a week or when we felt like it and went around each morning with a "Thumper" confirming the pressure by the sound. I don't recall unusual tire failures using that method. Try to find out at what pressure you get the alarm sounding. It's probably at or close to the minimum required for the load. You should be fine with your setup. That is, unless you want to get more anal like the rest of us. Then you need to add sensors to every tire and look at the monitor every 15-20 minutes.

Dodge Guy · 05-14-2022, 08:54 PM

You’ll be fine with just the towed monitor. The OEM system will work fine.

jadatis · 05-15-2022, 04:28 AM

TMPS gives also new worries, if you mis-interprate the given info.
Given temperature if external sensors are not reliable, because gives probably exact the temperature at the end of the valve, and not of tire inside.
But you can calculate the temp in tire by the pressure-change.

And dont worry about a high warm pressure, certainly dont lower it, then tire inside, and more important, temp of tire material, get even hotter.

Country Road · 05-15-2022, 07:15 AM

Quote:

Originally Posted by pasdad1

I would still want a TPMS over the OEM system, and here is why….

The OEM will only illuminate a light on the dash when pressure drops below a programmed number. In my experience that number is pretty low. Just 1 PSI above that number, and you think everything is wonderful, when in fact it is not.

Before I start driving for the day I want to know all tires are at the proper pressure, and the external TPMS will give me that information. If there is a slow leak, the external TPMS lets me monitor the pressure as I drive and make the decision if it is safe to continue, and get it fixed at my next stop. The OEM system will only alarm after you have lost a significant amount of pressure, and you have no idea how fast the pressure is dropping.

Just for clarity for some, my ‘19 Ford F-350 and ‘21 Wrangler both give me the actual psi numbers when the pressure is low.

jadatis · 05-21-2022, 09:13 AM

Can also be that you have indirect pressureloss detection , working on ABS system.
Then lower pressure gives smaller rolling circumference, so the one wheel makes more cicles a second, wich ABS detects.
My car gave alarm when one tire leaked,
Measured it with a gauge at home , 1.7 bar , while the other side on axle 2,6 bar, so 65% of pressure.
And then no pressure reading.