Community Forums

RubiconTrail · 05-18-2016, 06:45 PM

I know, exciting, right?

So I have Truck Systems Technologies (TST) 510 TPMS with 12 sensors for the Anthem and the toad. In general I like it...easy to read, no issues connecting with sensors, alarm is alarming without being frightening, etc.

Here's the problem: there is anywhere from three to five psi variation in the reading between sensors on a given tire, and at higher pressures (>85 psi) the TPMS sensor reads 2-3 psi less than all of my handheld tire gauges (which all read the same) and at lower pressures (>40psi) the TPMS sensor reads ~5psi lower than the gauges.

TST says this is in the "acceptable error" range, that it is likely to be my multiple high quality gauges that are the problem, and that I should adjust my psi parameters in the TPMS to "cheat" the correct pressure.

I don't like it a bit, the OCD piece of me says that for $500 plus it should be "right".

Anybody have a TST system with these problems? How about other brands? Do they do the same thing? Is this as good as it gets? Really?

ADA · 05-18-2016, 07:27 PM

I have a TPMS and there are some small differences in the pressure that it reports and the pressure that I have inflated a tire to with a high quality pressure gauge. They are within the accuracy of the TPMS device as reported by the manufacturer.

I am not too concerned about this. What is important is that any slow leak, any rapid depressurization, and/or any significant rise in temperature be detected and brought to my attention before any damage is done.

It is the relative changes that are critical, and not the absolute accuracy of the measurements that are important.

tmw188 · 05-18-2016, 07:32 PM

Quote:

Originally Posted by ADA

I have a TPMS and there are some small differences in the pressure that it reports and the pressure that I have inflated a tire to with a high quality pressure gauge. They are within the accuracy of the TPMS device as reported by the manufacturer. I am not too concerned about this. What is important is that any slow leak, any rapid depressurization, and/or any significant rise in temperature be detected and brought to my attention before any damage is done. It is the relative changes that are critical, and not the absolute accuracy of the measurements that are important.

Yes x2

vsheetz · 05-18-2016, 07:33 PM

I have TST. Variances are a few pounds from one sensor to another and to a quality gauge. IMHO, like in horse shoes and nuclear weapons - close counts. The function of the system to provide advise of a leaking tire is still there.

Lv2Roam2 · 05-18-2016, 08:23 PM

Ditto X 3...my TST system works just fine with a few pounds difference between tires and gauges...temperatures also vary a few degrees between tires...

jestal · 05-18-2016, 09:09 PM

My TST system reads very accurately. I am always within 1 psi of the sensor with my calibrated gauge. In fact, the system has surprised me with its accuracy. Having said that, I don't consider it a big deal. The senors provide the real time reading which is going to change considerably with speed and tire temperature, sunload, etc. so the change in the pressure is the issue not the absolute value.

RubiconTrail · 05-18-2016, 10:08 PM

All reasonable answers, thanks. A pound or so would be fine. I feel like five is a lot. But I do see the value of monitoring changes.

Marcosdad · 05-19-2016, 07:13 AM

It reminds me that a man with two watches never knows what time it really is.

brobox · 05-19-2016, 07:37 AM

I read a couple of owners manuals when shopping for a TPMS. All of them said +or- a couple of PSI is normal and not to use the TPMS in place of and air gauge.

Gary.Jones · 05-19-2016, 07:55 AM

Rubicon

My opinion is that your OCD is overactive 😀👍. I have a different system and I get minor and larger differences between and across my sensors. I don't have any concern about that because it is not particularly important. What is important is amount and rate of change in either pressure or temperature which most indicate impending serious problems. A 30 degree change in temperature over a short period of time is something to pay serious attention to, as would be the same for pressure, however small differences between sensor and manual pressure reading are not something I pay any attention to. Now big differences between manual gauge and my TireMinder system are always an indication of either sensor failure or weakening or failure of sensor batteries.

Gary

CampDaven · 05-19-2016, 08:01 AM

I have TST. I check with my digital gauge against TST. All are within 1 lb. if it's luck, I'll take it.
TPMS is dual purpose: not only a security monitor, also a security guard (similarities to a silly data security commercial intended)

Dave and Nola, RV Mutants

LVUS101 · 05-21-2016, 12:52 AM

Quote:

Originally Posted by RubiconTrail

I know, exciting, right?

So I have Truck Systems Technologies (TST) 510 TPMS with 12 sensors for the Anthem and the toad. In general I like it...easy to read, no issues connecting with sensors, alarm is alarming without being frightening, etc.

Here's the problem: there is anywhere from three to five psi variation in the reading between sensors on a given tire, and at higher pressures (>85 psi) the TPMS sensor reads 2-3 psi less than all of my handheld tire gauges (which all read the same) and at lower pressures (>40psi) the TPMS sensor reads ~5psi lower than the gauges.

TST says this is in the "acceptable error" range, that it is likely to be my multiple high quality gauges that are the problem, and that I should adjust my psi parameters in the TPMS to "cheat" the correct pressure.

I don't like it a bit, the OCD piece of me says that for $500 plus it should be "right".

Anybody have a TST system with these problems? How about other brands? Do they do the same thing? Is this as good as it gets? Really?

All of my sensors are off by three pounds. I have sent the monitor back and the new monitor reads 3 pounds low also. The sensors work most of the time. I have had an occasional sensor stopped working for a short period of time.
One of the larger problems I have had is connected to the inner Drive Tire valve stem extensions. The inter valve stem extensions have a hard time both excepting air and giving a good clean reading with TST sensing units. Others have reported the same issue on these extensions.

RubiconTrail · 05-21-2016, 08:53 AM

Yup, having that problem also...some discussion in other threads about replacing the extension on the inner drive tire with a different brand/configuration and that is supposed to fix that problem.

hogdriver · 05-21-2016, 08:59 AM

Do what I did with my TST system (in use on my first then on my second Entegra), I removed the inner dual extension. Voila, no more low readings or false alarms. The flow thru 507 sensor extends almost as much as the original extension so it is easy to add air.

After two blowouts on my old Monaco I still manually check my tire pressures before any long drive days or after sitting for a week. I rely on my TST for alarms on sudden tire pressure loss and pull over. After my front blowout and after seeing some of those RV crash pictures, I'm very careful with tire pressure and avoiding tire damage.