TMPS questions

[Chipf2]

I could some advice from all of you who are using TMPS. I have installed TST507RV with no flow sensors on my new G614 tires.
I filled the tires to 100psi. I set the sensors for 120# of pressure per the directions form TST.
I have 2 tires on the drivers side that increase pressures to 119 & 118psi which sets the sensors off.
Since I have followed the forum's advice and am now using TMPS with G614's, I am wondering what experiences and suggestions you have regarding cold pressure for the tires and settings for the TMPS.
My Monty is a 2012 3402RL.
Thanks in advance.

[bncinwv]

I run at about 105 psi and have the upper limit set at 130 and the lower limit set at 90. The pressures will increase with the heat of the day, with that said, I am not as near concerned with over-pressure as I am under-pressure. All I did was to keep adjusting up until I had a setting which did not trigger the alarms. The same applies to temperature since I have seen 10-20 degrees above ambient temperatures consistently. Merely relating my experience, since advice is cheap!
Bingo

[DQDick]

I run my 614's at 108-110# and have my TST's set for 134#. Like Bingo my bottom is 90#.

[Chipf2]

Thanks guys, that is most helpful. Appreciate your valuable input.
Chip

[Former StClairSailor]

I run my 614's at 100 psi cold. I have TST 507s. The air was filled at an ambient temperature of about 30 F. I set the low alarm at 85 psi. While traveling down to FL we stopped in IN and the temp dropped below zero the next morning. When starting up the low alarm went off. Noted the tires were all around 85 lbs. Once we got on the road the pressure rose to the 90s. When we got to AL and FL with temps in the 70s the pressure while driving rose to 105 to 109. So the weather has a lot to do with variations in pressure. But the user must remember to check the pressure when the tire is cold.

[Chipf2]

Thanks StClairSailor, We are having similar experiences with driving across the country this winter, from Northern NV, to Arizona, across the NM mountains, and now headed to FL next week. Last year is was from Maine down through Texas. Hope this helps others learn about how to use their TMPS systems just like I am doing using this forum. It is really helpful and I am grateful for all the input and sharing.

[DQDick]

It's not just the ambient temperatures that affect pressure, altitude does also. Most of our time is spent on the high plains or low plains with large temperature variations. That's why I changed to the 507 flow throughs so I can easily make adjustments.

[Chipf2]

Agree with DQDick as with most of his input.

[Art-n-Marge]

Chipf2, It's called TPMS (not TMPS), which stands for T)ire P)ressure M)onitoring S)ystem. Since you repeatedly used the incorrect spelling, I figured it was no longer a typo.

A TPMS is on my wishlist, but until then, I monitor my tire pressure and condition religiously, the old fashion way (a tire gauge and eyeballs). So far my trips have been short and hazard free and I do realize a TPMS would help with monitoring the inside condition of a tire and resulting air loss, or something that can occur with a tire while enroute. Is that the unit that is sold through Camping World?

And about the tires that set off the alarm, I wonder if you rotated the tires to the other side and if the alarm would follow those two tires. If not, then I would suspect your rig is heavier on the driver's side which means the tires would get hotter from the load.

Otherwise, I might think it just that those two tires just run hotter and you might try setting your threshold a little higher.

[Chipf2]

Thank you Art-n-Marge for your input.
You are correct regarding TPMS. I have a bit of an issue with dyslexia, and my fingers do not always follow my mind. So i stand corrected.
We just returned this evening from a 1700 mile foray to FL & back. I had reset the monitor as DQDick suggested and all was perfect.
We travel a lot, about 25-30,000 a year pulling the 5er, and I used to monitor the tires like you do, the old fashioned way. After my last trip from North TX to northern NV, and the last blowout of my G rated Hankook tires, I will never go on a trip without the TST TPMS system.
By the way, Camping World was no help to us with the TST TPMS system. I took the advice from our fellow MOC members to learn from their experiences, replaced my tires with Goodyear G614's and am now a believer and user of the TST TPMS monitor system.
Won't leave home without them!

I also agree that one side is heavier than the other because that is the side with the heavier appliances. Another reason to rotate the tires, like your vehicle, every 5-7,000 miles.

[rohrmann]

I run our G614's at least 100 psi, try to maintain 105 to 110 psi normally. If I remember correctly, the TST monitor comes default for the high pressure setting at 158 psi, which I left alone, and I have the low pressure setting at 100 psi. You will not only see pressure differences due to load, but also due to sunlight. The pressure and temperature will always be higher on the sunny side. You will also see changes due to road surface, new blacktop, old blacktop, and concrete.

[Chipf2]

Thanks rohrmann. I reset the TST monitor for 130 at the top and 90 for the lower pressure. I am keeping the cold pressure at 105. I add air or let it out as needed when I start a trip due to my ever changing locations. As I travel now, the pressures have generally ranged from about 117 to 122, depending on the different conditions like you mentioned.
Appreciate the additional input as we all can always learn from each other.

[winemaker]

I have just bought a Montana 3721RL and plan on changing the tires to Sailun S637 0r G614. The info on this site is very useful. I noticed on the comments that TPMS readings are going up to 120 psi when the tire gets warmed up. The rims have a rating of 110 lb. Has anyone had any issues with rims giving out with the increased pressure.

quote:Originally posted by Chipf2

I could some advice from all of you who are using TMPS. I have installed TST507RV with no flow sensors on my new G614 tires.
I filled the tires to 100psi. I set the sensors for 120# of pressure per the directions form TST.
I have 2 tires on the drivers side that increase pressures to 119 & 118psi which sets the sensors off.
Since I have followed the forum's advice and am now using TMPS with G614's, I am wondering what experiences and suggestions you have regarding cold pressure for the tires and settings for the TMPS.
My Monty is a 2012 3402RL.
Thanks in advance.

[rohrmann]

It doesn't matter what the hot pressures are, the wheels are designed to handle the increased pressure from use. The 110 psi rating is strictly the cold inflation pressure. We regularly exceed 120 psi when traveling with no problem.

[Chipf2]

Agree with rohrmann. Cold inflation pressure is the key starting point. Pressures will increase for many reasons as they are designed to do. Temps, altitude, weight,the road surface, etc. all affect the "running down the road" psi.