G614 tire pressure changes

[jfaberna]

One morning recently, I set all my G614s to 110 psi. I forget the temperature, but it was cool. I used my TST 507 as my pressure meter. It agrees with a good dial gauge I have, so I feel good about accuracy.

However, I've checked it with the TST 507 several mornings with cooler and warmer temperature. On the 50 deg mornings it's at 108 and on 70 deg mornings it's 112. Since winter is approaching and it will get towed in these temperatures or lower, I'm wondering if it's close enough at this point?

[WeBeFulltime]

You're worried about 2 psi +/- ? LOL !

[jfaberna]

Not worried, just doing the best I can. I don't want to be one of those on the side of the road with a blowout. I talked to a Montana owner who is not a MOCer and he has had at least one blowout every year for the last 10 years of owning his Montana. He seems to accept this as normal. Obviously, he was not going to pay the premium for G614s. However, he's spent thousands to repair his fenders.

[DonandBonnie]

We've noticed what we think were unusual fluctuations with our TST. We recently inflated all of our tires, TV and Big Sky, with a portable compressor with a built in gauge to the proper pressures. We checked each tire with a hand held gauge. The two readings matched. The reading on the TST was 2 to 3 pounds lower than the gauges. That leads us to the conclusion that the TST is close but not dead on accurate.

We have also noticed that after being unhooked in camp for a while the TST will read 15 to 20 pounds low on the Big Sky. A hand gauge reading will show proper pressure. When we get back on the road the TST will read proper Big Sky pressures within a mile or less from the point that motion starts. It seems that there must be a relationship between motion and accurate readings.

[Tom S.]

Tire pressure is very dependent on ambient air temps as well as sun light. I've seen several pound difference in our tire pressure from the side in the sun to side in the shade, and also noticed a hefty difference between morning pressures and afternoon pressures on those weird Michigan days that start out at 30 degrees and end up in the 70's. I only concern myself at the point I'm getting ready to leave, no matter what the ambient temps happen to be. That is to say if the outside temp is 50, and I'm ready to leave, as long as the tire pressure is ok (80 psi for me), I'm good to go. Tire manufacturers state cold pressure as a starting point, knowing the tire pressure is going to increase as the tires get warmer. Most tires fail from under inflation.

[DQDick]

Since we mostly travel in warmer weather, I keep mine around 108. Sometimes it's up to 110 and others down to 105. As long as I'm in that range I don't mess with them. I've also found that the 507's have a much better chance of agreeing with my high dollar trucker's tire gauge than the sensors on my truck.

[JandC]

I keep mine in the 100 range. When towing on hot days I can easily get readings in the 116-118 range. I just never wanted to set mine at 110 while sitting someplace where it was 60 or 70 degrees, and then traveling in hot temps and allowing the reading to go over 120.

[sambam]

My compressor will only inflate to 105 PSI. That's what I put in the tires. When traveling, they always go up a few pounds from there. Camping in NH recently, I woke up to hear a beeping sound and couldn't figure where it was coming from. I concluded that someone had an issue with a battery or something. Later, when I went outside, I realized the beeping was coming from my 507 monitor in the truck. I had forgotten to shut it off when we arrived, and the tire pressures had dropped below my presets due to the cold night.

[DQDick]

quote:Originally posted by JandC

I keep mine in the 100 range. When towing on hot days I can easily get readings in the 116-118 range. I just never wanted to set mine at 110 while sitting someplace where it was 60 or 70 degrees, and then traveling in hot temps and allowing the reading to go over 120.

On a hot day mine continually run in the 124-126 range. Not a problem for them.

[Hooker]

Don't over think TP. Set the pressure in the morning when you leave to what it should be then at that temp...don't anticipate temp change.