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Old 12-04-2013, 06:37 AM   #1
K0LCB
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TST

I bought Kohl's TST System and installed on my trailer. Is it normal for pressure to increase 10 to 15 lbs?
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Old 12-04-2013, 07:32 AM   #2
bncinwv
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Yes, ours will start at 105-110 and when running will approach 120 psi.
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Old 12-04-2013, 07:45 AM   #3
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Thank you, Mr. Bingo!
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Old 12-04-2013, 08:35 AM   #4
dieselguy
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Not so much in the winter months, but in the summer, mine raise about 10-12 psi once down the road about 25 miles. The tires also read higher if only one side is in the sun for an extended period of time.
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Old 12-04-2013, 10:07 AM   #5
K0LCB
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I noticed the tires on one side will be warmer, but it looks like pressure increase in all
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Old 12-04-2013, 11:00 AM   #6
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Same as Dieselguy. I would add things can take a big increase dropping down out of the mountains also. Temps and pressure change.
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Old 12-04-2013, 11:05 AM   #7
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Do not let any air out! This is normal for all types of tires. This extra air is taken into consideration for the tires and rims from the manufacturer even though it maybe over the max rating.
Do not exceed the max rating when tires are cold.

That's why they sell nitrogen to fill your tires, there is no increase in pressure when the tires get hot. Professional racing has been using it for years.
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Old 12-04-2013, 11:27 AM   #8
K0LCB
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Thanks for the info! I didn't plan to release any air, yet. I have thought about nitrogen fill
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Old 12-04-2013, 12:52 PM   #9
Irlpguy
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Quote:
quote:Originally posted by K0LCB

I bought Kohl's TST System and installed on my trailer. Is it normal for pressure to increase 10 to 15 lbs?
As everyone has said it is normal, the normally "accepted" amount of increase in pressure is right around 1 psi per 10 degrees of change in temperature.

Not to say you don't want to consider it but increases/decreases in tire pressure due to elevation gain/loss are really pretty insignificant, the change from sea level to 10,000' is only about 4.6 psi according to this website: http://www.engineeringtoolbox.com/ai...ure-d_462.html I would not worry about that decrease.

The ambient temperature and the increase in temperature created within the tire from it's load create the greatest pressure increase in the tire.




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Old 12-04-2013, 02:52 PM   #10
Devildog
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Pressure increase is normal, and during the summer I can tell which side of the camper the sun is shining on.
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Old 12-05-2013, 06:35 AM   #11
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I agree elevation makes little difference, but temperature is a different story. I typically check the tires on my Monty sitting on the driveway every month. There is typically between 1-5 lbs of pressure loss from the prior check. We just went on a Thanksgiving outing with the Monty and the pretrip check showed they were about 10-12 lbs less and the only major difference was that the weather at the house was much colder than the last check (about 90 degrees a month ago, to a current temp of about 60 degrees during the day). I filled them to 80 psi anyway, went on the trip, had no issues. Then 10 days later on the drive home the psi was fine still about 60 degrees so the temp hadn't changed. We got home fine. However, the CG was only 12 miles and therefore a very short trip.

A TPMS would sure making checking temps a lot easier. Just start it up and look at the screen. But chances are I'd still need the hardware since they always seem to need air. I've read from others it is not unusual for the temps and psi to increase as the tires get heated up from driving around. This is why you only add air only when the tires are cold like what is recommended by everybody. The tires may also increase heat and psi on the heavier loaded tires too.
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Old 12-05-2013, 07:53 AM   #12
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The other thing to be aware of is that the truck exhaust can impact the temp readings. Couldn't understand why on a hard pull the curb side tires were warmer even when they were on the shade side. When I realized they cooled down going down hill I realized it was the exhaust.
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Old 12-06-2013, 11:04 AM   #13
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Quote:
quote:Originally posted by Ishler

The other thing to be aware of is that the truck exhaust can impact the temp readings. Couldn't understand why on a hard pull the curb side tires were warmer even when they were on the shade side. When I realized they cooled down going down hill I realized it was the exhaust.
That's especially true when they go into regen mode.
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Old 12-08-2013, 02:20 AM   #14
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Quote:
quote:Originally posted by Tom S.

Quote:
quote:Originally posted by Ishler

The other thing to be aware of is that the truck exhaust can impact the temp readings. Couldn't understand why on a hard pull the curb side tires were warmer even when they were on the shade side. When I realized they cooled down going down hill I realized it was the exhaust.
That's especially true when they go into regen mode.
...and I was thinking raised temps was due to kitchen slide on curb side. Learn new facts each time I read this forum. Now I do know several heads are better than One.
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Old 12-23-2013, 09:19 AM   #15
JandC
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What I noticed on our 1200+ trip we just completed was that in really cold temps (20-25 degrees) and running 65mph I still saw an increase of 7-8 pounds. After getting down south and the temps in the high 70's I started seeing higher readings around 118-122 pounds.
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Old 12-23-2013, 02:46 PM   #16
Bigsky3625RE
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Quote:
quote:Originally posted by DQDick

Same as Dieselguy. I would add things can take a big increase dropping down out of the mountains also. Temps and pressure change.
As DQ said, ambient temperature and altitude play big time.

I have post about it. 37 degrees in Banff. Set tires to 120psi. When got to the states it was 75 degrees and we got an alarm for high pressure.

And we do see a 10 to 15psi increase as we travel.
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Old 12-28-2013, 10:57 AM   #17
mach111
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I am seeing a 10-15 psi increase on our tires also with the TST System. Since reading this info I am not alarmed but a watchful eye is good.
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Old 12-29-2013, 01:48 AM   #18
DonandBonnie
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We too have seen the pressure change. When we are parked the truck naturally loses the trailer signal as we drive around. When we return the pressure reads about 90-95 lbs. when the signal again picks up. Within a mile or two after hooking up and hitting the road, pressures return to the 110 lbs. range. I've wondered whether the TST requires motion to pick up a proper reading.
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