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12-04-2013, 05:37 AM
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#1
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Montana Master
Join Date: Apr 2013
Location: Arroyo City
Posts: 3,110
M.O.C. #13395
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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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12-04-2013, 06:32 AM
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#2
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Montana Master
Join Date: Feb 2007
Location: Winfield
Posts: 7,327
M.O.C. #6846
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Yes, ours will start at 105-110 and when running will approach 120 psi.
Bingo
__________________
Bingo and Cathy - Our adventures begin in the hills of WV. We are blessed by our 2014 3850FL Big Sky (previous 2011 3750FL and 2007 3400RL) that we pull with a 2007 Chevy Silverado Classic DRW CC dually.
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12-04-2013, 06:45 AM
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#3
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Montana Master
Join Date: Apr 2013
Location: Arroyo City
Posts: 3,110
M.O.C. #13395
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Thank you, Mr. Bingo!
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12-04-2013, 07:35 AM
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#4
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Montana Master
Join Date: Feb 2005
Location: Haysville
Posts: 4,261
M.O.C. #3085
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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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12-04-2013, 09:07 AM
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#5
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Montana Master
Join Date: Apr 2013
Location: Arroyo City
Posts: 3,110
M.O.C. #13395
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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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12-04-2013, 10:00 AM
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#6
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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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.
__________________
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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12-04-2013, 10:05 AM
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#7
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Montana Master
Join Date: Oct 2012
Location:
Posts: 608
M.O.C. #12894
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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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12-04-2013, 10:27 AM
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#8
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Montana Master
Join Date: Apr 2013
Location: Arroyo City
Posts: 3,110
M.O.C. #13395
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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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12-04-2013, 11:52 AM
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#9
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Montana Master
Join Date: Oct 2012
Location: Chilliwack
Posts: 1,520
M.O.C. #12935
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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?
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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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12-04-2013, 01:52 PM
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#10
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Montana Fan
Join Date: Nov 2005
Location: Ooltewah
Posts: 360
M.O.C. #4958
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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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12-05-2013, 05:35 AM
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#11
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Montana Master
Join Date: Apr 2009
Location: Murrieta
Posts: 5,816
M.O.C. #9257
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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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12-05-2013, 06:53 AM
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#12
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Montana Master
Join Date: Apr 2004
Location: Ontario
Posts: 722
M.O.C. #1328
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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.
__________________
Mike & Donna Ishler Ontario, NY KE2LU FN13
2017 3720RL TST S637's
2017 Dodge 3500 Laramie CTD 4x4 Auto
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12-06-2013, 10:04 AM
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#13
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Montana Master
Join Date: Aug 2007
Location: Waterford
Posts: 3,693
M.O.C. #7500
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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.
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That's especially true when they go into regen mode.
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12-08-2013, 01:20 AM
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#14
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Montana Fan
Join Date: Jan 2013
Location: Fountain Inn
Posts: 209
M.O.C. #13142
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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.
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That's especially true when they go into regen mode.
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...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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12-23-2013, 08:19 AM
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#15
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Montana Master
Join Date: Mar 2013
Location: Frostproof, FL USA
Posts: 2,362
M.O.C. #13272
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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.
__________________
Previous: 2008 Montana 3400RL & 2014 3725RL
Current: Full Time 2022 SOB TT Toy Hauler
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12-23-2013, 01:46 PM
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#16
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Montana Fan
Join Date: Sep 2012
Location: Redmond
Posts: 274
M.O.C. #12815
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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.
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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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12-28-2013, 09:57 AM
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#17
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Montana Fan
Join Date: Jan 2013
Location: Fountain Inn
Posts: 209
M.O.C. #13142
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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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12-29-2013, 12:48 AM
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#18
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Montana Master
Join Date: Jun 2006
Location: Madison
Posts: 1,239
M.O.C. #5906
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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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