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09-30-2016, 07:00 AM
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#1
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Senior Member
Tiffin Owners Club Freightliner Owners Club
Join Date: Aug 2014
Posts: 1,899
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Does your TST TPMS system read correct pressure?
I am getting ready to contact TST.
I have always had a different reading in the TST display compared to the actual pressure in the tires.
I have a calibrated tire gauge, and when I check the pressure on my Truck and Jeep, the OEM TPMS in each vehicle matches my gauge exactly.
All of the 10 sensors on the TST read 4 lbs low.
I now suspect there is a calibration setting (maybe a "offset" setting) in the TSTS head to compensate for this.
Was wondering if anyone has the same incorrect readings, and if they were able to get it corrected. I hate having to subtract 4psi everytime I look at the display.
Regards,
Dan
__________________
2014 40QBH Phaeton DP Cummins 380HP ISL, Freightliner XC, 2019 Jeep Grand Cherokee Trailhawk TOAD
Blue Ox Aventa tow bar, SMI Air Force One -Cave Creek, AZ.
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09-30-2016, 07:31 AM
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#2
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Senior Member
Join Date: Apr 2004
Posts: 3,794
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Don't have an answer, but will be watching this topic since my new EezTire TPMS also reads low compared to two different tire gauges.
__________________
George Schweikle Lexington, KY
2005 Safari (Monaco)Trek 28RB2, Workhorse W20, 8.1, Allison 1000 5 spd, UltraPower engine & tranny, Track bars & sway bars, KONI FSD, FMCA 190830, Safari Int'l. chapter. 1999 Safari Trek 2830, 1995 Safari Trek 2430, 1983 Winnebago Chieftain, 1976 Midas Mini
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09-30-2016, 07:39 AM
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#3
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Senior Member
Winnebago Owners Club Freightliner Owners Club
Join Date: Mar 2007
Location: Home on the hill in Georgia
Posts: 2,742
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Maybe its just me but I don't worry as long as its within a few pounds. I only depend on the TST to let me know if a tire starts going down. While running some tires build more pressure than others so being at a specific pressure when cold does not need to be absolute.
__________________
Jerry Potter, Taz
1999 Coachman Catalina Sport
[SIGPIC][/SIGPIC]
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09-30-2016, 07:40 AM
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#4
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Senior Member
Join Date: Jul 2012
Location: Fulltime, USA
Posts: 16,706
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I know that my tire pressures are good with my tire gauge, and the purpose of TPMS is alerting to over or under psi or temp. That and your pressures will read up or down from normal each morning when the tires are cold.
Checking and resetting your psi every morning is futile and not needed. I look at the monitor before launch and see that it is within range and then ignore it unless it alerts. It has never alerted. I do need to reset pressures once per year, but only slightly.
Relax and let the TPMS tell you when attention is required
This has been heavily discussed on many threads.
Happy Trails!
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09-30-2016, 08:36 AM
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#5
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Registered User
Monaco Owners Club
Join Date: Oct 2009
Location: Varies Depending on The Weather
Posts: 8,517
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Is it really THAT important!
What's more important is to set your CIP's with a calibrated tire psi gauge and only use that one for your tires.
What you are REALLY interested in is whether a tire is significantly different than others excluding for the sunny side of the coach.
You want to be alerted to a slow leak so that you are not running for hours on a under-inflated tire which WILL blow eventually because of the heat buildup caused by under-inflation.
Dr4Film ----- Richard
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09-30-2016, 09:42 AM
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#6
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Senior Member
Winnebago Owners Club Georgie Boy Owners Club
Join Date: Aug 2015
Posts: 477
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Its really that important to keep DW from freaking out.
__________________
Now in a Class C Coachman Leperchaun, trailer towing a 1950 Crosley Station wagon, or a '42 Pick-Up. Member of the Non-Affiliated Camping Group FMCA #F462997 RVM #146 Jon & Ellen
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09-30-2016, 09:56 AM
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#7
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Senior Member
Winnebago Owners Club
Join Date: Mar 2014
Posts: 14,890
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So put 4 lbs more pressure in the tire so the reading is what you want to see. 4 lbs is not a big deal in the grand scale of things and being slightly over is OK.
__________________
Gordon and Janet
Tour 42QD/InTech Stacker
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09-30-2016, 10:00 AM
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#8
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Community Administrator
Fleetwood Owners Club Workhorse Chassis Owner
Join Date: Sep 2010
Location: Marquette, Michigan "Da UP" & Lehigh Acres Florida
Posts: 21,827
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Quote:
Originally Posted by Wizard
Maybe its just me but I don't worry as long as its within a few pounds. I only depend on the TST to let me know if a tire starts going down. While running some tires build more pressure than others so being at a specific pressure when cold does not need to be absolute.
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Same with me.
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John & Cathy R.
06 Pace Arrow 38L Workhorse W24
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09-30-2016, 10:02 AM
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#9
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Senior Member
Monaco Owners Club
Join Date: Oct 2014
Location: Rigby, Idaho
Posts: 3,943
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Quote:
Originally Posted by Gordon Dewald
So put 4 lbs more pressure in the tire so the reading is what you want to see. 4 lbs is not a big deal in the grand scale of things and being slightly over is OK.
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This is what I do. I set my pressures so the TPMS shows the right pressure. I'm scanning the TPMS all day, I want it to be right.
__________________
Cheers,
TonyMac
2006 Monaco Safari Cheetah 40PMT
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09-30-2016, 11:23 AM
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#10
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Senior Member
Monaco Owners Club Winnebago Owners Club
Join Date: Sep 2011
Posts: 7,469
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Agree with others.
I don't look for TPMS to give me absolute/actual but rather use it to detect a change (leak).
__________________
US Navy Vet, Liberty Tree Member of Oath Keepers, NRA & VFW Life Member, Alaska EMT.
2009 Safari Cheetah 40 SKQ
2009 Winnebago Chalet 231CR
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09-30-2016, 11:24 AM
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#11
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Registered User
Monaco Owners Club
Join Date: Oct 2009
Location: Varies Depending on The Weather
Posts: 8,517
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Quote:
Originally Posted by TonyMac
This is what I do. I set my pressures so the TPMS shows the right pressure. I'm scanning the TPMS all day, I want it to be right.
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Well it won't be right "all day" !!!
This stuff is not rocket science and doesn't have to be perfect.
I set my low PSI alarms to be my actual CIP aim for the weight of the coach. Currently for the front it is 100 psi and for the rear it is 105 psi.
However I always load the tires with an extra 5 psi in each tire giving me a small safety margin, front 105 psi and rear 110 psi.
When we first start out in the morning the TPMS could be somewhere between the 100-105 psi for the front and 105-110 psi for the rear.
From that moment on the pressure rises until the tires hit their normal operating psi.
If any tire reaches it actual CIP aim it will alert me so I can pull over and check things out.
That way I never run with an under-inflated tire for very long if at all PLUS I am warned of a slow leak WELL in advance of the tire actually being under-inflated.
If the climate has changed significantly in the area that I am driving usually the tires will be either well under the CIP or well over the CIP. That's when I will re-adjust the psi's with my calibrated tire gauge.
That can happen once or twice driving from Alaska to Florida or the other direction.
Dr4Film ----- Richard
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09-30-2016, 11:27 AM
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#12
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Senior Member
Join Date: Apr 2004
Posts: 3,794
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Agree with the responses to monitor change in pressure and temperature rather than absolute pressure. Not a big deal, but just wanted to know if there is some sort of fine tuning "adjustment" in a TPMS
Quote:
Originally Posted by sdennislee
Agree with others.
I don't look for TPMS to give me absolute/actual but rather use it to detect a change (leak).
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__________________
George Schweikle Lexington, KY
2005 Safari (Monaco)Trek 28RB2, Workhorse W20, 8.1, Allison 1000 5 spd, UltraPower engine & tranny, Track bars & sway bars, KONI FSD, FMCA 190830, Safari Int'l. chapter. 1999 Safari Trek 2830, 1995 Safari Trek 2430, 1983 Winnebago Chieftain, 1976 Midas Mini
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09-30-2016, 11:40 AM
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#13
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Senior Member
Join Date: Nov 2005
Posts: 7,400
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Like you, my hi-pressure coach sensors read 3 lbs low but the low-pressure toad sensors are right on the dot. Cant imagine being able to adjust the sensors independently, so if adjustment were possible, think it would be global across all sensors......
__________________
Old Scout
2015 IH45 Foretravel
2003 Alpine 40' MDTS [Sold]
New Braunfels, Texas
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09-30-2016, 02:29 PM
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#14
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Moderator Emeritus
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 27,671
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Plus/minus 5% is the tolerance on most any pressure gauge other than laboratory grade equipment. 4 psi on a tire that is probably in the 100 psi range is within that spec.
__________________
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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