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06-10-2016, 05:36 AM
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#141
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Rivet Master
2015 23' Flying Cloud
2023 Interstate 19
Scottsdale
, Arizona
Join Date: Oct 2015
Posts: 571
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Thanks for the link. Interested to know if others go with the recommended 20% and 10% high/low settings?
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06-10-2016, 05:38 AM
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#142
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Rivet Master
2012 27' Flying Cloud
W
, New England
Join Date: Oct 2012
Posts: 7,402
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Quote:
Originally Posted by cactusjk
Thanks for the link. Interested to know if others go with the recommended 20% and 10% high/low settings?
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You're welcome. I personally go with those recommendations. My tires want 50 PSI. My alarms are set for 60 and 45 on the high and low ends. I have the TST TPMS with internal sensors.
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06-10-2016, 05:45 AM
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#143
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Rivet Master
2015 23' Flying Cloud
2023 Interstate 19
Scottsdale
, Arizona
Join Date: Oct 2015
Posts: 571
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Good to know. I know some base it on actual TT weight as measured on a truck scale but I prefer to take the easier approach for now.
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06-10-2016, 11:50 PM
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#144
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4 Rivet Member
2015 30' Classic
Sherwood
, Oregon
Join Date: Mar 2015
Posts: 479
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Quote:
Originally Posted by cactusjk
Thanks for the link. Interested to know if others go with the recommended 20% and 10% high/low settings?
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Yes, I inflate to 65 and set the TST to 20% high and 10% low. I have the stem mounts.
__________________
2015 Classic 30A, Blue OX Sway Pro, 2016 F350 4x4 Ultimate Lariat crew cab SRW, LWB, 6.7 PSD, 20" wheels, Ingot Silver Metallic, DiamondBack tonneau cover, TrailFX wheel-to-wheel step bars.
Sold: 2014 25FB International Serenity
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06-13-2016, 06:19 AM
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#145
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1 Rivet Member
Commercial Member
1989 32' Excella
Cumming
, Georgia
Join Date: Mar 2005
Posts: 13
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Tst tpms
I recommend the cap sensors over the flow through because they are more durable and less likely to be damaged.
There are thousands of Airstreams using this system now with no problems
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06-13-2016, 06:22 AM
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#146
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1 Rivet Member
Commercial Member
1989 32' Excella
Cumming
, Georgia
Join Date: Mar 2005
Posts: 13
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Those are reasonable settings.
It may depend on the ambient temperature of the area you are traveling i.e. Altitude, extreme heat or cold.
Good starting point though
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06-02-2018, 04:36 PM
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#147
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The Aluminum Tent 3
2014 23' Flying Cloud
Park City
, Utah
Join Date: Aug 2015
Posts: 2,157
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Thought it might be worth bumping up this thread a couple years later. I am installing my TST 507 flow through system, taking my wheels to the tire shop two at a time to get metal stems attached. Tire place recommends not balancing with the sensor attached to the stem. They say they're too light to matter; and could even throw things off. Which was suspect to me. If they are too light to matter, then how could they be heavy enough to 'throw off the machine."
Any opinions? I'm going to call TST Monday morning to ask them. Tire shop has my first two tires and will do them first thing Monday.
I also will be installing Centramatic balancers when I put the wheels back on, along with solid lug nuts. If not balanced with the sensors on, any possible out of balance condition caused by the sensors would be handled by the Centramitics?
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06-03-2018, 06:30 PM
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#148
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2 Rivet Member
1987 25' Sovereign
Aurora
, Illinois
Join Date: Feb 2013
Posts: 20
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Thanks pc for bumping this thread. Sorry that I have no experience to share on the balancing impact of external sensors. My opinions would be just that, opinions. My interest here is in the installation of the TST 507 Repeater. Would it be a mistake to:
1) install the repeater on the jack tower
2) zip tie the power cord to the TT umbilical cord
3) insert + & - wires into 7 pin connector
4) connect + wire to 12 volt Aux/Charging contact
5) connect - wire to ground contact ?
Wouldn’t this set up make it unnecessary to install a switch for the repeater, as it would only be powered when the TT and TV were connected via the 7 pin umbilical cord?
Thanks,
Bill
__________________
BillB54
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06-03-2018, 06:36 PM
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#149
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Rivet Master
1991 34' Excella
Princeton
, New Jersey
Join Date: Aug 2003
Posts: 7,070
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Battery power and ground appear in the umbilical cable from the trailer battery.
The repeater would be on all time.
As for the mounting of the repeater on or near the jack that should not be a problem. The repeater is a high frequency unit and should not be effected by the jack
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06-03-2018, 06:58 PM
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#150
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2 Rivet Member
1987 25' Sovereign
Aurora
, Illinois
Join Date: Feb 2013
Posts: 20
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Thanks Howie
Now that you have pointed it out, it seems obvious.
The female receptacle of any “extension cord” (umbilical) would be hot, if the male end were connected to a power source (battery).
I guess I’ll power from the power jack and install a weather proof switch.
__________________
BillB54
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06-03-2018, 07:32 PM
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#151
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Rivet Master
1964 26' Overlander
1974 31' Sovereign
Milton
, ON
Join Date: Oct 2002
Posts: 1,225
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Quote:
Originally Posted by billb54
Thanks Howie
Now that you have pointed it out, it seems obvious.
The female receptacle of any “extension cord” (umbilical) would be hot, if the male end were connected to a power source (battery).
I guess I’ll power from the power jack and install a weather proof switch.
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What about connecting to the running light wire in the umbilical instead of the charge line? It would only have power when you're driving, IF you always travel with your lights on. I do, but I know not everyone does.
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06-04-2018, 04:04 AM
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#152
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Rivet Master
2007 20' Safari
Old Orchard Beach
, Maine
Join Date: Sep 2014
Posts: 509
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My TST caps (purchased at a NAPA store) on my trailer's tire stems communicate wirelessly with the little receiver adhered to my dashboard by Velcro without any kind of intermediate relay device. The receiver has a cord that plugs into the cigarette lighter.
__________________
Marty Womer
Old Orchard Beach, Maine
Trailer name: Quarantina
2019-2022 President, Northeast Mountaineers Airstream Club
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06-04-2018, 05:57 AM
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#153
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3 Rivet Member
2006 16' International CCD
Steamboat Springs
, Colorado
Join Date: Mar 2017
Posts: 132
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Our wheels were balanced with sensors attached.
Quote:
Originally Posted by pcskier
Thought it might be worth bumping up this thread a couple years later. I am installing my TST 507 flow through system, taking my wheels to the tire shop two at a time to get metal stems attached. Tire place recommends not balancing with the sensor attached to the stem. They say they're too light to matter; and could even throw things off. Which was suspect to me. If they are too light to matter, then how could they be heavy enough to 'throw off the machine."
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Discount Tires balanced our wheels with the flow through sensors installed. They never brought up any issue about doing so.
__________________
2006 16' International CCD pulled by 2016 Toyota 4runner
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06-04-2018, 05:57 AM
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#154
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CapriRacer
I'm in the
, US
Join Date: Sep 2012
Posts: 991
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I just noticed this thread and I think the upper and lower limits posted above are wrongheaded. I think the values ought to be -10% / +15% is wrong. Here's why:
All vehicles ought to have tires that are rated for 15% OVER the actual max loads encountered. In the case of cars, that is pretty much a given. Same for trucks produced since 2008. Trailers? Not so much.
That means the a loss of 10% of the inflation pressure will still have enough load carrying capacity, although it isn't ideal.
Upper limit? There's a rule of thumb that says that normal pressure buildup should not be greater than 10%. That's because at 10% the heat being generated is within the operating range of the rubber over the long haul. - and a 15% buildup is cause for immediate action as that level generates enough heat to cause permanent damage in the short term.
If we also take into account that a 10 degree F increase in ambient temp results in a 3% increase in pressure, the 15% value is a reasonable alert level.
__________________
CapriRacer
Want to learn about tires? Please visit my website: Barry's Tire Tech New content every month!
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06-05-2018, 08:23 AM
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#155
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Rivet Master
Commercial Member
Ravenna
, Ohio
Join Date: Apr 2012
Posts: 1,344
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Slightly different approach than Capri on setting TPMS.
Aug 1 2017, I did a long blog post (check my profile as I can't post the blog here) where I cover the "why" I do it the way I do.
I set the low pressure level at pressure needed to support the measured load.
For multi-axle trailers, I recommend the cold tire sidewall pressure due to Interply Shear. My Hot pressure warning is set at +10 to +20% of cold pressure. I like Capri's 15% for a max but am concerned about the folks that do not have a 15% margin on load getting many high-pressure warnings and eventually disconnecting the TPMS altogether.
For Max temperature, I am good with 158F. I am writing a series on Internal TPM vs External TPM and have confirmed a significant temperature reading difference. BUT if the load and cold pressure are set correctly this temperature reading difference is not of concern as long as we understand why.
__________________
Retired tire engineer (50 years). Write a blog on RV Tire Safety Net. Give seminars for FMCA across the US. Tucson AZ in Mar 2024 is next.
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06-05-2018, 09:04 AM
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#156
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Rivet Master
2012 27' Flying Cloud
W
, New England
Join Date: Oct 2012
Posts: 7,402
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TST Tire Pressure Monitoring System
Quote:
Originally Posted by Tireman9
Slightly different approach than Capri on setting TPMS.
Aug 1 2017, I did a long blog post (check my profile as I can't post the blog here) where I cover the "why" I do it the way I do.
I set the low pressure level at pressure needed to support the measured load.
For multi-axle trailers, I recommend the cold tire sidewall pressure due to Interply Shear. My Hot pressure warning is set at +10 to +20% of cold pressure. I like Capri's 15% for a max but am concerned about the folks that do not have a 15% margin on load getting many high-pressure warnings and eventually disconnecting the TPMS altogether.
For Max temperature, I am good with 158F. I am writing a series on Internal TPM vs External TPM and have confirmed a significant temperature reading difference. BUT if the load and cold pressure are set correctly this temperature reading difference is not of concern as long as we understand why.
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Re: internal vs external sensors - this is a good point to probe. I had the internal sensors and noticed that pressures would rise about 10% - slightly more if temps went up from 70 when I started to 90 a couple hours in. And internal temps rose about 30 degrees above ambient.
My internal sensors batteries seemed to have died and TST sent me external ones which showed the same pressure changes as the internals, but temps would only rise 5-10 degrees above ambient. I assume it's hotter inside the tire than outside where it dissipates but wondering if the 158 degree warning point would be lost on an external sensor?
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06-05-2018, 09:29 AM
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#157
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Rivet Master
2017 26' Flying Cloud
Tampa
, Florida
Join Date: Feb 2017
Posts: 7,654
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I have a shiny new 507 system waiting to go on.
My thought with the repeater is to mount it on the propane tank cover (it's waterproof) and adding a two prong connector to the wire and use the Zamp connector while towing.
First, I'll see if I even need the repeater.
Note to TST: What the heck? The new color monitor comes with a suction cup mount, but if you don't want to use it, nothing mates to common mounts. I-grip? No. Ram? No. Go Pro? No.
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06-07-2018, 10:11 PM
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#158
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Rivet Master
2013 25' FB Flying Cloud
Longmont
, Colorado
Join Date: Jan 2012
Posts: 1,107
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Quote:
Originally Posted by SteveSueMac
Re: internal vs external sensors - this is a good point to probe. I had the internal sensors and noticed that pressures would rise about 10% - slightly more if temps went up from 70 when I started to 90 a couple hours in. And internal temps rose about 30 degrees above ambient.
My internal sensors batteries seemed to have died and TST sent me external ones which showed the same pressure changes as the internals, but temps would only rise 5-10 degrees above ambient. I assume it's hotter inside the tire than outside where it dissipates but wondering if the 158 degree warning point would be lost on an external sensor?
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I've run TST 507 external sensor for five years, about 25K miles. The temps mostly track the outside air temp, plus only a few degrees (less than ten). You can also see the influence of the heat of the sun, ten degrees is about the max when you are on the road with high speed airflow outside the sensor.
I don't think you would ever see 158 degrees. Maybe if the tire was on fire.
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06-16-2018, 12:08 PM
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#159
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Master of Universe
2008 25' Safari FB SE
Grand Junction
, Colorado
Join Date: Sep 2007
Posts: 12,711
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Quote:
Originally Posted by SSquared
I don't think you would ever see 158 degrees. Maybe if the tire was on fire.
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If you were driving through Phoenix when it is 120˚ at 70 mph, the tires facing the sun might get to 135˚. I expect that is at or over their maximum temp range. If you stop and no wind is cooling them, maybe temps would increase for a while, but 158˚ does seem unlikely.
__________________
Gene
The Airstream is sold; a 2016 Nash 24M replaced it.
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06-16-2018, 02:56 PM
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#160
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Moderator dude
1966 26' Overlander
Phoenix
, Arizona
Join Date: Apr 2002
Posts: 7,510
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If you are driving through Phoenix and it is 120 degree F ambient temperature, the asphalt can get as hot as 150 or 160 degrees F. The concrete will be 10 to 20 degrees cooler. I have no idea what the inside tire temps would be under those conditions. And my opinion is it would be hot.
>>>>>>>>>>>>>Action
__________________
1966 Mercury Park Lane 4 DR Breezeway 410 4V, C-6, 2.80 - Streamless.
1966 Lincoln 4 door Convertible 462 4V 1971 Ford LTD Convertible 429 4V Phoenix ~ Yeah it's hot however it's a dry heat!
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