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09-23-2017, 08:11 AM
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#15
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Senior Member
Monaco Owners Club
Join Date: May 2012
Location: DFW, Tex-US
Posts: 6,196
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As stated, don't make it rocket science... or trigonometry or boundary layer flow theorem (2nd year Chem E course ) either
before you leave measure all your tires and if you need + 3 lbs in one tire, + 5 in another, make a note of it and drive to the station and add 3 lbs and 5 lbs to whatever the same tire measures when you get to the shop... easy peazy !
Will it be exact ? no, but it will do until the next cold check, this method has worked for me for the last 30 years or so
__________________
'11 Monaco Diplomat 43DFT RR10R pushed by a '14 Jeep Wrangler JKU. History.. 5'ers: 13 Redwood 38gk(junk!), 11 MVP Destiny, Open Range TT, Winn LeSharo, C's, popups, vans, tents...
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09-23-2017, 08:25 AM
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#16
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Senior Member
Ford Super Duty Owner
Join Date: Dec 2010
Posts: 1,799
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Quote:
Originally Posted by JohnBoyToo
As stated, don't make it rocket science...Will it be exact ? no, but it will do until the next cold check, this method has worked for me for the last 30 years or so
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X2! A few pounds of "cooler" air won't kill anything. No the TPMS isn't exact, but once you have an idea of measured vs TPMS it will all be pretty close. Many truckers just hit the tire with a hammer to see if it is "OK."
__________________
Scott Brownstein
Palm Island, Florida
2015 Georgetown 335DS
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09-23-2017, 08:31 AM
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#17
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Senior Member
Winnebago Owners Club Freightliner Owners Club
Join Date: Jun 2013
Location: 5 miles south of Lakeville, Mn
Posts: 3,047
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I drove all across southern Texas one winter trying to find a place to air up my low front tire. Finally purchased a pancake compressor that goes up to 150 psi. Glad I did.
__________________
Jim and Carol Cooper with Oreo the Kitty
FAA ATC ret, VFW, AL, VVA, NRA
US Army Aviation, MACV Vietnam 65-66
2012 Journey 36M, Cummings 360hp
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09-23-2017, 09:53 AM
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#18
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Member
Winnebago Owners Club
Join Date: Apr 2012
Location: Western US
Posts: 58
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You're right of course but, again it's not rocket science. Some guesstimating is necessary until you can do a cold check but it's better than running 20 lbs under
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09-24-2017, 08:14 AM
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#19
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Senior Member
Join Date: Dec 2013
Location: MA
Posts: 279
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Many thanks to all for your kind advice. We fueled up at the Love truck stop and there was an air hose right at the pump as we were informed by a member here.
Now the odd part is that DH used the supposedly very good air gauge that we bought at Lazy Days along with our TPMS system. The Tpms and the gauge do not agree. Yesterday on our way to Capitol Reef NP we stopped at an auto parts store. There we bought what is called a master air gauge as a tire breaker. This new one cost $27. The one we bought with the Tpms system was supposedly $50 but we were given it for "half" price. We will be using it today before we leave when all the tires are cold to see what it says. Will let you all know how it comes out.
Michele and Mark
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09-24-2017, 08:30 AM
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#20
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Senior Member
Join Date: May 2013
Location: Ontario, California
Posts: 2,429
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Rarely if ever is compressed air hotter than the air in a tire that has traveled 3 or 4 hundred miles. An exception "may" be a direct drive compressor, (one with no storage tank) but air cools very fast (if you don't believe that, check with people who witnessed the total eclipse on August 21st.) They'll tell you about the temp drop when the sun was covered
__________________
[SIGPIC][/SIGPIC]2016 Newmar Dutch Star 4369
Newmar Owners Club
USAF 1966-1969,- Law Enforcement 1969 - 2003, Retired since March 2003
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09-24-2017, 10:57 AM
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#21
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Senior Member
Join Date: Aug 2004
Location: Wherever we are
Posts: 4,287
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M2D,
Don't get too worked up over TPMS readings vs gauge readings--what you really are looking for is consistency across all tires and trends of PSI/Temp as you travel. If you have a 'good quality' gauge, do all the tires once when cold using the gauge, then see what your monitor says they are. Now you know what the TPMS reports vs the gauge and you can relax and watch the monitor for trends as you travel.
__________________
'16 40QBH Phaeton
'21 Sahara HA toad
'15 38RSSA Mobile Suites--traded
'05 36TK3 Mobile Suites--retired but not forgotten
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09-24-2017, 12:49 PM
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#22
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Senior Member
Join Date: May 2017
Posts: 1,975
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Quote:
Originally Posted by KenD
You're right of course but, again it's not rocket science. Some guesstimating is necessary until you can do a cold check but it's better than running 20 lbs under
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+1
I compare apples to apples and match the others in a pinch. Rarely can you get a high volume of cold air in there quickly enough to make a difference. Way worse to be low than to over engineer adding air when needed.
And some food for thought. Let’s say you have a tire that runs a little warmer due to load balancing. Is it better to balance pressures when that tire is hot or cold?
Just like oil...when it’s low and you don’t have any of what is in there...some is better than none. Put in whatever you can find try to keep the same weight. And yes you can combine syn and Dino oil. Let the flaming begin...but before you start keep in mind that I’ve run and maintained engines
that redline at 14,000 rpm and run happiest around 11,000rpm. The clutch is also bathed in the same engine oil. It also only holds a few qts.
__________________
2004 Winnebago Adventurer 38R
Proud Navy Mom
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09-24-2017, 01:04 PM
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#23
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Senior Member
Winnebago Owners Club Freightliner Owners Club
Join Date: Jun 2013
Location: 5 miles south of Lakeville, Mn
Posts: 3,047
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Quote:
Originally Posted by wingnut60
M2D,
Don't get too worked up over TPMS readings vs gauge readings--what you really are looking for is consistency across all tires and trends of PSI/Temp as you travel. If you have a 'good quality' gauge, do all the tires once when cold using the gauge, then see what your monitor says they are. Now you know what the TPMS reports vs the gauge and you can relax and watch the monitor for trends as you travel.
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What wingnut said:
__________________
Jim and Carol Cooper with Oreo the Kitty
FAA ATC ret, VFW, AL, VVA, NRA
US Army Aviation, MACV Vietnam 65-66
2012 Journey 36M, Cummings 360hp
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09-24-2017, 01:36 PM
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#24
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Senior Member
Commercial Member
Join Date: Mar 2010
Location: Akron, Ohio
Posts: 2,783
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Quote:
Originally Posted by drdarrin
I have used them but you generally have to pull over to the shop, not the fuel island. And what real good would they do you except in an emergency? Your tires will be warm by the time you get there and the pressures will be inaccurate.
We carry a small pancake compressor with hose and the needed tools. We check and fill as needed before we hit the road.
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RE Hot inflation pressure. You are correct that inflating at the truck stop could leave you with incorrect Cold Inflation pressure but there are a couple ways around that problem.
You could read this post on how to adjust inflation.
The other thing to do is to note how much air you need to add and using the readings from your TPMS to simply add the number of psi you know you need to the hot inflation pressure reading.
__________________
Retired Design & Quality Tire Eng. 40+ years experience. Recognized in the industry and in court as an expert in failed tire inspection as I have performed thousands of failed tire "autopsies".
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09-24-2017, 01:40 PM
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#25
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Senior Member
Join Date: Nov 2015
Posts: 773
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Quote:
Originally Posted by Tireman9
RE Hot inflation pressure. You are correct that inflating at the truck stop could leave you with incorrect Cold Inflation pressure but there are a couple ways around that problem.
You could read this post on how to adjust inflation.
The other thing to do is to note how much air you need to add and using the readings from your TPMS to simply add the number of psi you know you need to the hot inflation pressure reading.
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Not bad advice but it really doesn't apply to my situation. I carry a compressor, check pressures cold and don't have a TPMS.
__________________
2012 Dodge C3500 DRW 4x4 Long Box, WeatherGuard 90 Gal transfer tank, B&W Companion Hitch
2012 Keystone Montana 3100RL, 520W Solar, 460AH batteries, Morningstar MPPT 45 CC, Bogart 2030RV monitor.
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09-27-2017, 07:24 PM
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#26
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Senior Member
Join Date: Feb 2008
Posts: 265
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Quote:
Originally Posted by LJowdy
Rarely if ever is compressed air hotter than the air in a tire that has traveled 3 or 4 hundred miles. An exception "may" be a direct drive compressor, (one with no storage tank) but air cools very fast (if you don't believe that, check with people who witnessed the total eclipse on August 21st.) They'll tell you about the temp drop when the sun was covered
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Compressed air is actually pretty warm. Put your hand on an air compressor (or even a simple bicycle tire pump) that has been running a few minutes to confirm that. But, be careful because you could get a burn.
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09-28-2017, 07:03 AM
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#27
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Senior Member
Join Date: May 2013
Location: Ontario, California
Posts: 2,429
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I didn't say that compressed air wasn't warm I said "Rarely if ever is compressed air hotter than the air in a tire that has traveled 3 or 4 hundred miles."
__________________
[SIGPIC][/SIGPIC]2016 Newmar Dutch Star 4369
Newmar Owners Club
USAF 1966-1969,- Law Enforcement 1969 - 2003, Retired since March 2003
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09-30-2017, 11:04 AM
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#28
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Senior Member
Commercial Member
Join Date: Mar 2010
Location: Akron, Ohio
Posts: 2,783
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Quote:
Originally Posted by M2D
Many thanks to all for your kind advice. We fueled up at the Love truck stop and there was an air hose right at the pump as we were informed by a member here.
Now the odd part is that DH used the supposedly very good air gauge that we bought at Lazy Days along with our TPMS system. The Tpms and the gauge do not agree. Yesterday on our way to Capitol Reef NP we stopped at an auto parts store. There we bought what is called a master air gauge as a tire breaker. This new one cost $27. The one we bought with the Tpms system was supposedly $50 but we were given it for "half" price. We will be using it today before we leave when all the tires are cold to see what it says. Will let you all know how it comes out.
Michele and Mark
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You might want to review my blog post on Accuracy.
__________________
Retired Design & Quality Tire Eng. 40+ years experience. Recognized in the industry and in court as an expert in failed tire inspection as I have performed thousands of failed tire "autopsies".
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