Tire Pressure Monitoring System

[thomas phipps]

Installing a TPMS on the coach and Towd. Since this system will handle 22 sensors, it occurred to me that you could install 2 additional sensors on
the air bags. Wools give you some warning of loss of air pressure or failure. Handy for those who have Schrader valves on their coach.
This is mainly in response to a total tire failure on the towed vehicle. Rim hit something on highway and major failure. Turned into a very wild goose
chase. Honda Fit uses an unusual tire size. Difficult to find in rural AL. Dealer ended up being the only rapid source, and he only had four.
Tom, MS II
--
1975 GMC Avion
KA4CSG

 

[johnny]

I trashed a mag wheel on the ratrod toad when a tire let go. Hunnert bux for another, plus two front tires. TPS would of saved the wheel, maybe the
tire also.

--johnny
--
'76 23' transmode Norris upfit, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
"The road goes on forever, and the party never ends" --Robert Earl Keen

 

[robert mueller]

Tom,

GREAT idea! It would be interesting if you could log the pressures somehow
as I'd like to see how it is affected by road conditions.

Regards,
Rob M.
The Pedantic Mechanic
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808

-----Original Message-----
From: Gmclist [mailto:gmclist-bounces] On Behalf Of Thomas
Phipps
Sent: Sunday, January 22, 2017 3:24 AM
To: gmclist
Subject: [GMCnet] Tire Pressure Monitoring System

Installing a TPMS on the coach and Towd. Since this system will handle 22
sensors, it occurred to me that you could install 2 additional sensors on
the air bags. Wools give you some warning of loss of air pressure or
failure. Handy for those who have Schrader valves on their coach.
This is mainly in response to a total tire failure on the towed vehicle. Rim
hit something on highway and major failure. Turned into a very wild goose
chase. Honda Fit uses an unusual tire size. Difficult to find in rural AL.
Dealer ended up being the only rapid source, and he only had four.
Tom, MS II

 

[thomas phipps]

Rob, Unfortunately, TPMS really only reports 20% over pressure alarm, 10% under pressure alarm, and tire high temperature alarm.
I think some very interesting points could be monitored, especially over time and terrain. I'm not sure what the average guy could do with the data.
As electronics continue down the curve in size and cost, and up the capability curve, very interesting recording capabilities could be developed.
Tom, MSII
--
1975 GMC Avion
KA4CSG

 

[david shafer]

I put a good TPS system on my coach soon after I got it because I did not want to buy tires until I had it sorted out. It is interesting to note
pressure and temperature fluctuations. The sun causes more difference in temps than I thought it would... even when driving. However tread separation
does NOT give one much if any temperature or air pressure warnings. I had my pressure warning set pretty tight when mine blew. The alarm sounded the
same time as the coach pulled a bit left and the tread took out my "T" skirt. Temperature fluctuations vary too widely to offer much advance notice in
such a case.
--
1977 26 foot 403

 

[kingsley coach]

I used nitrogen in my tires until this last set when I did not.
I wonder if the temps would have been more stable in your case had you been
using nitrogen ??

Mike in NS

On Sun, Jan 22, 2017 at 9:36 AM, David Shafer
wrote:

> I put a good TPS system on my coach soon after I got it because I did not
> want to buy tires until I had it sorted out. It is interesting to note
> pressure and temperature fluctuations. The sun causes more difference in
> temps than I thought it would... even when driving. However tread separation
> does NOT give one much if any temperature or air pressure warnings. I had
> my pressure warning set pretty tight when mine blew. The alarm sounded the
> same time as the coach pulled a bit left and the tread took out my "T"
> skirt. Temperature fluctuations vary too widely to offer much advance
> notice in
> such a case.
> --
> 1977 26 foot 403
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

--
Michael Beaton
1977 Kingsley 26-11
1977 Eleganza II 26-3
Antigonish, NS

Life is too short to hold a grudge; slash some tires and call it even !

 

[david shafer]

Interesting thought about nitrogen. I don't know, however I don't consider the reported temps "unstable". They varied by sunlight, brake drag, heavy
braking, and probably speed, bearing fit and other factors as one would expect. My system reported temps but IIRC only had an alarm for high temp.
There may have been some temp increase before the separation but not enough to trigger the alarm. The reports sequence from tire to tire... dangerous
to monitor too closely while driving. As someone stated earlier there will improvements in the future... probably be a system that monitors trends in
pressure and temp that may be more helpful. I am glad I have mine and believe it will be a good tool to monitor pressures, bearings and brakes. I will
couple it with good tires though.
--
1977 26 foot 403

 

[Ken H.]

David,

My experience with tire temperature vs tread separation has been similar to
yours. When I first bought an IR temperature gauge I was pretty religious
about checking temperatures at each stop. Entering Indianapolis on the
interstate, I stopped for gas and checked temperatures; all normal and
nearly identical. About 5 miles later, nearing the other side of town, I
felt the distinctive bumping of approaching tread separation. Spotting a
tire store, I stopped and sure 'nuff, one of my nearly-new Firestones was
about to shred.

I've been less conscientious about using the IR gun since then.

Ken H.

On Sun, Jan 22, 2017 at 9:31 AM, David Shafer
wrote:

> ​...
>
> There may have been some temp increase before the separation but not
> enough to trigger the alarm.
> ​
>
...
>

 

[thomas phipps]

Ordinary air is 94% nitrogen. I believe road surface temperatures and friction are bigger contributors to tire temperatures.
Tom, MS II
--
1975 GMC Avion
KA4CSG

 

[a.]

> Ordinary air is 94% nitrogen. I believe road surface temperatures and friction are bigger contributors to tire temperatures.
> Tom, MS II
Less than 80% nitrogen. About 20% oxygen.
--
73 23' Sequoia 4 Sale
73 23' CanyonLands Parts Unit 4 Sale
Upper Alabama
"Highest price does not guarantee highest quality."

 

[emerystora]

By volume, dry air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1% at sea level, and 0.4% over the entire atmosphere.

By weight the oxygen goes up to about 23.2%.

Either way, the use of pure nitrogen is not going to make much, if any, difference in the tires running temperature. The theory actually is that by using nitrogen one will keep oxygen away from the rubber inside the tire so it will not degrade the rubber. That overlooks the fact that the outside of the tire has continuous exposure to oxygen.

Then there are those who feel we should use helium in the tires so our motorhomes will float down the highway.

Emery Stora
77 Kingsley
Frederick, CO

>

>> Ordinary air is 94% nitrogen. I believe road surface temperatures and friction are bigger contributors to tire temperatures.
>> Tom, MS II
> Less than 80% nitrogen. About 20% oxygen.
> --
> 73 23' Sequoia 4 Sale
> 73 23' CanyonLands Parts Unit 4 Sale
> Upper Alabama
> "Highest price does not guarantee highest quality."
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

 

[Ken B]

I was sold on using nitrogen in my tires years ago. I have been using 78% nitrogen, 20% oxygen, and 1% water ever since. I also have never had a
problem finding it.
--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana

 

[d c *mac* macdonald]

HAR, HAR, HAR!

Otherwise known as compressed ambient air!

~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
~~ ~ D C "Mac" Macdonald ~ ~~
~ ~ Amateur Radio - K2GKK ~ ~
~ ~ Since 30 November '53 ~ ~
~ ~ USAF and FAA, Retired ~ ~
~ Member GMCMI and Classics ~
~ ~ ~ Oklahoma City, OK ~ ~ ~
~~ ~ ~ "The Money Pit" ~ ~ ~~
~ ~ ~ ~ TZE166V101966 ~ ~ ~ ~
~ ~ ~ '76 ex-Palm Beach ~ ~ ~
~~ k2gkk + hotmail dot com ~~
~ www.gmcmhphotos.com/okclb ~
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
______________
|[ ]~~~[][ ][]\
"--OO--[]---O-"

________________________________
From: Gmclist on behalf of Ken Burton
Sent: Sunday, January 22, 2017 10:49
To: gmclist
Subject: Re: [GMCnet] Tire Pressure Monitoring System

I was sold on using nitrogen in my tires years ago. I have been using 78% nitrogen, 20% oxygen, and 1% water ever since. I also have never had a
problem finding it.
--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana

_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

Gmclist Info Page - list.gmcnet.orghttp://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
list.gmcnet.org
To see the collection of prior postings to the list, visit the Gmclist Archives. Using Gmclist: To post a message to all the list members, send email ...

 

[robert mueller]

IIRC nitrogen is used in racing vehicles because there is no water vapor in
it which can affect the tire pressure when the tire temps change and effect
the vehicles handling at high speed.

Here's Popular Mechanics take:

http://www.popularmechanics.com/cars/how-to/a3894/4302788/

Regards,
Rob M.
The Pedantic Mechanic
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808


-----Original Message-----
From: Ken Burton

I was sold on using nitrogen in my tires years ago. I have been using 78%
nitrogen, 20% oxygen, and 1% water ever since. I also have never had a
problem finding it.
--
Ken Burton