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Old 04-02-2018, 04:43 PM   #21
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I spot check my and notice that the PSI tends to increase on the the inside dually tires faster than the outside. If that is the case, I can slightly reduce the pressure on those inside tires to maintain a consistent PSI across the rear axle.
Question: Has anyone in here experimented with lower tire pressures? I'm curious if they cause more flexing of the tires, and end up bringing the pressures up even faster?
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Old 04-03-2018, 04:15 PM   #22
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OK JamieGeek - the next step is to hack toad TPMS and combine.
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Old 04-04-2018, 02:35 AM   #23
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OK JamieGeek - the next step is to hack toad TPMS and combine.
Can just add external sensors to the toads tires.

In my case I was going to put 2 on the dolly's tires and 2 on the toads rear tires.
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Old 04-04-2018, 09:56 PM   #24
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my gripe with my TPMS is the digital readout.
I'm also an engineer....and I find myself getting hung up in the digits
as in dang... the inner right tire is 0.1 psig lower than the outer right tire.... and the left rear tires are 1.2 psig and 0.9psig higher.
oh the chaos.....I hate it when that happens!

Personally, I feel that an analog display would a better fit for this application.
You could dampen out that resolution a bit to a more meaningful display

Other benefits of analog instrumentation....
easier to see trends developing
you can see at a glance if things are 'good' or not, without having to see the number & then think about the number
you can doing things like green arcs, yellow arcs, red arcs....

I'm thinking a bar graph display would be awesome!
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Old 04-04-2018, 10:32 PM   #25
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my gripe with my TPMS is the digital readout.
I'm also an engineer....and I find myself getting hung up in the digits
as in dang... the inner right tire is 0.1 psig lower than the outer right tire.... and the left rear tires are 1.2 psig and 0.9psig higher.
oh the chaos.....I hate it when that happens!
Same! I obsess about the status of all the numbers as we are going down the road. I guess it keeps me busy.
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Old 04-04-2018, 11:27 PM   #26
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my gripe with my TPMS is the digital readout.
I'm also an engineer....and I find myself getting hung up in the digits
as in dang... the inner right tire is 0.1 psig lower than the outer right tire.... and the left rear tires are 1.2 psig and 0.9psig higher.
oh the chaos.....I hate it when that happens!
I'm thinking a bar graph display would be awesome!
Too much information can do funny things to you...
On my Spyder: the manual states that the front tires MUST be within .5 psi of one another...
So I just got a monitor that reads in half-pound increments!
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Old 04-05-2018, 04:50 AM   #27
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The funny thing is it doesn't read back in that high resolution--at least the ones I'm playing with. A byte each for PSI and temp. That is a range of 0 to 255. Don't have the conversions handy as I'm out of town, but I recall them jumping a bit with each bit change--especially the temperature.

Hmm analog display, have to ponder that--already have to make everything bigger so I can see it without glasses LOL
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Old 04-05-2018, 05:21 AM   #28
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For most drivers I think a warning light is the better solution, which avoids information overload and other distractions.

If pressure and temperature are within safe range then no need to view data. Once a tire deviates from normal range, then pop up a window with detail data. Obviously the geek in all of us should be able to view data at any time if desired.
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Old 04-05-2018, 12:58 PM   #29
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While I agree with you 131%: my obsessive compulsive side is now twitching uncontrollably...
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Old 04-05-2018, 01:23 PM   #30
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Trick Question

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LOL Yep -40 it is.
Is that Degrees C or F ?
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Old 04-05-2018, 01:32 PM   #31
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Is that Degrees C or F ?

Yes.
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Old 04-05-2018, 01:44 PM   #32
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Yes.
You are correct! You can have a cookie.
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Old 04-05-2018, 01:52 PM   #33
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One of Chance's many talents, is temperatures...

But what would it be in Kelvin?
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Old 04-05-2018, 01:53 PM   #34
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Is that Degrees C or F ?
Both.
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Old 04-05-2018, 02:48 PM   #35
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One of Chance's many talents, is temperatures...

But what would it be in Kelvin?
Absolutely
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Old 04-05-2018, 03:06 PM   #36
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233.15

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Old 04-05-2018, 03:18 PM   #37
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One of Chance's many talents, is temperatures...

But what would it be in Kelvin?

Going back to the original question asked by Jamie, where C and F temperature scales have same numerical value at -40, then in this case youíd be comparing the Kelvin and Rankine absolute scales.

If youíre asking where these two meet, you donít need much math. The name gives it away.
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Old 04-05-2018, 03:51 PM   #38
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For most drivers I think a warning light is the better solution, which avoids information overload and other distractions.

If pressure and temperature are within safe range then no need to view data. Once a tire deviates from normal range, then pop up a window with detail data. Obviously the geek in all of us should be able to view data at any time if desired.
The annunciator light is a very good approach. You're right about the needless distraction when all is well.

Not necessarily saying that in the case of TPMS this is true or not, BUT sometimes there is value in seeing relative data and trends, and having more information is helpful....
Is one data point way higher or lower than the others?
Are one or several of the data points in motion? (moving up or down)
that sort of thing....
Often the actual digits aren't as interesting as the big picture.

There's a company that makes aviation engine monitors
https://www.jpinstruments.com/
They started, as I recall, with instrumentation to only display temperatures of each cylinder. I see them advertised in aviation magazines all the time, and I've read several articles about them, and their displays. Apparently a lot of research and thought into showing what is important for different types of data.
I can totally imagine that a vertical bar graph display like theirs could be used very effectively for TPMS. The actual digits could still be displayed, but much less prominently. Instead with focus on relative levels and trends, perhaps with a color coded green, yellow, red to catch your eye.


I thought of one more point.... a gripe about my TST system as food for thought for your project.
When mine alarms, the display still scrolls through each tire on it's 5 second rotation. Because of that it's hard to tell which tire(s) are in alarm and what the problem actually is.
Is the tire totally flat so I need to hit the shoulder NOW?
....or just at the overpressure alarm point value because I'm driving through the desert in the summer, and all I need to do is slow down and find a safe place to pull over?
....I don't know, let's wait 30 seconds till it scrolls through all the tires and I try to keep my eye on the monitor and the road!
Not very good IMHO.
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Old 04-05-2018, 03:59 PM   #39
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Wow, this is all great discussion! Keep it going
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Old 04-05-2018, 04:38 PM   #40
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I agree!
I'd rather have too much information: than too little!
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