Tire Temperature Display
Drifting
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From: Dallas TX
Racer
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Damned right. There was thread published about a week ago at a track outing showing a white C7 that piled into a tire wall on a cool morning, and I suspect that gauge was showing tires "warm."
Last edited by Foosh; Oct 11, 2017 at 05:02 PM.
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St. Jude Donor '13
I just got back from a 1700 mile trip through the Rockies. One morning leaving Dillon it was 26 degrees. At start up, tires read Warm. Drove a bit and it never changed. I have seen Hot before, so it's reading something. I too found it odd that they never got Cold.
So it's not just you, Jim...
So it's not just you, Jim...
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From: DFW Area TX
With the conditions described in my original post, I can't see how my tires could have been above 46'.
A Z06 in our group also said his tires indicated "Warm" immediately after starting, on another day when the temperature was below 40' after parking outside overnight.
Somethin' strange about the system...
A Z06 in our group also said his tires indicated "Warm" immediately after starting, on another day when the temperature was below 40' after parking outside overnight.
Somethin' strange about the system...
I do know that the display does show Cold and others have posted it displaying Frozen.
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St. Jude Donor '13
We've already discussed that the system does not actually measure the tire temperature. There are a lot of factors that would affect those temps. The ambient air temperature is only one factor. I imagine the ground is still much warmer than the ambient air temperature was. The tires are sitting on that warm ground getting warmed by it. I'm also guessing that you drove the car prior to parking it and that would have elevated the tire/wheel temperatures. The temperature sensor is inside the TPM sensor which is inside the tire. That a lot of mass to cool off and the air temperature (36) just isn't cold enough to offset the ground heat and existing tire wheel heat. How long was the air temp below 46 degrees? What was the air temp when you parked it? What were the tire temps when you parked it? How hot were your brakes? Just too many variables that we don't know.
I do know that the display does show Cold and others have posted it displaying Frozen.
I do know that the display does show Cold and others have posted it displaying Frozen.
On our C5 and C6, I would sometimes check the coolant, oil, and transmission temps, immediately after startup from overnight parking in our unheated garage; and then compare them with the two thermometers on the wall inside the garage. All of the temps would be identical within +/- 2'F.
I have a "laser" thermometer, I should compare the tire temps and air temps a few times during the winter and post the results here.
Somebody remind me if I forget to do it.
Racer
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From: Chicago IL
I always keep my display on the 4 wheel PSI. You can tell when your tires are warm, because when cold, the pressure is low. So if you air up to correct pressure when the tires are warm, if the car sits in the cold (below 32 degrees), when you start it the pressure will read low, 28-29 PSI. When the pressure comes up to 30 PSI your tires are warm.
Sly
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From: Far NW 'burbs of Chicago
St. Jude Donor '13
10-26-2017
Tire temperature with laser thermometer 44'
Dash readout: "Warm"
11-06-2017
Tire temperature with laser thermometer 32'
Dash readout: "Warm"
11-08-2017
Tire Temperature with laser thermometer 28'
Car outside temp 34'
Dash readout: "Warm"
11-1--2017
Tire temperature with laser thermometer: 19
Dash readout: "Warm"
Since DanZR1 posted a similar experience, mine may be working as designed.
I wonder if there are different calibrations for the different models of C7 and their different tires? Ours is a 2017 Z51.
Last edited by Gearhead Jim; Nov 10, 2017 at 11:09 AM.
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No, both temp and pressure are read. See Zymurgy's chart. The problem is "warm" does not mean warm, and as others have demonstrated in this thread, it can actually mean you still have cold tires.
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St. Jude Donor '13
Post # 30 just updated again.
I can't see how 19'F qualifies as "Warm" anywhere except in Antarctica.
It's actually below the temperature at which GM tells us not to move the car at all, or the summer tires may crack. I've got AS tires on the car now but neither the sensors nor the car computer knows that.
I can't see how 19'F qualifies as "Warm" anywhere except in Antarctica.
It's actually below the temperature at which GM tells us not to move the car at all, or the summer tires may crack. I've got AS tires on the car now but neither the sensors nor the car computer knows that.
Racer
Joined: Feb 2001
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From: Henderson NV
Jim, have you tried driving the car? I wonder if the sensors have to update, like the ambient air temp sensor does? FWIW, it didn't work for me in Dillon, but I had driven a bit before I rechecked, so in they they could have warmed up...
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St. Jude Donor '13
Thanks for asking.
Melting Slicks
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Some info here on tire temp categories.
Start video at 4:00
http://www.autoline.tv/daily/?p=29850&cpage=1
Start video at 4:00
http://www.autoline.tv/daily/?p=29850&cpage=1
Thread Starter
Team Owner
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From: Far NW 'burbs of Chicago
St. Jude Donor '13
Some info here on tire temp categories.
Start video at 4:00
http://www.autoline.tv/daily/?p=29850&cpage=1
Start video at 4:00
http://www.autoline.tv/daily/?p=29850&cpage=1
But if my ABS/TC/AH think my tires are "Warm" when they are actually 19'F, that could lead to some nasty surprises.
Thread Starter
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From: Far NW 'burbs of Chicago
St. Jude Donor '13
Problem Solved!
I noticed that our 2017 had occasional weird electrical glitches- showed me twice as "Driver #3" with no #3 fob, the tire temperature issue, the CTEK charger would sometimes temporarily lose its connection in the rear plug even though firmly plugged in, etc. Just the usual Corvette electrical problems, right? Hmmm...
Two days ago I took a guess and unplugged the Valentine "Savvy" unit from the OBD port. The Savvy powers the detector when the car is running and reads the car speed so it can mute warnings below whatever speed I set. It does not "tell" the car anything, it just "listens".
Voila!
Today I started the car at 37' temp, the tires said "Cold" but transitioned to Warm" after about 6 miles of driving. And the charger has been working properly for these two days.
Now, to find a better detector setup...
Thanks for all your comments.
I noticed that our 2017 had occasional weird electrical glitches- showed me twice as "Driver #3" with no #3 fob, the tire temperature issue, the CTEK charger would sometimes temporarily lose its connection in the rear plug even though firmly plugged in, etc. Just the usual Corvette electrical problems, right? Hmmm...
Two days ago I took a guess and unplugged the Valentine "Savvy" unit from the OBD port. The Savvy powers the detector when the car is running and reads the car speed so it can mute warnings below whatever speed I set. It does not "tell" the car anything, it just "listens".
Voila!
Today I started the car at 37' temp, the tires said "Cold" but transitioned to Warm" after about 6 miles of driving. And the charger has been working properly for these two days.
Now, to find a better detector setup...
Thanks for all your comments.
Racer
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From: Henderson NV
Interesting, but doesn't explain mine reading Warm when I was in Colorado. (Un)fortunately, it seldom gets below 40 here for very long, and never in my garage. If I ever find myself parked overnight somewhere cold, I'll double check...
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From: Far NW 'burbs of Chicago
St. Jude Donor '13
Seriously, if yours ever acts up again, please post.
BTW, a local friend had intermittent TPMS problems with his C6 just because of a phone charger plugged in.