RussC243

Hi,
I read many threads on the subject and learned many people always see WARM as I do and summer tires have low traction and can crack in very low temperatures. I could not answer these basic questions:

-What are the temperatures that the system detects frozen/cold/warm/hot ? If GM never released this info I guess we must go on user experience.
-How accurate are these measurements ?
-Are the temperature sensors in the same sensor as the pressure sensors ?

The car is a 17 Z06 if that matters. I would have guessed sitting all day at 35F would be considered COLD but the display still said WARM.

Thanks,
Russ

rmorin1249

Very good question. I am running AS Contis and I remember last winter I took a drive in 10 degree weather. It took at least 10 miles of highway driving before my display said the tires were "Warm". It would be interesting to know if the TPMS sensors can also measure temperature but I doubt it.

Maxpowers

I'm curious about this as well. I speculate they do. When I park in my warm garage and drive in cool temps it always reads as "warm". In the same temps if I park my car outside it reads "cold" and then transitions to "warm" after driving for a bit.

pickleseimer

FWIW, I've read information that seems to imply it is a somewhat extrapolated value. A while ago it was posted here (I believe here but can't find it with a quick look) it begins with the current OAT, whether the tires are rolling, how long the car has been started, miles travelled since start and so on. The computed values are then summarized for display into the cold, warm and hot categories. Seems I recall that the lower end of the warm category started around 45 degrees or so. The whole feeling of the discussion was that it was far more general than specific. Kind of reminds me of the 'Horsepower' pocket gauge.

On the other hand I've seen specific temperature values by taking files from my PDR and processing them through the free Cosworth ToolBox software. So somehow the telemetry, whether computed or a direct value from a TPMS sensor which I also doubt, makes it through to the PDR files.

I know, doesn't answer the question.

pickleseimer

Well, this piqued my interest and I looked a little more. Here is a post from the 'other' forum which contains an item of information from a second source.

"Chevy uses the tire temperature data available through the C7's tire pressure sensors to more carefully control its ABS and electronic differential. Because the pressure sensors don't measure tire temperature directly (they actually measure the temperature of the TPMS sensor's microprocessor), it's not a perfect science, but it is one that data modeling can largely overcome. And it's one more piece of information that can be utilized to enhance the driving experience.

Tire temps are split into three categories: cold (below 45 degrees), warm (45-115 degrees) and hot (above 115 degrees). In "cold" mode ABS intervenes sooner and more progressively, while the differential is more aggressive to limit inside wheelspin. As temps increase, ABS control intervenes later and becomes more lenient, while differential locking ramps up more slowly."

2014 Chevrolet Corvette: Seven Things You Don't Know About the C7 on Edmunds.com

Vetteman Jack

Interesting info so far - maybe this could be an Ask Tadge question.

Woodson