gm . Does anyone know if the tires are reading cold does the ECU adjust to limit HP and TQ ?

 

No, it does not. That is just information for the driver. The car will allow you to drive as recklessly as you (or your current traction control setting) want.

 

There is nothing that says that, that I have seen. Adjustment to power/torque are done in real time to control wheel spin and stability based on real time (essentially instantaneous) measurements of wheel spin, steering wheel and brake input, and car motion. So, if "cold" tires tend to slip that will be detected and controlled (to the extent allowed by physics).

 

Nope believe that only happens with Drive Mode setting. I use Weather Mode that has slower Tip-In and more nannie intervention.
Just validated the other day! Was not my intent. Cold rainy day. Was driving in Weather Mode handled fine. Then lift a mini mall onto a 4-lane divided highway. Forgot to put it back in Weather Mode. Started in Touring. Accelerated onto the highway and *** end side out a bit. It was caught when I backed off the Throttle. My AWD E-Ray is great in the rain- in Weather Mode!

 

I was wondering the same thing. I just got my car supercharged. And recently noticed when my tires read cool it feels like it's pulling timing after shifting up to the next gear, and I didn't notice that when the tires were normal.

 

I searched the 2020 Service Manual for "tire temperature" and found nothing that said the car will change behavior because of a low or high tire temperature.

The car probably does change behavior until the engine and oil are up to temperature.

Also, there are features that are not described in the manual. There was a thread about someone doing sustained high speed driving (not to be confused with tracking) and was experiencing a loss in top speed. I think it was Harlan that got involved. Turned out he had a track fill (and should not have because he was not tracking) and because of the extra fluid, there was some temperature sensor in the transmission that was getting constantly sprayed with fluid (this is all from what Harlan told him) in sixth gear - this caused an "erroneous" over temp from that sensor which led to the slowdown, even though the average temperature of the fluid was just fine. He was advised to remove the track fill, and that resolved the issue. My point though, is that its an example of feature that slows the car thats not really explained in the manual. As far as I know, there was no DTC set and no indication of overtemp. So it was sort of a hidden feature.

 

I agree. I think something like what I'm experiencing would not be in the manual. It could also be from my tuner.

 

If I recall, it was mentioned at thetime of C7's introduction that e-diff behavior changes per tire temp info. When it's cold, I presume it would lock more than usual, adding to understeer while increasing safety of the car's driving dynamics. Not sure if it does, but I'd not be surprised at all.

 

I do not know if the car uses tire temperature directly to adjust powertrain parameters, as there is nothing about that in the Owner's Manual or the 2020 Service Manual.

But we do know this. Regardless of tire temperature, tire traction is still affected by road surface conditions. And we know that the car has Electronic Stability Control, and Traction Control System. There are sensors in the car that detect and prevent, as much as possible, loss of control (skids, slides, etc.) and wheel spin. It works so quickly that driver may never sense the slide or wheel spin, but instead just detects a slight reduction in power or maybe a "course correction". My point is that if the cold tires tend to slip more, the car will detect and correct for it even if it does not directly use tire temperature and the driver will feel these corrections. My guess is that surface conditions can affect tire traction as much or more than tire temperature.