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I think he is talking about the engine? At what temperature is it unsafe to full throttle? (provided the car and components are warmed up).
Chevy should have done a great job programming the PCM on these cars, and if its like any other car they build, the tune will be significantly rich to protect the engine in many conditions, and this being one. If you car is running a stock tune, you are mostly safe to WOT until around -40C (-40F). Then the coldness of the air (possibly) could start having an effect the tune cannot count for.
If anybody has an aftermarket tune though... its a much different story. Those tunes always lean out the engine, and so the only way to tell a safe temp to WOT is to talk with your tuner.
And like it has been stated, the stock Pirelli tires performance falls off badly below the 5C (45F) temp.
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