Does anyone understand the relationship between grip level and track temp?

CobraCat

500RPM
Jun 7, 2016
855
490
For example if I set the grip level in AC to 97% then set the ambient temp to 15.8C which results in a track temp of 21.7C, how does this affect the over all grip level ?
 

Stereo

3000RPM
Premium
Dec 22, 2009
3,352
3,271
Grip level of 97% just means there's that much less grip for everything, track temperature doesn't change grip at all, only the temperature of tires driving on it. (which can put it outside of the ideal range, or not matter). Probably never going to be as much as 3%, more in the 0-0.5% range for the difference from ambient 10C to 30C
 
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Cussco

50RPM
Premium
Jan 1, 2015
64
28
48
If the air temp is low the cars have slightly more power i swear. GT86 at spa with air temp below 10 degrees the lap time is quicker by almost a second (2.57-8s). Just need to increase psi a bit to compensate for the lower air and track temp.
 

Terry Rock

2000RPM
Oct 24, 2009
2,261
1,021
15 degrees is considered 'standard day' temperature.
You'd need a few more pieces of information....what compound (soft, medium or hard)...what track' surface (asphalt or concrete)...elevation, density altitude, etc.
It can get rather complex based on those parameters.
When the surface of the rubber gets too hot, it will blister...think of it as taking a torch and passing it over rubber.
The surface becomes more of a plastic-like form and has less grip.
Shearing from abrasion is quite different.
It forms minute stretches of the rubber or 'graining'....again less grip due to lower boundary contact.
If it not too severe, graining can be 'cleaned' up as the rubber 're-flows'.
Unlike graining, blisters will usually get worst... sometimes resulting in carcass delamination.
 
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Andy-R

1000RPM
Jul 23, 2016
1,153
900
If the air temp is low the cars have slightly more power i swear. GT86 at spa with air temp below 10 degrees the lap time is quicker by almost a second (2.57-8s). Just need to increase psi a bit to compensate for the lower air and track temp.
Yep, lower ambient gives you extra horse.