Subject: Inconsistency between Core and Carcass temperatures and linear heat generation based on velocity.
1. Executive Summary
After extensive testing in different climates (Interlagos/Brazil - Hot and Las Vegas - Cold), we have identified a significant flaw in the tire physics engine. The current model implements a "Hard-Coded" heat generation for the Tire Core based almost exclusively on velocity (Rolling Resistance), while failing to simulate realistic Thermal Conductivity between the Tire Core and the Carcass/Surface.
2. Test Methodology & Data
We isolated variables by using a "frozen" setup (Max suspension stiffness, Max tire pressure, Zero Camber/Toe) to eliminate mechanical deformation heat.
Case A: Interlagos, Brazil (High Ambient Temp)
Condition: Straight-line speed at 320+ km/h.
Result: Core Temp stabilized at 106°C - 107°C.
Observation: Changes in Aerodynamic Load (Wing 0 vs. Wing 20) and Suspension stiffness resulted in less than a 1°C variance, proving the heat is velocity-dependent, not load-dependent.
Case B: Las Vegas (Low Ambient Temp)
Condition: Long straight (The Strip) at 320+ km/h.
Result: Core Temp reached 95°C, while the Carcass/Surface Temp dropped to 45°C.
The "5th Gear" Anomaly: When limiting speed to 248 km/h (5th gear) on the same straight, the Core Temp dropped to 82°C.
3. Technical Diagnosis (The Physics Bug)
A. Broken Thermal Conductivity (CoreToSurface)
The most alarming data point is the 60°C delta between the Carcass (45°C) and the Core (105°C) in Las Vegas. In a realistic physical model, the cold airflow at 320 km/h should cool the surface, which in turn should "sink" heat from the core.
The Issue: The ThermalConductivity coefficient in the tyres.xml files is likely set too low, creating a "thermal bottle" effect where the core is insulated from the external environment.
B. Overtuned Rolling Resistance (RRCoeff)
The Core temperature is behaving like a linear function of RPM/Velocity rather than a result of physical stress.
The Issue: The RollingResistanceHeat parameter is tuned too high for Formula 1 speeds. It generates heat faster than the ConvectionCoeff (air cooling) can dissipate it, leading to a "thermal tax" for simply driving fast in a straight line, regardless of track temperature or setup.
4. Proposed Solutions for Dev Team
Recalibrate InternalToAmbient / CoreToSurface: Increase the rate at which the Tire Core transfers heat to the Surface. This will allow the cold air in tracks like Vegas to actually cool the tire core.
Balance RollingResistanceHeat vs. ConvectionCoeff: Reduce the heat generated by pure rolling and increase the cooling efficiency of the airflow at high speeds (300+ km/h).
Dynamic Load Scaling: Make the core temperature more sensitive to VerticalLoad and CarcassDeformation rather than a fixed velocity script.