[spoiler=О шинной модели РФ2]There are many aspects of physics improvements in rFactor 2. Such as the engine model updated, a more generic chassis/suspension system (so one can properly mount springs on A-arms, for example, or may model chassis flex, etc), and then there is Real Road which builds up rubber around the track based on where people actually drive (and similarly dries up rain):
https://www.youtube.com/watch?v=_GmgL...
However, the biggest improvement in rF2 is the Tire modeling. In rF2, the original physical tire model has been incorporated with a Thermodynamic model.
This highly complex and nonlinear modeling requires in depth knowledge of the geometry, material properties, friction coefficients, dissipation mechanisms, convective heat transfer coefficients, and many other aspects of tire design. With some real field data and experiments by ISI, they came up an approach on finite-element solution to model thousands points on tire's surface contact area. The temperature distribution of tire contact area is calculated under all imaginable conditions. The results then are indexed to a large lookup table. The rF2 core updates a result from tire look-up table at very high rate ~360Hz. It updates almost in real-time given by a condition at any point of time. Each point on surface of the tire represents a rubber element contains itself thermodynamic properties and as result in affecting the grip properties. As little rubber elements roll in (tire spins), they grip and/or slide across the road. In this sense the original concept of "slip angle" is no longer needed as an attribute in the model. The "dynamics of slip angle" is reflected by a result of all the rubber elements' dynamics. Hence, this model physically responds to movement naturally. The force feedback becomes much more accurate and natural too. That shall give more realistic handling feel on the steering wheel, weight transferring,a car dynamic movement.