The engine was upgraded from 333Hz to 400Hz, providing 20% more data points for tire and ground collision detection. This makes curb strikes and high-speed tire oscillations significantly more detailed.
To understand the "deep content" of v1.8.18, one must consider the physics engine it rests upon, which was completely transformed in the 1.8 cycle: Assetto Corsa Competizione [v1.8.18]
Adjustments were made to level the playing field across several GT3 models. The Aston Martin Vantage V8 GT3 received improvements to its pace, while the BMW M4 GT3 and Audi R8 LMS GT3 EVO2 were tuned to be slightly slower. The engine was upgraded from 333Hz to 400Hz,
Subsequent updates under the same version number addressed sporadic desktop crashes (exception code 0xc0000374 ) and increased the online protocol version for better multiplayer compatibility. The Core v1.8 Foundation The Aston Martin Vantage V8 GT3 received improvements
Revised wet track limits were implemented across various circuits to prevent unintended advantages during rainy sessions.
Deep dive into the v1.8.18 update and the massive v1.8 physics overhaul that defines it: