My favorites so far are the Rt12r-RWD and the Glickenhaus.
Release notes on 1.3
Assetto Corsa version 1.3 introduces some great improvements to the core game engine and new features to the physics engine.
The game now supports native 64-bit code. The physics engine has been reworked and is now completely multithreaded. As a result, the driving precision is augmented, the accuracy has further improved and the physics solver has enough horsepower to completely resolve any difficult calculations at any speed, achieving butter-smooth Force Feedback and a complete elimination of signal noise and vibrations.
Assetto Corsas top-class physics engine has been constantly evolving and improving. The AC physics code already includes various industry-first features, such as advanced active aerodynamics, four-wheel drive simulation with active differentials, realistic driving assists systems, unique hybrid engines simulation and advanced tyre-wear features, such as blistering, graining and flat spots.
With version 1.3 we now present you a completely reworked tyre model that includes new features in connection with tyre-speed sensitivity, combined grip, slip angles and ratios, load sensitivity, rolling resistance and most importantly, separated heating for surface and core temperatures. As a result, driving in Assetto Corsa is now more realistic than ever. The driving experience is more natural while at the same time also more challenging at the limit. Real-life features such as driving carefully in the first two laps to heat the tyres or taking it easy to cool down overheated tyres after a spin, the handling of the car changing from turn to turn depending on your driving style or as a result of driver errors and choosing the correct tyre compound depending on the track and car combination and also your driving style will now become part of your daily driving experience in Assetto Corsa.
We did not stop at the tyres though. We have improved the ABS system and now depending on the car, Assetto Corsa supports different generations of ABS systems using 1 to 4 channels. We have enabled active differentials also for RWD cars, such as the brand new BMW M4, which is part of the Dream Pack 2 DLC. We also have improved the height sensitivity of front splitters and diffusers making their influence more complex from a setup engineering point of view and more demanding from the aspect of the driver, creating an overall more satisfactory experience for everyone.
Do not just drive by memory some binary data values that resemble cars on your screen. Drive cars that are alive, constantly changing their behaviour from turn to turn as a response to your personal driving style.