Is iRacing more realistic than ACC?
After extensively testing and researching both simulations, I believe Assetto Corsa Competizione has achieved a new standard of realism for virtual GT3 racing. However, iRacing still leads in core online racing functionality.
Physics and Tire Models
The physics engines generate the mechanical forces acting on vehicles. This is integral to realistic handling.
| iRacing | ACC | |
|---|---|---|
| Tire slip angle fidelity | Very good | Extremely accurate |
| Aerodynamic drag modeling | Good | Precisely matched to real cars |
| Suspension kinematics | Detailed profiles | Laser scanned suspension geometry |
ACC‘s tire model is considered revolutionary. The slip angles, which determine grip loss, have been praised by pro drivers as matching real GT3 cars to an unbelievable level. The aero drag curves flawlessly mimic the downforce behavior. This gives an unparalleled connectedness to the car‘s balance through corners.
Tire Feedback and Dynamics
Tires are the most important connection between car and road. ACC sets a new benchmark here.
Tire pressure and temperature dynamics are modeled in ACC right down to the layers of rubber compounds. This affects grip consistency through long stints. Tire wall stiffness translates intricate details like curb strikes and wheel oscillation into the force feedback. No other sim recreates these subtle tire characteristics so plausibly.
Force Feedback
The force feedback physics translate mechanical grip and traction into resistive forces felt in the wheel.
| iRacing | ACC | |
|---|---|---|
| Detail in FFB signal | Good, damping feels artificial at times | Extremely detailed and natural oscillation effects |
| Consistency across cars | Lacking refinement and realism in some vehicles | Exceptionally accurate across all GT3 cars |
Every steering system in ACC was modeled separately per car. The precision in capturing minute suspension movements and chassis flex is incredible. These factors that influence wheel feedback are matched to real GT3 telemetry data. No other title has put so much scrutiny into force feedback.
Graphics and Immersion
The visual experience impacts how believable the simulation feels. ACC has significant advantages here through Unreal Engine.
The material shaders, lighting, and shadows create life-like surface appearances. Ray traced reflections eliminate flat looking cars and mirrors. Trackside details like vegetation behave realistically in the wind. All this visual information heightens realism.
ACC also uses true 24-hour time cycles. This affects ambient temperatures and track conditions by time of day for greater authenticity.
AI and Multiplayer
Believable AI and optimized netcode are both paramount for immersion.
ACC‘s AI drivers have very human-like variations in pace, mistakes, and racing styles thanks to advanced machine learning training. They create unpredictable and exciting offline races.
The netcode uses interpolation techniques allowing over 30 cars online with minimal lag. This enables epic multiplayer events not possible on iRacing.
Verdict
In my opinion as a racing specialist, ACC provides the undisputed cutting-edge of simulation accuracy focused specifically on GT3 machinery. The tire modeling, physics, graphics, and driving aids create an unbelievably authentic experience accessible for all fans. I cannot recommend it enough to players seeking maximum realism.
iRacing still leads in structured online competition and breadth of content. But for recreating the sensations of real GT3 cars, ACC stands at the pinnacle of current technology. The hardcore realism absolutely must be felt firsthand by any true racing enthusiast.
