F1 DRS Rules Script: Bringing Authentic Formula 1 Logic to Assetto Corsa

Hi everyone! Today we are introducing something completely different—and arguably one of our most ambitious technical projects yet. While Assetto Corsa remains a gold standard for physics, its native DRS (Drag Reduction System) logic is quite basic: if a car has a DRS wing, the driver can flip it open anywhere, at any time.

To bridge this gap, we have developed an in-house F1 DRS Rules Script designed to bring the missing layer of authentic race strategy and regulation to your simulator.

Beyond the Standard Simulator Framework

Developing this script was a significant challenge. Most realism-based DRS mods require external apps or heavy Python plugins that can clutter your UI and drain CPU resources. Our solution is different: it extends the standard simulator capabilities by integrating directly into the car’s physics framework.

By leveraging the physics engine’s internal logic, the script “knows” exactly where the car is and what the track conditions are, allowing for a seamless, automated experience that feels like a native feature of the game.

Safety, Efficiency, and Performance

With the recent community discussions regarding the security of custom Lua scripts and simulator vulnerabilities, we want to be 100% transparent. Our script is built with safety and efficiency as the top priorities.

• Zero Performance Loss: The script is highly optimized. During our benchmarking, we found no measurable impact on FPS or frame timings, even on hardware-intensive grids.
• Safe Architecture: It operates strictly within the intended physics parameters of Assetto Corsa, ensuring no risk to your installation or system stability.

Key Features: Authentic F1 Regulations

The script simulates the three most critical components of modern Formula 1 DRS rules:

1. Race Start Delay: In actual Grand Prix racing, DRS is not a free-for-all on Lap 1. Our script implements a mandatory activation delay, ensuring DRS is only enabled starting from the third lap of the race.
2. 1-Second Detection Logic: We have simulated the “detection point” mechanics. The system checks the gap to the car ahead; if you are outside the 1-second window, the wing stays shut, forcing you to use your driving skill and ERS deployment to close the gap.
3. Automatic Rain Lockout: In the interest of safety and realism, the script monitors track saturation. If it begins to rain significantly during your session, the DRS will be locked, preventing dangerous high-speed aero loss on a wet track.

How to Install: A Step-by-Step Guide

While this script is designed to theoretically work with any DRS-era F1 car (from the 2011 season to the current 2025 regulations), we performed our primary testing using the Kunos Ferrari SF70H.

Installation Steps:

1. Backup: Always start by making a backup of your original data.acd file located in the ks_ferrari_sf70h folder.
2. Unpack: Open Content Manager (CM), navigate to the car’s entry, and hit “Unpack Data” in the bottom tab.
3. Remove ACD: Delete the data.acd from the car’s folder (keep your backup safe!).
4. Integrate: Copy the files from our provided 7z archive into the newly created data folder.
5. Verify: Launch the game and head to a DRS-equipped track like Monza or Spa to test the Lap 3 activation logic.

The Future of Simulation Logic

This script is just the beginning of how we plan to use advanced physics integration to modernize Assetto Corsa. By bringing these “invisible” rules to the sim, we create a more tactical racing environment for leagues and solo players alike.

Download the Technical Physics Data (Google Drive)