Overview
- Aerodynamics are overhauled with larger front and rear wings and new airflow elements, and the FIA says downforce is nearly doubled versus Gen3.
- Regenerative capacity rises to up to 700 kW and the battery grows to roughly 55 kWh to sustain race power of 450 kW.
- The chassis and battery remain standardized, while manufacturers can develop rear powertrains and software to find performance gains.
- A test mule has covered about 8,000 km, manufacturers such as Porsche and Nissan have begun function tests, and joint running is set for mid‑November ahead of a 2026/27 debut after the final Gen3 season starts on December 6, 2025.
- Bridgestone will supply tyres for the Gen4 era, replacing Hankook.