2026 F1 engine concessions explained: unlimited hybrid testing and targeted ICE support. The FIA has unveiled how engine development concessions will work from 2026.

2026 will mark the arrival of new regulations for power units, along with concerns that one manufacturer could gain such a significant advantage that it replicates Mercedes‘ dominance in the years following 2014. To prevent this, the Federation has included in the technical regulations additional development opportunities to support the manufacturers most in difficulty. Here are all the details of the concessions ratified in the latest World Motor Sport Council.

Concessions: How They Work
Among the many new elements of the upcoming regulatory cycle is the FIA’s ability to monitor the performance of individual power units through standardized torque sensors mounted on the axles of each car. What is of most interest is the power of the internal combustion engine: if a given manufacturer’s engine is found to be over 3% less powerful than the most performant engine on the grid, it will unlock extra development opportunities, known by the English acronym ADUO. The Federation will assign any such concessions after monitoring power levels over the first five races of the year and reserves the right to revoke them should performance later exceed initial values. The goal is to prevent manufacturers from deliberately underperforming to gain freer development access without legitimate need.

Any manufacturer granted extra development opportunities would benefit from 30% more dyno testing hours for the internal combustion engine. Furthermore, they would be required to declare their development program to the FIA by March 1st of the following year. The concessions will allow certain parts of the power unit to be upgraded in addition to those already permitted under the technical regulations, which allow for one combustion engine update in 2027 and another in 2029.

Fewer Limits on the Hybrid Side
The extra development opportunities will primarily concern the combustion engine, while the entire electric component—battery, MGU-K, and inverter—is excluded. However, after the latest World Motor Sport Council meeting, the FIA has relaxed restrictions on hybrid development. The regulation has now removed the limits on dyno testing hours for the electric components, although these parts will still be eligible for updates only every two years.