The FIA has updated the 2026 Formula 1 regulations to ban the use of the boost function in wet conditions. The boost function can deliver up to 350kW of additional power. Under the new rules, boost mode will be inhibited and not allowed when grip levels are reduced due to wet weather.
Background
The change addresses concerns about the sharp torque characteristics of the new hybrid power units in low-grip conditions. The 2026 cars' electrical systems provide instant torque, making them prone to oversteer in dry conditions. Drivers warned that full boost deployment in the wet could create unpredictable and potentially dangerous situations, especially on corner exits and during acceleration.
Decision Factors
The decision follows limited wet-weather track time for the new cars, with only inconclusive running during Barcelona testing. Increasingly concerning weather forecasts for Miami accelerated the FIA's response after drivers raised concerns.
Additional Rules
In wet conditions, energy deployment will now be controlled through uniform engine maps for a smoother power curve. The FIA also tightened rules on straightline mode in wet conditions, permitting only partial activation of driver-adjustable bodywork in designated low-grip zones, reducing drag adjustments at the front while maintaining a more stable rear-end.
Context
The timing is significant due to the threat of rain across the Miami weekend, with forecasts indicating a high chance of thunderstorms on race day. Local safety protocols in the United States include strict guidelines around lightning that could force delays or stoppages.