FIA bans Mercedes and Red Bull's qualifying MGU‑K boost trick

The FIA has banned a software maneuver that let Mercedes‑ and Red Bull‑powered cars keep their MGU‑K fully deployed at the end of qualifying laps, sidestepping the mandated 50 kW‑per‑second ramp‑down and gaining a brief 50‑100 kW boost.

Why it matters:

The trick threatened qualifying fairness, gave an illegal edge, and created safety risks when drivers lost rear‑end torque on the final straight.

The details:

• The rulebook allows a “continuous offset” mode that locks the MGU‑K for 60 seconds after a driver‑initiated shutdown, intended for genuine emergencies.
• Mercedes and Red Bull triggered the shutdown just before the timing line, then re‑enabled the unit, dodging the 50 kW‑per‑second ramp‑down and grabbing a brief power boost.
• The FIA clarified the offset function is only for genuine failures; using it to preserve power is now a breach.
• At Suzuka, Antonelli (Mercedes) and Verstappen (Red Bull) struggled to finish laps after the shutdown left the cars without rear‑wheel drive; Williams’ Albon also stopped.

What's next:

Teams will have to follow the standard ramp‑down schedule for the rest of 2026, and any software tweaks will be closely monitored. The FIA says telemetry can spot unauthorised MGU‑K shutdowns, with penalties for repeat offences. With the loophole closed, qualifying should become a purer test of chassis aerodynamics and tyre strategy.