FIA clamps down on teams' power‑boost loophole

A software‑level loophole that let teams briefly exceed the 100 kW MGU‑K cap was uncovered earlier this season, but a new FIA technical directive has now closed the gap, forcing crews back to the regulated baseline. The trick, dubbed the boost‑overlap method, synchronized MGU‑H and MGU‑K outputs during off‑throttle periods, delivering an extra 5‑10 kW per lap without tripping the flow‑meter alarms.

Why it matters:

• A measurable edge in qualifying and race pace – every kilowatt counts on a tight circuit.
• It upended the power‑vs‑aero balance that teams had built around the 2024‑25 hybrid package.
• The FIA’s move reinforces the integrity of power‑unit rules ahead of the 2026 hybrid overhaul.

The details:

• The exploit hinged on a timing glitch in the ECU that allowed the MGU‑K to harvest energy from the MGU‑H for a fraction of a second after the driver lifted off the throttle.
• Engineers programmed a "recovery window" that bypassed the 100 kW limit by temporarily rerouting harvested energy into the kinetic system.
• FIA’s Technical Directive 12‑3 now clarifies that any energy transfer outside the defined "deployed" window is illegal and introduces a 0.5‑second monitoring period for each lap.
• Penalties for breach include a 10‑second time penalty or loss of constructor points.

What's next:

• Teams must re‑optimize power‑unit maps, likely sacrificing a few tenths of a second per lap.
• Development focus will shift to aerodynamic refinements and tyre strategy to recover lost time.
• The FIA will conduct random ECU audits throughout the remainder of the season to deter similar exploits.

With the boost‑overlap gone, the championship could tighten, giving rivals a chance to close the gap before the 2026 engine regulations take effect.