Mercedes Launches Immediate Software Fix After Spa Troubles

Mercedes has updated its power unit control software for the Hungarian Grand Prix after tracing George Russell’s straightline speed loss at Spa-Francorchamps to a deployment anomaly on his W15.

Russell loses several tenths in qualifying and retires after a Les Combes clash, his battery emptying earlier than expected on the run to the final chicane.

Mercedes analysis shows control maps front-load electrical deployment, skewing energy usage and leaving limited charge at key points.

Toto Wolff says the software behaviour explains roughly half of Russell’s deficit to Kimi Antonelli, with the remainder down to driving approach.

Investigation highlights a separate opening-lap shortfall. A software mistake reduces harvesting at La Source, prompting extra battery use to counter turbo lag and compromising energy for the Kemmel Straight.

Regulations cap the ramp-down rate when boosting, so both cars carry less power out of La Source than anticipated.

Their lines through Eau Rouge and Raidillon split the outcomes. Russell runs flat, locking lower ramp-down and capping near 308km/h, while Antonelli’s lift keeps him in a stronger deployment window.

That lift also reacts to Max Verstappen’s move, yet it leaves Antonelli in an engine mode that supports the top speed needed to complete the pass, as detailed in the Antonelli Mercedes Belgium analysis.

Mercedes pushes a software update for Hungary to smooth deployment distribution and remove the bias that front-loaded energy to Les Combes.

Hungaroring’s profile typically offers more available energy, so deployment sensitivity should ease, but consistent mapping remains essential for race execution and strategy windows.

The team believes this addresses the qualifying deficit and the race-trim drag-and-deployment compromise that hampered Russell’s ability to defend and attack at Spa, following the recent Mercedes qualifying loophole debate.

Mercedes also identifies why both cars struggle on the first run to Les Combes on the opening lap at Spa, even though Antonelli’s line masks the impact.

With the software corrected, both drivers should access predictable harvesting and deployment patterns, giving engineering groups clearer references for set-up and energy targets through practice.

That, in turn, lets Mercedes focus on tyre preparation and downforce trade-offs rather than firefighting control-system behaviour.

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Daniel Miller

Daniel Miller reports on Formula 1 Grand Prix weekends with race-day analysis, team-radio highlights, and point-standings updates. He explains power-unit upgrades, aerodynamic developments, and driver rivalries in straightforward, SEO-friendly language for a global F1 audience.