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McLaren Fits Mercedes Power Unit and Trials New Rear Wing Ahead of Belgian GP

Teams will test energy management at Spa to gather data that feeds a larger upgrade wave in Hungary.

Overview

  • McLaren confirmed on Wednesday that both MCL40 cars will receive Mercedes’ latest-spec internal combustion engine and the team will evaluate a new rear-wing assembly in Friday practice.
  • Forecasters and multiple outlets project a wet weekend at Spa-Francorchamps, raising the prospect of the season’s first competitive wet sessions and added strategic uncertainty for practice, qualifying, and the race.
  • Spa’s long high-speed sections make battery harvesting and deployment decisive under the 2026 hybrid rules so teams expect heavy use of the ‘super clip’ and will prioritise energy-management set-up across the weekend.
  • Honda and Aston Martin will treat Belgium as a data mission to refine energy-deployment settings before their planned engine upgrade, and several teams view Spa as a final proving ground ahead of larger Hungary upgrades.
  • Kimi Antonelli’s championship lead has been cut to 25 points after recent setbacks, making Spa a key weekend for leaders to convert pace into reliable results and for rivals to close the title gap.