Mercedes brought their first major upgrade package since the Canadian Grand Prix but struggled to extract performance at the Bahrain Grand Prix in Malaysia. The team introduced new floor, sidepods and rear corner modifications expected to deliver three-tenths improvement, yet both drivers appeared to go backwards in qualifying.
George Russell finished eighth in qualifying despite the upgrade, while championship leader Kimi Antonelli managed fourth after complications in Q2. Team principal Toto Wolff described being caught out by car behavior not seen all year, with the W17 losing significant time on straights and suffering excessive understeer.
The upgrade represents Mercedes' move from undercut sidepod geometry to a ramped profile creating simultaneous inwash and downwash effects. Russell reported feeling additional downforce in high-speed corners, but tire overheating issues overshadowed any aerodynamic improvements at the demanding Malaysian venue.
Without the ability to run direct comparisons between old and new specifications, Mercedes faces challenges understanding the package's true potential. The rough Sepang track surface and extreme heat conditions complicated evaluation, making it difficult to separate upgrade effects from circuit-specific characteristics.