Mercedes' first major upgrade package since June fell flat at Sepang, leaving the team scrambling for answers. The spec was designed to claw back medium-high speed downforce, an area where the W15 has hemorrhaged ground to rivals over the summer. The solution: shift the entire bodywork mass forward to free up volume ahead of the rear wheels, moving cooling channels into cannon-shaped passages between the sidepods and engine cover. On paper, it should have worked. On track, it didn't deliver. The team is now deep in the data trying to understand whether the concept itself is flawed or if correlation issues between the factory and the circuit are masking genuine gains. With Singapore's street circuit next on the calendar, Mercedes faces a narrow window to diagnose the problem before another venue where downforce deficits get brutally exposed.
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