How F1’s top teams are tackling Mexico’s altitude cooling challenge

Mexico City is Formula 1’s altitude outlier. At 2,240 metres, the air is roughly 25% less dense, so cars generate less downforce and less drag. With 2026’s revised wing rules and active aero, teams cannot simply bolt on Monaco-spec wings. They must add cooling for the engine, battery and brakes while limiting the aerodynamic penalty.

Why it matters:

The lower air density means higher top speeds, longer braking zones and more brake heat. Turbocharged power units still produce similar power, but the turbo works harder and heat rejection does not fall. The energy-heavy layout also loads the battery and control systems. Teams need roughly 25% more cooling, yet inlet areas are hard to change because they are part of the side-impact structure. The focus is therefore on cooling exits and louvres.

The details:

• McLaren raised the rear outlet section above the exhaust to increase exit area.
• Mercedes retained its Austin-spec triangular rear opening, lifting the upper engine cover above the exhaust.
• Ferrari enlarged the side exits while keeping the central section similar.
• Red Bull made little visible change to its rear outlet.
• Sidepod and engine-cover louvres are the critical area. Mercedes and Ferrari use two defined zones where internal radiator flow is weakest; McLaren links its louvres; Red Bull appears least altered.
• Brake cooling is hard to simulate in early-race traffic, when heavy cars overheat brakes and drivers must lift and coast.

What’s next:

The best compromise will be the team that adds enough cooling with the smallest aero loss. Mexico City’s long run to Turn 1 may offer clues, but the full order will not be clear until Sunday night.