Sports

Why F1 car set-ups in Mexico go against all logic

The Mexican Grand Prix is an oddity. It comes with its fair share of challenges, for both man and machine as it takes place over 2,000m above sea level.

ARTICLETO NEWS OVERVIEW© XPBimages

F1 teams face a head-scratching weekend at the Mexico City Grand Prix as they tackle the set-up quirks posed by the Autodromo Hermanos Rodriguez.

At an altitude of over 2,000m, the air is thin and this lower air density – with less oxygen in the air – poses a number of challenges both for humans and machines.

So what are the challenges?

Downforce

F1 cars feature two large wings at the front and rear to create as much downforce as possible. Those wings need air pushing cars onto the asphalt, and the denser the air is, the more downforce is generated. The less dense the air is, the less downforce is generated. Although today’s F1 cars generate a lot of downforce under the floor, the wings remain very important.

That’s why [although, it’s not really a choice, rather a must] F1 teams choose to run with maximum downforce set-ups, similar to, say, the Monaco GP. But because these work less effectively on wings at altitude, they bring about roughly the load that normally generates the downsized wings at, say, Monza. Thus, even though the wings are virtually upright, top speeds of 350kph or more can be achieved.

© RN365/Michael PottsThe engine

Those top speeds are achieved even while the engines are producing less power! Oxygen is required for the combustion of gasoline, necessary to run the engine at full speed. At certain ratios between the amount of fuel and oxygen, optimum values are reached, but oxygen is in short supply in Mexican air. And because that optimal ratio doesn’t change, but less oxygen enters the engine through the air intake, less fuel must also pass through it. A less rich fuel mixture results in less power and thus less performance.

Since 2014, some of this has been compensated for by the turbocharger. An F1 car’s turbo has the important job of feeding extra oxygen to the engine. But to compensate for the loss of oxygen in the air, turbos are pushed to the limit. They rev up to 15 per cent more than normal, with all the reliability risks that entails. Moreover, you want the turbo to carry as much cool air toward the engine as possible, but the increasing rpm the turbo makes also releases more heat.

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