A g-suit is primarily used to prevent pooling of the blood in the lower part of the body under longitudinal upward forces. They do not help during lateral (side-to-side) movement, which is what an F1 driver normally experiences when cornering. Even during longitudinal use, a g-suit only helps the pilot to cope with the forces for a longer period of time. It does not necessarily increase his normal tolerance to g-forces. Also remember that a fighter plane will corner when banked over, so the g-suit has use in all flight attitudes that a fighter plane might normally have. Jet fighter pilots do not normally experience lateral (side-to-side) forces.
The limiting factor in a modern fighter planes manoeuvring capabilities is not the plane, but the pilot.
Similarly, in an F1 car, if we ramp up the aero and tyre grip. The limiting factor will be the drivers ability to withstand lateral g-forces, and it may be that it's not the drivers that you think are the best drivers that come out on top there!
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