Longitudinal g

Longitudinal g is the push into your seatback when you accelerate and the pull against the belts when you brake. Braking g is usually far larger than acceleration g; a good street car on track tires can brake at more than 1 g, while accelerating at only a few tenths.

The shape of the braking trace is very revealing. An expert's trace rises steeply to peak braking almost immediately, holds there, then tapers off smoothly into the corner. A novice's often ramps up slowly, peaks late and drops off abruptly at turn-in. Each of those soft edges is distance spent not braking hard.

Look at acceleration g at corner exit too: how quickly does it rise after the apex? A late, timid throttle shows up as a flat line. Compare traces from the same corner across laps rather than comparing numbers between different cars.