Taking many measurements from onboard control units, race data harnesses accelerator pedal positions, braking pressure, clutch engagements, gearing positions, steering ability and more. With detailed timestamps of acceleration, braking and steering angle drivers are able to shave off milliseconds on a race track. Plus, race data is very useful in correcting driver habits.
Race data can be used to compare drivers, improve lap times and see how a vehicle handles performance upgrades. Feeding all of this to a remotely accessible program enables live data feeds that track engineers can analyse. Allowing much quicker improvements and live feedback to drivers to improve their chance of finishing higher in the race standings.