Motorsports performance depends on air density: The more oxygen in the atmosphere, the greater the potential engine power and performance.
Succesful races have a lot more to do with just how fast your car is, or even the track conditions for that matter, performance can have a lot to do with the environment. A well-tuned race vehicle should be calibrated for atmospheric and environmental factors but sometimes the run does not go as expected.
For maximum performance, engine, launch RPM or shift RPM changes can be affected by air density changes.
Air density forecasts are available through Air Density Online for the Lucas Oil Speedway and for racetracks around the world.
Air Density Online gives racers a very important tool when it comes to fuel system tuning.