Air Density Online

weather calculations for racing engine tuning


Jet your car from anywhere with an internet connection. Have a smartphone? You now have a portable jetting calculator.

for tracks

Real-time density altitude from current weather data at various tracks including: NHRA & IHRA dragstrips, road courses, dirt ovals.


Get your MFI fuel system setup programmed into ProCalc. Even get your dyno data added. You get 1 year of access to ProCalc too!

Thanks for visiting our site. We provide real-time, historical, and forecast weather data for racing engine tuning. We also provide engine tuning tools for mechancial fuel injected racing engines. We are constantly adding tracks to the site. If you'd like to see your track added to the list, send it over. Learn more about this site and it's creators or read some of the articles we've written.

What's New

January 22, 2020

Review some articles…

Racing season in the US will be starting up soon. Review some of our articles to refresh your tuning skills. We've written several articles on weather and engine tuning. Here are a few we are particularly proud of.

January 11, 2020

Whats new for 2020

We are excited for the 2020 racing season to get started. In the meantime we're adding new tracks and updating the site like crazy. Recently we added a number of motocross tracks to the site.

If you race at a motocross track not listed here - or any kind of racing track - let us know and we'll add your track.

January 1, 2020

Happy New Year

We have lots of new things in the works and lots to look forward in the new year. We hope you are recovering from the holidays and looking forward to the upcoming racing season.

Here are some of the latest tracks we've added.

view news archive

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© 2020