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

March 3, 2023

What’s New – March 2023

We can't wait for winter to be over and warmer weather to stay. In the meantime, we've added a few new tracks and are working on a new weather provider for the site. Our old weather provider, Dark Sky, was great and we hope our new one will work well.

Here are the tracks we recently added:

If you don't see your track or course listed here, send it in and we'll add it.

February 9, 2023

Methanol Racing Engines in Cold Weather

Our latest article is up at Racing Junk. Check it out.

Methanol Racing Engines in Cold Weather

January 4, 2023

Happy New Year!

Happy New Year from us to you! With the new year will come a new weather provider and more tracks added to the site. We have more in store as well.

We want to add more tracks to the site. If your track isn't listed, send it to us and we'll add it. We added a few more tracks last month.

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