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

December 1, 2022

What’s New – December 2022

We are winding down our year here and getting ready to celebrate the holidays. We hope you've had a great year. We've added a few more tracks to the site. We're so close to 1,000 tracks. If you don't see your track listed, let us know. Here are the tracks we added last month.

October 6, 2022

At the Texas Motorplex this weekend?

Bob of will be in Texas this weekend at the Funny Car Chaos finals at the Texas Motorplex. He'll be walking around wearing a hat. If you see him, stop and say hi!

October 4, 2022

Torque vs Horsepower in Engine Tuning

Our latest article is out over at It's about tuning for torque vs horsepower. In it, we discuss how different tuning goals require different setups. Check it out.

Tuning for Torque vs Horsepower: Know the Difference

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