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

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

September 1, 2022

What’s New – September 2022

We are so close to our goal of 1,000 courses on this site. We are less than 50 away! Keep sending in your tracks if you don't see them listed on the site. The tracks we added last month include:

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