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weather calculations for racing engine tuning

ProCalc
Jetting
Calculator

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

FREE
Weather
for tracks

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

ProTune
Custom
Setups

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

June 1, 2021

What’s new – June 2021

It's so nice to be getting out and around almost like the pandemic never happened! And with the warm weather, we're excited for some racing. We've added more tracks to the site. If you're track isn't listed, let us know and we'll add it.

May 27, 2021

Trial and Error Tuning: our newest article

Check out our newest article over at RacingJunk.com:

Motorsports Fuel System Tuning With Trial and Error or Better

We discuss common trial-and-error tuning methods and what's going on under the hood.

May 14, 2021

Get past weather including air density

We frequently get asked about weather from previous dates. In addition to the current and forecast weather, we have a historical weather option for most tracks. It display hourly weather including air density and density altitude.

You can view historical weather by clicking on the [H] link next to the track name in the list of tracks or by clicking on the historical link on each track's current weather page.

We wrote an article with more information you can check out.