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!

August 13, 2018

Thanks to Bob Beck #46!

Alan Beck #4, Bob Beck's son, storming around the Tom Manning Memorial race in their 360 engine powered Gun Slingers Winged Sprint Car at the 'Noceti family' Stockton 99 Speedway on June 6, 2018.

We recently had a discussion with one of our ProTune customers, Bob Beck #46 regarding his use of our site. Check out his thoughts on his experience:

Regarding fuel mixtures for Co. Nat. Spdway and Stockton races:

  • for the 360 engine; I used the program you have set for the 360 and ran the entire show; 7/6-7/18 at Co. and the Stockton show without having to adjust fuel mixture.
  • For the 410 engine used the program for the 410 and had to adjust mixture on all days raced. At Stockton it got so rich I didn’t bother with the HS bypass and went directly to the main jet.
  • I have concluded that some thing is not correct in 410 program: I believe it is the pump flow; 4.07.
  • I back tracked main jet change to pump flow of 4.56 +-.
  • I have sent pump to be flowed (subsequent flow test, 4.9 GPM).
  • I never new before how critical fuel mixture could be.
  • In years past I would be walking all over cars in warmups but later in the evening I could hardly keep up to the same cars.
  • What an eye opening this is.

Bob Beck #46

Thank you so much to Bob for sharing his thoughts and experiences!

August 6, 2018

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July 30, 2018

It’s the End of Another Month

In July we made a few layout changes to the site. We are also busy writing articles for several outlets and adding tracks to the track weather section. It's been a busy month with lots more to come!

Here are the tracks we added in July:

We are now adding tracks worldwide. If you don't see your track in the list, let us know and we'll add it.

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