August 24, 2024

Fuel Injection High Speed Bypass for NA Engines

The high speed bypass is often used in a fuel injection setup.

NORMALLY ASPIRATED ENGINES
The high speed leans out the engine as the RPM go up and the volumetric efficiency goes down. The VE is often near 100% at the torque peak. The air flow per revolution is max. A typical norm asp engine cammed up for racing may see a torque peak around 5,000 RPM. Tuning should be with the main bypass for max power up to the torque peak or just beyond. We often recommend an AFR of 4.8 to 1 for methanol fuel for the torque peak. (read more...)

April 2, 2024

We are live!

Welcome to our new site! If you are here from Air Density Online, we're glad to have you!

All links on Air Density Online should now redirect here. We have worked to make this transition as smooth as possible but there may be some hiccups. If you have any issues or if you wish to send any feedback, let us know.

March 11, 2024

WELCOME!

Welcome to our new site! If you're new to this site and our partner site, RaceCarBook.com, we're glad you're here. Our sites aim to provide information and tuning tips for racers and engine tuners in the motorsports world. Specifically, we provide information and tools for mechanical fuel injected racing.

If you're here from Air Density Online, this might look a little familiar to you. We hope so! We have kept the new site as similar to the old site as possible in order to make the transition as easy as we can. That being said, we plan on adding new features and making this more useful than the old site.

We will be officially moving all ProCalc & ProTune users over here at the end of this month. We will be in communication with those customers as we go. In the meantime, look around and don't hesitate to send us any questions or comments.