‘How-to’ fuel injection jetting videos

Video: How to set up fuel injection jetting in a ProCalc calculator

A baseline is the default jetting setup.  It is the starting point for tuning for air density changes at a subsequent race.  It may also be the starting point for a new FI setup.

ProCalc provides an easily retrievable record for precise numerical control over subsequent MFI setup & tuning.

This video demonstrates how to enter your various fuel injection engine values into the calculator.  Different jetting entries are illustrated. This video is a relatively thorough instruction for how to do a complete baseline setup including multiple rows of nozzles.  This video illustrates a Roots blown engine combination.  Other than the blower size and overdrive entries, the remainder of the video applies to the normally aspirated fuel injection format also available in the calculator.

Creating Your First Baseline

Video: How to set up a new fuel injection jetting combination

To develop a brand new setup from the extensive calculator ‘help’ library, the fuel injection for a normally aspirated 350 cubic inch engine is profiled.  A straight alcohol setup is made.  The use of nozzles and main bypass jets from a preexisting inventory are used as an example.  That is to examine if a reasonable combination can be achieved with these parts that are already on hand.

A very powerful calculator ‘jetting from pressure’ is illustrated.

This calculator determines all the jetting to simultaneously meet both the amount of fuel & the fuel pressure targets.  The common trial-and-error alternative often leads to poor performance and/or engine damage.  It also takes a lot of testing.  This ‘jetting from pressure’ calculator alternative is the easy way.

A new baseline from scratch

Video: How to set up different hat nozzles & maintain port nozzles, fuel mixture, & fuel pressure

For advanced tuning, certain nozzle changes are often needed; such as for fuel distribution improvements.  This video illustrates how the calculator can be used to maintain other nozzle sizes, fuel mixture, and fuel pressure with specific nozzle adjustments.

Video: How to tune a blown alcohol engine for tomorrow’s race day air density

A 14-71 blown alcohol setup is demonstrated in this video.  Hat and port nozzles are used.

Jetting to meet both the fuel mixture and fuel pressure targets are easily determined using the calculator.

Jetting for an increase in fuel pressure is demonstrated.  That would be to get more engine response.

Jetting From Pressure from Air Density Online

Video: How to determine the main bypass for a good tune-up

One of the ProCalc jetting calculators, ‘calculate main bypass’, is demonstrated. Planning for main bypass changes is illustrated for air density forecasts, a day or two in advance of racing.

Finding Your Main Bypass

Video: How to determine engine nozzles for a good tune-up

The next ProCalc jetting calculator, ‘engine nozzles’, is demonstrated.  Provisions are shown for how to fix certain nozzle sizes in the calculator calculations, such as port (or down) nozzles, and determine hat (or up) nozzles for a target AFR and fuel pressure.

This is a powerful tool to dial in a jetting combination, especially with a preexisting inventory of nozzles.

Some of the hat or up nozzles can be fixed as well to determine only select nozzles to change for a tune-up such as for better fuel distribution.

Calculating Engine Nozzles with Air Density Online

More ‘How-to’ fuel injection jetting videos: advanced

Videos for advanced MFI tuning are also provided in the calculator:

Video: Jetting for high altitude


Video: Torque peak & horsepower peak


Video: Adding nitro to blown engines


Video: Adding nitro to normally aspirated (NA) engines


Video: How to determine high speed bypass poppet pressure


Video: Simple turbocharger fuel system with mechanical fuel injection


Video: Drag racing jetting profile setup


Video: Analyzing a fuel injection baseline


Give it a try!

After watching all these video, if you’re not already a ProCalc user, try it out free for 2 weeks.

Free 2 week trial: ProCalc