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.
Combustion is between oxygen and fuel. The ratio of the two determines whether a mixture is best horsepower, best torque, rich, moderate, or lean. Air to fuel ratio (AFR), the basis for tuning with ProCalc, combines the weight of the air and the weight of the fuel. The air is only 23% oxygen by weight. The remainder of air is essentially inert to horsepower making combustion.
Methanol is a combination of combustion-making compounds, carbon/nitrogen/hydrogen, and oxygen. The oxygen to fuel ratio (OFR) combines the the oxygen from the air with the oxygen from methanol. That is ratio’d with the combustion making compounds.
The air to fuel ratio (AFR) and the oxygen to fuel ratio (OFR) are in proportion for straight methanol. Nitro has a different amount of oxygen. The amount of oxygen in a nitro-methanol mixture is more complicated. It is a function of several items:
- air density
- amount of air intake
- nitro-methanol mixture ratio
- amount of fuel to the motor.
The oxygen to fuel ratio (OFR) takes all of these into account for a single numerical rating of the tune-up. As the air density changes, the tuner can adjust one of the others, in exact proportion, to hit a target oxygen to fuel ratio. The result:
- a simple determination, ahead of time, of a tune-up to best avoid engine damage
- a powerful tool to develop maximum power around the maximum OFR ratio.
More results will follow.
link to NHRA National Event Drag Racing, Chicago, May 30-June 2: air density, density altitude, grains, forecast, historic, & metric data “for good spark plug readings”:
Indianapolis 500 practice: May 14-17, 2019
Indianapolis 500 qualifying: Sat May 18, Sun May 19
Indianapolis 500 practice: Mon May 20
Indy 500 Miller Lite Carb Day: Fri May 24
Indy 500 Firestone Legends Day: Sat May 25
103rd running of the Indianapolis 500 high speed circle race: Sun May 26
current imperial weather units with map & weather forecast description: https://airdensityonline.com/track-results/Indianapolis_Motor_Speedway/
current metric weather units with map & weather forecast description: https://airdensityonline.com/track-results-metric/Indianapolis_Motor_Speedway/
historical weather hourly data example: https://airdensityonline.com/track-history/Indianapolis_Motor_Speedway/2019-05-01/
forecast weather hourly data: https://airdensityonline.com/track-forecast/Indianapolis_Motor_Speedway/
Air density data for tuning to those spark plug readings, aerodynamics, & tire drift.
The Boddie team did another great job of hosting a fine drag racing door slammer & motor cycle event. Spectacular Pro Mods competed side-by-side for round-after-round racing. Street and cycle racers competed in a lot of close competition. A thousand spectators, just near the starting line, were witnessing the competition antics and round wins with high emotion! Spark plug readings were abound throughout the pits although air density deviated only between 96 & 99%. Density altitude deviated only between 200 & 1,400 ft. That small amount of air weight change accounted for only a 3% needed change in fuel weight delivery to the racing engine. That is a small change and possibly ignored by some of the better dialed-in setups. EFI racing engines were tuning with the lap top. MFI engines needed only minor jetting changes if any at all. Several Enderle and Hilborn fuel injection setups. Rons MFI as well. Grid and launch control was throughout. Few oil downs. Couple guard rail skirmishes. Big tire as well as small tire setups. Transmission & differential fialures from high powered engines. Some engine fualiures. A lot of high dollar billet & CNC machined racing parts!
New ADO Weather History Retrieval Feature
For racers wanting to reconstruct the weekend weather for record keeping, hit the Sacramento Raceway link at https://airdensityonline.com/track-results/Sacramento_Raceway/; hit the hISTORY link on the page; enter the EVENT DATE. All of the air density values for the weekend can be retrieved.
Original Event Announcement
Team Boddie test and tune, Fri. April 12, 2019, Sacramento Raceway
Team Boddie 1/8th mile racing, Sat. April 13, 2019, Sacramento Raceway
Air Density / Density Altitude / Grains of Water for racing engine tuning from ADO
Air density, track MAP LOCATION: https://airdensityonline.com/track-results/Sacramento_Raceway/
Air Density METRIC units, MAP LOCATION: https://airdensityonline.com/track-results-metric/Sacramento_Raceway/
Air density FORECAST: https://airdensityonline.com/track-forecast/Sacramento_Raceway/
HISTORICAL air density example: https://airdensityonline.com/track-history/Sacramento_Raceway/2019-04-07/
That time of year again for the wildesssst drag racing event ever at Sacramento Raceway for mega powered door slammer drag racers running 1/8th mile “all-out” competition. The Boddie Team family, friends, and spectators will be out ‘in mass’ to enjoy a weekend of drag racing. Last year’s events brought out families and friends in a warm and enthusiastic competition event. Everyone was polite and enthusiastic. I felt a feeling of safety at this event, away from the tabloid crisis’ dominating the news! New racers are always showing up with really sharp high powered racecars and motor cycles. Most of these motor vehicles frequent the street for car shows and spontaneous auto events around the circuits. Just about every car or bike model is represented. You get to see what your car or bike could do from watching a similar model running at the track with a mega motor! Cars over 2,000 HP are the standard. Rumor is some of the cars are over 3,000 HP! 4,000 HP! Maybe even 5,000 HP! Some of the bikes are 2 to 3 times their original power levels! How about a turbocharged ‘Harley Hog’ in full dress!
Sacramento Raceway (916) 363 2653
Team Boddie website link
Team Boddie 2017 link from RCB