[Tom Vaught]

Even though I am considered a "Holley Guy" or a "Carburetor Guy", I spent several years working in my previous job involved in designing EFI Calibrations before they went into production.

We had dedicated Program Teams with their own Calibrators who actually dialled in the EFI Calibrations for each vehicle package.

Here are some of the features of a Good EFI System:

Basic Information:

Engine - Number of Cylinders, Displacement & Injector Size.
MAF configuration
Ignition System configuration
Manifold Absolute Pressure sensor configuration (must be GM sensor)
Throttle Position sensor configuration
Profile Ignition Pickup configuration
Module configuration, Always Override, RPM Override, TP Override & RPM/TP Override.

Fuel Strategy: Just like the carburetors, setting main jet size, power valve selection and idle air bleeds. A/F Ratio is the pounds of air measured by MAF divided by the amount of fuel, hence depending on the amount of air the motor can flow, amount of fuel needs to be adjusted accordingly. Typically, WOT A/F Ratio of 12.5:1 & at idle and part throttle 14.6:1.

Base Fuel - Idle, Part Throttle, WOT A/F Ratio
Fuel Modifiers
Air Charge Temperature Fuel Modifiers
Coolant Temperature Fuel Modifiers
Throttle Position Fuel Modifiers
Manifold Absolute Pressure Fuel Modifiers
Cranking Fuel
Injector Offset
Transitional Fuel Enrichment
Transitional Fuel Enrichment TP Multiplier
4 Programmable Output Multipliers*
3 Analog Channel Fuel Multipliers*

Spark Strategy: Simply stated, to adjust the total spark advance for your motor. A typical total spark advance ranges between 26 to 36 BTC depending on the motor. Spark advance tables will be based on Idle, Part Throttle & WOT. However, there are many other things that affect this, and hence perfect spark advance timing curve for your motor must be achieved by trial and search.

Idle, Part Throttle & WOT Spark Advance
Air Charge Temperature Spark
Boost Retard
Coolant Temperature Spark
Manifold Absolute Pressure Spark
Nitrous Oxide Spark Retard
Throttle Position Spark
4 (or more) Programmable Output Multipliers*
3 (or more) Analog Channel Fuel Multipliers*

*At Least a total of 4 programmable and 3 analog multipliers.

Engine RPM Limiters:

Fuel Rev Limit
Spark Rev Limit
Stage Rev Limit

Data Aquisition & Data Logging

Wiring Schematics

Have a great day.

Tom V.