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Pontiac - Boost Turbo, supercharged, Nitrous, EFI & other Power Adders discussed here. |
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EFI Comments
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.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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