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Tuning Your Ford EFI System - Inside The Black Box Part 1

Tuning Your Efi System Fuel Injected Engine
The '86-'87 Mustang 5.0 port... 
   
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Tuning Your Efi System Fuel Injected Engine
The '86-'87 Mustang 5.0 port fuel-injected engines used SD fuel control, with a return-style fuel flow system. Note the lack of a MAF sensor on the air inlet.
Tuning Your Efi System Fuel Control Table
Here's an example of an Alpha-N... 
   
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Tuning Your Efi System Fuel Control Table
Here's an example of an Alpha-N fuel control table. Cell entries are actual fuel injector pulse widths for various throttle blade angles and engine rpm.
Tuning Your Efi System Returnless Fuel System
After 1999, Ford went to a... 
   
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Tuning Your Efi System Returnless Fuel System
After 1999, Ford went to a returnless fuel system. Said system is found in any stock '03-'04 Cobra. A fuel rail pressure sensor (found on the driver-side fuel rail), monitors the fuel pressure, so the ECU can regulate the fuel pumps as necessary to maintain a constant pressure drop across the injectors.
Tuning Your Efi System Base Fuel Table
For SD and MAF fuel control,... 
   
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Tuning Your Efi System Base Fuel Table
For SD and MAF fuel control, a Base Fuel table is used, which gives Open Loop A/F values for various rpm and Load values. For early EEC-IV, the Base Fuel table actually targeted A/F from load and Engine Coolant Temperature, as shown here.
Volumetric Efficiency Table
For SD fuel control systems,... 
   
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Volumetric Efficiency Table
For SD fuel control systems, a Volumetric Efficiency Table is required, as shown here for an '87 Mustang application. Load is calculated from MAP.
Tuning Your Efi System Maf Fuel Control
All '89-and-later Ford EFI... 
   
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Tuning Your Efi System Maf Fuel Control
All '89-and-later Ford EFI systems use MAF fuel control. The large 90mm '03-'04 Cobra MAF shown here is an excellent retrofit for earlier performance applications.

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