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hr option will be ideal. 60 lb/hr injectors are reserved for larger engine displacements with race
camshafts, while 29 lb/hr injectors can be used for engines with less than 350 CID.
Ignition Control: All Pro-Flo 3 EFI systems are configured by default to control the engine's
Ignition Timing. Only the distributor included with the Pro-Flo 3 system can be used, and the Base
Timing setting must be configured before Ignition Timing can be controlled using E-Tuner.
Intake Manifold: Pro-Flo 3 EFI systems are compatible with 2 intake manifold options: Pro-Flo
4150 and Pro-Flo XT. The Pro-Flo 4150 accepts a 4150-Flange 4-barrel throttle body, while the
Pro-Flo XT uses a 90mm single blade throttle body. It is important to specify which manifold is
being used, since Idle Target adjustment procedures are different between these 2 options.
EFI COMMON TERM DEFINITIONS:
Direct Port Injection: Direct Port Injection offers a more "direct" way of injecting fuel into your
combustion chamber. Edelbrock's Pro-Flo 3 Direct Port System places fuel injectors in each
cylinder's intake port on the intake manifold. By delivering fuel more directly, the Pro-Flo 3 EFI
System will improve the overall performance, idle quality and throttle response over a simpler
throttle body injection (TBI) system. Installation of a Pro-Flo 3 EFI System is slightly more involved
than a TBI system as it involves replacement of the intake manifold, carburetor and distributor.
Electronic Control Unit (ECU): The ECU is an electrical module that receives inputs from sensors
and outputs signals to actuators on the Throttle Body. The ECU communicates wirelessly via
Bluetooth using the Edelbrock E-Tuner Android app to most Android devices. This allows the
adjustment of the ECU Settings and the engine's performance in real-time.
Wide-Band Oxygen (O2) Sensor: A wideband oxygen sensor allows the air/fuel ratio to be
measured over a very broad range (10.2 up to around 21:0). The Wide Band Oxygen sensor used
for Pro-Flo 3 is a Bosch LSU 4.9. The Pro-Flo 3 EFI system has been calibrated specifically for use
with a LSU 4.9 sensor, no other oxygen sensor types may be substituted.
Base Map: The Base Fuel map is made up of coordinates of RPM (speed) and Vacuum (load) and
Injection Time. The idea of the base map is to provide the engine with a general guideline that will
let it start and run reasonably well. However, it cannot adjust for all driving conditions and slight
variations in engine configurations not covered in the wizard. This is where Closed Loop and Self-
Learning come into play to fine-tune the base map.
Closed Loop: Air Fuel Ratio feedback from the Wide Band Oxygen Sensor provides the ECU with
necessary information to calculate and adjust the Injection Time as necessary to maintain the
designated AFR Setpoint under all load conditions. The percentage of Injection Time correction the
ECU is calculating is displayed as AFR Correction (AFR Corr).
Self-Learning: This feature works side-by-side with Closed Loop control. The ECU reads the AFR
Corrections the Closed Loop is calculating and saves them to a self-learn table. The self-learn table
and Base Map values are used to calculate the final injection time necessary to maintain a proper
Air Fuel Ratio with minimal Closed Loop Corrections. As the vehicle is driven through various loads,
speeds, and conditions, the ECU continually updates and saves the self-learn table values. Initially,
higher AFR Corrections may be observed as the vehicle is driven. These corrections should be
reduced as the self-learn table is populated.
Operating Temperature: For the Pro-Flo 3 EFI system, operating temperature is a coolant
temperature of 170°F. It is very important that the correct temperature thermostat (180°F),
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