Edelbrock 3670 User Manual - page 12

12

and the method of interfacing to the engine; some of the strategies described in this

guide may not be visible or may be pre-calibrated for you. Systems also vary as to their

configuration: mass airflow, speed density or speed-throttle, oxygen sensors, ECU, and

so on – slightly altering the calibration process. Descriptions of the functions are usually

available next to the item or in the header of the map to aid the calibrator. The “HELP”

menu in the calibration software also contains much useful information; as well as the

documentation for your system, and can be selected at any time during software usage.

Always use the documentation for your exact system as the primary reference for system

setup and questions.

Ideally, calibration is performed with the vehicle on a chassis dyno where all loads and

speeds may be calibrated under controlled conditions. In cases where dynamometer

running is not possible, the tuner should enlist the help of another to drive the vehicle

while the tuner makes adjustments with the laptop between runs or make table

adjustments based on recorded logger data. 

Vehicle calibration

should ONLY be done

on a closed road-course or drag strip with helmets and all other proper safety

gear in place.  Be aware also that some adjustments may be necessary even

after an engine is dyno tuned.  Different engine dynos will load the engine

differently and they do not always accurately simulate vehicle conditions.  This

is especially true for transient operation (throttle snaps, etc.).

3.1.1

Strategies and Methods

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Strategies and Methods

Control System Concepts

The Engine Management System functions by receiving inputs from various sensors,

making calculations and operational decisions, and sending appropriate instructions to

outputs that control devices and actuators. In order to do this, the Engine Control Module

(ECM) converts the analog inputs to digital signals and processes them within the 32 bit

microprocessor. Outputs are conditioned as required for the assigned purpose.

Your Edelbrock system is capable of three different fuel/timing control strategies.  

Modeled speed density uses sensor inputs along with a volumetric efficiency (VE) table