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INTRODUCTION
Thank you for your purchase of the Holley Commander 950 Fuel Injection System. This tuning manual is designed to
take all of the guesswork out of tuning your Commander 950. Holley is dedicated to providing products for our customers that
not only outperform your expectations, but also are easy to install and tune.
NOTE: We highly recommend that you carefully read through all the manuals included with your system before
installing and tuning your Commander 950 Fuel Injection System. This will eliminate many problem areas and
wasted time. This manual covers only the wiring and tuning aspects of the Commander 950. The hardware
installation manual (if included) will cover all aspects of the actual installation of the mechanical components (manifold,
throttle bodies, etc.).
The Commander 950 systems are the most powerful fuel injection systems available today and are constructed from the
highest quality components that have guided many racers to the winner's circle. Holley’s race-winning heritage and
technology is taken to the next step with our Commander 950 fuel injection systems. These systems are perfect for both
street and full-blown race applications, yet are user friendly.
This controller will allow you to tune fuel delivery, spark timing, boost compensation, fuel pump control, cooling fan, idle
quality, and much more. As sophisticated as this system is, this tuning manual will walk you through each step, giving you
maximum power, driveability, and reliability out of your engine.
Chapter 1 of this manual consists of the terms and definitions of fuel injection management systems. This is a glossary of
components that you will encounter during the installation and tuning of your Commander 950 fuel injection system.
Chapter 2 of this manual will focus on the fundamentals and theory behind electronic fuel injection (EFI). This is where you
will learn about how and why fuel injection works.
Chapter 3 will focus on the skills required to install your Commander 950 system. This includes items such as: basic
computer knowledge, limitations of the system, and general automotive knowledge.
Chapter 4 will focus on the tools required to install your Commander 950 system
Chapter 5 gives comprehensive instruction on the wiring installation of your Commander 950 system. This is a very
comprehensive section and includes step-by-step instructions that are easy to follow in very simple terms.
Chapter 6 covers the software installation, software operational description, computer operation, and fuel map downloading.
Chapter 7 provides step-by-step instruction to get you through initial fire up.
Chapter 8 goes through the basic tuning of your Commander 950. This will include detailed instructions on tuning Speed
Density systems.
Chapter 9 will cover the fine points of tuning required to realize optimal performance in Speed Density systems. This
advanced tuning section will allow you to squeeze every last bit of power and driveability out of your vehicle.
Chapter 10 covers some basic fundamentals for Alpha N systems.
Chapter 11 covers the Datalogger functions.
Appendix 1 covers complete software overview, including: hardware settings, idle air control, PID definitions, and O
2
.
Appendix 2 covers application specific tuning. It will include sections on Race Application, TBI applications, and 5.0L Ford
applications.
Appendix 3 covers tuning troubleshooting.
Appendix 4 is our general troubleshooting guide. This section will answer many of the most common stumbling areas in fuel
injection tuning. If you are having a problem, start by looking through this section first.
Appendix 5 covers the testing and troubleshooting of electrical components, including the testing of : Relays, MAP Sensor,
TPS, IAC, Coolant Temperature Sensor, Air Charge Temperature Sensor, and Oxygen Sensor.
Appendix 6 covers the Oxygen sensor effect on performance.