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Holley Terminator Stealth EFI User Manual

Holley Terminator Stealth EFI
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550-442 EFI Throttle Body w/ GM Trans Control - Polished
550-443 EFI Throttle Body w/ GM Trans Control Hard Core Gray
550-445 EFI Throttle Body w/ GM Trans Control Classic Gold Finish
FUEL INJECTION INSTALLATION MANUAL
Read this manual before using this product.
WARNING!
This instruction manual must be read and fully understood before beginning installation. If the instructions are not fully
understood, installation should not be attempted. Failure to follow the instructions may result in subsequent system failure and
could result in serious personal injury and/or property damage. Keep this manual.
For the safety and protection of you and others as well as your vehicle, only a trained mechanic having adequate fuel system
experience should perform the installation, adjustment, and repair.
While undertaking any work involving the fuel system, it is particularly important to remember one of the very basic principles of
safety: fuel vapors are heavier than air and tend to collect in low places where an explosive fuel/air mixture may be ignited by
any spark or flame resulting in property damage, personal injury, and/or death. Extreme caution must be exercised to prevent
spillage and thus eliminate the formation of such fuel vapors. All work involving this product and the fuel system generally
MUST be performed in a well-ventilated area. Do NOT smoke or have an open flame present near gasoline vapors or an
explosion may result.
Any components damaged due to failure to follow these instructions will not be covered by the warranty. Failure of any one
component does not constitute, nor does it justify, warranty of the complete system. Individual service items are available for
replacement of components. If assistance is required or if you need further warranty clarification, please call Holley Technical
Service at 1 (270) 781-9741 or (866) 464-6553.

Table of Contents

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Holley Terminator Stealth EFI Specifications

General IconGeneral
Fuel TypeGasoline
ECU IncludedYes
Maximum Horsepower Rating650 HP
Self-LearningYes
Data LoggingYes
ECU LocationMounted on Throttle Body
Display TypeLCD
Touchscreen IncludedNo
WarrantyLimited

Summary

INTRODUCTION & SYSTEM REQUIREMENTS

Fuel System Requirements

Details the necessary fuel system components, including pump capacity, pre-filters, post-filters, and regulator type.

TOOLS REQUIRED FOR INSTALLATION

OXYGEN SENSOR INSTALLATION

OXYGEN SENSOR WELD RING INSTALLATION

Instructions for welding a bung into the exhaust for oxygen sensor installation, including drilling and welding procedures.

COOLANT TEMPERATURE SENSOR INSTALLATION

THROTTLE BODY & CABLE BRACKET INSTALLATION

Throttle Connections

Details on connecting throttle linkage and cables, ensuring smooth operation and proper geometry for transmissions.

ECU MOUNTING AND WIRING OVERVIEW

WIRING HARNESS INSTALLATION

Harness Routing

Guidelines for routing the wiring harness through the firewall and within the engine compartment for optimal installation.

Sensor Connections & Loose Wires

Instructions for connecting various sensors and loose wires, including power, ground, and signal connections.

IGNITION WIRING

OPTION 1: "Coil -" engine speed input

Wiring instructions for using a stock inductive ignition coil for engine speed input, suitable for mechanical distributors.

OPTION 2: “Tach Out" engine speed input

Wiring for aftermarket Capacitive Discharge ignition systems, connecting to the "Tach Out" or wire these systems provide.

TRANSMISSION WIRING

INITIAL POWER-UP

CALIBRATION WIZARD

TPS AUTOSET

TRANSMISSION SETUP

SENSOR VERIFICATION

STARTUP

SETTING IGNITION TIMING

AFTER-STARTUP

IDLE SETTING/THROTTLE PLATE SETTING

SELF-TUNING

CUSTOM SETUPS

BASIC TUNING

Basic Fuel

Adjusts core fuel parameters like Target AFR, Acceleration Enrichment, and Fuel Prime for basic engine tuning.

Basic Idle

Allows adjustment of the target hot engine idle speed to achieve desired idle RPM and quality.

Spark

Adjusts ignition timing parameters at idle, cruise, and wide-open throttle for optimal engine operation.

TRANSMISSION

SYSTEM SETUP

ADVANCED TUNING

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