Harley-Davidson®













Electronic Fuel Injection Tuner
User’s Manual

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Model Year 2005 Software Updates

• Added Acceleration Enrichment table (AE)
- AE Functions like an engine temperature dependant accelerator pump
- If you increase the multiplier, you get an “Accelerator Pump” effect during throttle roll-on
- 2D table with graphing capability, Fuel Multiplier vs. Temperature in degrees C

• Added Deceleration Enleanment table (DE)
- DE is the mirror image of AE
- If you increase the multiplier, you get less Fuel that normally calculated, but only
during throttle roll-off

• Enhanced Printing of Tables
- When printing a table, comments for that table are printed as well.

• Added “Print All” Capability
- Single command prints all tables associated with a calibration

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Table of Contents
Model Year 2005 Software Updates........................................................................................ 2
Table of Contents .................................................................................................................... 3
Introduction.............................................................................................................................. 6
Kit Contents ............................................................................................................................. 6
Disclaimer & Warnings ............................................................................................................ 6
How to Use This Manual – 1.1................................................................................................. 7
First – Read the Introduction to Harley-Davidson EFI Systems........................................ 7
Second – Glance Thru the User’s Manual........................................................................ 7
Third – Get Comfortable With the Tuning & Data Mode Programs................................... 7
Fourth – Use this Manual as a Reference Tool ................................................................ 7
Introduction – 2.1..................................................................................................................... 8
Harley-Davidson EFI Systems ............................................................................................. 8
How It Works .................................................................................................................... 8
Harley-Davidson Electronic Sequential Port Fuel Injection System, (ESPFI) ................... 8
Current ESPFI Components............................................................................................. 8
Overview of How the Harley-Davidson ESPFI Functions ............................................... 10
Heat Management System ............................................................................................. 12
Installing Software – 3.1 ........................................................................................................ 14
Equipment Needed......................................................................................................... 14
Installation of Screamin' Eagle EFI Tuner Software ....................................................... 14
Getting Started ............................................................................................................... 14
Overview of Software Programs ........................................................................................ 15
Tuning Mode Programs (Basic & Advanced).................................................................. 15
Data Mode Program ....................................................................................................... 16
Basic Tuning Mode – 4.1....................................................................................................... 17
Opening Tuning Program & Selecting File ......................................................................... 17
Tuning Modes & Limits ...................................................................................................... 18
Menu Bar Functions........................................................................................................... 19
Load & Save Tuning Files .................................................................................................. 20
Printing Tuning Tables ....................................................................................................... 21
Programming ECM ............................................................................................................ 22
Edit File Comments & Part Number ................................................................................... 26
Select Display Colors......................................................................................................... 27
Main Fuel Table ................................................................................................................. 28
Main Spark Table............................................................................................................... 30
3-D Graph .......................................................................................................................... 32
ECM Tuning Constants Window ........................................................................................ 33
Advanced Tuning Mode – 5.1................................................................................................ 34
Opening Tuning Program................................................................................................... 34
Tuning Mode & Limits ........................................................................................................ 35
Menu Bar ........................................................................................................................... 36
Load & Save Tuning Files .................................................................................................. 38
Printing Tables ................................................................................................................... 39
Program ECM .................................................................................................................... 40
Edit File Comments & Part Numbers ................................................................................. 44
Select Display Colors......................................................................................................... 45
Air-Fuel Ratio Table ........................................................................................................... 46

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VE Front/Rear Cylinder Table ............................................................................................ 47
Spark Advance – Front/Rear Cylinder Table...................................................................... 48
Warmup Enrichment Table ................................................................................................ 49
Cranking Fuel Table........................................................................................................... 50
Idle RPM Table .................................................................................................................. 51
IAC Warmup Steps Table .................................................................................................. 52
ECM Tuning Constants Screen.......................................................................................... 53
Accel Enrichment Table ..................................................................................................... 54
Decel Enleanment Table.................................................................................................... 55
Table Comparison Commands .......................................................................................... 56
2-D & 3-D Graph Screen.................................................................................................... 57
Data Mode – 6.1 .................................................................................................................... 58
Introduction to the Screamin' Eagle EFI Race Tuner Data Mode....................................... 58
Sophisticated On-Board Data Acquisition....................................................................... 58
Data Organized in Frames ............................................................................................. 58
Main Display Table......................................................................................................... 58
Graphing Display............................................................................................................ 58
Three Mini-Programs Provide Professional Performance Comparison .......................... 59
Manual Format ............................................................................................................... 59
Launching Program & Opening Data Files......................................................................... 60
Data Mode Basics.............................................................................................................. 61
Main Display Descriptions.................................................................................................. 63
Status Bit Names ............................................................................................................... 65
Playback Control Center .................................................................................................... 66
Graph Control .................................................................................................................... 67
Recording Data Files ......................................................................................................... 69
Printing Data Record.......................................................................................................... 74
Exporting Data Files........................................................................................................... 75
Enter/View Comments ....................................................................................................... 77
DTC Code .......................................................................................................................... 78
Time to Distance Estimator ................................................................................................ 79
Quarter Mile Calculator ...................................................................................................... 80
Dyno Horsepower Estimator .............................................................................................. 81
EFI Race Tuning Guide – 7.1 ................................................................................................ 87
Introduction to EFI Race Tuning ........................................................................................ 87
What Can the Screamin' Eagle EFI Tuner Do for Me? ................................................... 87
What Can This EFI Race Tuning Guide Do for Me?....................................................... 87
The 3-Tuning Environments of the EFI Race Tuning Guide ........................................... 88
The 2-Basic Performance Tests ..................................................................................... 88
Consistencies and Concerns in Testing ......................................................................... 89
Checklist of Consistency Concerns ................................................................................ 90
Explaining Air-Fuel Ratio ................................................................................................ 90
Why Would I Want to Adjust the AFR?........................................................................... 91
Symptoms of a Rich or Lean AFR .................................................................................. 91
Lean running symptoms ................................................................................................. 91
Rich running symptoms.................................................................................................. 91
EFI Race Tuning with Basic Tuning Mode By Feel on Closed-Course Track .................... 92
Overview - Tuning By Feel ............................................................................................. 92
Where do I start?............................................................................................................ 92
Inspect and Prepare Bike for Testing ............................................................................. 92

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Test Bike to Determine if There Is a Need for a Tuning Adjustment............................... 93
Throttle Position vs. MAP Table ..................................................................................... 94
Why would I want to adjust the AFR?............................................................................. 95
How would I adjust the AFR? ......................................................................................... 95
Why Would I Want to Adjust the Spark Timing?............................................................. 97
How Would I Adjust Spark Timing? ................................................................................ 97
EFI Race Tuning with Advanced Tuning Mode & Data Mode on Closed-course Track ..... 99
Where do I start?............................................................................................................ 99
Inspect and Prepare Bike for Testing ........................................................................... 100
Test Bike to Determine if There Is a Need for a Tuning Adjustment............................. 101
Why Would I Want to Adjust the AFR?......................................................................... 102
Using Knock Retard as an Indicator of Lean AFR ........................................................ 103
How Would I Adjust the AFR with Advanced Tuning Mode? ........................................ 104
Why Would I Want to Adjust the Spark Timing?........................................................... 106
How Would I Adjust Spark Timing with Advanced Tuning Mode? ................................ 107
EFI Race Tuning with Advanced Tuning Mode, Chassis Dynamometer & AFR Meter .... 109
Overview ……………………………………………………………………………………….109
Where do I start?.......................................................................................................... 110
Inspect and Prepare Bike for Testing ........................................................................... 110
Dyno-Test Bike to Determine if There is a Need for a Tuning Adjustment ................... 111
Why Would I Want to Adjust the AFR?......................................................................... 112
How Would I Adjust AFR with Advanced Tuning Mode, Dyno & AFR Meter?.............. 112
Why Would I Want to Adjust the Spark Timing?........................................................... 116
How Would I Adjust Spark Timing with Advanced Tuning Mode? ................................ 117
Miscellaneous Tuning ...................................................................................................... 119
Cranking Fuel ............................................................................................................... 119
Warmup Enrichment..................................................................................................... 120
Idle RPM....................................................................................................................... 121
IAC Warmup Steps....................................................................................................... 122
Acceleration Enrichment............................................................................................... 123
Deceleration Enleanment ............................................................................................. 124
FAQ’s – 8.1 (Frequently Asked Questions) ......................................................................... 125
Screamin’ Eagle Calibration Information – 9.1..................................................................... 127
Screamin’ Eagle Calibration Descriptions Table........................................................... 127
List of Screamin' Eagle Accessories by Calibration...................................................... 128
Glossary – 10.1 ................................................................................................................... 135
Index – 11.1......................................................................................................................... 138


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Introduction
The Screamin' Eagle EFI Tuner Kit will provide the experienced race tuner with tools and
data similar to what Screamin' Eagle uses to create its EFI calibrations for Stage Kit
configurations. The system is designed for Harley-Davidson Electronic Sequential Port Fuel
Injection, (ESPFI) systems offered on 2001 and Later EFI-equipped Softail models, 2002 and
Later EFI-equipped Touring models, 2004 and Later Dyna models, and 2004 and later V-Rod
models, (from here on referred to as the “current ESPFI” system).

Kit Contents
• 1-CD containing:
► Tuning Mode program including Basic and Advanced sections
► Data Mode program
► Screamin' Eagle EFI calibrations up to the time of this printing for 2001 and
Later EFI-equipped Softail models, 2002 and Later EFI-equipped Touring
models, 2004 and Later Dyna models, and 2004 and later V-Rod models.
► User’s manual
• Computer Interface Module
• Specialized Cable to connect Computer Interface to Data connector on vehicle
• 9-pin male-to-female Serial Port to connect Computer Interface to your computer

This product is designed for Race Use Only

Disclaimer & Warnings
Do not install the EFI Tuner on any model other than those specified in this User’s Manual.
Doing so may result in poor engine performance, electrical-system damage, and/or engine
damage.

This Screamin' Eagle EFI Tuner system is intended for high-performance applications only.
This engine-related performance part is not legal for use on pollution-controlled motor
vehicles. Use of this Screamin' Eagle EFI Tuner system may reduce or void the Limited
Warranty Coverage.

This Screamin' Eagle EFI Tuner system allows the engine to reach optimum RPM. It is
extremely important that the rider use the tachometer to avoid harmful RPM's and possible
engine damage. Engine-related Performance Parts are intended for the experienced rider
only.

Do not exceed 6200 RPM on all Twin Cam 88 engines that use stock valve springs.
Exceeding 6200 RPM on these vehicles may cause engine damage.

Do not exceed 6200 RPM on balanced Twin Cam B 88 engines, regardless of additional
engine modifications. Exceeding 6200 RPM on these vehicles may cause engine damage.

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How to Use This Manual – 1.1

First – Read the Introduction to Harley-Davidson EFI Systems
While it may be tempting to bypass instructions in favor of immediately using the Screamin'
Eagle EFI Tuner, it is likely that some, or all of the information in the next chapter;
Introduction to Harley-Davidson EFI Systems will be critical to your successful use of this
product. Read this chapter to gain a foundation of knowledge in how the EFI system
functions.

Second – Glance Thru the User’s Manual
Take a few minutes to glance through all pages of this User’s Manual to get familiar with its
content.

Third – Get Comfortable With the Tuning & Data Mode Programs
Open and view the Basic, Advanced and Data Mode sections of the Tuning Mode and Data
Mode Programs to get comfortable with their many terms and functions. Click on every box
to view the drop down lists and other command windows. When you encounter a term or
function that you want more information about, use the Index or Glossary in this Manual or
click on the Find Icon in the Adobe™ Toolbar, (looks like a pair of binoculars) in the menu bar
at the top of the Adobe screen. This will locate the page or pages where the word exists.

Note that much of the User’s Manual has information organized in colored text boxes:


Explanations, descriptions and functions are provided in blue-colored text boxes




Step by step commands are provided in yellow-colored text boxes



Tips, notes and warnings are provided in gray-colored text boxes with orange trim




Fourth – Use this Manual as a Reference Tool
The Screamin' Eagle EFI Tuner Kit offers so many tools for tuning and can be used in so
many ways that it will likely take the user some time to fully comprehend the depth of all they
can do. For that reason, the User’s Manual is designed primarily for reference.

Note: There is also a Contents section located in the Help selection of both the Tuning
Mode & Data Mode software programs. Additional information can be found there that
supports the use of this product.

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Introduction – 2.1
Harley-Davidson EFI Systems

How It Works
Before discussing how the Screamin' Eagle EFI Tuner kit works it is important to understand
how the Electronic Fuel Injection system functions on 2001 and Later EFI-equipped Softail
models, 2002 and Later EFI-equipped Touring models, 2004 and Later Dyna models, and
2004 and later V-Rod models. That said, it is assumed that the user of this product has a
thorough understanding of internal combustion engine operation.

Harley-Davidson Electronic Sequential Port Fuel Injection System, (ESPFI)
This completely new engine management system was released starting with select 2001
model year Softail motorcycles. This system is a speed/density, open loop, sequential port
fuel injection design that also controls spark timing and spark intensity.

Speed/Density System – When the ECM monitors manifold air pressure, air temperature,
throttle position and engine rpm to manage fuel delivery.
Open Loop Control – When the ECM monitors sensors positioned on the intake side of the
engine and does not monitor the end result of internal combustion at the exhaust.
Sequential Port Fuel Injection – When the injector nozzle is positioned in the manifold near
the intake valve and is precisely timed to deliver fuel to each cylinder.

This ESPFI system is the exclusive design used on 2001 and Later EFI-equipped Softail
models, 2002 and Later EFI-equipped Touring models, 2004 and Later Dyna models, and
2004 and later V-Rod models.

Current ESPFI Components
The following is a list of the major components of Harley-Davidson’s current ESPFI system.
It is important to have an understanding of what these components do before learning how
the ESPFI system functions. Refer to the appropriate Harley-Davidson Service Manual for
the vehicle you are working on for additional information on component design and function
and for the physical location and testing procedures for each individual component.

ECM – Electronic Control Module – this is the brain of the system that collects input signals
from multiple sensors, makes decisions and sends output signals to deliver fuel and spark to
the engine.
CKP – Crank Position Sensor – this sensor provides input signals to the ECM that indicate
engine rpm, (how fast the engine is running in Revolutions Per Minute). The ECM also uses
these inputs to determine what stroke the engine is in so it can deliver the fuel and spark at
the desired time.

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Introduction – 2.2
MAP - Manifold Absolute Pressure – this sensor provides input signals to the ECM and
reacts to intake manifold pressure and ambient barometric pressure. Intake manifold
pressure reflects changes in engine speed and load. Ambient barometric pressure reflects
changes in atmospheric pressure caused by weather conditions or changes in altitude. The
ECM uses the inputs from this sensor to help calculate how much air is entering the engine.
IAT – Intake Air Temperature – this sensor provides input signals to the ECM as it reacts to
the temperature of the air entering the engine. For example, hot air has less oxygen in it than
cool air. The ECM uses the inputs from this sensor to help calculate how much oxygen exists
in a quantity of air.
ET – Engine Temperature – this sensor provides input signals to the ECM as it reacts to the
engine temperature of the front cylinder head. The ECM uses the signals from this sensor to
determine if the engine is at operating temperature, or warming up.
TP – Throttle Position – this sensor provides input signals to the ECM as it reacts to throttle
shaft rotation, telling the ECM throttle position, if the throttle is opening or closing, and how
fast it’s opening or closing.
VSS – Vehicle Speed – this sensor provides input signals to the ECM to indicate if the bike
is moving or sitting still. It is used mostly to assist the control of idle speed.
BAS – Bank Angle Sensor – this sensor is located in the turn signal module and it sends a
signal to the ECM if the bike leans over more than 45° from vertical. If the ECM gets this
signal for more than one second it assumes the bike fell over and it shuts down both the fuel
management and ignition circuits.
Ion Sensing System – this system uses ion-sensing technology to detect detonation or
engine misfire in either the front or rear cylinder by monitoring the electrical energy at the
spark plug following every timed spark. If an abnormal level of energy is detected across 2 or
3 spark firings the ECM responds by retarding spark timing in the problem cylinder as needed
to eliminate it.
Fuel Injectors – the fuel injectors are electric valves that open and close to deliver a high-
pressure spray of fuel directly at the intake valve. They are controlled by output signals from
the ECM to deliver fuel at a precise moment. If more fuel is needed, the ECM will signal the
injector to remain open for a longer period of time. The period of time is known as the
injector “pulse width” and is measured in milliseconds. One method of rating fuel injectors is
by their flow rate – such as in gm/sec, or grams per second.
Electric Fuel Pump – a 12-volt high-pressure fuel pump, (located in the fuel tank) supplies
fuel under pressure to the fuel injectors.
Fuel Pressure Regulator – a mechanical device that controls fuel pressure to 55-62 PSI by
returning excess fuel from the fuel pump back to the fuel tank.

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Introduction – 2.3
IAC – Idle Air Control – an electric valve that’s threaded, (each rotation is a “step”) and
controlled by output signals from the ECM to open and close as needed to allow enough air
into the engine for starting and idle operation. The greater the number of IAC steps, the
greater the amount of air enters the engine through the IAC passages.

As mentioned, the ECM is the brain of the ESPFI
system. And, like our own brain, it has memories and it
makes decisions. The ECM memories are located in
Look-up tables, (see example Air Fuel Ratio table to
right). The ECM uses several different Look-up tables
to make decisions on fuel and spark management. The
Look-up tables that are in constant use by the ECM are
the VE, (Volumetric Efficiency), AFR, (Air Fuel Ratio)
and Spark Advance tables.

One type of Look-up table the ECM always uses is for VE, which is a percentage rating of
how much air is flowing through the engine while running as compared to its theoretical
capacity. For example, an engine with a displacement of 88-cubic inches running at 5600
rpm at full throttle has a theoretical airflow capacity of 100% when it flows about 143-cubic
feet of air per minute, (cfm). If the same engine flows 107cfm at 5600 rpm it would have a VE
of about 75%. And, if the engine flows about 157cfm at 5600 rpm it would have a VE of
about 110%. That’s right, the VE can exceed 100%, especially in high performance engines
that have improved airflow through the engine. VE reacts to engine speed and to anything
that increases or decreases airflow through the engine. The VE Look-up tables in the
Screamin' Eagle calibrations are calculated from data they gather while testing live engines
on engine and chassis dynamometers, and with data acquisition equipment in conjunction
with track testing.

Overview of How the Harley-Davidson ESPFI Functions
The front and rear cylinder VE Look-up tables, which are programmed into the ECM, tell the
ECM how much air, (volume) is flowing into the engine at different engine rpm and throttle
positions.

The ECM also monitors the intake air temperature and manifold absolute pressure, which
provide it with an indication of air density, or the amount of oxygen contained in a volume of
air.

The AFR, (Air Fuel Ratio) table, which is programmed into the ECM, tells the ECM what AFR
the engine should require under specific engine loads, (engine load is determined by
monitoring manifold absolute pressure and engine rpm) to produce the performance that’s
desired.

The front and rear Spark Advance tables, which are programmed into the ECM, tell the ECM
the spark advance desired for specific engine loads to produce the performance that’s
desired.

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