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Perfect Power XMS4A User Manual
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XMS4A
LetRipp II
Engine Management System
DIY MANUAL
Version 2.1
2
Table of Contents
Default Chapter
2
Table of Contents
2
1 Introduction
5
2 Parts Supplied in the Kit
5
3 Why Should You Read this Manual
5
4 Explanation of Xms4 Units Available
6
5 Technical Details
7
Fuel Injection
7
Ignition
7
Acceleration Enrichment
8
Injector/Engine Priming
8
Trigger Inputs
8
Boost Control
8
Prime (Fuel)
8
Idle Control
8
Setpoint Control
8
6 Feature Explanation
9
Launch Control
9
External Supply to Sensors
9
Maps a / B
9
Calibration
9
Fuel Injection Map
9
Ignition Map
9
Compensation Map
9
Boost Control
10
Setpoint
10
Maximum Recordings
10
Onboard Logging (Coming Soon)
10
Communication Connection
10
Usb Drivers Setup
11
7 Computer Requirements
11
8 Pin Outs of Xms4A Unit
12
Xms4A Pin-Out Table
12
Xms4A Ignition Pin-Out Connector (6 Pin)
12
Xms 4A Injection Pin-Out Connector (8 Pin)
12
Xms 4A Auxiliary Connector (4 Pin)
13
Xms 4A Main Connector (22 Pin)
13
9 Assessing Your Car's Fuel System
14
Is Your Car Ready for Fuel Injection
14
How to Make Your Car Ready for Fuel Injection
14
Figure 1. Fuel System Layout
14
Conclusion
15
10 Assessing Your Engine
15
Compatible Trigger Wheel
15
Figure 2. Enlarged View of Surge Tank
15
Camshaft Sensor
16
How to Install a Compatible Wheel and Pickup Sensor
16
Figure 3. Crank Pulley
16
Which Sensors Are Missing
17
Injector Resistance
17
Figure 4. 60 - 2 Tooth Wheel Setup
17
Make Sure the Engine Has the Basics
18
Conclusion
18
11 Where to Fit Your Xms4A
18
Suitable Places
18
Figure 5. Typical "Under the Dashboard" Installation
18
Unsuitable Places
19
Conclusion
19
12 Where to Fit the Ignition Amplifier
19
Suitable Places
19
Unsuitable Places
20
Conclusion
20
13 Screened Cable
20
What Is a Screened Cable
21
LETRIPP II XMS4A DIY MANUAL V2.1 Www.perfectpower.com I
21
Why Should I Use a Screened Cable
21
What Should You Use a Screened Cable on
21
14 Crank Signals - What Do They Look Like
21
Positive Edge
21
Figure 6. 4 Wire Plus Screen Foil
21
Negative Edge
22
Magnetic
22
Digital/Hall Effect
22
15 Typical Sensors Used and How to Wire Them
22
Amp
23
Engine Temp
23
Figure 7. Wiring of Perfect Power Amp Sensor
23
Air Temp
24
Figure 8. Wiring of Perfect Power Engine Temp Sensor
24
Figure 9. Wiring of Perfect Power Air Temp Sensor
24
Throttle Position
25
Crank Angle Sensor
25
Figure 10. Wiring of Throttle Position Sensor
25
Figure 11. Wiring of Magnetic
25
Camshaft Sensor
26
Conclusion
26
Figure 12. Wiring of Hall Effect
26
16 Typical Devices Driven by the Xms4A
27
Boost Solenoid
27
Fuel Pump Relay
27
Fan Relay
28
Wire Idle Control Motor
28
Shift Lights
29
Rev Counter
29
Injectors
29
Ignition Amplifiers
30
17 Idle Control - in more Detail
31
Two Wire Idle - Software Setup
31
F3 - Two Wire Idle for Xms4A
32
Shift F2 - System Def
32
Idle Rpm Target
33
Shift/F11 - 2Wire Idle
33
Setting up the Idle
34
18 Dwell Time
34
What Is Dwell
34
Can It Damage Your Coil
34
Dwell Setup Via Software
35
19 Setting up Parameters
36
20 System Definition
37
21 Set Points
38
Uses
38
Wiring
38
Setup Via Software
39
22 Calibration of Sensors
39
Amp
40
Engine Temp
40
Air Temp
41
Throttle Position
41
Conclusion
41
23 Rpm
42
Setup and Calibration Via Software
42
Limit
42
Conclusion
43
24 What to Do before Trying to Start the Engine
43
Ignition Setup with Timing Marks and Timing Light
43
Ignition Adjustment Via Software
44
25 Time to Start the Engine
44
First Things to Do When Cranking the Engine
44
First Things to Disable When the Motor Is Running
44
Idle Setup
45
Fuel Setup with Amp
45
Conclusion
47
26 Look here if It Doesn't Start
47
Possible Reasons and Common Checks
47
27 Tuning Your Xms4A for the First Time
48
Options
48
Tools Needed
48
Fuel Tuning
48
Co Measurements
48
Gas Analyser
49
Ignition Tuning
51
28 Cold Start Map
52
29 Acceleration Enrichment
53
30 Setting the Boost Control up
53
Closed Loop
53
Via Pwm
54
31 Launch Control
54
Uses
54
Setup Via Software
55
Conclusion
55
32 Troubleshooting
55
Fuel
55
Pressure
55
Ignition
55
Spark Plugs
56
Coil
56
Two Wire Coil
56
Three Wire Coil
56
Four Wire Coil
57
Trigger Wheel
57
Trigger Sensor
57
Engine Failure, no Compression
58
33 Basic Xms4A-2A Wiring Diagram
59
34 Basic Xms4A-4A Wiring Diagram
60
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Perfect Power XMS4A Specifications
General
Category
Engine
Displacement
4.0L
Cylinders
6
Fuel Type
Gasoline
Aspiration
Naturally Aspirated
Valve Configuration
DOHC
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