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G4X MonsoonX ECU

Small, but mighty! 

The Link G4X AtomX ECU is the latest version of our entry-level ECU. Don't let its size fool you however, the AtomX has expanded data logging and uses the same microcontroller as the entire G4X range! It is more responsive and has higher bandwidth than its G4+ Atom II predecessor. 

G4X features 512 megabytes of logging at 32bit using up to 250 channels, each limited to up to 1kHz per channel (by the Operating System), with a maximum of 100k Samples/sec.

G4X features 8 x faster communications speed, allowing you to download logs 8 x faster and pushes all the logging quickly up to a new and improved PCLink – available for download below in the features tab. 

The AtomX can control up to 2 rotors or 4 cylinders with sequential injection and direct spark. Or, it can be used for up to eight cylinders using batch fire. 

This makes it ideal for naturally aspirated engines that just need a re-tune and don't need all the extra sensors and features that come with our higher-level ECUs. 


Requires "A" loom.


The AtomX is ideal for: 

1-12 Cylinder Distributed

2-8 Cylinder Wasted Spark

1-4 Cylinder Direct Spark

Odd Fire Engines

2-Stroke Engines

Configurable Firing Order

Configurable TDC Points (for odd fire)




2 x Digital inputs

2 x Temperature inputs

3 x Analog inputs

2 x Trigger inputs



4 x Injector drives

4 x Ignition drivers

4 x Auxiliary outputs^

+5V Sensor power supply

^unused ignition drives can be used as additional Aux



1x CAN bus

1x USB tuning connection

1 x thirty-four pin, waterproof connector

Upgraded Communications Chip



Comes loaded with all of Link ECU's standard features.

512MB of logging memory

20 general-purpose tables

Runs on PC Link software for G4X



Dimensions: 90mmL x 130mmW x 45mmH (without loom)

Weight: 180 grams


What's in the box:

The AtomX ECU is supplied with a USB tuning cable, mounting bracket, and four Link ECU stickers. 


Download AtomX Quickstart Guide 

Download G4X PC Link Tuning software


Engine Configurations

1-12 Cylinder Distributed
2-8 Cylinder Wasted Spark
1-4 Cylinder Direct Spark
Odd Fire Engines
2-Stroke Engines
Configurable Firing Order
Configurable TDC Points (for odd fire)

Fueling Adjustments

Up to 440 Zone Fuel Table with configurable load and RPM centers. Configurable X and Y-Axis Parameters
Multiple Fuel Tables
Up to 6D Fuel Mapping (3D Fuel Table + #x3D Overlay trim tables
Injection Rate Control for Group Injection Modes
Master Enrichment for Traditional Fuel tuning
Pre-Crank Prime
First Crank Prime
Crank Enrichment
Post Start Enrichment
Warm Up Enrichment
Acceleration Enrichment
IAT Fuel Correction
Injector Deadtime Compensation
Injector Short Pulse Width Compensation
Injector Timing Control with Beginning / End Injection Definable
AFR Table Correction
Closed Loop Lambda
Individual Cylinder Fuel Trims
Overrun Fuel Cut
Idle Load Trims
Fuel Temperature Correction

Ignition Adjustments

Up to 440 Zone Ignition Table with configurable load and RPM centers. Configurable X and Y-Axis Parameters
Maximum Advance
Spark Duration
Dwell Time Table. Configurable X and Y-Axis Parameters
Multiple Ignition Tables
Up to 6D Ignition Mapping (3D Ignition Table + 3x3D Overlay Trim Tables)
Individual Cylinder Ignition Trim
IAT Trim
Voltage Correction
ECT Trim
OEM Compatibility
CDI Compatibility


Engine Temperature-Dependent Progressive Limiting
Vehicle Speed Limit
System Voltage Limit
User Configurable RPM Limits based on external input


Digital Trigger Decoding
Reluctor, Optical Proximity or Hall Sensors
Programmable filtering and arming thresholds
Configurable trigger patterns or preset triggering options.
Supports nearly all OEM trigger patterns and custom trigger arrangements

Motor-Sport Features

Gear Shift Control (by digital inputs only)
Use the G4X Storm for more Motorsport Features

via mini USB

Auxiliary Output Options

Each Output independently configurable
Unused ignition and Fuel outputs are available as auxiliary outputs
General Purpose Outputs
General Purpose PWM Outputs
Fuel Pump Control
Fuel Pump Speed Control
Engine Fan Control
Air Con Clutch Control
Air Con Fan Control
Intercooler Spray Control
Tacho Control
Speedo Control
Check Engine Light
Purge Solenoid
Oxygen Sensor Heater
Switched Cam Solenoid Control
ECU Hold Power Control
Shift Light Control
Starter Control


150 MHz Specialised Engine Management Microprocessor
Ignition control to 0.1 degrees, fuel to 0.01 ms
32 Bit Floating Point Calculation
12 Bit ADC Resolution
20000+ RPM
4Gb Non-Volatile Flash


4 Saturated Injector Drives (suits high impedance injectors)
4 Ignition Channels
4 Auxiliary Outputs
2 Digital Inputs
+5V Out
2 Temperature Inputs
3 0-5V Analog Inputs
2 Trigger Inputs (Reluctor, Optical or Hall Sensors)
On-Board Baro Correction (Real Time)

Analog Inputs

Each channel is independently configurable with preset or custom calibrations
Wide-band O2 (from external controller e.g. Innovate LC1)
Boost Adjust Signal
Configurable Fault Detection Settings
Throttle Position
Pressure (External MAP, BAP, general-purpose, fuel, oil)
On-Board Barometric Pressure Sensor
Air Flow Meter
Temperature (coolant, IAT, general-purpose)
Gear Detection through Analog input, CAN or RPM/Speed Calculation

Digital Inputs

Each channel is independently configurable with pull-up resistors and active state control
All digital inputs capable of reading frequencies of up to 10kHz
Duty Cycle measuring on all digital inputs
Turbo speed
Ethanol Sensor Control
Wheel Speed Detection on all digital inputs with additional general purposed speed inputs
Anti-Theft control through digital inputs, over CAN or both

Programmable Math Processing

Eight individually controllable math channels with up to four parameters in each
Math channels can be used as table axis’s and as digital or analog inputs

Boost Control

Engine Temp Correction
IAT Correction
Multiple Boost Tables
External Adjustment
Open and Closed Loop Options

Idle Control

Solenoid Control Only
Reliable and accurate user-configurable Closed Loop Control
Air Con, Engine Fan, Power Steer, Drive Idle Ups
Idle Ignition Control


Internal Temperature Range -10 - 85oC
Ambient Temperature Range -30 - 90oC
Voltage 8 - 22V
Operating Current 200mA
Electrical protection on all inputs and outputs
Onboard Barometric Pressure Sensor


Length: 79 mm
Width: 126 mm
Height: 42 mm
Weight: 360 grams
Connector: 34 Pin Waterproof Automotive


Adjust ALL parameters in real-time
Mouse or keyboard operation
QuickTune - automated fuel self-tuning
Logging Analysis
Diagnostic Information
Built-In Help
Definable Screen Layouts
View over 300 possible runtime parameters

Package Contents

USB tuning cable
Mounting Bracket
Wiring and Installation Instructions
2 large Link Stickers
2 small Link Stickers
Manufacturing Standard

ISO 13485

Additional Accessories (purchased separately)


Terminal & Plug Kit (not recommended unless you have access to the correct AMP crimper
Intake Air Temperature Sensor
3/8 NPT (Aluminium or Steel Mounting Bosses to suit)
3 Channel Link Igniter
Throttle Position Sensor
3 Channel Link Igniter
Wideband O2 Controller & Sensor
Injector Ballast Resistor Packs