Contact us at 888-OBD-TUNE (888-623-8863)    

Hours: Mon-Thur 9AM to 6PM, Fri 9AM-5PM, Sat/Sun by Appointment Only     

1958 East Walnut Street    
Unit D     
Columbus, Ohio 43205    

  Shop ServicesBrandsSearchContact UsAboutSite MapPrivacyTermsCheckout              

Dealer Inquiry (dealers ONLY please)

Home » Link ECU

Product ID: Link-Atom
Link Atom G4+ ECU
Link Atom G4+ ECU
Untitled 1

The G4+ Atom runs the same microprocessor and firmware as our top ECU, the G4+ Xtreme

Designed and built to be the best "value for money" entry level ECU on the market.

While the G4+ Atom is entry level, the following is not compromised:

  • The loom is AVSS automotive quality cable the same as is used in 21st century car manufacturing
  • The same mounting technology as our higher level ECUs
    • A fully extruded mounting plate is included
    • Mounting hardware is completely hidden for a fully professional installation
  • Waterproof automotive plugs
  • The same tuning features as our high-end ECUs - tuning is not compromised in this "entry level" ECU
  • Full configurability, no preset input/outputs
  • Logging, even closed loop fuel and knock if external devices are added (WideBand Controller & G4 KnockBlock)
  • Industry standard waterproof connectors, mounting bracket and loom, all supplied with your G4 Atom
  • Spec overview:
    • Four injection drives
    • Four ignition outputs
    • Three analog inputs (you choose, oil pressure etc.)
    • Two temperature inputs (usually water and inlet air temperature)
    • Two digital inputs (e.g. vehicle speed and logging switch - you choose)
    • Four auxiliary outputs (e.g. fuel pump, fans, boost control, O2 heater etc.) *
    • One, thirty four pin, waterproof connector
    • 5V out


G4+ Atom Key Improvements

  • Updated to latest hardware designs
  • Upgraded microcontroller
  • Now uses 34 pin connector and same pinout as the G4+ Storm
  • Reduced cost build to reduce retail price
  • MAP sensor not fitted internally
  • Additional An Volt channel for wiring MAP sensor
  • USB tuning USB Mini connector
  • CAN is wired to main connector

G4 Atom Key Features

  • Built in 2.5 bar MAP sensor
    • 2.5 bar absolute, 1.5 bar of boost
    • External MAP sensors available up to 7 bar
  • Up to 6D fuel and ignition mapping
  • Sequential fuel and ignition delivery
  • Digital triggering, all common OEM patterns
  • OEM idle hardware supported - not stepper motors use the G4 Storm
  • 5D boost control with three switchable tables
  • Continuous barometric correction (on board)
  • QuickTune - automated fuel tuning
  • Individual cylinder correction for fuel trimming and ignition timing (3D correction tables available for fuel and ignition optimisation)
  • Odd-fire engines & two-strokes
  • Stats recording into on-board memory
  • Gear compensations tables, user selectable e.g. spark, boost etc.
  • Real time selectable dual fuel, ignition and boost maps
  • Sync and crank sensors can be a combination of Hall effect, variable reluctance or optical
  • Boost control referenced to gear, speed or throttle position
  • Up to 512k internal logging memory
  • Staged injection
  • Firmware updates available online (
  • Brief Specification:

    • Four injection drives
    • Four ignition outputs
    • Three analog inputs (you choose, oil pressure etc.)
    • Two temperature inputs (usually water and inlet air temperature)
    • Two digital inputs (e.g. vehicle speed and logging switch - you choose)
    • Four auxiliary outputs (e.g. fuel pump, fans, boost control, O2 heater etc.)
    • One, twenty six pin, waterproof connector
    • Built in, 2.5 bar, MAP sensor
    • 5V out

On Board Data Logging

The latest G4 firmware version enables the ECUs on board data logging functionality.  On board data logging is an essential feature for tuning and motor-sport diagnostics.  On board data logging allows ECU information to be recorded directly to memory inside the ECU.  Recorded information can be retrieved for analysis at a later stage.

All G4 Atoms are built with 512k flash memory. The ECU can be configured to record a large number of parameters at various rates.  High capacity memory allows for recording of approximately 100 parameters at a rate of 50 times per second for nearly 120 seconds. Slower rates allow for over 80 minutes of recording time.

The ECU can be configured to start recording when an external switch is turned on or based on some internal condition.  Log files are independently recorded and can be retrieved without downloading the entire ECU memory.

Quick Tune

Using PCLink, QuickTune is an interactive tuning tool that assists in time efficient fuel tuning.

A graphical display of Target AFR (desired AFR) and Actual AFR (measured AFR) is provided.   A dual pointer gauge allows the tuner to quickly see how close Actual AFR is to the Target AFR.  QuickTune can be setup to operate over the entire fuel table or just over a particular area.

QuickTune can be used in Manual or Automatic modes.  In Manual mode, QuickTune guides you to cell centering and advises you when is a suitable time to make a fuel table adjustment.   With the press of a key a calculated adjustment is made.  Often only one or two adjustments are required to tune each cell.  In Automatic mode QuickTune does all the adjustments for you.   This leaves the tuner free to operate the Dyno or perform other tuning work such as making ignition or cam angle adjustments.

Up to Six Dimensions of Fuel & Ignition Tuning

Under most circumstances a 3D Fuel Table is sufficient. RPM is typically used for one axis with load (typically represented by MAP or MGP) on another axis.  The 3rd axis/dimension is the fuel zone value.

This 3D mapping will be very familiar to the average tuner and a 3D surface representing the fueling can be easily visualised or physically displayed by selecting Surface Graph.

In special cases 3D mapping may not be adequately flexible to cope with all operating parameters.

Multi-throttle, turbo charged engines typically show an example of this.  With the throttle wide-open at a MAP value of, for example,  200kPa and an engine speed of 5000rpm the engine will have considerably different fueling requirements than with the throttle half open and the same MAP and engine speed.  In this case the 4D Fuel Table table may be used.  This second table may be spanned using throttle position on the load axis.

When a 4D/5D table is turned on, its Table Activation mode can be selected.  This allows the 4D or 5D Fuel Table to become active only under certain conditions.  This is useful if an external switch or switching output is required to activate the table (e.g. switching in the 4D Fuel Table and ignition when the nitrous solenoid becomes active).  If the table is required to be always active, set this adjustment to Always ON.

As with all tables, 4D and 5D Fuel Tables can have their X and Y axis parameters selected and their row/column locations adjusted.  To do this, click on the table and press X or Y.


Engine Configurations

  • 2-12 Cylinder Distributed
  • 2-8 Cylinder Wasted Spark
  • 2-4 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
  • Injection Rate
  • Master Enrichment
  • Pre-Crank Prime
  • Crank Enrichment
  • Post Start Enrichment
  • Warm Up Enrichment
  • Acceleration Enrichment
  • IAT Fuel Correction
  • Injector Deadtime Compensation
  • 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
  • Closed Loop Knock Control.  (Requires External Link G4 KnockBlock)
  • Crank Dwell Extension
  • Maximum Advance
  • AFR Table Correction
  • Spark Duration
  • Beginning / End Injection Definable
  • Dwell Time Table.  Configurable X and Y Axis Parameters
  • Individual Cylinder Trim
  • Individual Cylinder Tables
  • Multiple Ignition Tables
  • Up to 6D Ignition Mapping
  • 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 Limit 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


  • Serial RS232 via adapter cable available separately
  • CAN - Connector and replacement front plate available separately

Auxiliary Output Options

  • Each Output independently configurable
  • Unused ignition outputs available as auxiliary outputs
  • General Purpose Output
  • General Purpose PWM
  • Closed Loop Idle Speed Control (Solenoid only)
  • Fuel Pump
  • Fuel Pump Speed Control
  • Engine Fan
  • Air Con Clutch
  • Air Con Fan
  • Intercooler Spray
  • Tacho
  • Check Engine Light
  • Purge Solenoid
  • Oxygen Sensor Heater
  • Switched Cam Solenoid


  • 40 MHz Specialised Engine Management Microprocessor
  • Ignition control to 0.1 degree, fuel to 0.01 ms
  • 32 Bit Calculation
  • 10 Bit ADC Resolution
  • 20000+ RPM
  • 4Mb Non Volatile Flash


  • 4 High Current Injector Drives
  • 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 independently configurable with preset or custom calibrations
  • Wide-band O2 (from external controller e.g. Innovate LC1)
  • Boost Adjust Signal
  • Configurable Fault Detection Settings
  • Voltage (0-5V)
  • Pyro (from external controller)
  • Throttle Position
  • Pressure (general purpose, fuel, oil)
  • Air Flow Meter
  • MAP (external)
  • Temperature (coolant, IAT, general purpose)
  • Narrow Band O2

Boost Control

  • Engine Temp Correction
  • IAT Correction
  • Multiple Boost Tables
  • External Adjustment

Idle Control

  • Reliable and accurate user configurable Closed Loop Control
  • Solenoid or Uni-polar 6 terminal stepper only. If 4 wire stepper control is required use the G4 Storm
  • Aircon, Engine Fan or Power Steer idle up
  • Open Loop Control Mode for diagnostics


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


  • Length: 79 mm
  • Width: 126 mm
  • Height: 42 mm
  • Weight: 360 grams
  • Connector : 26 Pin Waterproof Automotive
  • Adjust ALL parameters in real time
  • Mouse or keyboard operation
  • Tuning
  • QuickTune - automated fuel self tuning
  • Logging Analysis
  • Diagnostic Information
  • Built In Help
  • Definable Screen Layouts
  • View over 300 possible runtime parameters

Package Contents

  • G4 Atom ECU
  • Mounting Brackets and Screws
  • Wiring and Installation Instructions
  • 2 large Link Stickers
  • 2 small Link Stickers

Manufacturing Standard

  • ISO 13485

Additional Accessories

 (Purchased Separately)
  • Looms
    • Terminal and plug kit - not recommended unless you have access to the correct AMP crimper
    • 250 mm loom
    • 2.5m loom (included in purchase price)
    • 5m loom (ideal for boat installations)
  • Intake Air Temperature Sensor
    • 3/8 NPT
    • Bosch push in
    • 14mm (Aluminium or Steel Mounting Bosses to suit)
  • Throttle Position Sensor
  • 2 or 3 Channel Link Igniter
  • Narrowband Oxygen Sensor
  • Wideband O2 Controller & Sensor
  • Injector Ballast Resistor Packs
    • 1 x 1R (6 x <6R injectors)
    • 2 x 1R (12 x <6R injectors)
    • 1 x 4R7 (1 x <6R injectors)
    • 2 x 4R7 (2 x <6R injectors)
    • 1 x 2R2 (1 x <3R injectors)
    • 2 x 2R2 (2 x <3R injectors)
    • 4 x 4R7 (4 x <6R injectors)
    • 6 x 4R7 (6 x <6R injectors)


List Price: $815.45
Price: $815.45

« Previous | Next »


Products Available at

2014 Chevy/GMC Duramax is tuned!  +81 HP & +170 ft/lb of torque!

Jeep Wrangler JK 3.6L 2012-2014 is now tuned!

Harley Davidson Tuner!
The Vigilante

Autoland Scientech
Diagnosis Online Solutions
Now Available!

Toyota Tundra Tuning!
Tacoma, Sequoia, & 4Runner
Up to 30 HP!

LC-1 Wideband Clearance Sale!  $147.50

2013 Dodge, Chrysler, & Jeep 3.6L, 5.7L & 6.4L Tuned!

Diablosport has tuned the 2014 Camaro SS!

Tuner Tools Facebook PageTuner Tools on TwitterTuner Tools on Linked In
Tuner Tools LLC
Contact Us





home - site map - search - brands - about us - contact - privacy - terms of service - cart

Tuner Tools Affiliates: Access your account here
Copyright 2006-2016 Tuner Tools LLC - All Rights Reserved Worldwide