Link G4X AtomX 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 — the AtomX has expanded data logging and uses the same microcontroller as the entire G4X range!
It’s more responsive and has higher bandwidth than its G4+ Atom II predecessor.

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Key Performance Features

• 512MB logging at 32-bit using up to 250 channels (max 1kHz per channel)
  → Total: up to 100 kSamples/sec

• 8× faster communication speed for quicker log downloads

• Works with the new & improved PCLink software (downloadable below)

• Controls up to 2 rotors or 4 cylinders with sequential injection and direct spark

• Ideal for naturally aspirated engines needing a re-tune without extra sensors or advanced features

• Requires “A” loom

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Specifications

Inputs

• 2 × Digital inputs

• 2 × Temperature inputs

• 3 × Analog inputs

• 2 × Trigger inputs

Outputs

• 4 × Injector drives

• 4 × Ignition drivers

• 4 × Auxiliary outputs

• +5V Sensor power supply

^ Unused ignition drives can be reassigned as auxiliary outputs

Communications

• 1 × CAN bus

• 1 × USB tuning connection

• 1 × 34-pin waterproof connector

• Upgraded communications chip

Miscellaneous

• Loaded with all standard Link ECU features

• 512MB of logging memory

• 20 general-purpose tables

• Runs on PCLink software for G4X

Physical

• Dimensions: 90mm (L) × 130mm (W) × 45mm (H) (without loom)

• Weight: 180g

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What’s in the Box

• AtomX ECU

• USB tuning cable

• Mounting bracket

• Four Link ECU stickers

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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)

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Fueling Adjustments

• Up to 440-zone fuel table (configurable load & RPM centers)

• Multiple fuel tables

• Up to 6D fuel mapping (3D table + 3×3D trim overlays)

• Injection rate control for group injection modes

• Master enrichment (traditional tuning)

• Pre-crank, first crank, and post-start enrichment

• Warm-up, acceleration, and IAT corrections

• Injector deadtime & short pulse width compensation

• Injector timing (beginning/end definable)

• AFR correction & closed-loop lambda

• Individual cylinder trims

• Overrun fuel cut, idle trims, fuel temp correction

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Ignition Adjustments

• Up to 440-zone ignition table (configurable load & RPM centers)

• Maximum advance & spark duration

• Dwell time table (configurable axes)

• Multiple ignition tables

• Up to 6D ignition mapping (3D table + 3×3D trim overlays)

• Individual cylinder ignition trim

• IAT, voltage, and ECT corrections

• OEM & CDI compatibility

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Limits

• Engine temp-dependent progressive limiting

• Vehicle speed limit

• System voltage limit

• User-configurable RPM limits (based on external input)

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Triggering

• Digital trigger decoding

• Supports reluctor, optical proximity, or Hall sensors

• Programmable filtering & arming thresholds

• Configurable or preset trigger patterns

• Compatible with most OEM & custom trigger setups

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Motorsport Features

• Gear shift control (via digital inputs only)

For more motorsport features, use the G4X Storm

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Communications

• Mini USB connection

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Auxiliary Output Options

• Each output independently configurable

• Unused ignition/fuel outputs usable as auxiliary

• Supports general-purpose & PWM outputs

Available Controls:

• Fuel pump (incl. speed)

• Engine fan

• Air con clutch/fan

• Intercooler spray

• Tacho & speedo

• Check engine light

• Purge solenoid

• O2 sensor heater

• Cam solenoid

• ECU hold power

• Shift light

• Starter motor

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Processing

• 150MHz specialised engine management microprocessor

• Ignition control to 0.1°, fuel control to 0.01ms

• 32-bit floating point calculation

• 12-bit ADC resolution

• 20,000+ RPM capability

• 4GB non-volatile flash memory

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Inputs / Outputs Summary

• 4 × Saturated injector drives (high impedance)

• 4 × Ignition channels

• 4 × Auxiliary outputs

• 2 × Digital inputs

• +5V out

• 2 × Temp inputs

• 3 × Analog inputs (0–5V)

• 2 × Trigger inputs (Reluctor, Optical, or Hall)

• Onboard barometric correction (real-time)

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Analog Inputs

• Independently configurable channels with preset/custom calibrations

• Supports wideband O₂ (via external controller)

• Configurable fault detection

• Inputs for throttle, pressure (MAP/BAP/fuel/oil), baro sensor, airflow meter, temperature (coolant/IAT/general), and gear detection

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Digital Inputs

• Independently configurable with pull-up resistors & active state control

• Frequency reading up to 10kHz

• Duty cycle measurement on all inputs

• Supports:

  • Turbo speed

  • Ethanol sensor control

  • Wheel speed detection

  • Anti-theft control (digital or CAN)

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Programmable Math Processing

• 8 math channels, each with up to 4 parameters

• Usable as table axes or digital/analog inputs

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Boost Control

• Engine temp & IAT correction

• Multiple boost tables

• External boost adjustment

• Open-loop boost control

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Idle Control

• Solenoid control only

• User-configurable closed-loop idle

• A/C, fan, and power-steering idle up

• Idle ignition control

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Environmental Tolerances

• Internal temp: -10°C to 85°C

• Ambient temp: -30°C to 90°C

• Voltage: 8–22V

• Operating current: 200mA

• Electrical protection on all I/O

• Onboard barometric pressure sensor

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Physical Specs

• Length: 79mm

• Width: 126mm

• Height: 42mm

• Weight: 360g

• Connector: 34-pin waterproof automotive

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PCLink Software

• Adjust all parameters in real time

• Mouse or keyboard operation

• Automated fuel self-tuning (QuickTune)

• Logging & diagnostic tools

• Built-in help & definable layouts

• View over 300 runtime parameters

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Package Contents

• G4X AtomX ECU

• USB tuning cable

• Mounting bracket

• Installation instructions

• 2 × large Link stickers

• 2 × small Link stickers

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Manufacturing Standard

ISO 13485