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Link ECU G4X TTLink AUDI TT PlugIn ECU fits the VWAG PQ34 1.8l Turbo E-Throttle
Link ECU G4X TTLink AUDI TT PlugIn ECU fits the VWAG PQ34 1.8l Turbo E-Throttle
Link ECU G4X TTLink AUDI TT PlugIn ECU fits the VWAG PQ34 1.8l Turbo E-Throttle
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Link ECU G4X TTLink AUDI TT PlugIn ECU fits the VWAG PQ34 1.8l Turbo E-Throttle



    Free yourself from the constraints of the factory ECU. 

    The Link G4X ECU: TTLink TTX PlugIn fits the VWAG PQ34 1.8l Turbo e-throttle. The Audi ECU is a direct fit in the factory location. 

    Installation is a breeze with no alteration of the factory wiring loom required. A built-in connector (or pins in some models) provides additional inputs and outputs such as oil pressure inputs or anti-lag / logging switches. 

    Most factory features are supported.

    Includes Integrated 4 Bar MAP Sensor

    G4X Plugin Key Features (Where Applicable)

    • Up to 6D fuel and ignition mapping
    • Precision closed loop cam control (four cam, independent control)
    • Sequential fuel delivery
    • Digital triggering, all OEM patterns
    • OEM idle hardware supported
    • 5D boost control with three switchable tables
    • Motorsport features - antilag, launch, flat shift
    • Continuous barometric correction (on board)
    • CAN port
    • QuickTune - automated fuel tuning
    • Individual cylinder correction
    • USB tuning cable included
    • Stats recording into on-board memory
    • Gear compensations for spark, boost and fuel
    • 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
    • 512 MB data logging capability 
    • Staged injection
    • Knock with "windowing"

    The PlugIn ECU is capable of the following features, if the car it is being used in can support them.

    Engine configurations are pre-set into PlugIn ECUs with a "start" base map.

    Engine Configurations

    1-12 Cylinder Distributed

    2-12 Cylinder Wasted Spark

    1-8 Cylinder Direct Spark

    Odd Fire Engines

    2-Stroke, 4 Stroke and Rotary Engines

    Configurable Firing Order

    Configurable TDC Points (for odd fire)


    8 x High Current Injector Drives (suits high impedance injectors)

    8 x Auxiliary Outputs (All PWM capable). Aux5-8 can control Stepper Motors and drive High or Low

    11 Digital Inputs (All capable of reading frequencies up to 10kHz)

    +5V Out

    +8V Out

    4 Temperature Inputs (Configurable pull-ups on ANT1&2)

    12 x 0-5V Analog Inputs

    2 x Trigger Inputs (Reluctor, Optical or Hall Sensors)

    On Board Baro

    3 Axis Accelerometer

    Fueling adjustments

    Traditional, Modelled and Modelled Multi-Fuel Equations

    Single-Point Group, Multi-Point Group, Sequential, Semi-Sequential, Group Staged, Sequential Staged and Sequential/Multi Point Group Staged injection modes

    Asynchronous injection (can add more fuel after initial injection if conditions change)

    Quick tune (automated fuel tuning)

    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 + 3x3D 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, Middle or End Injection Definable

    AFR Table Correction

    Dual Closed Loop Lambda

    Individual Cylinder Fuel Trims

    Overrun Fuel Cut

    Idle Load Trims

    Fuel Temperature Correction

    Barometric pressure compensation

    Injector test function

    Ignition Adjustments

    Distributor, Twin Distributor, Wasted Spark, Direct Spark, Rotary leading Wasted and Rotary

    Leading Direct Ignition Modes

    Up to 440 Zone Ignition Table with configurable load and RPM centers. Configurable X and Y Axis Parameters

    Configurable Maximum Advance

    Configurable Spark Duration

    Configurable Spark Edge

    Dwell Time Table with 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

    Transient ignition retard

    Adjustable ignition delay compensation

    Ignition test function

    Idle ignition control


    Engine Temperature Dependent Progressive Limiting

    Dual Vehicle Speed Limits

    System Voltage Limit

    User Configurable RPM Limits based on external input

    MAP Limit with dual tables

    Optional hard cut

    Progressive cut control

    Selectable fuel or ignition limiting

    Ignition trim and configurable trim decay

    Adjustable control range

    Selectable cut effect (adaptive or constant)

    Auxiliary Output Options

    Each Output independently configurable

    Unused ignition and Fuel outputs 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

    VVT Cam Solenoid

    Boost Control Solenoid

    Test functions for each output

    Closed loop Stepper Control & Rotary Oil Pump Control

    Idle Speed Soloenoid

    Idle Speed Stepper

    Internal Ethrottle Controller

    External EThrottle

    Digital Inputs

    Each channel 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-purpose speed inputs

    Anti-Theft control through digital inputs, over CAN or both

    General Purpose switches, speeds, rpms and frequencies

    large variety of input types

    Analog Inputs

    Each input independently configurable with preset or custom calibrations and configurable fault conditions

    Built in 3 axis accelerometer

    Built in Barometric Pressure Sensor

    Large variety of Analog input functions

    General Purpose Temperatures, Pressures, Rotary Switches and more

    Built in Wideband Controller

    Analog Inputs can also be used as Digital Inputs

    Large number of built in calibrations

    Ten Calibration Tables and 3 Linear Calibrations for when a custom calibration is required


    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

    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

    Motor-Sport Features

    Anti Lag

    Launch control

    Gear Shift Control (Digital Inputs, Gear Lever Force or Gear Barrel Position)

    Traction control

    Anti-Lag System

    Dual 3D Fuel enrichment, Ignition cut and Ignition retard Tables

    Optional Cyclic idle (normal and cool-down)

    Optional 3D Idle controller Override Tables (one for Antilag and one for Cyclic Idle)

    Lockout condiitons based on engine speed and throttle position with hysteresis

    Launch Control

    Single RPM, 3D RPM Table or Latched (RPM when button pressed) Launch modes

    Progressive cut control

    Selectable fuel or ignition limiting

    Selectable cut effect (adaptive or constant)

    Adjustable control range

    Vehicle speed controlled

    Ignition Trim with optional 3D table and relative or absolute ignition angle options

    Optional 3D Fuel Trim table

    Gear Shift Control

    Digital input (clutch switch), gear lever force (sequential gearbox), gear lever force (H pattern gearbox), and gear barrel position sensor input options

    Timed or controlled modes

    Adjustable progressive cut levels

    Power re-introduction control

    Ignition retard control

    Fuel enrichment control

    Cut duration based on gear

    Traction Control

    Disable switch

    Various Lockout conditions

    Multiple 3D slip Threshold tables

    Traction Control - controlled tyre slip to improve vehicle safety and driveability

    Uses an advanced Torque Management system to reduce engine torque

    Idle Control

    Solenoid, Stepper or EThrottle Control

    Open or Closed loop actuator control and Closed loop Ignition control available

    Large variety of position offsets for open loop and additional target offsets for closed loop actuator control

    Specific start-up offsets and hold times

    Dashpot functionality to smooth re-entry into idle and prevent undershoot

    Electronic Throttle Control

    Has an internal EThrottle Controller and supports external controllers

    Multiple 3D target tables

    Boost Control

    Open or Closed Loop Boost Control

    Multiple Target and Base Position Tables

    Multiple Trim tables

    Boost by Gear control

    Knock Control

    2 Built in Knock inputs

    Fuel Enrichment and Ignition Retard functionality

    Adjustable frequency filter

    Adjustable gain (per cylinder)

    Individual cylinder detection

    Individual cylinder ignition retard and fuel enrich

    Adjustable detection angle (start/end)

    Noise threshold table (3D)

    Adjustable ignition retard and fuel enrich sensitivity

    Configurable ignition reintroduction and fuel enrich decay

    Variable Valve Timing Control

    Up to 4 cams independent control

    Supports many OEM applications

    Closed loop control

    Multiple 3D Cam angle target tables

    Optional advanced PID control settings for advanced tuners

    Automatic function for calibrating cam angles

    Chassis and Body

    AC Control - Basic and Advanced modes available

    AntiTheft - Via Digital Input, CAN or both

    Speed based cruise control (EThrottle only)

    Gear Detection - CAN, RPM/Speed or Analog Position Sensor

    Individual wheel speed sources with the ability to specify Driving and Non-Driving wheel speed sources

    Starter control - Multiple options available from very basic to Touch to start.

    Torque Management


    512Mb of 32bit Internal logging memory

    Up to 250 ECU Logging channels

    Up to 1kHz per channel with a maximum total sample rate of 100kSamples/s when using ECU Logging

    Unlimited channels when using PCLink logging


    Tuning Port USB on board

    Two CAN buses

    Custom CAN configuration allowing tuners and end users to add support for new CAN devices


    150 MHz Specialised Engine Management Microprocessor

    Ignition control to 0.1 degree, fuel to 0.01 ms

    32 Bit Floating Point Calculation

    12 Bit ADC Resolution

    20000+ RPM

    4Gb Non Volatile Flash


    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

    Packaging Contents

    G4X PlugInX ECU

    Wiring and Installation Instructions

    2 large Link Stickers

    2 small Link Stickers

    Manufacturing Standard – ISO 13485