Overview
Full support for Link ECU log files from G4, G4+, and G4X ECUs. Link ECUs are popular in the performance and motorsport community.
Supported File Format
- Type: Link log format (binary)
- Extension:
.llg - Source: Logged directly by Link ECU via PCLink software
- Identifier: File begins with
lf3magic bytes
No Export Required
Link ECUs log directly to LLG format via PCLink. Simply load the .llg file into UltraLog.
How to Log with PCLink
- Connect to your Link ECU with PCLink software
- Go to Logging tab
- Select channels to log
- Click Start Logging
- Drive/run the engine
- Click Stop Logging
- Save the
.llgfile
Binary Format Details
Link uses a proprietary binary format:
- Header with ECU model and software version
- Metadata section with log date/time
- Channel blocks with name, unit, and time-series data
- Data stored as f32 (value, time) pairs
- UTF-16 LE string encoding for metadata
Supported Channels
Depends on your Link ECU model and configuration. Common channels include:
Engine Parameters
- Engine RPM
- Manifold Absolute Pressure (MAP)
- Throttle Position
- Engine Load
Fuel System
- Lambda (AFR)
- Fuel Pressure
- Injector Pulse Width
- Fuel Trim
Ignition System
- Ignition Timing
- Ignition Coil Dwell
- Knock levels
Temperatures
- Coolant Temperature
- Intake Air Temperature
- Oil Temperature
- Exhaust Gas Temperature (EGT)
Pressures
- Oil Pressure
- Fuel Pressure
- Barometric Pressure
Vehicle Sensors
- Vehicle Speed
- Gear Position
- Battery Voltage
Custom Channels
- Analog Voltage inputs
- Digital inputs
- CAN bus data (if configured)
Metadata
Link log files include:
- ECU model name
- Log date and time
- Software version
- Data source information
Channel names
With field normalization on, these Link ECU names show as one standard name. From the OpenECU Alliance Link ECU LLG Binary adapter v1.1.0.
| Shown as | Unit | Names in the log |
|---|---|---|
| Engine RPM | rpm | RPM · Engine RPM · Engine Speed · Eng Speed |
| Throttle Position Main | % | TPS (Main) · TPS Main · TP Main · Throttle Position |
| Throttle Position Sub | % | TPS (Sub) · TPS Sub · TP Sub |
| Accelerator Position Main | % | AP (Main) · AP Main · Accel Position · Pedal Position |
| Accelerator Position Sub | % | AP (Sub) · AP Sub |
| Manifold Pressure | kPa | MAP · Manifold Pressure · MGP |
| Manifold Gauge Pressure | kPa | MGP · Man Press · Boost |
| Barometric Pressure | kPa | BAP · Baro · Barometric · Atmospheric Pressure |
| Lambda | λ | Lambda 1 · Lambda · Wideband · O2 Lambda |
| Lambda 2 | λ | Lambda 2 · Lambda2 |
| Air-Fuel Ratio | AFR | AFR · Air Fuel Ratio · A/F Ratio |
| Lambda Target | λ | Lambda Target · Target Lambda · CL Lambda Target |
| Injector Pulse Width | ms | Inj PW · Injection Time · Pulse Width · Inj Duty |
| Injector Duty Cycle | % | Inj DC · Injector Duty · Duty Cycle |
| Fuel Pressure | kPa | Fuel Press · Fuel Pressure · FP |
| Fuel Temperature | °C | Fuel Temp · Fuel Temperature · FT |
| Volumetric Efficiency | % | VE · Vol Eff · Volumetric Efficiency |
| Charge Temperature | °C | Charge Temp · ECT · Estimated Charge Temp |
| Ignition Timing | ° | Ign Timing · Ignition Angle · Spark Advance · Timing |
| Dwell Time | ms | Dwell · Dwell Time · Coil Dwell |
| Knock Level 1 | V | Knock Level 1 · Knock 1 · KL1 |
| Knock Level 2 | V | Knock Level 2 · Knock 2 · KL2 |
| Knock Retard | ° | Knock Retard · Knock Trim · KCS Retard |
| Engine Coolant Temperature | °C | ECT · Engine Temp · Coolant Temp · Water Temp |
| Intake Air Temperature | °C | IAT · Intake Temp · Air Temp · MAT |
| Oil Temperature | °C | Oil Temp · Engine Oil Temp · OT |
| Gearbox Temperature | °C | Gearbox Temp · Trans Temp · Diff Temp |
| Oil Pressure | kPa | Oil Press · Oil Pressure · OP |
| Battery Voltage | V | Batt V · Battery · Battery Voltage · ECU Batt |
| Vehicle Speed | kph | Speed · Vehicle Speed · VSS · Ground Speed |
| Gear Position | gear | Gear · Gear Position · Current Gear |
| Wheel Speed FL | kph | Wheel Spd FL · Wheel Speed FL · WSS FL |
| Wheel Speed FR | kph | Wheel Spd FR · Wheel Speed FR · WSS FR |
| Wheel Speed RL | kph | Wheel Spd RL · Wheel Speed RL · WSS RL |
| Wheel Speed RR | kph | Wheel Spd RR · Wheel Speed RR · WSS RR |
| Boost Target | kPa | Boost Target · Target Boost · WG Target |
| Boost Duty | % | Boost DC · WG DC · Wastegate Duty |
| VVT Intake Target | ° | VVT Int Target · Inlet Cam Target · IVT Target |
| VVT Intake Actual | ° | VVT Int Actual · Inlet Cam Pos · IVT Position |
| VVT Exhaust Target | ° | VVT Exh Target · Exhaust Cam Target · EVT Target |
| VVT Exhaust Actual | ° | VVT Exh Actual · Exhaust Cam Pos · EVT Position |
| E-Throttle Target | % | E-Thr Target · ETB Target · Throttle Target |
| E-Throttle Position | % | E-Thr Pos · ETB Position · Throttle Actual |
| Idle Target | rpm | Idle Target · Target Idle · ISC Target |
| Idle Base Position | % | Idle Base · ISC Base · Idle Position |
| Closed Loop Trim | % | CL Fuel Trim · CLL Trim · Fuel Trim · Lambda Trim |
| ECT Fuel Trim | % | ECT Fuel Trim · ECT Enrich · Warmup Enrich |
| IAT Fuel Trim | % | IAT Fuel Trim · IAT Trim |
| Traction Slip | % | Slip · Traction Slip · Wheel Slip |
| Traction Cut | % | TC Cut · Traction Cut · TCS Cut |
| Launch RPM Target | rpm | Launch Target · Launch RPM · LC Target |
| Analog Voltage 1 | V | An Volt 1 · AN1 · Analog 1 |
| Analog Voltage 2 | V | An Volt 2 · AN2 · Analog 2 |
| Analog Voltage 3 | V | An Volt 3 · AN3 · Analog 3 |
| Analog Voltage 4 | V | An Volt 4 · AN4 · Analog 4 |
| ECU Temperature | °C | ECU Temp · Internal Temp |
| Error Code | code | Error Code · Fault Code · DTC |