1993+ Toyota MR2 3SGTE Link Ecu G4X
Link ECU G4X Toyota 3S-GTE PlugIn ECU — TST205X
Upgrade your Toyota MR2 or Celica GT-Four with the Link ECU G4X TST205X PlugIn ECU. This advanced standalone engine-management system installs inside the compatible factory ECU enclosure and connects to the original wiring loom, giving you complete control over fuel, ignition, boost and advanced motorsport functions.
Designed for compatible Toyota applications equipped with the 3S-GTE engine, the TST205X delivers modern engine-management capabilities without requiring a complete standalone wiring harness.
FREE Link ECU USB Tuning Cable — $70 Value
Every TST205X purchased from Kugan Tuning includes a compatible Link ECU USB tuning cable at no additional cost. Connect your laptop directly to the ECU for configuration, diagnostics, data logging and professional tuning.
Why Choose the Link G4X TST205X?
- Designed for compatible Toyota 3S-GTE applications
- Installs inside the compatible factory OEM ECU enclosure
- Connects to the original engine wiring loom
- No complete standalone wiring harness required
- Advanced fuel, ignition and boost control
- Launch control, anti-lag and flat-shift capability
- Expandable inputs and outputs
- CAN communication
- 512 MB of onboard data-logging memory
- FREE Link ECU USB tuning cable included—a $70 value
- FREE Kugan Tuning remote setup support included—a $297 value
Suitable Applications
- 1993 and newer Toyota MR2 with a Gen 3 3S-GTE engine
- Toyota Celica ST205 GT-Four
- Toyota Celica Carlos Sainz Edition
- Toyota Celica GT-Four RC
- Toyota Celica Group A Rallye
Important Compatibility Information
- Compatible with manual-transmission vehicles only
- Not compatible with Red Top 3S-GE BEAMS applications
- Compare your factory ECU connector and pinout with the product photos before ordering
- Compatibility depends on the factory ECU connector and pinout—not only the vehicle’s engine or model year
- The ECU board does not fit inside the original ECU enclosure from non-turbo vehicles
- Non-turbo vehicles and engine swaps may require an alternative enclosure, mounting solution and additional wiring
- Electronic-throttle operation requires an ECU modification before it can be used
- Most factory vehicle functions are supported, but availability can vary by model and configuration
- Professional installation and calibration are strongly recommended
G4X Engine-Management Features
- Up to 6D fuel and ignition mapping
- Sequential fuel injection
- Precision closed-loop camshaft control where applicable
- Digital triggering with support for OEM trigger patterns
- OEM idle-control hardware support
- 5D boost control with three switchable tables
- Boost control based on gear, vehicle speed or throttle position
- Launch control
- Anti-lag
- Flat-shift control
- QuickTune automated fuel tuning
- Individual-cylinder correction
- Gear-based fuel, ignition and boost compensation
- Real-time selectable fuel, ignition and boost maps
- Continuous onboard barometric correction
- Staged injection
- Knock control with configurable knock windows
- Hall-effect, variable-reluctance and optical trigger-sensor support
- CAN communication
- Onboard statistics recording
- 512 MB of onboard data-logging memory
I/O Expansion Options
Expansion Connector 1
- Sensor ground
- Low-current 5V sensor supply
- Digital input 5
- Digital input 6
- Digital input 4
- Analog voltage input 7
- Analog voltage input 5
- Analog voltage input 6
Expansion Connector 2
- Ignition output 5
- Ignition output 6
- Ignition output 7
- Ignition output 8
- Digital input 9
- Digital input 10
- Analog voltage input 8
- Analog voltage input 9
What’s Included
- Link ECU G4X Toyota TST205X PlugIn ECU
- FREE Link ECU USB tuning cable—a $70 value
- FREE Kugan Tuning remote setup support—a $297 value
FREE Remote Setup Support — $297 Value
Purchase your Link ECU from Kugan Tuning and receive complimentary remote setup support to help prepare the ECU and vehicle for startup and professional tuning.
Remote setup support includes:
- Remote ECU connection and setup assistance
- Basemap selection guidance
- Initial ECU configuration assistance
- Startup configuration review
- Sensor and input verification
- Guidance preparing the vehicle for professional tuning
This support helps identify configuration and sensor problems early, reducing unnecessary troubleshooting and wasted dyno time.
Custom remote tuning and dyno tuning are not included unless separately purchased. Successful startup and vehicle operation depend on correct compatibility, installation, wiring, mechanical condition and ECU calibration.