1989-1997 Mazda MX5 Link Ecu G4X
Link ECU G4X Mazda MX-5 Miata NA PlugIn ECU — MX5X
Upgrade your first-generation Mazda MX-5 Miata with the Link ECU G4X MX5X PlugIn ECU. This advanced standalone engine-management system installs inside the 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 Mazda applications using the B6-series 1.6L or BP-series 1.8L engine and a two-plug factory ECU, the MX5X delivers modern engine management without requiring a complete standalone wiring harness.
FREE Link ECU USB Tuning Cable — $70 Value
Every MX5X 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.
Critical Two-Plug ECU Check
This ECU is compatible only with vehicles using the two-plug factory ECU connector.
- Two-plug ECU: Compatible with the MX5X, subject to pinout verification
- Three-plug ECU: Not compatible with this ECU
- NB, NC and ND Miata: Not compatible with this ECU
Compare your factory ECU connectors with the product photos before ordering.
Why Choose the Link G4X MX5X?
- Designed for compatible first-generation Mazda MX-5 Miata applications
- Supports B6-series 1.6L and BP-series 1.8L engines
- Supports naturally aspirated, supercharged and turbocharged builds
- Installs inside the factory OEM ECU enclosure
- Connects to the original two-plug engine wiring loom
- No complete standalone wiring harness required
- Choice of onboard 4-bar or 7-bar MAP sensor
- 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
- 1989–1997 Mazda MX-5 Miata NA with a compatible 1.6L B6-series engine
- 1989–1997 Mazda MX-5 Miata NA with a compatible 1.8L BP-series engine
- Mazda 323 GTX with a compatible two-plug ECU connector and pinout
- Mazda 323 GTR with a compatible two-plug ECU connector and pinout
- Manual-transmission vehicles only
Important Compatibility Information
- Compatible with manual-transmission vehicles only
- Requires a two-plug factory ECU connector
- Does not fit vehicles equipped with the later three-plug ECU
- Does not fit NB, NC or ND-generation Mazda MX-5 Miata models
- Compare your factory ECU connector and pinout with the product photos before ordering
- Compatibility depends on the ECU connector and pinout—not only the model year or engine
- Select the appropriate onboard 4-bar or 7-bar MAP sensor when ordering
- Knock control is not available on this ECU
- 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
- Modified vehicles and engine swaps may require additional wiring, sensors and configuration
- Professional installation and calibration are strongly recommended
G4X Engine-Management Features
- Up to 6D fuel and ignition mapping
- Sequential fuel injection where supported by the application
- 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
- Hall-effect, variable-reluctance and optical trigger-sensor support
- CAN communication
- Onboard statistics recording
- 512 MB of onboard data-logging memory
Important: Although knock control is available on some G4X ECUs, it is not available on the MX5X.
I/O Expansion Options
Expansion Connector 1
- Sensor ground
- Low-current 5V sensor supply
- Digital input 7
- Digital input 6
- Analog voltage input 5
- Analog voltage input 6
- Temperature input 4
- Temperature input 3
Expansion Connector 2
- Sensor ground
- Low-current 5V sensor supply
- Ignition output 7
- Ignition output 8
- Digital input 8
- Digital input 9
- Analog voltage input 9
- Analog voltage input 10
What’s Included
- Link ECU G4X Mazda MX5X PlugIn ECU
- Selected onboard 4-bar or 7-bar MAP sensor
- 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.