Link G4X GTTLink NGTTX ECU

The Link G4X GTTLink NGTTX ECU is a direct-fit engine management system designed for Nissan RB-series engines using the grey plug ECU, typically found on NEO engines. It installs into the factory ECU enclosure and connects directly to the OEM wiring loom on supported vehicles.

This ECU is intended for manual transmission vehicles only and supports most factory systems while providing advanced tuning capability through the G4X platform.

Important: Manual transmission only. Designed for RB NEO engine applications using the grey plug ECU. E-throttle requires modification before use. Please confirm your ECU connector matches the header shown in the product images before purchase.

Notes: This ECU does not output the 4WD signal required for proper 4WD operation in Stagea and Skyline 4WD models. Factory traction control (TCS) is not supported and warning lamps will be illuminated.

Engine Control Capability

• Designed for RB20DE NEO, RB25DE NEO, and RB25DET NEO engines
• Sequential fuel injection
• Digital triggering using OEM patterns
• Precision closed loop cam control
• Staged injection support
• Knock control with windowing

Hardware and Platform

• Direct plug-in installation using factory ECU enclosure
• Continuous onboard barometric correction
• USB tuning connection
• CAN communication support
• 512 MB onboard data logging

Vehicle Compatibility

• Nissan R34 Skyline with RB20DE NEO, RB25DE NEO, or RB25DET NEO
• Nissan C35 Laurel with RB20DE NEO, RB25DE NEO, or RB25DET NEO
• Nissan Stagea with RB20DE NEO, RB25DE NEO, or RB25DET NEO
• Also supports non-NEO RB engines in Stagea platforms
• Manual transmission only

G4X Plug-In Key Features

• Up to 6D fuel and ignition mapping
• Sequential fuel delivery
• OEM idle control supported
• 5D boost control with three switchable tables
• Launch control, anti lag, and flat shift
• Individual cylinder fuel and ignition correction
• Gear-based fuel, ignition, and boost compensation
• QuickTune automated fuel tuning
• Selectable dual fuel, ignition, and boost maps
• CAN communication support

I/O Expansion

Expansion Connector 1

• SGnd – Sensor ground
• +5V Out – Low current +5V supply
• DI7 – Digital input
• DI8 – Digital input
• Analogue Voltage 10 (0–5V)
• Analogue Voltage 9 (0–5V)
• Ign 7 – Ignition auxiliary output
• Ign 8 – Ignition auxiliary output

Expansion Connector 2

• SGnd – Sensor ground
• +5V Out – Low current +5V supply
• DI5 – Digital input
• DI6 – Digital input
• Analogue Voltage 5 (0–5V)
• Analogue Voltage 6 (0–5V)
• Analogue Temperature 2
• Analogue Temperature 3

Note: Pin 108 (OBD1 wire) is now used for intake air temperature on Analogue Temperature 4.

Downloads and Resources

• Installation Manual (PDF)

View all Link ECU Resources