M8FI G7/G8 – Race ECU – HD M8 Softail – 2018-2020

Description

🏁 M8FI G7/G8 Harley Fuel Injection Controller Softail (G7 Non-Integrated or G8 Integrated)
For 2018–2020 Harley-Davidson^® M8 Softail Models

⚠️ RACE USE ONLY:  Not legal for sale or use in California or on any pollution-controlled vehicles.

The M8FI G7/G8 Harley Fuel Injection Controller is a professional-grade plug-and-play ECU engineered for closed-course competition in the King of the Baggers series. It offers a complete EFI and ignition control solution for highly modified V-Twin engines.

Notably, the M8FI ECU solves tuning challenges caused by long-duration cams and unstable MAP signals using advanced Alpha-N strategy.

💡 Key Features of the M8FI G7/G8 Harley Fuel Injection Controller

• ⚙️ Fully reprogrammable replacement ECU
• 🧠 Alpha-N fuel control (RPM + TPS) – unaffected by long duration/high overlap cams
• 🔄 Auto-Tune included – wide-band Bosch LSU 4.2 sensors for both cylinders
• 🧹 G7 = Non Integrated Modular Design – wide-band controller and USB interface are separate units
• 🧹 G8 = Integrated Design – wide-band controller and USB-C interface built into the ECU
• 🧹 G7 and G8 M8FI ECU’s function the exact same on the motorcycle
• 📊 Continuous data logging – 60 minutes at 10 samples per second
• 💻 Windows tuning & logging software (XP through 11)
• 📈 3D tables for fuel & ignition; 2D for idle and enrichment
• 🔌 User-configurable I/O – nitrous control, RPM limit, Ignition kill (in between gear, for air shifters), and more
• 🛞 Integrated Support for Cruise Control
• 🧲 Billet aluminum housing with black anodized finish
• 💪 Plug-and-play harness and installation
• 🏍️ RDRS Compatible 

⚙️ ECU Configuration Options

• 1 Bar Naturally Aspirated (105 kPa) – Utilizes the OEM MAP Sensor
• 2 Bar Turbo (210 kPa / 15 psi) – Includes 2 Bar MAP Sensor and Jumper Harness
• 2.5 Bar Turbo (265 kPa / 22 psi) – Includes 2.5 Bar MAP Sensor and Jumper Harness

📦 What’s Included

• Your choice of either a G7 or G8 M8FI ECU
• Bosch LSU 4.2 wide-band O2 sensors (front & rear)
• USB-C programming cable
• Installation & tuning guides (PDF + video)
• Access to PC_LINK & TCFI_LOG software

🧰 Software & System Requirements

• PC_LINK v23.9.56+ for tuning
• TCFI_LOG v20.001+ for logging and diagnostics
• Compatible with Windows XP, 7, 8, 10, 11
• Free download & demo mode available

📚 Documentation & Downloads

• G7 Non-Integrated ECU Startup / Setup Guide (PDF)
• G8 Integrated ECU Startup / Setup Guide (PDF)
• PC LINK Tuning Guide G7-G8-G9 (PDF)
• Software & Driver Downloads

🏁 Maximize Power with the M8FI G7/G8 Harley Fuel Injection Controller

The M8FI has been tested on engines up to 145 CID and over 250 RWHP. It comes preloaded with a base tune file for fast startup. Additionally, the integrated Auto-Tune adapts to changes on the fly. This significantly reduces dyno time by enabling real-world tuning under live conditions.

💻 Advanced Tuning via PC LINK Software

Access 3D fuel and ignition maps, 2D idle and enrichment tables, and adjust all engine parameters using the included USB-C interface. The PC LINK software provides full control of your tuning strategy, all from a Windows-based environment. All M8FI software is free to download and includes demo mode for offline training and tuning.

 

📈 Data Logging and Diagnostics

The M8FI Harley Fuel Injection Controller logs up to 60 minutes of sensor data at 10Hz. You can view real-time dashboards or chart-based playback of AFR, RPM, TPS, MAP, ignition advance, and more. Furthermore, it provides operating stats, max RPM tracking, and histogram analysis for fine-tuning and diagnostics.

Real-Time Engine Data

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🎥 M8FI G7 Non-Integrated (2017–2020) Installation Video

📸 M8FI G7 Installation Photo