M8FI Gen 8 – Race ECU – HD M8 Softail – 2018-2020

Description

Not legal for sale or use in California or on any pollution controlled vehicles.

M8FI Gen 8 Fuel Injection Controller for 2018-2020 Harley-Davidson^® Softail Models 

· Our M8FI Racing EFI system has been designed for offroad racing use in the “King of the Baggers” racing series.

· Each Racing ECU has been designed to be a fully reprogrammable plug-in replacement ECU.

· Multiple versions are available:  1 Bar NA (105kPA)  –  2 Bar Turbo (210kPa)  –  3 Bar Turbo (315kPa)

· M8FI requires the use of version 20.4+ of the PC_LINK.exe tuning and version 19.91+ of the TCFI_LOG.exe logging software.

V20.4/19.91 has numerous updates including storing the options in the tune file and ecu.

· AUTO-TUNE is included in all of our M8FI EFI systems. Quickly adjust fuel curves on a dyno or the track with the included wide-band oxygen sensors

· Robust alpha-N (throttle position and RPM based) fuel control eliminates problems with long duration/high overlap camshafts

· Powerful Windows software for custom programming and data analysis – Windows XP/7/8/10/11

· Extended data logging and full diagnostics is included.

· Automatic datalogging continuously stores 60 minutes of operating information at 10 samples/second in an endless loop.

· Programmable user input for functions such as two stage RPM limiter, nitrous retard, and shift kill

· Programmable user output for functions such as shift light, nitrous activation, and electric shifter

· Billet aluminum housing with black anodized finish

· Easy plug and play installation

The M8FI kit includes a dual channel wide-band exhaust gas oxygen interface that allows for quick auto-tuning on a dyno or on-road during actual riding conditions. The kit includes Bosch LSU 4.2 wide-band sensors for both front and rear cylinders. The user programs a table with the desired air/fuel ratios – and the system updates the BLM tables while riding.

The M8FI solves tuning problems with highly modified engines.  Long duration/high overlap camshafts wreak havoc with manifold pressure – especially at idle and cruise RPM. Speed-density based fuel control simply can’t cope. Our system utilizes Alpha-N (throttle position and RPM based) fuel control. Alpha-N eliminates any dependence on manifold pressure and is unaffected by long duration/high overlap camshafts. The M8FI brings this proven technology to the H-D^® marketplace.

The M8FI offers full ignition control based on Manifold Pressure.  Electronic throttle control, including idle RPM and cold start characteristics are also fully programmable.

The M8FI fully supports all of the modules on your motorcycle. The built-in data logging automatically stores data for the last 60 minutes of operation at 10 samples/second. A USB interface and Windows compatible software allow the use of a laptop PC for programming and data analysis. The DTT 18014 USB interface plugs into the M8FI diagnostic connector that is built into the WEGOIIID Wideband harness.

 M8FI Installation 

Wide-Band Oxygen Sensor on Front Pipe

Wide-Band Oxygen Sensor on Rear Pipe

The M8FI is intended for high performance race engines that are expected to produce over 100 HP. The M8FI has been tested on engines up to 145 CID and over 210 RWHP. We provide setup tables that will get you up and running. From a practical standpoint, tuning any fuel injection system requires an exhaust gas analyzer. You can either spend a lot of time on a dyno with an exhaust sniffer or you can use our AUTOTUNE system.  Our system will auto-tune the fuel tables while you ride the bike on the track – you can limit the time that you spend on the dyno. Auto-tuning under actual riding conditions only takes a few hours and provides very good results. Air-cooled engines are very sensitive to thermal effects and dyno systems generally have inadequate cooling airflow.

PC Link Software for Programming Custom Advance and Fuel Tables

PC Link Tuning software runs under Microsoft Windows XP/Vista/7/8/10/11. We no longer support older Windows versions. PC Link allows the user to program all the engine control tables and parameters within the Twin  Tec M8FI system. Minimum PC requirement is a 300 MHz Pentium with super VGA display (SVGA with 1024 x 768 pixel resolution). The M8FI connects to the PC by means of a USB interface. A USB cable is supplied with the unit. The PC must have a free USB port.

3D tables are used for ignition advance and fuel control. Additional 2D tables are used for functions such as cold start enrichment and idle air control. Some sample tables are shown below.

Sample 3D Ignition Advance Table

Sample 3D Air/Fuel Ratio Table

Sample 2D Idle Speed Table

Sample Engine Control Parameters Screen

The M8FI also features a user input and user output that can serve various functions. The user input can be configured for data logging (such as the status of a switch), ignition retard, ignition kill (for air shifter), or stage RPM limit. The user output can drive a relay and be configured as a general purpose RPM and throttle position based switch or to trigger an NOS system.

User Functions Screen

PC Link software is free! You can always download the latest version of the software and instructions (contained within the M8FI Installation & Tuning Manual) from our website. The software will run in demo mode without a M8FI system attached. For your convenience, we include all of our software online for you to download at anytime. Refer to the links above or go to our software page.

M8FI Data Logging Software

The M8FI features comprehensive data logging capability. During dyno testing, you can display real time engine data on an instrument panel type screen. The M8FI stores data for the last 60 minutes of operation at 10 samples/second. You can download and display this data on a chart recorder type screen. Data is available for all sensor inputs and output functions. The M8FI data logging capability greatly facilitates fine tuning and diagnosis of driveability issues. The data logging software, M8FI Log, has the same PC requirements as described above for  the PC Link software. For more detailed information, we suggest that you download the M8FI Log software and instructions. The software download includes a sample file with actual data.

Real Time Engine Data Display

Data Logging Chart Display

The data logging software also allows you to download operating statistics and historical diagnostic codes.  Downloaded operating statistics are displayed as shown below. Total hours represents the total time that the engine was running. ID represents the firmware identification. This field typically includes the manufacturer (Twin Tec), model number, program revision and author’s initials, and date. Elapsed time is displayed for 13 RPM bands from idle to 6999 RPM. The utility also displays the maximum engine RPM, time at the RPM limit (in seconds for better resolution) and the number of engine starts. All this data can be printed to provide a permanent record. The data stored in the module for maximum engine RPM and time at the RPM limit  can be cleared. All other elapsed time and engine starts data is permanent.

Any historical diagnostic codes logged by the M8FI are listed along with the number of trips (engine start cycles) since the individual code was last logged. The software can also clear diagnostic codes.

Operating Statistics Data

The elapsed time data in the various RPM bands can be displayed in the form of a histogram chart by clicking on the Histogram button. Clicking on this button causes the chart shown below  to appear. Color coding of the bars helps to interpret the data. The idle RPM band is blue, normal operating RPM bands are green and high RPM bands are yellow and red. The chart is automatically scaled for best display.

M8FI Log software is free! You can always download the latest version of the software and instructions (contained within the M8FI Installation & Tuning Manual) from our website. The software will run in demo mode without a M8FI system attached. For your convenience, we include all of our software online for you to download at anytime. Refer to the links above or go to our software page.