TCFI Gen III Fuel Injection Controller for 2001-2009 Twin-Cam with Delphi^® System

 

· Simultaneously auto-tune fuel curves for front and rear cylinders under actual riding conditions with new WEGO IIID dual channel wide-band oxygen sensor interface

· Fully programmable plug-in replacement for 36 pin Delphi^® controller used on 2001-2009 models. Not compatible with 2008-2009 touring models with electronic throttle control (for these models we suggest using our Twin Tuner in combination with the Twin Scan II+ Tuning Aid).  

· 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

· Full support for J1850 data bus used for communications with turn signal/security module (TSM/TSSM) and instrument cluster on 2004-2009 models

· Support for new 6th gear indicator on 2007-2009 models

· Enhanced data logging and diagnostics

· Programmable user input and output

· Billet aluminum housing with black anodized finish

· Easy plug-in installation

· All outputs protected against short circuits

· Supports all sensors including theft/security module

Not legal for sale or use on pollution controlled vehicles

 

Find out how the why the TCFI III is superior to the ThunderMax. Read the TCFI III and ThunderMax Comparison.   Please visit our Tech FAQ and read the material about TCFI applications and tech support for more detailed information about our system.

The TCFI kit now includes the new WEGO IIID dual channel wide-band exhaust gas oxygen interface that allows auto-tuning 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 - the system then does the rest. No Dyno tuning required!

The TCFI solves tuning problems with highly modified engines. Competitive “band-aid” products that interface to the Delphi^® controller still rely on speed-density fuel control. 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.

High-end automotive racing systems use 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 TCFI brings this proven technology to the H-D^® marketplace.  

The TCFI has the same ignition control as our proven TC88/TC88A Twin Cam ignition systems with fully programmable advance curves. Idle air control including idle RPM and cold start characteristics are also fully programmable. This facilitates the use of throttle bodies modified for higher airflow.

New H-D^® motorcycles use the SAE J1850 data bus for communications between the engine control module (TCFI), instrument cluster, turn signal/security module (TSM/TSSM), and diagnostic scan tools. The second generation TCFI fully supports this new J1850 data bus including the use of the H-D^® scan tool to read sensor data and clear diagnostic codes. The TCFI also has built-in data logging that 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 USB interface plugs into the existing H-D^® diagnostic connector on the motorcycle wiring harness. 

 TCFI Installation

Download TCFI Installation & Tuning Manual 

The TCFI is intended for 95 CID and larger high performance race engines that are expected to produce over 100 HP. The TCFI has been tested on engines up to 145 CID and 170 HP. 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 (like the newer Dynojet units) or you can use our WEGO. With the WEGO, the system will auto-tune the fuel tables while you ride the bike - you won't need to spend any time on a dyno. Auto-tuning under actual riding conditions only takes a few hours and gives much more realistic results that dyno tuning. Air-cooled engines are very sensitive to thermal effects and dyno systems generally have inadequate cooling airflow.

WEGO IIID Interface and Bosch LSU 4.2 Sensors 

Wide-Band Oxygen Sensor on Front Pipe

Wide-Band Oxygen Sensor on Rear Pipe

If you are purchasing your first TCFI kit, we highly recommend that you also obtain our TCFI II View software. This allows you to use a Palm OS based handheld organizer (PDA) to view engine parameters including air/fuel ratio during tuning.   

 TCFI View Software Running on PDA

The TCFI system is race proven. Just ask Dan Hope of Nevada, MO who runs the TCFI on his 2005 Deluxe in the AHDRA ET class. 

PC Link Software for Programming Custom Advance and Fuel Tables

PC Link software runs under Microsoft Windows 98/ME/XP/Vista. PC Link allows the user to program all the engine control tables and parameters within the Twin  Tec TCFI system. Minimum PC requirement is a 300 MHz Pentium with super VGA display (SVGA with 1024 x 768 pixel resolution). The TCFI 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. If you have an older PC without USB capability, you will require special order PC link cable P/N TCFI-C. For more details, please refer to our PC Link Tech FAQ.

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. 

On 2004 and later models using the new J1850 data bus, the ECM (engine control module) converts signal pulses from the VSS (vehicle speed sensor) to data that is transmitted to the instrument cluster. Scaling (in terms of VSS frequency/speed) varies slightly between models depending on tire size and gear ratio. You can use PC Link software to change the default scaling and recalibrate the speedometer/odometer. For more detailed information, we suggest that you download the software and instructions. 

Sample 3D Ignition Advance Table

Sample 3D Air/Fuel Ratio Table

Sample 2D Idle Speed Table

Sample Engine Control Parameters Screen

The TCFI 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 TCFI III Installation & Tuning Manual) from our website. The software will run in demo mode without a TCFI system attached. For your convenience, we include a copy on CDROM when you purchase the TCFI system.

Download PC Link TCFI III Software 

TCFI Data Logging Software

The TCFI features comprehensive data logging capability. During dyno testing, you can display real time engine data on an instrument panel type screen. The new TCFI Gen III 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 TCFI data logging capability greatly facilitates fine tuning and diagnosis of driveability issues. The data logging software, TCFI III Log, has the same PC requirements as described above for  the PC Link software. For more detailed information, we suggest that you download the TCFI III Log software and instructions. The software download includes a sample file with actual data.  

Real Time Engine Data Display