Twin Tec TCFI Gen II Fuel Injection System Tuning Manual

The TCFI Gen II is a fuel injection system designed for highly modified Harley-Davidson motorcycles with fuel injected Twin Cam 88 engines. It is specifically designed for engines with long duration/high overlap camshafts. The TCFI can be used to tune the engine parameters such as AFR (air/fuel ratio), RPM, and TPS (throttle position sensor). This manual provides detailed instructions on installation, setup, and tuning the TCFI Gen II system.

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Twin Tec TCFI Gen II Tuning Manual | Manualzz

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Key features

  • Wide-band exhaust gas oxygen (WEGO) sensor interface
  • PC Link TCFI software for tuning
  • TCFI Log software for data logging and analysis
  • TCFI II View software for viewing engine parameters on a PDA
  • Auto-tuning feature
  • Front cylinder trim procedure
  • Stage RPM limit function
  • User output for controlling external devices
  • Barometric pressure compensation
  • Custom bike compatibility

Frequently asked questions

The TCFI Gen II is specifically designed for highly modified Harley-Davidson motorcycles with fuel injected Twin Cam 88 engines, particularly those with long duration/high overlap camshafts. It is not intended for street operation with stock or mildly modified engines.

The TCFI Gen II system uses PC Link TCFI software for tuning, TCFI Log software for data logging and analysis, and TCFI II View software for viewing engine parameters on a PDA.

The TCFI Gen II has both open loop and closed loop modes. The system enters closed loop mode after the engine warm-up time (180 seconds) has elapsed and the engine has reached the warm engine temperature (96° C). In closed loop mode, the system uses the WEGO sensor to control the AFR.

The front cylinder trim procedure is required for all engines with siamesed runner throttle bodies or 2-into-1 exhaust systems. It helps to compensate for fuel imbalance between the front and rear cylinders.

When dyno tuning, it is recommended to only edit the ignition advance and AFR tables. The TCFI should be operated in closed loop mode, and the engine should be warmed up properly before running. Additionally, it is important to pay attention to engine cooling and to use the TCFI data logging capability to monitor engine performance.
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