ACTIA Diag4Tune AFR Tuning Monitor
Field of application: AFR Tuning Monitor, with two Wideband Sensors and a electronic Unit, for all Delphi EFI Models

The tuning system focuses on Harley-Davidson engines equipped with DELPHI EFI (diagnostic communication J1850 or CAN) - The tuning system is based on diagnostic system DIAG4BIKE. DIAG4BIKE is a professional diagnostic tool for Harley-Davidson Motorcycles, the basic tuning software DIAG4TUNE will be included as a free option in the diagnostic software. To tune an individual motorcycle a TUNING DONGLE must be purchased that can be used for that specific motorcycle.


The tuning process does not require the installation of additional component(s) or any motorcycle harness modification. Tuning is based on the modification of EFI Calibrations (software modification) exclusively via the diagnostic connector
The first step in Tuning is saving of the original EFI Calibration. The tuning operator can restore the original EFI Calibration at any time during the tuning process (stock calibration).
The tuning process is used to optimize Fuel Maps in case of any changes to the configuration of the engine components or accessories(exhaust or/and intake system etc.)