ThunderMax ECM with Auto-Tune for Harley-Davidson
ThunderMax builds complete ECM replacement systems with integrated auto-tune technology for Harley-Davidson fuel injected motorcycles. The ThunderMax Harley-Davidson auto tune ECM replaces the factory ECM entirely rather than acting as a piggyback tuner. Riders who want a self-tuning closed-loop EFI solution trust ThunderMax for complete plug-and-play ECM management.
TMF Cycles stocks one confirmed ThunderMax product. The Thundermax ECMs with Auto-Tune is priced between $857.99 and $1,088.55 depending on fitment. The Auto-Tune system uses closed-loop O2 sensor feedback to continuously adjust fuel and timing maps in real time. No laptop or external tuner is required after installation.
ThunderMax ECMs support Milwaukee-Eight M8 and Twin Cam platforms. Touring models including Road Glide and Street Glide benefit from precise fuel management and self-tuning capability. M8 Softail and Dyna builds gain improved throttle response with a complete ECM replacement. Riders can explore tuners and EFI and ECU modules at TMF Cycles.
ThunderMax stands out by combining a full ECM replacement with integrated auto-tune in one unit. Closed-loop O2 tuning eliminates separate tuning sessions after installation. The system adapts automatically to engine changes, altitude, and temperature without rider input.
Browse the full ThunderMax collection at TMF Cycles for ECM and auto-tune upgrades. Riders can also explore the air and fuel section and ECU modules at TMF Cycles. Contact the TMF team for fitment and model year questions.