THUNDERMAX with AutoTune. Fits Street Glide & Road Glide 2024up & CVO Road Glide ST 2024up 309-604

Engine Control Module with Integral Auto-Tune - Fits Street Glide & Road Glide 2024up & CVO Road Glide ST 

Does NOT for VVT models CVO Street Glide & CVO Road Glide

ThunderMax is an industry award winning, performance ECM designed specifically for EFI equipped Harley Davidson® motorcycles. This highly advanced, stand-alone tuning system utilizes proprietary AutoTune technology with wide-band oxygen sensors to deliver unmatched performance and rideability. ThunderMax comes 100% assembled, ready to install with no wire-cutting or splicing required. Simply replace the factory ECM and oxygen sensors, load a map, and enjoy your new ride!

Every degree and a half of throttle; every 256 RPM, there is a fueling point that is automatically adjusted. That means more control and a smoother running engine. With the built in barometric sensor you never have to think about ambient air changes. WideBand O2 sensors constantly read the Air Fuel Ratio and give live, real time feedback to the ECM. That means, no “accepting” the changes made to the map, once you key off the changes are written. The ThunderMax ECM is fully adjustable with our ThunderMax tuning software or can be used just by loading a basemap. The choice is yours.

NOTE:  Because of possible clearance issues, some aftermarket exhaust systems may require modifications or relocation of their oxygen sensor port bungs. the OEM exhaust system has 12mm o2 ports. The factory 12mm exhaust system is not compatible with the 18mm ThunderMax Wide Band oxygen sensors. Models with 12mm ports require the purchase an aftermarket exhaust system with 18mm ports.

• Mounts conveniently in place of the factory ECM and plugs in to the existing harness
• Utilizes wide-band oxygen sensors and works as a closed-loop control system to continuously self-adjust and properly tune the motorcycle's air/fuel ratio for all riding conditions
• Easy installation: replace the factory ECM, install new oxygen sensors and harness, load the correct map for your bike, and ride
• Includes ThunderMax ECM with Auto-Tune Module, plug-in harness and two wide-band sensors, TMax software and communication USB cable, Quick-Start Easy Install and Comprehensive User's Manual, technical support and free software and updates
• Hundreds of maps available to download for your bike (based on model, engine size, exhaust system air cleaner, pistons, cams, etc.) – load the map of your choice and the integral auto-tune will do the rest
• Improves throttle response, exhaust sound and driveability
• Rider can adjust idle speed, rev limit and speedometer calibration
• Adjustable front and rear cylinder AFR maps, ignition timing (spark) maps, and startup maps
• Works with all popular exhaust systems and is compatible with high-performance camshafts
• Supports turbo, nitrous and supercharger applications
• Software program allows live monitoring, recording and examination of diagnostic codes and data logs including number of starts, engine temperature and rpm operation
• New maps, software, firmware updates, map analysis and tech support available online (ThunderMax website) at no charge
• Made in the USA

Fitment Guide