ThunderMax ECM: Unmatched Performance Tuning for EFI Harley Davidson® Softail Motorcycles.

What is ThunderMax ECM?

ThunderMax ECM is an award-winning performance engine control module (ECM) specifically designed for EFI-equipped Harley Davidson® motorcycles. This advanced, stand-alone tuning system uses proprietary AutoTune technology along with wide-band oxygen sensors to deliver unmatched performance, rideability, and fuel efficiency. Designed to optimize engine performance, ThunderMax enhances your Harley Davidson®'s responsiveness, throttle control, and smoothness, offering a superior riding experience.

Key Features of ThunderMax ECM:

• AutoTune Technology for automatic fuel management adjustments
• Wide-band O2 sensors to maintain precise air-fuel ratios
• No wire cutting or splicing required—easy plug-and-play installation
• 100% assembled and ready for immediate installation
• Real-time feedback for constant engine optimization

Easy Installation for Quick Performance Gains

One of the most attractive aspects of ThunderMax ECM is its effortless installation. This performance upgrade comes pre-assembled, meaning you can easily replace your factory ECM and oxygen sensors without the need for complicated wiring or modifications. Once installed, simply load your map (or use the pre-programmed basemap), and you’re ready to enjoy an enhanced riding experience with immediate performance improvements.

ThunderMax ECM Installation Process:

1. Remove your stock ECM and oxygen sensors.
2. Install the ThunderMax ECM and wide-band O2 sensors.
3. Load your map or use the basemap for automatic tuning.
4. Start your ride and enjoy a smoother, more powerful engine.

Advanced AutoTune Technology for Optimal Fuel Management

ThunderMax ECM uses AutoTune technology to automatically adjust the air-fuel ratio at every 256 RPM and degree-and-a-half of throttle. This automatic fueling system provides more precise control over your engine’s performance, ensuring smoother throttle response and enhanced rideability under any riding condition.

In addition to AutoTune, the barometric sensor built into ThunderMax ensures your engine is always adjusted to optimal levels based on ambient air pressure changes. The wide-band O2 sensors provide real-time feedback to the ECM, fine-tuning your Harley Davidson® for maximum performance.

ThunderMax AutoTune Technology Benefits:

• Automatic fueling adjustments every 256 RPM for smooth throttle control
• Real-time feedback from wide-band O2 sensors for perfect air-fuel ratios
• Barometric sensor automatically adapts to weather and altitude changes
• No need to manually accept changes—settings are saved as soon as you key off

Fully Adjustable Performance Tuning

ThunderMax ECM offers complete tuning flexibility. While the system can be used with the pre-loaded basemap for quick, automatic tuning, it also supports advanced adjustments via ThunderMax tuning software. This allows you to fine-tune your bike’s performance settings based on your exact preferences, ensuring the ideal ride for every type of rider.

Customization with ThunderMax ECM:

• Advanced tuning options using ThunderMax software for full control
• Pre-loaded basemaps for easy, automatic setup
• Complete control over air-fuel ratio, throttle response, and overall engine performance

Why Choose ThunderMax ECM for Your Harley Davidson®?

ThunderMax ECM is the perfect solution for EFI-equipped Harley Davidson® motorcycles seeking improved performance, efficiency, and rideability. Whether you’re looking to increase throttle response, improve fuel efficiency, or achieve smoother engine operation, ThunderMax delivers outstanding results, effortlessly adapting to a variety of riding conditions.

Key Benefits of Upgrading to ThunderMax ECM:

• Enhanced throttle response for a more responsive ride
• Real-time automatic fueling adjustments for smoother performance
• Simple installation with no wire cutting or splicing required
• Customizable tuning options for a tailored riding experience
• Real-time optimization for improved engine efficiency

Upgrade your Harley Davidson® with the ThunderMax ECM and experience the next level of performance tuning. Whether you’re cruising down the highway or navigating through the city, ThunderMax ensures your engine is always operating at its peak, giving you a smoother, more powerful ride every time.

Installation Instructions

Emissions Notice

This product is intended for "RACE READY" vehicles only and is not for sale or use on vehicles otherwise subject to emission control requirements.  In the state of California, this product should not be used on any vehicle that is registered for use on public roads. Please view the ThunderMax 50 application guide for "STREET APPROVED" & ARB compliant products.

Part Number: 309-563