ECM for 2018-2020 Softail Models

ThunderMax ECM: Performance Tuning for M8 Softail EFI Harley Davidson® Motorcycles

What is ThunderMax ECM?

ThunderMax is an award-winning performance ECM (Engine Control Module) designed specifically for EFI-equipped Harley Davidson® motorcycles. This highly advanced, stand-alone tuning system utilizes AutoTune technology and wide-band oxygen sensors to deliver unmatched performance, rideability, and efficiency. ThunderMax is engineered to provide superior throttle response, smoother engine operation, and optimized fuel management for an enhanced riding experience.

Key Features of ThunderMax ECM:

• AutoTune technology for automatic fuel adjustments
• Wide-band oxygen sensors for precise air-fuel ratio control
• No wire cutting or splicing required—easy, plug-and-play installation
• 100% assembled and ready to install
• Real-time feedback for continuous engine optimization

Effortless Installation for Immediate Performance Gains

ThunderMax ECM comes completely assembled, eliminating the need for wire cutting, splicing, or complicated modifications. With this easy-to-install system, you can replace your factory ECM and oxygen sensors, load a pre-programmed map, and instantly enjoy smoother throttle response and improved engine performance.

ThunderMax ECM Installation Steps:

1. Replace your factory ECM and oxygen sensors with ThunderMax components.
2. Load a map (or use the provided basemap) for automatic tuning.
3. Enjoy a smoother, more responsive ride with enhanced performance right out of the box.

AutoTune Technology for Seamless Engine Tuning

The ThunderMax ECM stands out for its AutoTune technology, which automatically adjusts fueling at every 256 RPMand at every degree and a half of throttle. This real-time fueling adjustment allows for a smoother engine and better control while riding.

Additionally, the barometric sensor ensures that changes in ambient air pressure are automatically compensated for, meaning you don’t need to adjust the system manually based on changing weather or altitude conditions. The wide-band O2 sensors provide constant feedback to the ECM, allowing for continuous optimization of the air-fuel ratio, ensuring your engine runs at peak efficiency.

Benefits of ThunderMax AutoTune:

• Automatic fueling adjustments for smoother performance at all throttle levels
• Real-time air-fuel ratio feedback for optimal engine performance
• Barometric sensor automatically compensates for atmospheric changes
• No manual adjustments needed—once the bike powers off, changes are automatically saved

Full Adjustability with ThunderMax Tuning Software

ThunderMax ECM is designed to be fully adjustable, offering flexibility to riders who want to fine-tune their bike’s performance. You can use the ThunderMax tuning software to make detailed adjustments to the engine control settings, or you can simply load a basemap and let the system do the work.

This flexibility allows you to customize your ride, whether you're looking for specific power gains or aiming to achieve better fuel economy.

Customization Options:

• ThunderMax tuning software for detailed, manual adjustments
• Pre-loaded basemaps for quick and easy tuning with automatic adjustments
• Full control over fueling, throttle response, and engine performance

Why Choose ThunderMax ECM for Your Harley Davidson®?

ThunderMax ECM provides the ultimate performance tuning solution for EFI-equipped Harley Davidson® motorcycles. Whether you want improved throttle response, smoother engine operation, or better fuel efficiency, ThunderMax ensures that your bike performs at its best under all conditions.

Why Upgrade to ThunderMax ECM?

• Enhanced throttle response for a more responsive ride
• Automatic fueling adjustments for optimal engine performance
• Easy installation with no wire-cutting or splicing
• Customizable tuning options for personalized engine control

Upgrade your Harley Davidson® with the ThunderMax ECM and experience improved rideability, smoother performance, and peak engine efficiency. Whether you're cruising on the open road or navigating city streets, ThunderMax ensures your motorcycle delivers top-tier performance every time you twist the throttle.

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: 309-589