1. What is ThunderMax?
ThunderMax is an industry award winning, performance engine management system for EFI equipped Harley Davidson models. The ThunderMax ECM replaces the stock module and helps “unlock” various performance advantages not possible by “Flash” systems and other post-fuel “piggy-back” tuning devices. ThunderMax’s key performance advantage relies upon its proprietary AutoTune technology which utilizes 18mm Bosch wide-band oxygen sensor feedback to provide continuous AFR tuning corrections based upon riding conditions like temperature and altitude. The integral ThunderMax AutoTune system combined with the other system design advantages helps provide a motorcycle with increased throttle response & torque, improved overall rideability & performance, and a smoother & cooler running engine.
2. What is the difference between ThunderMax and other tuners?
ThunderMax differs from most other tuning systems and devices primarily because it is a complete performance Engine Control Module (ECM) which replaces the factory or stock module (therefore not limited by the stock ECM’s constraints). Most other systems are called “post-fuel devices” and are basically signal modifiers that adjust spark and/or fuel injector pulse widths. This method is somewhat crude and does not provide a reliable tune for changing ambient conditions like temperature, altitude, engine load, fuel, etc. Newer flash systems basically “wipe out” the memory of the stock ECM and become married to the motorcycle. This type of device still has the limitations of the factory ECM’s electrical hardware and is not capable of wide-band tuning without the use of an external tuning module.
3. What O2 sensors does ThunderMax include?
ThunderMax utilizes 18mm Bosch wide-band oxygen sensors and requires compatible oxygen sensors bungs located in your exhaust systems’ head pipes. Most popular aftermarket exhausts include 18mm oxygen sensor bungs and many factory head pipes as well – verify your exhaust system is compatible or see model fitment guide for exhaust details. If necessary, 18mm oxygen sensor exhaust bungs can be purchased through our distributors.
4. What are base maps?
Think of a basemap as the initial baseline tune for your bike’s configuration (engine displacement, injector size, cam, etc.). ThunderMax offers hundreds of different basemaps which have been pre-dyno tuned and can be selected / loaded through the TMax software. You may not always find an exact configuration match, but selecting a basemap with similar type of components will help you achieve a “faster tune-in” with the ThunderMax AutoTune System.
5. How does ThunderMax tech-support work?
If you need technical assistance with your ThunderMax, please feel free to contact our in-house Technical Support Department which is devoted to helping and supporting ThunderMax customers. In order to better assist our customers and to provide the quickest and most accurate means of technical support, our primary communication is via email and utilizes our AutoSupport process.
6. Will the ThunderMax work with factory functions?
Simply put, yes. ThunderMax is designed to operate with all OEM systems and functions.

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