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ThunderMax ECM with AutoTune Closed Loop System
ThunderMax ECM with AutoTune Closed Loop System
Made in U.S.A.
35 Reviews

ThunderMax ECM with AutoTune Closed Loop System


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J&P Part #:  711-953
Mfr Part #:  309-460

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ThunderMax ECM with AutoTune Closed Loop System
ThunderMax ECM with AutoTune Closed Loop System

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ThunderMax ECM with AutoTune Closed Loop System

ThunderMax ECM with AutoTune Closed Loop System

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Product Details


Description for ThunderMax ECM with AutoTune Closed Loop System

If you're looking for the easiest way to manage your fuel system for the best motorcycle performance, it's here. The ThunderMax ECM With AutoTune Closed Loop System is the high-tech way to manage every aspect of your fuel curve for the best throttle response available in an aftermarket fuel system manager. It mounts conveniently in place of your factory ECM and plugs into your existing harness, and uses a closed-loop control system to continuously self-adjust and properly tune the motorcycle's air/fuel ratio for all riding conditions. The ThunderMax has hundreds of maps available to download for your bike. Choose based on model, engine size, exhaust system air cleaner, pistons, cams, and more. Then, load the map of your choice and the integral auto-tune will do the rest. You can adjust the idle speed, rev limit and speedometer calibration, front and rear cylinder AFR maps, ignition timing (spark) maps, and startup maps, all without dyno tuning. It works with all popular exhaust systems, is compatible with high-performance camshafts, and supports turbo, nitrous and supercharger applications. The software allows live monitoring, recording and examination of diagnostic codes and datalogs including number of starts, engine temperature and RPM operation. Easy installation and tech support, free software and updates included. 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. Will require the use of an exhaust system with 18mm sensor bungs or head pipes must be modified to accept 18mm sensors.

• Mount in place of factory

• ECM Self-adjusting

• Hundreds of maps

• Auto-tune

• Compatible with most exhaust systems

• Use with high-performance camshafts, turbo, nitro and superchargers

• Monitor, record and analyze diagnostic codes and stats

• Free firmware, tech support and updates

• System designed to work with 18mm O2 sensors

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ThunderMax ECM with AutoTune Closed Loop System

Product Specs for ThunderMax ECM with AutoTune Closed Loop System

Manufacturer Part Number:
Open or Closed Loop:
Sold in Units:
Warehouse Part Number:
With/Without 02 Sensor:

Fitment Questions?

With over 750 years of experience combined, our tech staff has the answers!

  • Harley-Davidson®

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    • Touring Road King CVO EFI FLHRSEI : 2002
    • Touring Road King CVO EFI FLHRSEI2 : 2003
    • Touring Road King CVO FLHRSE3 : 2007
    • Touring Road King EFI FLHRI : 2002–2006
    • Touring Road King FLHR : 2007
    • Touring Road King Police CA EFI FLHPEI : 2005–2006
    • Touring Road King Police CA FLHPE : 2007
    • Touring Road King Police EFI FLHPI : 2005–2006
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Product Notes

Important Product Notes

Not legal for sale or operation in the state of California.ÿCheck with the U.S. EPA and your respective state and local regulations to confirm emission compliance. This item cannot be returned once the package is opened. Manufacturing defects must be addressed through the manufacturer directly.

Shipping Note

Due to state regulations we cannot ship this item to the state of California.

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Ratings & Reviews

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35 Reviews
Rating Breakdown
5 stars
4 stars
3 stars
2 stars
1 star
September 3, 2020
I can't tell you how much JP cycles worked with me on getting the ThunderMax ECI unit installed they helped me and walk me through the programming of the unit their technical support staff goes above and beyond they even called me back to make sure everything was okay. There's only two guys in their tech support team and I worked with one gentleman his name alludes me but I have to say that they are phenomenal with their follow up and their knowledge base. if I was to ever buy a product aftermarket product I would go with JP cycles they know their s***.
June 1, 2020
Works like a ECM on my 2012 Road Glide should. I like the way you can hook my laptop to it and go in and program it and see the readings for fuel management and all the other things you want to look at. Works well with the S&S 2 into 1 exhaust with the 18 mm oxygen sensors. Wish I would have put this in my bike a long time ago.
May 16, 2020
I love my new thundermax auto tuner we're having problems dynoing my bike before but the thundermax auto-tune on downloaded their Maps started to bike at tood itself and runs so much better A lot better throttle response a lot more horsepower a lot better idle and motor runs a lot cooler
December 20, 2019
Quality and install is great still trying to find a tune that matches my set up
October 14, 2019
I was having misfiring issues and loss of power at low RPM with my bike for years. I took it to Harley and they said it was fine, then I took it to another shop who knew it wasn't right but couldn't find the problem. I read that there are issues with some stock ECM's. The ThunderMax was the best investment to replace my stock ECM and customize my tune. It runs like a new bike!
September 5, 2019
easy to install and load base map haven’t got bike in a day I yet but tuning software is easy to use but could be set up a little better
July 22, 2019
Easy to install and easy to get started with
June 17, 2019
The hardest part is finding the right tune. After that you HAVE TO CONNECT to the computer after riding it a few hundred miles and set the learned as the base. After you shut off the bike it goes back to the base tune and relearns the fuel air ratio. I’m getting great mileage with this new computer and have good power.
June 3, 2019
It fit like OEM on my bike. I have yet to use the tuning feature. A little pricey but worth it. Program was easy to download and use.
May 23, 2019
Spend the money. Nothing else compares.

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ThunderMax ECM with AutoTune Closed Loop System
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