ThunderMax AutoTune Module Now Available!
The ThunderMax AutoTune Module works with your ThunderMax Electronic Fuel
Injection (EFI) controller to create a Wide-Band Closed Loop EFI System. Add
pipes, change cams – AutoTune’s on the job! The ThunderMax AutoTune processes
feedback from two wide-band oxygen sensors to adjust the fuel volume at all
RPM’s and throttle positions. These sensors continually provide feedback for
corrections to the fuel map values for optimum performance, Custom-Tailoring
the Fuel Map for your application!
The AutoTune kit consists of two wide-band (5 wire) oxygen sensors and a small
module that interprets and converts data from the sensors, which is then fed
electronically through the J1850 serial bus wiring through the data port plug
found on all Twin Cam® motorcycles. This means that if you have sensor bungs in
your exhaust pipes, the physical installation consists of simply screwing in
the oxygen sensors, plugging them into the AutoTune module, then plugging the
AutoTune module into the data-port plug and you're done - no wire cutting or
splicing! Next, use SmartLink software to automatically convert your open-loop
map to closed-loop format and download the map to your ThunderMax EFI module.
Simple? You bet! Many of the exhaust pipe manufacturers are getting on the
bandwagon and will be supplying pipes with bungs in them, and not just for 2007
motorcyles. D&D comes to mind as the first to do this.
So what exactly does the ThunderMax EFI AutoTune system
It adjusts fuel for a target Air/Fuel Ratio (AFR). The module (software,
really) has user-selectable targets for the AFR on 32 RPM pages (every 256
RPM), at 64 points on each page (that's over 2000 points if you're counting).
While this sounds like a lot, they are easy to adjust with point-to-point fill
commands, meaning you can move blocks of target AFR points with just a few
clicks. You can really concentrate on a certain area such as cruise RPM for
fuel economy or richen up full throttle maps for best power. If individual
point or map adjusting doesn't interest you, you can choose to override the
individual map pages with a straight, across-the-board AFR at all points by
entering the desired AFR in the AFR Override dialog and a single AFR you will
get. The AFR default is currently set to 13:1 on all of the AFR/TPS@RPM pages;
it provides a good balance of power and economy. You can adjust with AutoTune
How much will it adjust?
Quite a lot, actually. Up to 50% from the installed base map. How important is
the base map? It's still advisable to install the closest base map in our
system for your application to minimize the system's learning time. There are
two learning controls within the software that you can set. The first is how
much learning the system can do per session (a session being defined as
ignition-on to ignition-off, per cycle). The range per session is 0-50%; for a
close or dead-ringer match map, we recommend using the default setting of 5%
(use more if you have a combination that is a mismatch, for faster learning).
The second is the total amount of learning, regardless of the number of
sessions; the range is also 0-50%, default here is 20%.
So I let it learn, and it makes its own map, right?
Yes and no. The base map is the base map; it does not change within the module.
The firmware makes adjustments to the fuel volume dictated from the base map
using what are called "fuel offsets". These offsets are what the ThunderMax
learns with real-time input from the AutoTune. The offsets are stored in the
module, not in the base map. This means you can't upload the map from the
module, load it into another module and have those offset corrections follow
it. You can, however, adjust the fuel points manually while tuning if you run
the module in open loop (you still have that choice), but you don't have to do
that with the AutoTune enabled.
What else is adjusted?
The Idle Air Control and its Stops settings are automatically adjusted, always
learning. The IAC-Auto function we recommend running during initial startup
speeds up this learning process when performed initially. These are also
adjusted using offset points.
The ThunderMax AutoTune Kit Includes:
SmartLink Installation CD
2 Wide-Band oxygen sensors
No splicing necessary; plugs into the factory wiring harness for easy
New SmartLink software and firmware will automatically convert all existing
open loop maps to a closed loop format.
Software, firmware and base map updates are available on-line, 24/7!