Additional Features for Harley Davidson
- The first new feature is "Rev X-tend". This will
give you the ability to have an increased rev limit over stock without having to
modify the bike's ECM. No longer will you need to take the bike to the dealer to
have the ECM "re flashed" in order to have the higher rev limit your bike needs
with modified cams, heads, etc.
- The second new feature is "Start Fuel". This allows
you to add additional fuel during startup. On heavily modified and/or large displacement
engines (i.e. 124 Cubic Inch) extra fuel is sometimes required to ease starting.
This is a software adjustable setting that makes it possible to increase the amount
of fuel injected into the engine during cranking without making the idle overly
rich once the engine starts.
How much additional power will it give my motorcycle?
There are many variables to each application. The Power Commander allows for tuning
to the perfect air/fuel ratio will ensure that the engine can produce the maximum
possible horsepower for that given combination.
Consider that a typical street rider spends a great deal of time riding in part
throttle conditions. Shown below are two graphs of a motorcycle before and after
installation of the Power Commander. The top graph line shows the horsepower curve
accelerating and the lower graph shows the corresponding air/fuel ratio. You can
see a large horsepower increase between the two. The red curve shows a typical stock
motorcycle with minor performance modifications (slip-on exhaust).
The blue curve shows that same combination with the Power Commander installed and
you can see that the line is nearly straight. Consequently, the rider will feel
a large improvement while riding the motorcycle. It is very possible that the peak
wide open throttle horsepower is unchanged. The correct air/fuel ratio number (say
12.9:1 or 13.2:1) depends upon many factors like combustion chamber design, but
what we want is that figure at every point in the curve (straight line).
Tuning with Power Commander
Base Map - The Power Commander is supplied with a given (base) map stored in the
microprocessor. This (base map) is typically a map that has been developed to provide
an improvement for most combinations matching the map description (i.e. stock bike
or performance exhaust and air filter).
In general we have found that a typical stock bike has areas in the fuel curve that
are far from optimal for drive-ability and performance. We could say that they are
typically 70% optimized in stock condition and 60% - 65% with minor performance
modifications. After installation of the Power Commander with the base map, we would
expect to see 85% - 95% optimization. Power Commander Alternate Maps - Each Power
Commander is supplied with a number of alternate maps on a CD-ROM and all the maps
are available for download on our web site.
You may notice that we have a map specifically for "Brand A" slip-on exhaust and
another for "Brand B" slip-on exhaust. Although the difference between the two maps
is likely to be very small, these difference will increase the optimization for
that given combination. If you have a "Brand C" exhaust and we do not have a specific
map, you should find that "Brand A" or Brand B" maps will provide a good improvement
on your bike. If you have a Windows 98SE/ME/2000/XP computer, you can upload alternate
maps or make changes to the existing map using the Control Center software and USB
cable supplied with your PC. (Detailed Software tutorials and quick reference software
screen shots are available on the CD-ROM or web site).
If you do not have a computer, you can change the fuel curve with the faceplate
buttons. This is a simple adjustment that can move the fuel curve richer or leaner
in each area of the map. (Please refer to the paper installation guide or adjustment
video on the CD-ROM).
Select MAKE, MODEL, YEAR from bike selector above