Fuel Moto specializes in
Harley Davidson V Twin tuning and performance. We offer
the latest tuning and exhaust products from leading
manufacturers with the best product support in the
industry
Click here
for the latest EFI tuning products. Fuel Moto is the
USA's leader in EFI performance and the #1 Dynojet
dealer in the country, we also have the worlds largest
database of Dynojet Power Commander maps.. We have
extensive experience with the products we sell and offer
full in-house product support on all of the EFI tuning
platforms we offer. With over 400 EFI modules in stock,
Fuel Moto stocks all of the tuning modules we offer
Click here
for Harley Davidson Exhaust systems. Fuel Moto offers a
wide range of quality exhaust systems from premium
manufacturers. We also support the exhausts we sell with
fuel maps that we develop in house on our dyno. Fuel
Moto stocks 250+ Harley exhaust systems at our location
Click here for Stage 1 and other performance air
cleaners for all Harley models
Click here for Performance Cams for Twin Cam models
Q) Does your bike
lack throttle response and performance? Does it run very
hot?
A) Fuel
Moto specializes in making these bikes run at their
best. We have dyno tuned thousands of Harleys and know
which combination of parts works on each model and why.
Stock bikes are set up very restrictive, primarily to
meet EPA emissions and sound requirments. They are
restricted by means of the air cleaner, exhaust, as well
as the EPA mandated EFI calibration, all of which are a
compromise for proper drivability and performance. By
changing these components with the proper combination
you will see horsepower and torque gains of 12-18% which
are very common. Along with the noticeable performance
gains you will see much better throttle response and
substantially cooler running.
Q) Why does my
Fuel Injected Harley Davidson need to be tuned?
A) All EFI Harley models are required to meet
very lean EPA emissions standards with the stock
components. The entire closed loop area has an AFR
target of 14.6:1 which is very lean. In most
calibrations closed loop is from idle up to approx 60%
throttle or 80 kPa which during this time the ECM uses
feedback from various sensors including the stock narrowband O2 sensors. The NB O2
sensors can only measure a small area near stoich which
is 14.6:1 (+/- about .3) Besides the EFI systems ability
to adjust for conditions such as ambient temperature,
barometric pressure, etc... the EFI is designed to
adjust for small variations such as inconsistencies in fuels and production
tolerances based on the stock components but the primary
function is to keep the AFR
at 14.6:1. Although there is a window of
adjustment It is simply not in its strategy or is it
capable of adjusting for free flowing components such as an air cleaner or exhaust system.
When you change these parts you can easily put the fuel
requirements well outside of the EFI's window of
adjustment as it is calibrated for the stock components.
This is a problem, especially considering the closed loop AFR target in the stock calibration is 14.6:1 which is
already very lean. So what happens? You guessed it, if
your fuel requirements are beyond the ECM's adjustment
the mixture goes dangerously lean, well above 15:1. This
is where you will feel poor throttle response, surging,
detonation and in extreme cases engine damage. Also note
that the NB O2 sensors
are of little help as they have major limitations from a
tuning standpoint. Since the sensors can only measure a
small are near 14.6:1 and only provide feedback when
they are switching and in closed loop, the sensors
simply cannot provide feedback to the ECM for a mixture
they cannot measure in the first place. This also
includes includes all of the open loop areas which are
all of the upper RPM's and throttle positions as well as
wide open throttle. These higher RPM regions are
generally not as much of a problem as the stock
AFR targets have to be richer to prevent detonation, but
they are certainly not optimum. For these reasons EFI
tuning is one of the best improvements you can make to
your bike. This is our specialty and we offer 100%
tuning support.
Click here for 2010 Harley Davidson tuning and
product information and updates
For more questions or for
information contact Jamie at 877-729-4754 or email me at
jamie@fuelmotousa.com
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