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 500 EFI modules in stock,
Fuel Moto stocks all of the tuning modules we offer and
ship them fast
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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) Why does my bike
lack throttle response and performance? Why does it run
so
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 configured primarily to meet emissions and sound requirements
and 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 significant gains in horsepower and torque
with simple bolt on items. Performance Increases by as
much as 15-20%
are very common, along with these 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) From the factory all EFI Harley models are
tuned based on several objectives. This includes emissions standards
and the calibration itself is based on the stock
components. The Delphi ECM is a speed density system
which is based on modeled airflow. While the system is
calibrated based on load and air mass the closed loop area
of the calibration is configured to operate at or near
14.68 AFR. In most calibrations closed loop is from idle
up to approx 80 kPa (say approx 60% throttle) which during this time the ECM uses
feedback from various sensors including the stock narrowband O2 sensors
to maintain the tune. 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 system 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 (or near)14.6:1 in closed loop. Although there is a window of
adjustment and the system does have the ability to adapt
to a certain extent, It is simply not in its strategy or is it
capable of adjusting for free flowing components
When you change these parts you can easily put the fuel
requirements 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 leaner than optimum. If
your fuel requirements are beyond the ECM's adjustment
the mixture goes dangerously lean, it can easily go
leaner than 15:1. This
is where you will feel poor throttle response, surging,
detonation and in extreme cases engine damage. The 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.
For more questions or for
information contact Jamie at 877-729-4754 or email me at
jamie@fuelmotousa.com
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