Owners manual

INST A LLATI O N INS T RUCTI O NS 3
MSD POWERSPORTS • WWW.MSDPOWERSPORTS.COM • [phone] • FAX [phone]
ADJUSTING TUNES
Each tune has a variety of settings that can be adjusted to customize how the engine handles. Not all tunes
will need to be changed for all riders and riding styles. The MSD Charge FI will prescribe parameters exactly
as they are entered by the user. The unit will not protect the engine from damage if setting parameters are
made outside of safe operating range.
SETTINGS
In this tab users can put in the basic parameters for the engine.
Engine Speed Limit - This is the overrev limit and is always active in order to help protect the engine
from damage. The engine will not be allowed to go faster than this setting at any
time.
Vehicle Speed Limit - This is the maximum speed (mile per hour) the vehicle will go. When the ECU
sees the given speed a rev limiter will be activated even if it is below the Engine
Speed Limit.
Decel Fuel Cutoff - This setting allows the user to automatically shut off the fuel during deceleration.
Doing so can help with fuel efficiency, depending on driving habits. The user
defines the lowest rpm at which the fuel should be cut off. There are a number
of other parameters, such as engine temperature that cannot be controlled by
the user. After all parameters are met, the fuel will be shut off when the throttle
position is fully closed and the engine is reving over the set speed.
ADVANCE
This tab allows users to set change the factory prescribed ignition timing for the engine. The table allows
changes to be made in single degree increments based on engine RPM per MAP PSIA. Using the table a
tuner can adjust the timing anywhere from 30° of retard up to 30° of advance. See “Table Features” below
to learn about using and editing data tables in MSD View.
FUEL
The Fuel table in MSD View can add or subtract a percentage of the factory fuel injection signal based on
engine RPM per Throttle Position. All values entered to the table act as a percentage change to the original
signal from the ECU. The values in this table can range from -50% to 80%. At the lowest value, fuel will be
cut in half. The highest enterable value will nearly double the amount of fuel injected in the engine. See
“Table Features” below to learn about using and editing data tables in MSD View.
FUEL ACCEL
The Fuel Accel plot offers users the ability to recreate the functions of a carburetor’s accelerator pump
(pump squirt) in a fuel injection system. This feature monitors the signal sent to the fuel injector for changes.
Each time the signal increases an extra percentage is added to the prescribed amount to assist the engine
in acceleration. The extra percentage, prescribed by the RPM based line in MSD View, lasts only during
the time where fuel requirements are rising.
To plot a line, click and hold a dot to drag it to a new location. New dots can be added by right clicking
within the plot, or by entering coordinates in the table. The table shows the exact position of each dot and
can be found in the lower left corner of the MSD View window. The Fuel Accel plot includes changes in 50
rpm increments and fuel additions of 1% at a time. A maximum of 4 points can be set.
The line designates a percentage of fuel to be added to the fuel system that is originally prescribed by the
stock ECU. The highest possible plot, 200%, will add two times the originally designated amount of fuel.
With the addition, three times the original amount of fuel will be injected during the specified conditions
under the 200% setting.
NOTES
The Notes tab allows users to keep basic information with a particular tune. The notes section works the
same way as a simple Notepad program. This area offers the ability to name tunes, explain reasoning for
changes, keep notes on the location or conditions when a tune was used or any other plain text items the
user would like to enter.