Using Autotune - Dynojet POWER VISION 3 Installation Manual

USING AUTOTUNE

Autotune is a process that tunes the VE Tables in an ECU using AFR (air/fuel ratio) readings from O2 sensors. The VE Tables
control how much fuel is injected into the engine. The more accurate the VE Tables in the ECU are, the better the engine will
run. Autotune uses a process that compares the known target AFR values in the Target AFR Tables of the ECU to the actual AFR
values read from the O2 sensors in the exhaust pipe and tunes the VE Tables in the ECU to more accurately refl ect the real VE of
the engine.
Autotune Basic utilizes the stock narrowband O2 sensors to read the AFR data from the engine's exhaust. Additionally,
because Autotune Basic uses narrowband O2 sensors to read AFR data, the Target AFR Tables of the ECU are set to
a single constant value very close to stoich AFR (14.7) when Autotune is enabled so that the narrowband O2 sensors
are able to read AFR across the whole range of the VE Tables. The Target AFR Tables are then restored to the original
values when Autotune Basic is disabled. It is especially important to remember to disable Autotune when fi nished
using Autotune Basic for this reason.
Autotune Basic can be used on most bikes that have factory narrowband O2 sensors installed.
Autotune Pro uses accessory wideband O2 sensors to read the AFR data from the engine's exhaust. Autotune Pro
however requires the installation of an appropriate Dynojet wideband O2 kit (P/N AT-130, AT-131, or AT-132).
Enabling Autotune
1
Connect the Power Vision to the vehicle. Verify the vehicle is on
and the engine is off.
2
From the Main Menu, select Tuning>Autotune>Enable>Enable
AT Basic or Enable AT Pro.
3
Autotune will prompt you to select a base fi le. Press Select
to use the last fl ash fi le as the base fi le, or Back to choose a
different fi le. All Autotune corrections will be built on top of this
base fi le. You may select the original stock fi le read from the
ECU or another tune fi le.
• Autotune will turn on the special Autotune enable settings
inside the tune fi le and save it as an Autotune Enable fi le to the PV3 fi le system. Autotune will automatically fl ash the
Autotune Enable fi le to the ECU. For more information, refer to Understanding Autotune Files on page 11.
4
Once the fl ash is complete, cycle the vehicle power. "AT" will appear in the upper left corner of the gauge screen
indicating Autotune is enabled. Autotune will remain enabled on the ECU until disabled.
Logging Sample Data
1
Start the vehicle. Autotune will automatically log sample data
when the engine is running. An Autotune logging status code
will appear in the top left corner of the gauge screen.
For example, the Autotune ready code (ATB OK or ATP OK) will
appear in the top left once all conditions are met and Autotune
can use the current sample data to calculate and apply
corrections later. For more information, refer to the Autotune
Logging Status Codes on page 12.
2
Spend time driving under all conditions that you would like
Autotune to correct. Spend time in as many combinations of
RPM and throttle position as possible. The more varied the
driving conditions, the more areas of the map Autotune will be
able to correct.
3
When fi nished with the Autotune logging session, press the Circle button to stop logging and to save the log before
turning the vehicle off.
Autotune saves the log fi les during logging sessions to an internal location not accessible with a computer. For more
information, refer to Exporting Autotune Log Files on page 10.
MAIN MENU
TUNING
TUNING FLASH TUNE
VEHICLE TOOLS
AUTOTUNE
DEVICE TOOLS
AUTOTUNE
AT STATUS:NOT ENALBED
ENABLE AT BASIC
ENABLE AT PRO
AT ATB OK
Engine Speed
3450
Gear
3
AUTOTUNE
AT STATUS:NOT ENALBED
ENABLE
DISABLE
APPLY VALUES
AT
12.6V
Engine Speed
Speed
0 52
Gear TP
3 42.1
01:32 12.6V
Speed
52
TP
42.1
9