Haltech F9A - Manual (Page 36)

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4.3 Using the Software
In order to make the software easy to use, the programme presents you with a menus bar at
the top of the display. The menu bar is accessed through simple combinations of key
strokes. Once the appropriate menu has been accessed a sub-menu appears giving choices on
available page heading. To increase efficiency there is also a number of hot-keys that allow
you movement between pages without accessing the menu bar.
4.4 Accessing the fuel maps
Pressing
sP
will take you to the Maps Menu. From the Sub-menu choose the fuel maps
option. By using the cursor keys to move the highlight bar or pressing the underlined letter
of the option required in the case
)
. This will produce a further sub-menu that will allow
you to choose a range to be viewed.
4.4.1 Fuel Setup
The Fuel Setup works in an identical way to the Identification. It’s fields are different and
relate to the way the fuel is delivered to the engine. Enter the Fuel Setup by pressing
sV
and then by pressing
)
key. The fields in the Fuel Setup are:
Ign / By: Ignition Divide By is the number of ignition pulses that will be counted until the
next injection pulse. For almost all multipoint systems, injection should occur once
per revolution and so Ignition Divide By should be set to half the number of cylinders.
If the system is operating in Batch Fire or Sequential mode, or is a rotary, then a value
of 1 is suggested.
Decel Cut-Off: A common fuel saving feature in original equipment computers is a fuel cut-
off on deceleration. This will cut fuel delivery to the engine while coasting down hills
with closed throttle. This feature can be enabled or disabled on the F9. It is better,
when first tuning, to disable this function.
Injection Mode: The F9 splits its four injector driver outputs into two banks. INJ1 and INJ2
comprise the first bank. INJ3 and INJ4 form Bank 2 (refer to the wiring diagram at the
back of this manual.) In Basic Mode, Fuel can be injected in three different modes.
Multipoint injection fires all the injectors together. This is the most common setup
and will normally be used on engines with multipoint injection manifolds (one injector
per cylinder).
Batch-fire injection is usually used in throttle body or non-turbo rotary setups and
fires the two banks of injectors alternately. On eight and twelve injector fuel rails,
with high-flow injectors, this may also help reduce fuel pressure oscillations caused by
all injectors pulsing together.
Staged injection is usually used on high boost turbo engines. Injector Bank 1 fires all
the time, just as in a multipoint setup. Beyond a set boost pressure, the second bank of
injectors is enabled. These "staged" injectors are normally upstream of the primary