Haltech F9A - Manual (Page 32)

31
CHAPTER 3
Engine Identification
3.1 Checking the Identification
The Identification page tells the F9 essential information about the engine characteristics.
Without this information being correct the engine cannot run properly. The Identification is
made up of several fields. Each field can have a number of settings, and you can change most
of the fields.
Use the Up and Down arrow keys (
o
and
p
) to move between fields. The fields are either
Selection type, or Text type. The Selection type fields give you a number of valid entries for
that field. For example, the valid number of cylinders can be set to 1, 2, 3, 4, 5, 6, 8, 10 or 12.
The Tab and Enter keys (
v
and
y
) keys are used to change this type of field. Each stroke
of the Tab key will display the next selection. The Shift and Tab keys together will step
backwards through the selections. Once the desired selection is displayed, the Enter key is
pressed to programme that selection. Text Fields require you to enter either text or numbers.
Once the field is selected, the new text can be typed in, with the Enter key to finish. An
example is the Rev Limit. This field can be set between 2000 and 16000 rpm. If you want the
rev limit to occur at 7000rpm, then you would need to select this field using
o
or
p
and then
type
y
.
Here is a description of each of the Identification fields:
Cylinders:
The number of engine cylinders needs to be entered here. This parameter is
used to determine the engine speed.
Load Sensing: The F9 can use either the manifold pressure or the throttle position as a means
of determining the engine load. Most engines operate using manifold pressure to sense
engine load. If your engine employs any form of supercharging, you must run in
manifold pressure mode. Only wild cams, motorbikes or heavily ported rotaries
require throttle mode - i.e.. engines whose vacuum signal is small, or fluctuates
greatly. If you are unsure what to use, contact your Haltech dealer.
RPM Limit: The F9 can limit the maximum rpm to which the engine will operate to. Above
this level the F9 completely cuts fuel to the engine. When the engine speed drops
below the RPM Limit the F9 will resume normal fuel delivery. This is known as hard
limiting. If the RPM Limit is not needed then set this value above the highest
operating point of the engine.
Units: The Haltech F9 programming software can display parameters in either Metric or US
units.