Haltech IG5 - Manual (Page 30)

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CHAPTER 4 USING HALTECH SOFTWARE
The tutorials presented in this chapter are examples of how to use the Haltech software.
They assume that you have the software running online on your PC, with the ECU powered
and connected via the supplied programming cable.
4.1 Using the Software
In order to make the software easy to use, the program 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 with the headings of the
available pages.
4.2 What is mapping the Engine?
Mapping the engine is filling in the look-up tables with the correct values for your engine.
This is done by adjusting the heights of bars in bar maps. Bars may be adjusted one at a
time, or in groups. The Haltech programming software has been designed to make engine
mapping as simple and intuitive as possible.
4.3 What are maps?
Ignition Maps
The ignition advance needed by the engine under different speed and load conditions are
stored in the IG5 in a look-up table called the Ignition Map. The IG5 uses the engine's load
and speed as an index to the table. For instance, at an engine speed of 4000 rpm and a
manifold pressure of -20kPa the relevant number in the table may be 35. When the engine is
running at 4000 rpm and -20kPa manifold pressure the computer will extract the value of 35
from the table and fire the ignition at 35 degrees. This value may be modified slightly by
other correctional maps also under user control which are described later. The programming
software divides the table into rpm range maps. Within each rpm range map there are 32
load points along the horizontal axis, each represented by a vertical bar. The greater the
vertical height of the bar, the greater the ignition advance. The load points usually represent
incremental changes in intake-manifold pressure but may, for certain engine types, be set up
by the user to represent changing throttle positions. When you view a Map (see section
4.3.1) you see a bar chart of ignition time versus load for all the load points in that particular
speed range.
Other maps
There are other tables in the IG5 which are also called maps. They are indexed by only one
parameter and so are not divided into ranges and are described later..