Haltech F10 User Manual download pdf (Page 38)

CHAPTER 4 ADJUSTING HALTECH MAPS

This Chapter describes the fuel maps that are the heart of the F10s ability to accurately

deliver fuel to the engine.

The following instructions assume that the user has the software running ONLINE on a PC,

with the ECU powered and connected via the supplied programming cable. It is also

assumed that the user is familiar with the ECU Set-up described p reviously .

4.1 What are maps?

The injection times data required to fuel the engine p rop erly at different engine load speed

temperature etc.. are stored in the F10 ECU of numbers called a look-up table. The F10

determines the en gine's load and sp eed, and uses these two p arameters as an index to the

table. This table is called the Fuel M ap. For instance, at an engine speed of 4000 rpm and at

-20kPa, the relevant number in the table may be 4.35. If the engine approximates -20kPa at

4000 rpm, then the computer will extract the value of 4.35ms from the table as the base

injection time. This value is then adjusted to compensate for numerous conditions, such as

temperature or acceleration, and then the ECU holds the injectors open for that time on the

next injection.

It is possible to p rogram the F10 by directly chan gin g the valu e of each number by

programming in the numerical mode (R efer 4.5.6 Numeric Mode, 37), but this can be

extremely difficult, so the Haltech allows y ou to change the numbers by manipulating

graphics in maps presented as bar graphs. (This is much simpler and allows you to visualise

the map)

Since it is diff icult to interp ret all the table's values at once, the p rogrammin g software

divides the map by engine sp eed into a series of rpm ran ges

. Within the r an ge, each load

point is represented by a vertical bar. When y ou view a ran ge from the Fuel M ap, you see a

bar chart of injection time versus load for all the load points in the table at that speed.

There are other tables in the F10, such as those used for temperature corrections. They are

indexed by only one parameter, and so are not divided into ranges. These tables are also

called maps.

4.2 What is mapping the Engine?

Mapping the engine is filling the look-up tables with the correct values for your engine. This

is done by adjusting the heights of the bars within the maps. Bars may be adjusted one at a

time, or in group s. The Haltech programming software has been designed to make engine

mapping as simple and intuitive as p ossible.

4.3 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 keystrokes.

Once the app rop riate menu has been accessed a sub-menu ap p ears giving choices on

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Haltech F10 User Manual Page 38