Haltech E8 - Manual (Page 86)

Haltech E11/E8 Instruction Manual
Fuel Correction Maps
Air Temperature Correction
This map compensates for the change in density of the intake air charge when the intake air temperature
changes. Colder air is more dense which requires more fuel to be added in order to maintain a steady
combustible mixture.
The Fuel Air Correction Map is accessed via the Fuel Maps and Set-up Menu. Across the bottom of the
map displayed is the inlet air temperature. An arrow appears showing the closest bar that the system is
using. A horizontal line splits the map displayed. Bars above this line indicate a positive correction making
the mixture richer. Bars below the line indicate a negative correction making the mixture leaner.
Figure 89 - 2D Air Temperature Compensation Map
Coolant Temperature Correction
An engine requires more fuel when it is cold than when it is hot. This is a result of low manifold and in-
cylinder temperatures where fuel sticks to the walls and doesn't atomise properly. The Haltech system
corrects for this by using the Coolant Temp Map to define the relation between engine temperature and
extra fuel required. The ECU will automatically reduce the amount of coolant correction applied to the
engine as the throttle is opened and air speed increases. The Fuel Coolant Map should not be adjusted
until the Fuel Maps are correctly tuned at operating temperature.
Access the Fuel Coolant Map from the Maps Menu. The map defines the percentage increase in fuel at
any given engine temperature. The ECU is supplied with a default coolant map that may not need to be
modified. If the coolant map requires modification, the changes should be done ONLINE and while the
engine is warming. Start the cold engine and adjust the Fuel Coolant Map so that the engine idles evenly.
You should not touch the throttle while adjusting this map. Follow the arrow as the engine warms to
provide good running mixtures up to operating temperature, where there should be zero coolant
correction.
Page: 86 Copyright © Haltech 2008