Haltech E6X Manual DOS Version - Manual (Page 53)

E6X Manual
53
CHAPTER 5 HALTECH MAPS
5.1 What are maps?
The Fuel and Ignition requirements of an engine at a given point in time are based on the
operating conditions at that time. The operating conditions the ECU uses are: manifold
pressure, barometric pressure, air temperature, coolant temperature, throttle position and
engine position. The fuel requirements of an engine are dependant on the engine load and as
air temperature changes (assuming all other values remain the same) so does the quantity of
fuel required. These changes are stored in the ECU in a table of numbers called a map.
Most Maps are 2-dimensional like the “fuel air temperature” which maps fuel vs. air
temperature.
The ECU has two 3-dimensional maps: the base fuel map that maps fuel vs. engine load and
engine speed and the base ignition map that maps ignition vs. engine load and engine speed.
These 3-dimesional maps are made up of a series of 2-dimensional maps which make up a
range of maps. Below are two consecutive 2-dimensional maps that make up part of the 3-
dimensional fuel map: