Haltech F10X - Manual (Page 43)

F10X Manual
43
CHAPTER 5 HALTECH MAPS
5.1 What are Maps?
The Fuel 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. 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: