Haltech E6X Manual DOS Version - Manual (Page 74)

E6X Manual
74
9.4 The Ignition Inlet Air Temperature Map
This Map allows up to 10° advance or retard of the spark timing based on the inlet air
temperature. Normally this Map would not need to be used, but in some cases such as high
inlet air temperatures on turbo/supercharged engine, retarding the spark may help preserve the
engine.
9.5 Barometric Correction
NOTE:
The description that follows is targeted at advanced applications. Only limited
installations use barometric compensation.
If you are using a MAP sensor as your load reference we suggest that you set
the barometric lock in the fuel set-up to “disabled” and bypass this section.
If using throttle position for load sensing barometric compensation is required.
Please note that the default map for barometric compensation is flat and a
barometric compensation map must be compiled. See the sample map below.
Fluctuations in barometric pressure vary the density of the intake air of the engine. At lower
barometric pressure, the engine cannot breath in as much air, and therefore the amount of fuel
delivered to the engine must be reduced. This is necessary when a large change in altitude is
expected during a driving period (a Hill Climb event such as Pikes Peak in the USA is a good
example).
The barometric correction map is used by the ECU to determine the fuel adjustments required
for the given barometric pressure. The map shown below is typical of a barometric map used
in conjunction with throttle position load sensing.