3 the ignition coolant map, 4 the ignition inlet air temperature map, 5 barometric correction – Haltech E6K User Manual
Page 63
57
map should not be altered unless the system is connected to a fuel injector test bench that will
allow the injectors to be accurately flow tested over a range of battery voltages and the
corrections calculated accordingly.
8.3 The Ignition Coolant Map
The Ignition Coolant Map allows up to 10° advance or retard of the spark timing based on
engine coolant temperature. This Map should only be used if there is a need to adjust the
timing for low or high temperatures.
8.4 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.
8.5 Barometric Correction
Note: The description that follows is targeted at advanced applications and
unless you wish to compensate for exhaust back pressure or are using the
throttle position 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 a MAP
sensor for load sensing, barometric compensation is automatic as map sensors
are manifold absolute pressure sensors and the readings compensate for
barometric fluctuations. The only application using MAP sensors that would
require barometric compensation would be when the exhaust back pressure
must be taken into account. If using a MAP sensor we recommend that you set
“Barometric Lock” in the fuel set up page to “disabled” (i.e. barometric
compensation is enabled). However please note that if you are using throttle
position load sensing, instead of a MAP sensor, barometric compensation is
always required. Please note that the default map for barometric compensation
is flat and a barometric compensation map must be compiled. See the sample
map at the bottom of page 70. The barometric compensation map should be
compiled as shown on Page 70 before any tuning takes place to ensure proper
compensation.