AEM 30-6320 Series 2 Plug & Play EMS - Manual (Page 7)

Page 7 of 13
MIVEC System
MIVEC stands for “Mitsubishi Innovative Valve timing Electronic Control” and is used to
describe the company’s cam timing and lift control system. This is term is used as a catch-
all for two distinctly different cam control systems offered by the company. The first is a
variable intake valve lift and duration control system which can be found on the 4G69 2.4L
engine fitted to the regular Lancer. It operates similarly to Honda’s VTEC system where
the intake valve lift and duration change when the system is activated. The second is a
variable intake cam timing control system that is found on the 4G63 2.0L Turbo engine
fitted to the EVO IX. This system allows up to 31 degrees of intake cam timing adjustment
in relation to the crankshaft. (31 crankshaft degrees)
This system is active on this EMS when used with the provided startup calibrations and
can be adjusted through the use of the ‘VVC 1 Target’. Adjustments to the intake cam
timing are made by changing the values in the ‘VVC 1 Target’ map per Engine RPM and
Engine Load. The values in the ‘VVC 1 Target’ map can vary from 0.0 degrees for no
intake cam advance to 31 degrees for full intake cam advance.
Boost Control
The Mitsubishi Lancer Evolution boost solenoid can be used and is setup in the base map
for low boost. There is no wiring necessary. We have found through testing that the
amount of boost the engine will make with the stock turbo is limited because of the low air
flow capacity of the stock boost control solenoid. You may want to replace the stock boost
control solenoid with a higher flowing one which will allow you to run a higher boost level
and will also reduce the amount boost taper at higher engine speeds. The AEM Boost
Control Solenoid can be used as a replacement for the stock solenoid. This solenoid has
an outstanding pressure range rating and accepts 1/8” NPT for high boost applications.
Charging System
The EVO-IX has the ability to shut down the alternator via the EMS. This is performed via
the Injector#7 general purpose output (pin 8). Turning this ON will stop charging the
battery, reducing the parasitic drain on the engine. This is not activated in the AEM startup
calibrations.
Fuel Pump Control
The Low Side 11 output (pin 21) controls the main Fuel Pump Relay which turns the pump
on or off.
The Low Side 4 output (pin 55) controls the Fuel Pump Low Speed Relay (Relay 3 in
Mitsubishi wiring diagrams). This relay can be activated to decrease voltage sent to the
fuel pump. This output is always disabled in the start-up calibration.
The Low Side 12 output (pin 48) controls the Fuel Pressure Solenoid. The Fuel Pressure
Solenoid causes the Fuel Pressure Regulator’s vacuum line to reference atmospheric
pressure rather than the intake manifold pressure. This will increase fuel pressure in
vacuum, but the lack of pressure reference will lead to insufficient fuel pressure when
manifold pressure is above atmospheric pressure. This output is always disabled in the
start-up calibration.
WARNING: Reducing the voltage sent to the fuel pump can affect fuel pump output
(volume and/or pressure). If you wish to decrease fuel pump speed, monitor fuel pressure
and air/fuel ratio very carefully to avoid engine damage!