Mitsubishi Lancer Evolution 8 MR. Manual - part 3

ENGINE (4G6) – BASE ENGINE (6 M/T)

1-5

6. Camshaft

Output at high engine speeds has been improved by altering the cam profile of the intake camshaft, and optimizing the valve
timing.

Evolution VIII MR

Evolution VIII

Cam height mm

35.96

35.79

Evolution VIII MR

Evolution VIII

T.D.C (top dead centre)

Intake valve open

Intake valve
closed

Exhaust
valve closed

Exhaust
valve open

Intake valve open

Intake valve
closed

Exhaust
valve closed

Exhaust
valve open

B.D.C (Bottom dead centre)

ENGINE (4G6) – INTAKE / EXHAUST SYSTEM (6 M/T)

1-6

Intake / Exhaust System (6 M/T)

1. Exhaust system

1-1 Turbocharger

A large-nozzle 10.5T turbo has been adopted in order to improve mid to high-range torque. Optimum control of the
supercharging pressure has ensured good torque and response at medium engine speeds.
The positions of the turbine housing and the wastegate holes have also been changed to achieve smoother outflow and
increase low-speed torque. Along with these modifications, the wastegate valve has been changed from an oval to a circular
valve.

(Evolution VIII MR)

(Evolution VIII)

Turbine housing

Wastegate holes

Oval valve

Circular valve

ENGINE (4G6) – INTAKE / EXHAUST SYSTEM (6 M/T)

1-7

1-2 Exhaust silencer

A tailpipe with built-in sound-absorbing material has been adopted, in order to increase the silencing effect.
Structural diagram

Main exhaust
silencer

Tailpipe
(with built-in sound-
absorbing material)

Cross-section A–A

Sound-
absorbing
material

ENGINE (4G6) – GENERAL, BASE ENGINE (6 M/T)

1-8

Control system (6M/T)

The following changes have been made, based on the control system in the 4G63-DOHC-T/C engine fitted in the current
Lancer Evolution VIII.

* Addition of wastegate solenoid valve (1 valve –> 2 valves)

System Block Diagram

Air flow sensor (AFS)

Air temperature sensor

Atmospheric pressure sensor

Water temperature sensor

Throttle position sensor (TPS)

A/C switch

A/C load signal

Cam position sensor

Crank angle sensor

Alternator FR terminal

Vehicle speed sensor

Power steering fluid pressure
switch

Knock sensor

Intercooler water spray (auto)

Intercooler water spray (manual)

sensor

Ignition switch –IG

Ignition switch –ST

Power supply

Engine ECU

Fuel injection control

Idle speed control (ISC)

Ignition timing control

Engine control relay control

Fuel pump relay control

A/C relay control

Fan motor control (radiator)

Fan relay control (A/C
condenser)

Alternator control

Air flow sensor filter reset
control

Fuel pressure control

Supercharging pressure
control

Secondary air control

Intercooler water spay control

Engine warning light control

sensor heater control

Purge control

Diagnosis output

RAM data transmission

No. 1 indicator

No. 2 indicator

No. 3 indicator

No. 4 indicator

ISC servo (stepper motor)

Ignition coil A (No.1 – No.4)

Ignition coil B (No.2 – No.3)

Engine control relay

Fuel pump relay 2

Fuel pump relay 3

A/C relay

Fan controller (radiator fan)

Fan motor relay (HI, LOW)
(A/C condenser)

Alternator G terminal

Air flow sensor

Fuel pressure control valve

No. 1 wastegate solenoid valve

No. 2 wastegate solenoid valve

Secondary air control solenoid
valve

Intercooler water spray relay

Intercooler water spray lamp

Tachometer

Engine warning lights

sensor heater

Purge control solenoid valve

Diagnosis output terminal

Diagnosis output terminal (for
MUT-II)

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