ARIA

ENGINE

152

8. Loosen and remove the hex flange bolts

(2)

disconnect the EGR pipe

(1)

from EGR cooler.

9. Loosen and remove the hex flange bolts to dis-

connect the EGR cooler module

(1)

mounted on

the intake manifold.

FITMENT

For fitment follow reverse procedure of removal.

NOTE

Use new gasket every time and tighten bolts to spec-

ified torque.

2.1.8.3 TURBOCHARGER

2.1.8.3.1 DESCRIPTION

1. Compressor Inlet

2. Compressor Outlet

3. Electric connection

4. Turbine outlet

5. Turbine inlet

6. Actuator rod assembly

Compared to traditional turbochargers an electroni-

cally controlled Turbocharger has better performance

at low engine speeds. The turbocharger is controlled

by the EMS and the EMS ECU monitors the turbo-

charger to provide optimum boost.

FUNCTION

The actuator rod assembly in the turbine housing

controls the turbocharger vanes which help in getting

optimum boost. At low engine speeds when exhaust

flow is low, the turbocharger vanes are positioned

with minimum opening by the actuator. This increas-

es the velocity / pressure of the exhaust gases

pushing against the turbine blades, making the tur-

bine spin faster and generating more boost. As

engine speed increases, so does the exhaust flow,

the turbocharger vanes are opened to reduce turbine

pressure and maintain the target boost.

ADVANTAGES / FEATURES

•

Good low end torque.

•

Good transient response.

•

Good fuel economy.

•

Increased useful engine operating range.

•

It provides more matching level of pressure boost

even to a slow spinning turbine without providing

too much of a boost at higher speed.

•

Low engine noise.

•

Lower emission.