ARIA

ENGINE 152 8. Loosen and remove the hex flange bolts (2) to 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.