Active Exhaust System
| ITEM | DESCRIPTION |
|---|---|
| 1 | Bracket and isolator mounts |
| 2 | Vacuum pump |
| 3 | Solenoid valve |
| 4 | LH exhaust valve |
| 5 | Pipe |
| 6 | Pipe carrier |
| 7 | RH exhaust valve |
| 8 | Reservoir |
| 9 | Restrictor |
| 10 | Check valve |
The active exhaust system allows exhaust gases to bypass the muffler to produce a more sporty exhaust sound. In addition to the exhaust valves, the active exhaust system has:
- A vacuum pump
- A solenoid valve
- A reservoir
- Related pipes, which incorporate a restrictor and a check valve.
Each exhaust valve consists of a normally open plate valve and pneumatic actuator.
The vacuum pump, solenoid valve and reservoir are attached to a bracket installed in the left rear wheel housing, behind the wheel arch liner. Plastic pipes are connected between the vacuum pump, reservoir and solenoid valve, and between the solenoid valve and the two exhaust valves. The pipes to the RH exhaust valve are located in pipe carriers attached to the rear floor brace.
In the pipes between the solenoid valve and the exhaust valves, a restrictor is installed in parallel with a check valve. The restrictor slows the flow of air through the pipes, to damp the opening of the exhaust valves. The check valve ensures air flows only through the restrictor when the exhaust valves are opened, but allows the restrictor to be bypassed when the exhaust valves are closed, to give an un damped closing movement.
The solenoid valve controls the operation of the exhaust valves by connecting them to the reservoir and vacuum pump or to atmosphere.
Atmospheric pressure enters the solenoid valve through a filter attached to a vent.
Operation of the active exhaust system is controlled by the ECM (engine control module).