Air Supply (ALPINA): Notes

The engine in the Alpina version  differs to the BMW AG engine in the following ways:

• 2 exhaust turbochargers
• 2 vacuum-actuated wastegate valves
• 2 catalytic converters and 4 oxygen sensors in the twin-pipe exhaust system
• 2 electrical blow-off valves

Item	Explanation
1	Electropneumatic pressure converter (for adjusting the bypass valve on the exhaust turbocharger for cylinders 4 to 6), activated by the DME
2	Electropneumatic pressure converter (for adjusting the bypass valve on the exhaust turbocharger for cylinders 1 to 3), activated by the DME
3	Engine ventilation heating
4	Intake-manifold pressure sensor
5	Intake air temperature sensor
6	Electromotive throttle actuator
7	Electrical blow-off valve
8	Intake silencer
9	Charging pressure sensor
10	Engine
11	Bypass valves (wastegate valves)
12	Charge air cooler
13	Exhaust turbocharger
14	Non-return valve with pressure limitation (for engine ventilation in the inlet ports)
15	Non-return valve to the fresh air pipe (for engine ventilation)