Bi-Turbocharger Operation
WARNING: This page is about a different variant/trim than selected.
A = DIRTY AIR; B = CLEAN AIR; C = CHARGE AIR; D = EXHAUST GASES.
| ITEM | DESCRIPTION |
|---|---|
| 1 | Engine |
| 2 | Exhaust system left intake pipe |
| 3 | Primary turbocharger |
| 4 | Left intake grills |
| 5 | Left air cleaner |
| 6 | Left charge air cooler |
| 7 | Charge air shut-off valve |
| 8 | Charge air recirculation solenoid |
| 9 | Right charge air cooler |
| 10 | Right air cleaner |
| 11 | Right intake grills |
| 12 | Electric throttle |
| 13 | Secondary turbocharger |
| 14 | Exhaust system right intake pipe |
| 15 | Turbine shut-off valve |
As the secondary turbocharger charge air pressure increases, the recirculation solenoid is closed and the charge air shut-off valve opened. This increases the charge air pressure from the secondary turbocharger and combines it with the charge air from the primary turbocharger.
The ECM maintains the turbochargers in bi-turbocharger mode until it determines that the engine operating parameters no longer require it. The ECM then switches the turbochargers back to mono turbocharger operation.