Resource Highlights
In this article you will obtain technical tips for the Turbo VGT.
![garrett_turbo_on_black](/images/default-source/theme/garrett_turbo_on_black.tmb-1920w.jpg?Culture=en-GB&sfvrsn=496c3c3_10)
Tech Tip Turbo VGT![]() | A small turbo responds quickly and is effective at low rpm. However, it cannot deliver the high flow at high rpm. On the other hand, a large turbo can deliver the high speed flow, but will be slower to respond. This leads to unacceptable response times ("turbo lag"). The VGT has a wider effective range. Varying the turbo vane position allows the turbo to be in small or large capacity configurations. These vanes are managed by an electronic unit. |
Strategy![]() | The limitation of the boost setting depends on two maps (engine speed- atmospheric pressure and engine speed - air temperature). A strategy allows detection and warning of any fault which may destroy the turbo. The DCU compares the air flow and the engine speed to check consistency. If a fault is detected, the DCU activates a recovery mode (reduced flow) to protect the system. The "overboost" function is activated according to engine speed variation and requested load criteria. |
Two stage VGT | The two stage turbo is managed by 3 pneumatic actuators (diaphragm). The following sensors are present:
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