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2) How it Works at High Speed
In a high speed zone, the amount of exhaust gas increases and it is accompanied with a great force.
Therefore, if the inner diameter of venturi is more widened, the turbine in the turbocharger by the
releasing force of abundant exhaust gas can deliver a more increased energy to the compressor. The
output will increase in submission to the increase of intake air volume.
Control
range
Turbocharger driving
mechanism
Control
method
Effect
Improved
performance
At high
speed
Expands the
flow passage for
the exhaust gas
by unfolding the
vanes
The flow rate is
increased due to the
expanded

Increased turbine &
impeller speed,
Increased
compressive force
Improved
maximum
power
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