The wastegate bypasses exhaust gas around the turbine using a valve in the turbine
inlet controlled by compressor outlet pressure. This serves to limit turbocharger
speed at high engine speeds and loads. In doing this, it reduces the boost pressure
attained at full speed full load.
Wastegate turbochargers are matched to give good performance at low engine speed
with the valve closed. This improves transient response and reduces exhaust temperatures
and emissions. As engine speed increases, the wastegate valve begins to open
at a pre-set boost pressure. This has the effect of increasing the swallowing
capacity of the turbine, reducing shaft power and avoiding excess air delivery
and rotor overspeed.
Holset wastegate turbochargers are engineered for superior durability and reliabilty.
They are the premier choice for heavy duty applications.
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