Do I need 2 wastegates?

Do I need 2 wastegates?

With a 400-plus-cubic-inch engine, small exhaust wheel, and small exhaust housing, you just have to have two wastegates to control the turbo,” Kolivas says. If you wanted to leave on 8 pounds of boost at 4,200 rpm, that single wastegate would not bleed off enough pressure to hold it at 8 psi.

Are external wastegates better?

In virtually every performance related way, external wastegates are preferable to internal units. Of course, there are some tradeoffs for the increased performance. Namely, a significantly louder car. If you’re like us, that settles nicely into the “benefits” column.

How do external wastegates work?

Boost pressure controls a pressure actuator and determines if the wastegate is open or shut. Therefore, it will bypass some of the exhaust gases, while boost pressure is maintained at the set level. Very simply, wastegates prevent the boost pressure from climbing.

How does wastegate control boost?

By controlling and limiting the speed of the turbine, the wastegate regulates the boost pressure provided by the turbocharger. By preventing the boost pressure from rising indefinitely, the wastegate protects the turbocharger and the engine from damage.

What causes turbo boost spike?

A boost spike is the result of the boost controller holding the signal to the wastegate actuator / external wastegate for too long. To eliminate a boost spike, the wastegate must begin to open before target boost by a certain amount of time depending on the turbo system.

How should Wastegates be mounted?

The ideal position for maximum flow to the wastegate is to have its inlet tube mounted at as shallow an angle (more than 90 degrees) as possible from the primary exhaust tubes that feed the turbine.

How does a dual port wastegate work?

A dual port wastegate adds a second port on the opposite side of the actuator. Air pressure allowed to enter this second port aids the spring to push harder in the direction of closing the wastegate. This is exactly the opposite of the first port.

What is a turbo screamer pipe?

A screamer pipe is a type of exhaust configuration fitted to some automotive turbocharged petrol engines with an external wastegate set-up, which vents the waste exhaust to the atmosphere through a separate un-muffled pipe, rather than back into the main exhaust track. This exhaust setup is known for its loud noise.


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