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Engine twin scroll turbochargers?

Discussion in 'Powertrain' started by 91DX, Dec 23, 2004.

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    91DX Guest

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    twin scroll turbochargers?

    i'm slowly learning about turbochargers and I came across something called twin scroll. The descriptions i found off google arent exactly clear. Could someone explain it?
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    sins New Member

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    that sounds like sequential turbochargers.... basically, big turbochargers give you great power at the lost of lag. Small turbochargers gives immediate boost but lack power. Link the two together.. small and big turbocharger run at the same time.. small one will out power the big one in the beginning... so you take off without lag.. but at higher speeds the big turbo takes over giving you that big turbo power.

    www.howstuffworks.org ..or net.. or com... i don't quite remember.
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    91DX Guest

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    uh....yeah. its one turbocharger, not two put together.
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    polo708 New Member

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    are you sure its not a supercharger? They make a <i>twin-screw</i> design... is that what you mean? I've never heard of a twin scroll turbo.
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    Fox New Member

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    Evo´s bring twin scroll turbo chargers... its basically what sins says but all in 1 turbo
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    James Bullshit Police

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    hmm so we have two different turbines inside one turbo housing?! is this what you're talking about?!

    whaaaaat
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    Fox New Member

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    From mitsubishis website: (Lancer Evolution Description)
    "The secret to getting 271 horsepower from a 2.0-liter 4-cylinder engine is air flow: The Lancer Evolution VIII's twin-scroll turbocharger delivers high boost from low engine speeds by minimizing exhaust obstruction. Dual exhaust passages from the engine to the turbine housing guide the exhaust gas smoothly to the turbine to improve low and mid-range torque and engine response."
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    exolyte Guest

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    i've never heard of a twin-scroll turbo charger. keep in mind, car advertisers are advertizing to the general public who most don't know a ton about cars. they guy who i went on a testdrive with my corolla said that if i supercharged it, its a 12 second car. i laughed at him.
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    XS PSI New Member

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    Yes u can say that. It's kinda like how proper headers are designed. Each pulse from each exhaust port is staggered so that they don't collide with eachother in the collector. Also by doing this the vacuum it leaves behind helps to pull the next exhaust pulse along.
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    Ninety Four New Member

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    XS PSI New Member

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    twin-scroll turbos are also called divided inlet turbos. All it really does is it keeps the exhaust ports seperated from eachother until it hits the turbine of the turbo. By doing this the exhaust gas pulses remain strong all the way to the turbo which help spin the turbine quicker (than single inlet turbos) at low rpms. The turbine itself is exactly the same as single inlets. Its really the turbo housing the manifold that is different.
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    Ninety Four New Member

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    So, instead of the exhaust pulses hitting the turbine together, they hit it separately, causing the turbine to spin faster and thus create more boost at lower RPMs....

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