Twin scroll single turbo?

[kc3333]

The way I read the specs, it looks like the perf pkg won't be avail for the V6. Also, the Ecoboost looks to be a single turbo, not twin. Is that typical? I'm wondering what the performance gain will be in the I-4 over the V6 and if it will be worth the $$. The PP availability might be the push to get people to pay for the EB upgrade I suppose. Perhaps marginal gains in weight loss and agility? I missing what the extra $$ will buy you over the alum block & manifold V6…

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[DBCooper]

they're calling it a 'twin-scroll' turbo. So there may not be two turbo housings, but is essentially a twin turbo.

 

[Vickstang]

They mimic the effect of a pair of separate turbochargers, but don't have the increased complexity of cost of them.

 

[Vickstang]

Here's a good diagram of how they work:

1. CAPTURE

Instead of escaping through the exhaust pipe, hot gases produced during combustion flow to the turbocharger. The cylinders inside an internal combustion engine fire in sequence (not all at once), so exhaust exits the combustion chamber in irregular pulses. Conventional single-scroll turbochargers route those irregular pulses of exhaust into the turbine in a way that causes them to collide and interfere with one another, reducing the strength of the flow. In contrast, a twin-scroll turbocharger gathers exhaust from pairs of cylinders in alternating sequence.
2. SPIN

The exhaust strikes the turbine blades, spinning them at up to 150,000 rpm. The alternating pulses of exhaust help eliminate turbo lag.
3. VENT

Having served their purpose, exhaust gases flow through an outlet to the catalytic converter, where they are scrubbed of
carbon monoxide, nitrous oxides and other pollutants before exiting through the tailpipe.
4. COMPRESS

Meanwhile, the turbine powers an air compressor, which gathers cold, clean air from a vent and compresses it to 30 percent above atmospheric pressure, or nearly 19 pounds per square inch. Dense, oxygen-rich air flows to the combustion chamber. The additional oxygen makes it possible for the engine to burn gasoline more completely, generating more performance from a smaller engine. As a result, the TwinPower engine generates 30 percent more power than a non-turbocharged one of the same size.

 

[kc3333]

They mimic the effect of a pair of separate turbochargers, but don't have the increased complexity of cost of them.

Got it! That explains why they're calling out the two separate exhaust streams… probably more closely mimics two separate turbos. Perhaps each tube is more physically aligned with each exhaust valve, since the I-4 will be 4V...

 

[SLVRBACK]

Twin scroll is simply the design of the manifold. It doesnt not mean how many turbos there are.

A single scroll turbo uses a manifold that has X amount of primaries(in our case 4) that merge into a collector and then mate to the turbo flange.

A twin scroll turbo uses a manifold that separates the uneven gas flow of the manifold by mating(for example)primaries 1 and 3 or the header, and 2 and 4. Think of it like 2 separate manifolds in one.

They do this to make the exhaust pulses as even and efficient as possibly. Ultimately resulting in faster spool of the turbo. Althought this design doesnt show its true efficiency until you get into the higher size turbo range(i.e. 6262, GTX35r)

 

[kc3333]

Twin scroll is simply the design of the manifold. It doesnt not mean how many turbos there are.

A single scroll turbo uses a manifold that has X amount of primaries(in our case 4) that merge into a collector and then mate to the turbo flange.

A twin scroll turbo uses a manifold that separates the uneven gas flow of the manifold by mating(for example)primaries 1 and 3 or the header, and 2 and 4. Think of it like 2 separate manifolds in one.

They do this to make the exhaust pulses as even and efficient as possibly. Ultimately resulting in faster spool of the turbo. Althought this design doesnt show its true efficiency until you get into the higher size turbo range(i.e. 6262, GTX35r)

Great explanation. So, it is a single turbo / single propellor set up then?

 

[SLVRBACK]

Great explanation. So, it is a single turbo / single propellor set up then?

Correct.

 

[DBCooper]

Thanks for the correction.

 

[86GT]

Hey everyone, long time lurker, first time posting. Does anyone know what turbo they plan on using? I know the Focus ST uses a K03 and it'd definitely be too small for the 2.3

 

[dustyaman]

Probably a all new turbo most likely.

 

[the tank]

It's a single turbo with 2 turbines(hot side) and 1 compressor(cold side) they use a similar set up on the 6.7PSD.

 

[Colleton]

I found this. Good explanation and very interesting: http://www.modified.com/tech/modp-0906-twin-scroll-turbo-system-design/viewall.html

 

[Whiskey11]

Hey everyone, long time lurker, first time posting. Does anyone know what turbo they plan on using? I know the Focus ST uses a K03 and it'd definitely be too small for the 2.3

The Turbo is made by Honeywell which I think is all we know at this time. It supposedly has a different (larger?) turbo housing than the one on the MKC and of course I can't find that link to that article at this time (go figure right?).

EDIT: According to fordauthority.com it's a GT22.

http://fordauthority.com/2013/12/2-...ustang-uses-twin-scroll-turbo-from-honeywell/

They also say it's unchanged from the MKC which isn't what Ford said... I'll try and find that article.

 

[kc3333]

I found this. Good explanation and very interesting: http://www.modified.com/tech/modp-0906-twin-scroll-turbo-system-design/viewall.html

Wow, great find! It looks like the exhaust gases stay not-quite physically separate throughout the cycle, while feeding a single blade on the exhaust side. Very cool information.

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