3.0T turbo?

[ZED]

I was wondering if someone here knows when traveling down the highway at say 65-70 mph are the turbos at rest or are they spinning? This is my first turbo car and just wondering about how they operate.

[Dino]

If the car is running they are spinning, even at idle.

 

The exhaust gasses are what spins the impeller. the more gasses the faster it will spin.

When the turbo starts to put out more volume than the motor is taking in, then you start getting into boost.

In other words the intake system starts to pressurize and the intake charge is force feeding your cylinders.

Hence more air, more fuel, equals more power.

[drolds1]

How a turbocharger works.

[Under200]

My understanding is that the twin scroll turbos like mist modern ones come on between Low 2000 to 3000

[bbf2530]

Hi Under200. Not sure if you are stating that they are "off" below "low 2000 to 3000".  Technically, they are always "on" and spinning as long as the engine is running.  Even at idle, they are still being spun by the exhaust gases, just not providing boost/pressurization on the intake side.

A twin turbo setup works exactly the same as the single turbo setup shown in the video and posts drolds1 provided above. And, the video describes it much, much, much better than I ever can. ?  A twin turbo setup simply uses two smaller turbos, one for each bank of a V-6 (or V-8 etc.) engine, instead of one large, single turbo for the entire engine.

Essentially, a twin turbo setup is used to shrink the size and inertial weight of the turbos/turbines themselves.  It is easier to get two smaller, lighter turbos/turbines up to speed than it is to get one larger, heavier turbo/turbine up to speed.  The lower inertial weight is what allows modern twin turbo setups to give full boost at lower RPM's, as you noted. However, they are always "on", even when not providing boost.

Sorry if I misunderstood what you were stating, and I realize that is a very simplified explanation, but hopefully it will avoid any confusion for others. Good luck. ?

Edited September 15, 2018 by bbf2530
To remove a lot of my explanation. drolds1 video does it better. LOL

[drolds1]

Also, the term twin-scroll turbo should not be confused with twin-turbos.  The 2.0T engine uses one twin-scroll turbo while the 3.0 uses 2 turbos; one for each cylinder bank.

[MKZMark]

Here's a look at the twin-scroll setup on the 2.0.

[ajschicago]

@MKZMark From your last post, can I assume all post-2017 2.0  MKZ's are the twin-scroll 2.0's? I've seen some conflicting info about the use of this engine into the MKZ lineup. I know the twin-scroll version was originally launched in 2015 but with Ford, not Lincoln. 

Thanks for the cool pic, btw. 

[MKZMark]

I don't know, I'm sure others here know the history of this motor. Ford has some great motors in these eco-boosts, I never would have thought small displacement four and six cylinders would supplant big V8s but they do and do it well.

[drolds1]

On 2/2/2019 at 11:00 AM, ajschicago said:

@MKZMark From your last post, can I assume all post-2017 2.0  MKZ's are the twin-scroll 2.0's? I've seen some conflicting info about the use of this engine into the MKZ lineup. I know the twin-scroll version was originally launched in 2015 but with Ford, not Lincoln. 

Thanks for the cool pic, btw. 

The MKZ got the twin-scroll 2.0 in the 2016 MY.