Twin Scroll Turbocharger - Explained

How twin scroll turbochargers work.Twin scroll turbo chargers split the exhaust portion of the turbocharger into two channels, separating the incoming exhaust pulses. This maximizes the efficiency of the turbocharger, and allows for maximum exhaust scavenging. Other methods of twin scroll turbos utilize different size vanes, a smaller angled vane for boost at low RPM, and a larger vane for high RPM boost with higher exhaust flow.

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[montlejohnbojangles]

I have to say, for a dude with a whiteboard and some markers, you run one of the most wonderfully important and informative YouTube channels around. Love your work, man. Keep it up!

[chuckcity]

Dude these videos are awesome. Being able to understand the engineering behind the mechanics makes repair and modification so much better.

[teonesterov]

Un-effing-believable.
You explain very complicated things in a simple and undestandable format.
What a talent, man. What a talent.
I absolutely love all your videos, as I am a passionate driver and rider.
Yes my F31 2.0d has twin scroll turbo. Thank you for the explanation 🤝

[UberBrostep]

Dude keep this up you have taught me so much in like thirty minutes

[tipstruckers]

Still watching your old videos in 2019

[TheRecon]

I love the twin scroll in my 2015 WRX, peak torque at 2000rpm is a lot of fun.

[justforever]

confused me for a minute, because the only type of twin scroll I ever had explained to me was the second type you speak of, which is sort of a form of VG turbo, basically the exhaust counterpart to dual intake runners. I had never heard of the first form of twin scroll, thanks for the good, clear explanation and simple back to basics educational style. I can't stand all the people who try to make their videos "clever" or "exciting". If you aren't excited by the very fact that you are learning something new, then you don't deserve to know it anyway.

[kaneguo]

Every clear video, just two little questions: 1. Form the first graph on the top left corner, 1 and 3 goes to one channel, 2 and 4 goes to one channel. But why in the last part you draw 1 and 4 in one graph, 2 and 3 in another?
2. Still for the last part, why there are no pressure underneath for 1 and 4 exhaust? It shows on the graph that some negative pressure exists but you did not count it.
Thank you.

[cromo]

This turbo has 2 inputs: an input receives gases from cylinders 1 and 4, another input receives gases from cylinders 2 and 3. Motors with crossplane crankshaft, like Yamaha R1 (similarly to American V8), an input would receive gases from cylinders 1 and 2, another input receives gases from cylinders 3 and 4. The explosion order is different. Plus: the path from cylinder 1 should be longer than the path from cylinder 2, same with cylinders 4 and 3 (mirror). Crossplane simplifies and shortens the exhaust system (sorry by my english from Brazil).

[mibautotecniq]

Came here asking myself what these are, left with a huge grin and a feeling that I now understand sooo much more in just a few minutes. Absolutely brilliant job, it all makes sense. Now if I can just find which method being is being employed by my company I will feel fully informed. Great job, liked and subscribed!!

[LesGainous]

I love my twin-scroll turbo on my 2015 Lexus NX 200t. Decent fuel economy, great boost power, and minimal turbo lag. Great set of turbo videos! 👍

[kfk]

I have learn a lot from his channel about car functions. If I have some money now I would make donation to his channel.

[mikemorrison]

A dealership in my city has their bmw 3 series listed as "twin turbo", when it's just twin scroll. I'm sending them this link lol

[XgamerX]

really good video but there is one thing i dont understand. so 2 cylinders are going to the large vane, and the other 2 are going to the small vane. so at high rpm, wont the 2 cylinders that are going to the small vane be super restricted and the other two cylinders that are going to the large vane wont?

[lilgnono]

I think a remake of this video and a better mic would be a great addition to this channel

[InSearchOfReality]

Awesome explanation. The incorporation of graphs and math behind it seriously helped! You quickly touched on the AR's of each scroll. Could you break them down into graphs aswell?

[DEENUTT]

Thanks for taking about pulse rate, I work a turbocharger company and you do a great job, keep it going. Thank you

[matijakovacic]

First of all, thank you for the breakdown of twinscroll and also much of other technology included in cars. I am following you through the years and i must say you my friend are godsend for the ingeneering inclined car enthusiast!

Concerning the part of the twinscroll explanation though, i dont quite understand the difference between normal - single scroll turbo and twin scroll turbo operation: If you sum the pressure pulse charts/profiles for the scrolls you basicly get to the same pulse profile as you have for a normal turbo. In my book the sum of the profiles is the same total force applied to the scroll - dips and peaks (and the addition/subtraction of them) are in the same place in time and apply the same force to the scroll, no matter which channel they came from. Am i missing something?

[Christdeliverme]

I'm proud to see that you've differentiated between divided and twin scroll.  Well done.

[theKevronHarris]

My mom's 2017 Ford Edge Titanium EcoBoost got a twin-scroll turbo and it's quiet and fun 2 drive. I'll share this video with her.