All in One: A/R, Compressor Maps, Turbo Lag, Surge, Twin Scroll, VGT, Wastegate +more

This is a video designed to save you countless hours of research if you want to understand turbo specs and features and if you're facing a dilemma when turbocharging a naturally aspirated engine or upgrading an already turbocharged engine. This video is aimed at persons who already have a basic understanding of the operating principles of a turbocharger and want to dive deeper and be able to confidently compare two different turbochargers and also understand how modifying different parts of a turbo such as the compressor or turbine wheel or the A/R of a compressor or turbine housing will impact performance. The video also explains various turbo features such as twin scroll, VGT (variable geometry turbo) as well as parts such as wastegate (internal and external) as well as actuators, bearings, and much more. This video also covers concepts such as blade design and aerodynamics, Boost Lag and Boost Threshold, and pressure ratio and explains how to easily and confidently read compressor maps. All super-condensed into just 35 minutes.

Here are the chapters and their time stamps:
00:00 A/R
04:18 Boost Threshold
05:55 Bearings
08:23 CHRA
09:07 Inducer and Exducer
13:15 Blade Design
16:00 Materials
17:16 Flange
19:00 Pressure Ratio
20:15 Surge
22:05 Compressor Map
26:50 Twin Scroll
28:47 Wastegate
31:21 VGT

As you can see the chapters are not in true alphabetic order. Instead, the video prioritizes first the introduction of more simple concepts, that can be understood independently and then introduces more complex concepts and topics and explains how the previous, more simple concepts impact these more complex ones. For example, A/R is introduced first as it is simply the geometric expression of turbine or compressor housing size. Boost Lag and Boost Threshold is introduced after this and then it is explained how changes in A/R impact boost lag and boost threshold. The same thing goes for exducer and inducer sizes and trim calculations together with blade numbers, splitter blades and other turbo wheel features as well as compressor surge. The effects of these features and their changes are then demonstrated in the compressor maps section.

I believe this video makes the Boost School series very comprehensive as I have now covered pretty much all the points of turbocharging and boost and cars. We have both the theoretical side as well as the practical side and all the key concepts have now been included, with key concepts such as turbo flutter, blow-off valves, boost control, twin-turbo (parallels, sequential, compound) receiving dedicated videos. Project Underdog covered all the practical sides, everything from turbo manifolds and required parts, to the installation itself as well as ECU wiring and basic ECU tuning.I even covered the history of turbocharging :)

A special thank you to my patrons:
Daniel
Pepe
Brian Alvarez
Peter Della Flora
Dave Westwood
Joe C
Zwoa Meda Beda
Toma Marini
Cole Philips

#d4a #boostschool

[Garage]

Me: Tries to learn everything about turbos for years.
D4A: Puts it all in one video like a boss.

[WONMARK]

a) you forgot the intro
b) we need a full video on the compressor map
c) thank you very much for this video

[Versedian]

You've become one of the few channels that is an instant click and and instant like from me. Appreciate you. Great video as always.

[wheelie]

i don't even care that much about turbo stuff, but it don't hurt to learn things and you are SO smart, it's just good for my brain to listen to you whenever possible, thx,

[Potatoauce]

Great video! The compressor map explanation has cleared up the last gap in my knowledge of turbos!

[edwardneal]

I'm so glad I subscribed to your channel. In the United States, auto shop has been completely removed from our high schools. That is a shame. It could benefit so many young people. That being said... I believe you would make a GREAT teacher! Please present more videos like this one. 👍

[daijoubu]

When I was previously researching on turbos prior to tuning, I had to go through many multiple videos and articles to learn about turbos, and now everything is summed up in just one video. It's amazing that no one has done it before, so kudos to your comprehensiveness and more importantly your ability to explain it in a way that makes it easy to understand!

[krimsono]

For anyone choosing between turbine housings - keep in mind that A/R is only ONE part of the puzzle and does not solely determine boost threshold or response. It's a significant contributor yes, but so is your tune, turbine wheel, exhaust manifold, camshafts, head flow, exhaust back pressure etc etc. There are so many other ways to improve response.
What I'm trying to say is don't be afraid of picking a larger turbine housing and/or wheel, especially if running a "large" compressor. It's also not a bad idea to leave some headroom for your future power addicted self😉

Great video as always d4a!

[Batman-nqv]

I:ve owned a turbo Volvo for the past 20 years, rebulit and modified it. And for the first time i completely understand what I've done. Absolutely brilliant tutorial!

[MattyEngland]

All your videos are excellent, but this is definitely some of your best work yet.

[erikziak]

This is likely the best video covering a wide range of topics regarding turbos, with just the right amount of information given. Thank you.

[ATomRileyA]

That was one of the most informative videos i have watched on Turbocharger sizing and such. Great work.

[caseyhanas]

There simply is no better guide for anything turbo related, bar none! Watching this 3 times over will be far more worthwhile than watching two hour's worth of the best information you can find on YouTube.
D4A (Driving for Answer's) keeps things simple, while also diving into so much detail, sometimes it'll make your head spin!

YouTube needed this a decade ago, it's a shame it hasn't been given more praise, recognition, and credibility, but all a matter of time I guess. Way to go D4A!

[riogrande]

FINALLY I can wrap my head around the compressor map.

Once again, D4A proving why he's arguably the best Automotive education channel around!

[stefanm]

Thanks Bro! I like your videos and car projects!👍

[lassebrustad]

I have no idea how, but you're able to make technical videos about engines and turbos, but so simple to understand, that I really want to watch your videos

I've learned a lot by you so far, even some things that car hobbyists around where I live doesn't even believe is true, like the EGR delete video you made

as I've chiptuned my car, but didn't want EGR delete coding, people really think it will be stuffed, but so far, my car got 208k km on it, and still running really well. 2011 VW Passat 1.6 TDi Bluemotion, manual transmission, tuned from 105 to 140 hp, stage 1

[yurrboi]

Cleared up some misconceptions I had about certain parts of turbos
Much more concise than I expected, but still explaining everything I needed to know
Great vid!
When you'd made that post about a turbo bible, I was fully prepared to sit and watch a 1hr+ long vid lol

[baseder]

Me who will probably never put a turbo or supercharger on my car: hmm, this could be usefull some day.

[Pooneil]

Very nicely done. Simple enough that an engineering enthusiast with no auto training can understand.

[WillardPekk]

I want to say thank you for taking the time to make these very informative videos! They make my projects go smoother from start to finish because you have done the hard work for me. (I.E. the research) After watching this video i will now be able to make educated decisions for my Ls 5.3 build that is going into my 85 S10.
Again, thank you so much for your efforts and time!😊
Michael,
Hoosier Daddy Motorsports.