Variable Geometry Turbocharger - Less Lag, More Torque!

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How variable geometry turbochargers (VGT), or variable nozzle turbochargers (VNT) work. Variable geometry turbos use vanes to alter the air flow path of the exhaust gases to maximize boost across the entire rev range. During low boost operations, the vanes create a narrow path to the exhaust turbine. As the revs increase and exhaust builds, an actuator rotates the vanes, increasing the area of the path to the turbine, and allowing for greater flow, thus increasing boost at higher RPM. Variable geometry turbochargers can make twin turbo charging systems obsolete.
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28 янв 2014

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Комментарии : 456

@mjintegrale 10 лет назад

as a mechanic of 30 years I find your videos easy & educational.I was finding vgt difficult to understand but this video has enlightened me thank you.

@EngineeringExplained 10 лет назад

Very welcome, thanks for watching!

@BirdiesGoCherp 4 года назад

I can't believe this was 6 years ago. I subbed to you like 2 years ago I think when I first came across this channel. I'm so glad there's such good explanations for stuff I'm interested in. Thank you.

@xxwookey Месяц назад

10 years ago now, and he looks so young :-)

@MyJizzyjay 9 лет назад

I find it amazing how you can explain all these different concepts so well! love your videos *__*

@thequizze1048 2 года назад

Dude you so old

@SpikesAllOver36 9 лет назад

Dude...you make things so much simpler and understandable! Great work!

@tommydmot7725 5 лет назад

You just saved my 6.6 dmax from a twin turb setup. Love how you explain things on a level that keeps things on a understandable level. Keep doin what you do bud.

@jimnyvet9386 4 года назад

I have been looking for a while for an understandable explanation of this, and I found your video. Thank you for this, even though it was from 2014, it's invaluable info. You explained it so well, I now know how this works. I have a 2018 Duramax with the variable vanes, and I really love knowing how this works. Thanks.

@RickHolland1968 3 года назад

Great explanation, am looking at a 2018 Cayman S that uses one of these turbos, on the test drive I was not aware of any turbo lag at all. I remember the last RX-7s that I believe used a small and a large turbo to solve the problem, lots of extra complexity. Thank You again.

@JacobVossFilms 10 лет назад

This was an amazing video man, absolutely loved it! Learned a lot :)

@EngineeringExplained 10 лет назад

Thanks!

@bamsuth9650 3 года назад

was

@tylereldridge6945 5 лет назад

Great video; super explanation on characteristics of VGT’s!

@Skyhawk656 10 лет назад

Always love your videos they work and explain things well. Another great job here.

@nrs6956 4 года назад

Impressive presentation as usual. Thank you.

@nithinj1991 9 лет назад

All of your videos have been truly amazing as it takes our comprehension to a whole new level :) Kudos!! Looking forward for more...

@alstein3487 4 года назад

Great easy to understand thanks!

@beomjinko 2 года назад

awesome video with amazing explanations!

@redbarron9389 2 года назад

Hands down great explanation!! Thanks!!

@Chefm4477 3 года назад

Excellent description!

@lewismoore9n3 Год назад

Great diagrams and explinations! 👏 Getting my head about my VGT turbo on my VW Polo 1.4TDI Bluemotion.

@Cumminslife 9 лет назад

They work really well! we took one from a 2012 dodge ram and installed on a 1992 12v dodge ram

@havocspree 4 года назад

Thank you jason, you are my favorite teacher.

@mychaelpierce8049 2 года назад

Great explanation. Thanks for sharing

@lvl0nk 9 лет назад

very well explained man. Keep up the good work.

@Nabiry 10 лет назад

Very concise and simply explained. Thank you very much!

@dakotaalexander9292 4 года назад

Love how you explain everything so well. Nice vedios

@saleemhaulkhory8234 3 года назад

Thank you. Brilliantly explained.

@neilxpeart 9 лет назад

Your videos are awesome, thanks!

@rakesh10741 10 лет назад

You are amazing in explaining ...and you do it in a ease...

@condicionadoar4761 23 дня назад

You are a really good explainer, thank you

@RandomName.. 10 лет назад

For those wondering vgt are used for instance in VW TDI's since VW mk4 to date.

@akshay.pawar00 8 лет назад

awesome video! Gave me all the required knowledge abt the topic. Motivated me to do research on this topic. Studied the whole topicthroughly. Made Review Paper on study variable geometry turbochargers. Gave a seminar on VGT. Thank u so much for inspring the Mechanical Engineers!! you are doing a great job 👐👍👏👏👌😀

@haririalaa6487 9 лет назад

great explanations..! keep up the good work :)

@dazlad1972 Месяц назад

Finally.... someone who actually explains it properly. Thanks bro....been looking for ages. Don't suppose tou know how to reduce the boost on a vw tdi vnt turbo.

@vivid_paladin3015 4 года назад

first video I watched definitely subscribing

@benoitperrault6805 6 лет назад

Love the diagrams!

@chickenonugget2269 3 года назад

This really helped me understand what’s wrong with my turbo, I already know the vanes are seized but I didn’t know what the vanes were and now I do

@lordieshepherd 6 лет назад

Thanks. I have a much better understanding now

@kekegeiger9888 9 лет назад

love how his boost vs. rpm graph looks A LOT like a torque curve comparison between Evo 3 and 1-series ///M. nice video btw.

@DestDroid 10 лет назад

Great video!

@markjmaxwell9819 5 лет назад

Very nice explanation as usual. I was just doing some research on variable pitch ducted submarine propellers. Similar principle with the variable pitch for optimal performance at various rotation rates. Also changes the acoustics and cavitation. While the duct increases the efficiency and lowers the cavitation. But the added mechanical complexity does have it's drawbacks.

@locnguyentan1657 7 лет назад

thanks a lot for the detailed explaination! :D

@abdullahmohammed2955 28 дней назад

i love you man, i always do thanks for your help

@allajunaki 10 лет назад

Fantastic! I always knew the basics of a VGT, but most of the other explanations on the web conveniently left out on how the Vanes are actuated. This is why I watch your videos, there is always something new to be learnt, even on topics which you already know. Armed with a Board, you manage to teach better than most of the videos with fancy animations. Keep up the good work!

@EngineeringExplained 10 лет назад

Haha thank you! I make do with what I have - in as timely of a manner as possible.

@dennismendoza4208 Год назад

@@EngineeringExplainedwhat controls the linear actuator of the vgt is it the ECM? 🙏 Thanks

@prabodhsam4083 7 лет назад

I loved it man ! thanks a lot got my advanced IC engines paper tomo

@kevpinder6821 2 года назад

Well done young man for helping me in plain english understand this concept.

@ts31966 2 года назад

Excellent video! Please make a video talking about new turbo technology.

@Chaiyapol111 8 лет назад

very clear explaination

@ayushgupta5061 7 лет назад

very well explained !

@edgartavares2353 10 лет назад

dude youre awesome, it makes perfect sense

@FireBird7766 10 лет назад

Wow, that's really neat

@bloodprince143 4 года назад

I am an finance grad and i got this perfectly well! Good stuff

@timofeyryzhuk3245 4 года назад

good job, young engineer

@king.dannyman 10 лет назад

Nice to get to know this better, I've always thought that this turbos are great for high boost and high horsepower aplications. The only con is that I think is too expensive, i don't know. And making the setting of the variable nozzle for the correct spooling performance might get tricky. Keep up with this videos

@angelesdy6738 5 лет назад

Well explaine sir. This vgs turbo charge is use in isuzu d'max and mu-x. I' m from philippines. Great innovation . Keep up the good work sir 🤘👍😎. God bless you

@kowalskielbeh7005 10 лет назад

Great video thanks.

@physicsudel2013 4 года назад

Awesome vid explanation. Seems alot of car manufacturers just PID the wastegate. however I was surprised to come across vehicle repair video where a diesel engine had a variable turbo.

@titusklumper 10 лет назад

Very nice video! Perfect explanation! I like to point out the biggest con. of a VG-turbo: It's nowadays only used in diesel applications because of the lower ignition temperature. The module with the vanes is called the Nozzle and the vanes won't be able to handle the higher temperature of gasoline. Nevertheless I'm working on a gasoline VG on my design team. The newest VG's use a rotary actuator mainly because they are smaller.

@R.B_B Год назад

9 years later. I'm look about VGT turbos in gas or Ethanol engines. How you project goes?

@Unb3arablePain 10 лет назад

What's also great about this system is that it splits the turbo, making it more shielded from heat.

@ladjkaoz 10 лет назад

Nice vid... bro...

@schman111 8 лет назад

Dude, big fan of your channel...just wanted you to know your RU-vid videos pop up consistently (googling) when trying to educate myself on various parts of cars engines and turbos. just wanted to say hey...and thanks for the awesome informative content. high 5 ✋

@EngineeringExplained 8 лет назад

+matt o'malley Really appreciate it, thanks for watching!

@schman111 8 лет назад

+Engineering Explained I almost gave u the "verbal tip" (serving industry), with the compliment, the high5 and NO like. liked. Thanks for the reply

@manuelzamora8465 7 лет назад

Thanks so much

@nandhatobby7208 6 лет назад

explanation is good.

@fatsuit7469 10 лет назад

thank you alot thats was very helpful just started my job in the diesel field i know alot about turbo's but this made me step my game up thanks again homie -cam

@falikoukhalilfofana9554 4 года назад

Thank you.

@GaneshKumar-ch2dk 7 лет назад

nice explanation, Can you make an lecture about "Turbocharger testing methods" like gas stand test

@Missosalty 10 лет назад

I just wanted to know if there should be some way of compensation maybe some other variable startors on the inlet side because it seems there would be some inefficiency for both the high and low rpm for the turbo in the hot section as compared to the intlet side as it travels through both the settings..

@amerfuad 9 лет назад

thanks alot ..

@papaD97 10 лет назад

Video idea: 5 stroke engine concept. You just make everything easier to understand, which is why I follow!

@amritbhowmick8310 10 лет назад

Thanks dude...

@RapsheetRecordsLlc 5 лет назад

Thanks buddy

@InSearchOfReality 10 лет назад

Great video! Maybe add a link to cut-away photo's of VGT/VNT?

@thesmellyranga 9 лет назад

All this stuff is so damn interesting

@MrIrrepressible 10 лет назад

Nice vid as usual. Have u done a vid on wheel spacers?

@EngineeringExplained 10 лет назад

Thanks, nope.

@Gomathisankar10 10 лет назад

Thanks for the video man. In VGTs to which the actuators are connected??

@mafosa8519 9 лет назад

ok thanks. I couldn't find it in your channel. I'm looking for that style turbo with a carbon seal though. any hints on where I could find one? draw through "set up" larry

@revanthaliasmikesteel2742 5 лет назад

Tqsm bruh

@MOHITSHARMA-lr7ii 10 лет назад

GOOD ONE

@cmiddleton9849 6 лет назад

Could we have a video on a vnt and how they deal with over boost using the egr valve

@SUVODIP1000 6 лет назад

Great...but can u please upload a video on Volumetric efficiency and it's impact on torque and also about valve overlapping and it's impact on low to high rpm

@The_Soggy_Orphan 10 лет назад

Can you please do a video on rear mount turbos!! Been thinking about doing it but not exactly sure how effective they are compared to alternative options. Engineering Explained

@fahemabdelmalek5655 3 года назад

Excellent explanation, I have one question, this kind of turbo works at idle?

@purushothamansrinivasan7420 3 года назад

Thanku

@richb954 10 лет назад

Hi, how does VGT affect the design of the exhaust headers, and the exhaust after the turbo? So, as exhausts are a balance between low rpm scavenging and high rpm total flow, does VGT make things easier or harder to get a balanced system across the rpm range?

@KatanaBart 6 лет назад

Had a question but don't know where to ask. Would it be possible to install a fan, driven by the engine (like a supercharger) but placed into the exhaust PULLING it through and creating negative back pressure? Would you need a way to cool the exhaust or anything else first? Issues with the cat?

@RobertGracie 10 лет назад

My Dads 2002 Saab 9-5 Hot Aero Estate has a Variable Geometry Turbocharger in it and it pulls from 1800rpm right up to 4000rpm thats when the turbo is at its sweet spot I believe although the revs could be higher I need to check that out!

@trevorcox3744 9 лет назад

Hi, I was doing some research on these and the companies that make these turbos have them for diesel engines. Do you know if such a turbo would be available or useful on a 2.4L theta II i4 engine? Thank you for your time.

@abhinavyadav5475 6 лет назад

On which readings actuator works does it function on from exhaust gas speed or from exhaust gas capacity??

@Malacsult 10 лет назад

Great explanation! I'd suggest you reviewing centrifugal clutches (like the ones in pocket bikes and such), since theres not really a good one on YT,

@EngineeringExplained 10 лет назад

Did a project on those in college, they're pretty cool devices.

@aymanalmateeg 10 лет назад

Awesome

@darcar7319 9 лет назад

Very good video to get the big picture about VGT. Stuffs explained in simple ways like you did shows a deep understanding of the subject. Keep submissing videos please. Congratulations!!! P.S.: I want to know who are the fourteen moron who didn't like this video LOL

@adminjohn4336 10 месяцев назад

First I like your videos, thank you. Pls help me. I have a VN turbo and a vacuum operated actuator. When the engine is NOT running are the vanes widest open? When the engine is running idle, vacuum is applied and the vanes are smallest. Is this correct? What is happening when I shorten the axle stetting? People say that it will give quicker boost? But what will happen with the top end power?

@IhorVasutyn 6 лет назад

Great video and explanation. I feel like on 2.29 left image represent high RPM situation not low since you have a lot of gas and you need to close variable valves to let high pressure gas flow around turbo. Right image for low RPM since use all exhaust gas to rotate turbo (valves are opened)

@mcanderson0 4 года назад

I came here to say this

@dominici951 9 лет назад

From what i have seen, there are only Diesel VGTs and manufacture specific OEM VGTS. Are there any aftermarket performance brands that carry this type of turbocharger that can be put on any car?

@zmanmd1641 5 лет назад

Could a boost powered actuator be used to open and close the vanes instead of electricity? That way the vanes respond directly proportional to the boost and not to a signal. At low power a spring pulls them closed, then as boost builds it pushes a piston to open the vanes and allow more boost until full boost is reached and the vanes are fully opened. At liftoff throttle, the vanes start closing as boost falls keeping exhaust flow at maximum velocity for all conditions.

@bluelightningfilms57 8 лет назад

Just curious, is there an advantage to using one large turbo vs. two smaller turbos? Or two of the same size turbos? Basically twin turbo vs single turbo.

@macaron3141592653 8 лет назад

VGT is love, VGT is life

@MrGsteele 3 года назад

Perhaps I misunderstood; it seems like the vanes would be open wide at low rpm, to maximize exhaust thrust (assuming wide open throttle, low rpm) in order to spin up the turbine wheel quickly, eliminating lag; then, at high rpm, to eliminate overdriving the turbo, you'd close the vanes to keep turbo speed within rational limits, bypassing the hot side turbo wheel and venting directly to the exhaust.

@thejezta 7 лет назад

hi mate I know this is an old video but can you explain the stop screw on the vnt turbo I had to replace my turbo on my audi a4 b5 1.9tdi and all was great untill I got limp mode after taking off the turbo again I found out the stop screw had rattled it's way down to the pivot arm for the vanes rung so I unscrewed it out and put lock tight on it now my car is fine but it's not as quick as it was do I need to adjust the screw out more or screw it back in a tad ?

@tomy8339 5 лет назад

Could you combine a VTG turbo with Mazda's variable inlet? That is, at low revs, the vanes are closed and the inlet to the vanes are restricted, further increasing the speed of the exhaust for instantaneous spool up. At high revs, the opposite.

@troyharshberger3589 10 лет назад

Sweet video. Wouldn't a VGT have a lower peak boost than the fixed though?

@vsagikom 7 лет назад

hi I have narrowed down to 2 diesel cars which I'm planning to buy. The torque and bhp figures are almost the same but one has variable geometry and the other one is fixed . which one sud I buy? and how of a difference does it has when it comes to driving pleasure since one is VGT and the other one isn't?