Variable Geometry Turbocharger - Less Lag, More Torque!
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- Опубликовано: 28 янв 2014
- 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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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.
Very welcome, thanks for watching!
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.
10 years ago now, and he looks so young :-)
I find it amazing how you can explain all these different concepts so well! love your videos *__*
Dude you so old
Dude...you make things so much simpler and understandable! Great work!
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.
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.
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.
This was an amazing video man, absolutely loved it! Learned a lot :)
Thanks!
was
Great video; super explanation on characteristics of VGT’s!
Always love your videos they work and explain things well. Another great job here.
Impressive presentation as usual. Thank you.
They work really well! we took one from a 2012 dodge ram and installed on a 1992 12v dodge ram
Thank you jason, you are my favorite teacher.
All of your videos have been truly amazing as it takes our comprehension to a whole new level :) Kudos!! Looking forward for more...
Great easy to understand thanks!
Very concise and simply explained. Thank you very much!
Love how you explain everything so well. Nice vedios
Great diagrams and explinations! 👏 Getting my head about my VGT turbo on my VW Polo 1.4TDI Bluemotion.
For those wondering vgt are used for instance in VW TDI's since VW mk4 to date.
You are amazing in explaining ...and you do it in a ease...
Hands down great explanation!! Thanks!!
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 👐👍👏👏👌😀
Excellent description!
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
very well explained man. Keep up the good work.
awesome video with amazing explanations!
Thank you. Brilliantly explained.
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
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.
Great explanation. Thanks for sharing
Love the diagrams!
Well done young man for helping me in plain english understand this concept.
Your videos are awesome, thanks!
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!
Haha thank you! I make do with what I have - in as timely of a manner as possible.
@@EngineeringExplainedwhat controls the linear actuator of the vgt is it the ECM? 🙏 Thanks
Thanks. I have a much better understanding now
I am an finance grad and i got this perfectly well! Good stuff
You are a really good explainer, thank you
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.
first video I watched definitely subscribing
very clear explaination
What's also great about this system is that it splits the turbo, making it more shielded from heat.
great explanations..! keep up the good work :)
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.
I loved it man ! thanks a lot got my advanced IC engines paper tomo
thanks a lot for the detailed explaination! :D
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
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.
Dude, big fan of your channel...just wanted you to know your RUclips 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 ✋
+matt o'malley Really appreciate it, thanks for watching!
+Engineering Explained I almost gave u the "verbal tip" (serving industry), with the compliment, the high5 and NO like. liked. Thanks for the reply
Great video!
very well explained !
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.
9 years later. I'm look about VGT turbos in gas or Ethanol engines. How you project goes?
dude youre awesome, it makes perfect sense
Excellent video!
Please make a video talking about new turbo technology.
Wow, that's really neat
i love you man, i always do thanks for your help
good job, young engineer
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
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!
Thanks so much
Great video thanks.
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.
Thank you.
explanation is good.
nice explanation, Can you make an lecture about "Turbocharger testing methods" like gas stand test
Thanks for the video man. In VGTs to which the actuators are connected??
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)
I came here to say this
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..
Tqsm bruh
Video idea: 5 stroke engine concept. You just make everything easier to understand, which is why I follow!
Hard to believe this can be made reliable with all this going on at exhaust side temps and 100K rpm, but apparently they do it - wild!
Excellent explanation, I have one question, this kind of turbo works at idle?
Thanks buddy
All this stuff is so damn interesting
Thanks dude...
thanks alot ..
Nice vid as usual. Have u done a vid on wheel spacers?
Thanks, nope.
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
Could we have a video on a vnt and how they deal with over boost using the egr valve
Nice vid... bro...
Thanks for the video!!! Could you ameke a video about adjustable compression ratio engines?
Perhaps eventually!
Sometimes when you think the turbo is blown the ring and vanes are just sticking usually due to combustion deposits. It often whines a lot more when this happens and you notice much more lag depending on where they are stuck.
Great video! Maybe add a link to cut-away photo's of VGT/VNT?
VGT is love, VGT is life
Man these things sound awsome! Do they use these in F1?
I'll never understand how the inside of a turbocharger stays clean enough to work. Imagining a hole with hot air blowing through it and managing to stay clean is beyond me.
... I bet Mr. Hankey could explain it to me.
You just answered your own question, there's air blowing through the turbo the whole time, and the speed by which travels won't let any residue stay in there.
What Sn1pest3r said, and I have an air filter on my engine that filters the air to prevent debris and other crap from entering the system.
And it is really hot in there so stuff don't stick
tfw when my 05 Tanky Avensis has this and yeah its fun hear it spool
Thanku
The Bosch VGT seems to work on a different principle, as a boost limiter. It appears that at low RPMs the vanes are closed to provide maximum airflow to the turbine wheel. However, as RPMs increase the vanes open to act as a waste gate and prevent over boosting.
drkjk as far as I know the same applies to KKK.
GOOD ONE
do the bearings, connecting link , and pivot point have lifetime ? i mean do we have to replace them over time ?
those vanes open to prevent overboosting at high rpm and not because you want more air as you said.
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
Sweet video.
Wouldn't a VGT have a lower peak boost than the fixed though?
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
I have a question which turbo would you find more affective the Variable Geometry Turbo or VW's recent turbo chargers that reduce the turbo lag with the electronic wastage actuator and water cooling intercooler ?
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?
excellent,very clear .viva mechanical engineer :)
Los ingenieros mecánicos!
On which readings actuator works does it function on from exhaust gas speed or from exhaust gas capacity??
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,
Did a project on those in college, they're pretty cool devices.
Are these turbos as reliable as a standard turbo. Also are they used in any production cars or is it more of a race car turbo?
Would meth/water injection help lowing the exhaust temp to help this turbo work in gasoline engines?