This has to be one of the most straightforward explanations of a VVT on the internet. Really good description of how it works. DIY mechanics shouldn't be fearful of tackiing this job. Thanks for sharing

Can't thank you enough. I hv been suffering with frequent CEL n limp mode for the last 3 months. No service centre nor "expert" mechanics could diagnose the cause (even with official scanning). Their conclusion was the ECU is kaput n i ought to buy a new one. After sumbling on to ur video today i opened and cleaned the turbo myself and the issue is fixed. THANK YOU.

Important to keep in mind: the turbo spins at over 120 thousand rpm, which is 2000 revs per second. A tiniest scratch, nick or bend on the turbine or compressor wheel will throw it out of balance, meaning reduced rpm of the turbo, and damaged turbo bearing.

By far, the best video explanation I've seen of how these turbos work and why they have issues. I was hoping the notchiness I felt in the actuator moving was from the actuator rod, unfortunately it's coming from the actuator lever on the turbo/vanes. After watching this, I'm way more confident cleaning the turbo. Thanks!

makes me want to go outside and take my turbo apart!! Nice video, well explained!

Extremely nice seeing this live with no animation. Even if you already know how VNT / VTG turbos / VGT work, it's great to really see this once. Thank you!

Best turbo cleaning description so far thanks.

Thanks for taking the time to post this, very informative.

A very good overview of VNT type turbo and potential fault points. Although Ive worked on a lot of cars over the last few decades this video was a good refresher on the VNT operation.

"LIMP MODE" I subscribed instantly after you explained that, I've been having the issue you describe on my Open/Vauxhall Signum 3.0 V6 CDTI 03, I'm a newbie to turbos and all the mechanics around here say don't touch it and buy a new one but I want to learn more about the unit and how to fix it myself, brilliant video, thank you

The best video on explaining and cleaning your VNT Turbo

Great camera work, clear explanation, excellent job.

Thankyou, ive been suffering major overboost/limp mode issues, im not getting full travel on the vnt lever but i didn't understand whether up was open or closed, after watching this video i fully understand whats causing my problems.

Perfect explanation and has given me the total insight as to why mine overboosts as with vacuum connected the turbo arm moves less than if I move it manually, and I can feel it dragging inside...now I understand why....brilliant explanation thanks!

Watched the theory at 'Engineering explained' and came here to watch the practical. Bravo to both you guys! Excellent work...

A clear and practical video. Thanks for the efforts!!

Excellent stuff...! VNT Turbo has no mystery left for me now... ! ;) - thanks for your clear nd well illustrated info

Must appreciate the effort and the detail with which you've made this video. Very good work mate

A good video with clear explanations, it all makes sense. Getting at it is not so easy

Best video seen so far on this. Well explained and good lighten could see clearly. Play in control ring 👍

Superb explanation ... I'm a reasonably good home mechanic.. owning a mitsubishi L200...and didn't know exactly how these vanes work .... probably never take a turbo apart ...but it's nice to know how they operate... thanks

Just recently found your videos whrn searchinh ingo about limp mode. Best detailed car videos :)

Very clear and articulate explanation. Thanks for a very useful video.

Awesome video man! Really detailed breakdown of the Turbo. Thanks 👍

Brilliant video. Answered my question where all other forums failed, and that is "there is no wastegate in these type of turbos". I have been searching for info on the Vito 111 cdi wastegate all week after reading on the Mercedes forum that this is the the reason my Vito keeps going into limp mode. The sticky actuator is for the variable vanes not the waste gate. I wish ill informed people would keep their mouths firmly shut !!

perfectly explained! Very usefull to limit my charging problems and check the functionality of my vacuum cell

Needed this video!! Perfect video!! Just what I needed and helped me figure out that my vanes were stuck.

Absolutely excellent video ................... very good usable information !! Now i know what is wrong with my 1.7 cdti Honda when it goes to the limp mode

I just did this on my Saab 9-5 2007 and it works now. Thanks

God of turbos! Thanks for sharing the knowledge!

great job. now i have understood what is\how it works a VNT turbo.

Hi, you r good, probably the best teacher. Fantastic information & clear video. Now i can put parts to words. Will also do some cleaning on mine. Greetings from the United Kingdom!!

Very informative and beautifully presented.

Great vid thanks......gonna start pulling mine apart then clean with mr. muscle and finish with carb cleaner,hope it works.

I used Winns turbo cleaner spray. Sprayed a whole can in the turbo while the engine was on idling. Gave it 10 min took it for a spin and i can't believe it did the job. Easy cheap fix. And no service gave me this cheap option it was a last resort thing to see if it worked. They wanted me to recondition the turbo...car works fine now.

Great video thanks. Just replaced my turbo and now I know why.

Super told. For the first time i had understand how it's work. Thank you. I have a issue with a overboost. I had mounted a gauge vacuum on the line to vaccum acuator. When i press the clutch i have a little to 90% vacuum and after small pitch the vacuum drop to 20 or 10. After 100km/h, i had limp mode with error overboost. It's seems that the vane are not clossing. The actuator moves ok, but as i understand from you, i can have that gap, that keeps the vanes open a little... Hmmm, i have to dismantle... In the summer i think... Thanks again...

Wow this is the real video which i was searching for... 👍🏼

Great video. Really glad I found this. Saved my ass and turbo.

Thanks bro love from Kenya 🇰🇪👍

A very clear explenation. Well done

Thank you! How much play is too much play on the actuator arm lever in that ring?

Amazing video man.. you solved all my doubts about VNT turbos... And btw please make the video on how tthe solenoid works in This VNT mechanisms

FN amazing! I have a twin-turbo Mercedes and I will try to dial in both sides by using the adjustment nuts--if I can see them.

really excellent explanation, many thanks for helping me understand

Very informative video. Thanks a lot for your effort.

Awesome video. I am buying a 2014 with tdi. As preventative maintenance i was looking into a rebuild kit for the turbo. Found many sites saying they are not rebuild able. Some said it takes special equipment to disassemble them. Finding parts may be tough but i see i can definitely disassemble it to inspect and clean. Look pretty easy. I have has variable geometry cummins turbos apart and this looks very different but not any more complicated at all. Is the nut on the compressor wheel left hand thread on these?

I agree very good video. I have a question I took mine apart to clean it. Then when I put the ring back on that has the veins on it and tighten the screws down the veins will not move. So I wonder if I am tightening them too tight should they be allowed to float a little bit.. if you could get back to me ASAP would be greatly appreciated.

yes brilliant explanation of how a turbo works

Excellent video. My Insignia has intermittent power loss and a P003A fault code. Basically, the car doesn't know where the vane position is and goes into fault, dumping the boost. Going to use Revive Turbo cleaner and see if it works out.

Your video was very helpful. Thank you

Great video ! I have 2017 vw amarok bil turbo . Are both turbos looks like this ? And how often should I do maintenance?

If you are doing this yourself at home mark the oil inlet position on both housings before you take it apart, saves problems on reassembly.

Hi there ,great informative video, thanks for posting it ,I have a honda crv deisel that go's into limp mode on hard acceleration, also there is a whistle coming from the turbo, I have been looking for a video that explains the workings of the turbo and now I will attempt to clean the veins. Many thanks Frank

Excellent tutorial, Thanks!!

Adjusting the stop screw - how do I know where to set it? Is there a spec for the clearance between vanes? Thanks, awesome video!

Excellent and very informative!

Thanks for all this informations . Keep the good work

Thanks a lot really helpful and straightforward.

Thanks for the video . I would like to know how you take the control ring out of a 2010 vw MK5 2.0 tdi tubo. Thanks

Brilliant video, very helpful, thankyou.

excellent video...

Best video I've seen

Super video, and great eksplanation.. My 2001 vw passat, shows low boost error p1556. And got no turbo power bellow 28-3000 rpm, so it could be that the wanes are stuck at the non vacum position?? I think i havea look at the actuator and see if itmoves when vacuum aplied, how much should it move?? About 1 cm?? Cheers Johan

Another good video Chitty the forum has gone to crap since you have sold it, you link doesn't work now

Hello. Nice video man, easy way to understand what's going on inside a turbocharger. Quick question... Why am I losing pressure through the hole where the actuator lever controls the control ring? This happens only when the vacuum hose is connected

This is a fantastic video

thanks i been clean a few turbo all is done well

Is the control ring made out of brass? Thanks and great video.

Perfect explanation!!

My car goes into limp mode at low revs and is slow to accelerate. Even more so on hills.It is an 2003 e270 diesel. Does it sound like the veins are sticking to you? Great vide by the way.

At 13:09 the "control ring " is in upside down. The notch that the control lever sits in on the control ring sits between two holes. One is a "slot" and the other is a "round hole". The round hole should be on the left. I'm certain this will not allow correct amount of travel.

Can I use this turbo on a VW pertol 2L 8v? If I leave the actuator disconnected from a vacuum source, the vanes should be open to flow more freely for petrol engine's higher revs right? Then I just fit a wastegate.

man you have an exelente content congratulations!! you are the man!!!!!

The Transit is the first Turbo I've owned with a VNT. I bought a new one and had it replaced, never knowing really what it did. The magic words here were 'a VNT system doesn't have a BOV" or something to that effect.

excellent video . well explained!

Amy info on stop screw basic length so I have a start fault I rebuilt my turbo with a new cartridge and VNT unit but don't think the stop screw was set right as it shut the VNT fully

I can see clearly now ! Great video man. How often should a vnt turbo be cleaned? i drive about an hour daily, defender td5 2.5 Turbotechnics VNT turbo.

Thank you so much for this! Now it's down to sticky vains or rail pressure sensor causing me trouble.

awesome vid. thank you

excellent tutorial. thanks a lot.

Excellent video pal. What makes the Siren noise on a Turbo?

Thankyou great video very helpful

This is a great video.

Mate awesome well done

Hi I replaced a turbo core on a Toyota RAV4 and vanes were gummed up so I cleaned it and worked fine but when back on the car its low power and makes an odd whoosh noise like a dump valve ! Crazier still with pipe from inlet disconnected for vane vnt it's sounds good and revs better !! Help any ideas ?

Very informative video... Liked.

Hi, i have a 1.6 HDI DV6 206 and I had DPF issues so I sent my ECU off for a DPF and EGR delete and a stage a map to a reputable tuner. My car now boosts whenever it want to and I have engine management light and boost too high on diagnostics. The car also smokes out black smoke under acceleration. It seems my turbo is spooling and not getting rid of the pressure. Would you say this is my problem ?

i have a small leak from the vnt control lever, when i put some soap on it while the engine is on i see that there is a leak. the turbo works fine by the way. what's the problem in your opinion ? thanks :)

Must admit that I have removed the exhaust flange and filled the housing with "Mr Muscle" oven cleaning foam. Left it for a couple of hours then cleaned out with brake cleaner and an air line. Next day, refitted flange and road test. Loads of black from exhaust but it does clear.

Questions. when re-assemble the VNT turbocharge, how the minimum flow setting and the actuator calibration were done ?

Great stuff and thank you so much

Great video and thorough explanation. Thank you! Any suggestions on how to make it actuate with boost pressure vs vacuum??

Where did you go man keep educating us bro

excellent video very helpfull thank you

Hi , I having loud hissing sound when I plug in the vacuum line. It goes off when I pull out the vacuum. When vaccum line plugged the lever pulled up. I tried increasing rpm while vaccum on. The lever doesn't goes down. No much play. Hissing completely goes off if no vaccum line. What do you think about this problem. I did block my EGR from the manifold. I do suspect there is leak at egr side

Very good video 😊

Great video thanks for sharing

Very informative video, i might have a faulty turbo...

Thanks for an awesome video, well explained tutorial on this turbo unit.. I now have a clear idea what's happening to mine. A+++++