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.
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!
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.
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.
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!
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!
"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
Personally, I would find a replacement out of a salvage yard. Then take that one apart and study it. Clean it and buy a rebuild kit. Then when you take your old one off you already know what you need to do. Good luck on that beauty!
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
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!!
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
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 !!
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...
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.
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
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.
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.
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.
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.
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?
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
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.
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.
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
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
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
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 ?