How does tdi turbo work

The air then enters the combustion chamber. Here diesel is injected directly into the cylinders through a nozzle at an extremely high pressure, which breaks it down to a very fine mist. So, what does this mean for drivers? The result is a cleaner environment as less pollution enters the atmosphere. The latest generation of filters operate without additives. This makes them maintenance -free for a long time: an initial inspection is not usually carried out until after 90, miles. Their lifespan is dependent on factors such as fuel quality, driving style, use and oil consumption.

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The filter's lifespan is dependent on factors such as fuel quality, driving style, use and oil consumption. Our current 3. The name of the engine derives from its compact shape - six cylinders, three to a side, angled in the shape of a 'V'. Drawing on the virtues of the outgoing unit, the V6 3. The result is a significant gain in performance, with the time taken to accelerate from 0 to 62 mph clocking in at 7. Brake energy recuperation saves and stores the energy that would normally be lost during braking and uses it for starting and acceleration.

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TDI identifies all our advanced diesel engines using direct fuel injection and a turbocharger. Log in. For a better experience, please enable JavaScript in your browser before proceeding. How VNT turbo works with vacuum. Thread starter ktone Start date Mar 25, I've been looking for an answer for this very basic question but I haven't been able to find one anywhere. If there is already a thread on this then please direct me to it. Boost increases with vacuum applied.

PakProtector Veteran Member. Applied vacuum pulls the Variable Nozzle vanes to the closed position. Let it off and they should return to wide open position. In the Garret, closed is down against the stop screw and open is up. I too have similar questions, so some more explination is requested. When idling should I see full vacuum, or no vacuum? Are the nozzles fully open or fully closed at 0 vacuum? As my rpm increase and my power demand increases the ECU reacts by demanding change in vacuum to move the vanes, is it closing the vanes to prevent overboost or opening the vanes to request more boost?

Mind you I am an engineer and have been working on diesel engines my whole career but have little experince with VGT turbos, only fixed and waist gated turbos.

Last edited: Mar 26, Here's a interesting video on the VNT turbo. RacerTodd Veteran Member. My recollection is that at idle you see full vacuum vanes closed. The purpose of opening and closing the vanes is to control the speed of the exhaust stream, which controls the shaft speed which thus controls boost. With a non-VNT turbo, when you accelerate briskly from a stop the shaft doesn't spin up very fast because there isn't much energy in the exhaust stream.

You sense this as "turbo lag", a gap between hitting the throttle and getting big power. With a VNT turbo, when you hit the throttle the vanes are closed down. This accelerates the exhaust, making the shaft spin up faster than in the non-VNT turbo.