VGT/VTG regeneration – what is worth knowing?

Do you have vehicles equipped with VGT turbochargers in your fleet? Find out what distinguishes this type of turbochargers, how it affects engine operation and how to detect their fault. Check why it is worth to bet on remanufactured VGT turbochargers and how their regeneration process works, and also see for yourself. Find out why it is worth choosing remanufactured VGT turbochargers from the Arcoore offer.

 

 

What is VGT/VTG?

 

 

VGT (Variable Geometry Turbocharger) is a turbocharger with variable blade geometry. This type of turbocharger allows you to regulate the flow of air to the drive unit by changing the angle of the turbine blades. How is it better than fixed geometry turbochargers?

VGT turbochargers are able to adapt their operation to changing driving conditions, thus ensuring optimal air pressure supplied to the engine for the period of operation of the unit. Meanwhile, the performance of fixed geometry turbochargers depends on constant air pressure and flow. VGT models adapt to changing driving conditions and maintain optimal air pressure, resulting in improved engine performance. It is because of these benefits that VGT turbochargers are used, among others, in in trucks or construction machines, which require high efficiency of the drive unit.

 

 

 

The most likely faults in the VGT/VTG

 

 

VGT turbochargers are components that consist of various components. Individual of them may be subject to wear or mechanical damage, as a result of which the entire subassembly will not work properly, which will translate into deterioration of the engine’s operation quality. Faults that may occur within the VGT include:

  • damage to turbine rotors;
  • compressor impeller damage;
  • leak, resulting in oil leakage;
  • damage to actuators;
  • damage to sensors or other electrical and electronic problems.
 

VGT/VTG failure – symptoms

 

 

VGT faults are quite easy to notice due to deterioration of the engine’s operating parameters. Most often they concern performance and operation. Of course, the ultimate cause of irregularities is easiest to recognize after connecting the vehicle to the diagnostic computer.

The most common symptoms of VGT damage include:

  • loss of engine power, most often when accelerating or driving uphill;
  • increase in fuel consumption;
  • feeling vibrations and vibrations, especially when driving at high speed;
  • excessive smoke from the exhaust pipe;
  • engine light on the dashboard comes on.

The presence of any of these symptoms may indicate a failure of the VGT turbocharger. If you notice them, immediately connect the vehicle to a diagnostic station or go to an automotive service. If a fault is found, it may be necessary to replace or regenerate the VGT.

How does VGT/VTG regeneration work?

 

VGT regeneration is a process aimed at restoring a turbocharger of this type to its original technical and functional properties. In order to regenerate the VGT, first remove the entire turbocharger, then disassemble it and thoroughly clean each of its elements, e.g. turbine, compressor and other components.

After thoroughly cleaning all parts of the VGT turbocharger from oil, soot and other contaminants, their technical condition should be carefully assessed. This applies, for example, to impellers, blades, actuators, sensors and seals. The specialist decides whether the part is repairable or should be replaced with a new one. In case of damage to electronic components, such as e.g. controllers or sensors, they should be replaced with new ones.

After the VGT components have been repaired or regenerated, it is time to reassemble the turbocharger and test and verify its performance and functionality.

 

VGT/VTG repair – how much mileage is enough?

 

VGT repair is a process that restores your elements to their original functional, technical and quality properties. Therefore, regenerated turbochargers of this type are able to work properly even for several hundred thousand kilometers.

The useful life of this element depends, among other things, on on the quality of the regeneration process or the way the vehicle is used. To extend the service life of the repaired VGT, remember about:

  • regular oil and filter replacement;
  • cooling down the turbine before shutting down the engine;
  • correct driving, i.e. not pressing the accelerator pedal to the floor at low revs;
  • waiting about 30 seconds after starting the engine (during this time the oil will be thoroughly distributed over all parts that make up the VGT).

 

VGT/VTG repair or replacement of parts for a new one?

 

If only VGT regeneration is possible, it is worth choosing this option. The long-term effects of VGT repair and significantly lower costs are an argument that encourages owners of many vehicles to this solution.

It is also worth buying a remanufactured VGT turbocharger. At Arcoore, we offer high-quality regenerated VGT for many models of trucks or construction and agricultural machinery.

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