VNT turbocharger cutaway animation

This is a 3d animation of the exhaust turbine side of a Garrett VNT turbocharger. It demonstrates the relationship between the moving exhaust vanes and the exhaust turbine.

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  Autos & Vehicles

[Jon Moult]

I believe its actually called Variable Geometry Turbo

[renizer]

isn't the standard position 'normally closed', so that the vanes are closed with the actuator's spring decompressed? the small port on the top of the actuator is normally the pressure port, so in your animation that would open the vanes once it sees boost on the pressure port.

something's wrong here imho.. anyone on this?

[scrfce123]

Two different ways of referring to the same thing. The fins are technically nozzle guide vanes, and all of them together form the nozzle. Hence the name, variable nozzle turbo.

[renizer]

thanks for your attempt on clarifying the actuator, but there are actually two ports on that one. i think the vacuum actuation you're referring to is e.g. the N75 valve on the VAG TDIs, switching pump vacuum to the actuator, right?

[dopiaza2006]

These turbos use vacuum actuation controlled by a modulating valve that is controlled by the ECU. Maximum vacuum equals maximum boost. The maximum boost position is when the vanes are 'closed' as opposed to pointing more towards the centre of the turbine.

[Fredrick San Pedro]

I even taught that snail thing was a BOV or Blow off Valve. Now I realized that it was a VNT or a Variable Nozzle turbo.

[pellepuffin]

Still don't get it.

[TheFreezingM00N]

So does the VNT, like other VGTs, require an electronic controller? In the video it appears that it is simply controlled by a diaphragm similar to a wastegate actuator.

[yco67]

nice vid..

[Jon Moult]

Negitive, i understand what VNT is and what this simulation is. But you said VGT = Variable Gate Turbo, and that is false.

[judgegixxer]

I used to have a 90' Daytona with a VNT 2.2litre. That little car hauled ass as long as you could hang on to the torque steer.