Turning a pressure vessel on a VNT20...

Hello,

I want to relocate the pressure sensor from the VNT20.
I'd like to ask if anyone has done this before, and what I should be aware of.

I've already figured out this much, but I'm not sure what is meant by the 'entire VTG ring.'


The exhaust side needs to be rotated, including the entire VTG (Variable Turbine Geometry) unit.
Some people claim you can't turn them, but that's not true; you just have to...
1. Carefully open the exhaust housing.
2. Remove the entire VTG ring and screw it back in one position further.
You can then simply screw the pressure vessel onto the next hole.

Regards,
'Dj'

I've attached another picture.
Do I need to loosen the screws that I've circled in red, or just rotate the VTG ring (blue)?


Regards,
DJ

HI,

A quick question: Were those grease stains already there from the factory?

Thank you.
martin

HI,

A quick question: Were those grease stains already there from the factory?

Thank you.
martin

I have no idea; the image is not mine.
I will be careful not to open my VNT20 until I know how to properly adjust the pressure sensor.


Regards,
Okay, hier ist die Übersetzung:

'Dj1'

Okay, I've taken a closer look at the VNT20 .

Since I want to install a turbocharger on a Golf 3 AFN, I need to rotate the pressure sensor so that it points upwards.

I disassembled the turbo today.
When I removed the exhaust housing, I immediately noticed that it doesn't use the Mozz hex screws that hold the entire VTG ring in place, but instead uses Torx screws (see picture 2).
I thought there wouldn't be any other differences, but there are!

and namely:

To rotate the pressure sensor, it is necessary to completely disassemble the compressor and exhaust housing.
After that, unscrew the entire VTG ring (3 screws) and then screw it back on, but one position further.

This applies to all VNT20 models where the three screws that hold the VTG ring are symmetrically arranged (see image 1).

They don't fit with mine! That's why only 2 screws fit the VTG ring. Well, I can't just leave it like this...

You could now drill a hole with a thread and screw the third screw in there (see picture 4), but will that cause any cracks?
I generally don't like drilling into exhaust housings.
What do the experts say? Can I cut such a thread into the exhaust housing without any negative consequences?

Regards,
DJ

Hello...

Wouldn't it be advisable to drill the holes?

In picture 2, you've drawn red circles...

If I align it correctly, it should work like this...

I hope I'm not wrong now .

Hello...

Wouldn't it be advisable to drill the holes?

In picture 2, you've drawn red circles...

If I align it correctly, it should work like this...

I hope I'm not wrong now .

Which holes should I drill?
Only one hole is no longer working when I turn the VTG ring.
And even if I drill it, it won't be better, because I need the hole with the thread to be shifted about 1 cm to the right (see attached image).

Regards,
DJ

No, that's not what I meant.

Look at this...

[img][/img]

If you drill a new hole, I don't think anything should happen.

Unless the holes are intentionally placed..., but I can't see that in this photo...
Best regards,
Michael.http://www.mhernach.com/fotos/galaxy/6b.jpg{MARKER}

Okay, after a lot of consideration, I've decided to leave the turbo as it comes from VW, or as it is originally.

If I keep it as is, I'll have to redesign my adapter.

My question:
Is it a problem if the exhaust gases have to travel a short distance upwards before reaching the turbo?

I imagine it's something like what's shown in my sketch (see attachment).
What do you think about it?

Please provide suggestions and tips.
Sure, here's the translation:

'Thank you in advance!'

Regards,
DJ1

Nice drawing .

Well, I suppose it would be better to position the turbocharger as close as possible to the cylinder.

But it could also work that way.

Why do you actually want to move your printer, don't you have enough space?

Best regards,
Michi.

dj1 wrote:

Is it a problem if the exhaust gases have to travel a short distance upwards before reaching the turbo? I imagine it's something like what's shown in my sketch

.
Hi,

"By adding an additional pipe section, the contribution of pressure waves to the engine's drive system will likely be reduced, as the pressure waves from the individual cylinders will dissipate within the additional volume of the pipe." Translation: The turbo lag will become even more pronounced, something that was already unavoidable due to the switch to the VNT20.

Are you rotating the loader on your machine relative to its normal mounting position?
If the oil flow direction through the pump (normally from top to bottom) is significantly altered, I'm not sure if this could cause any problems.

Okay, so, is the VNT20 the one I have installed, or am I mistaken? If so, on mine, the exhaust manifolds are inside the downpipe, and the turbo is mounted on top of it. The turbo "sits" between the two cylinder banks, higher than the exhaust manifolds. It's similar to your drawing, and your pipe bend is my downpipe. The mounting position of the turbo also seems to be the same. Therefore, it probably won't be a problem.

Hello everyone,

@mhernach:
Since I'm not going to use a turbocharger with a wastegate, I need to build the turbocharger exactly as it is in my sketch.
Make sure the oil drain, inlet, and pressure sensor are all facing the correct direction.

@Ulf: Initially, I wanted to rotate the compressor housing and then install the turbo in the same way as the original VNT15 was installed. Since modifying it like that would be too complicated and too dangerous for me, I'll leave the turbo as it comes from VW and try to adjust everything else.

I'm trying to make the adapter as short as possible.
I'm very excited to see how it performs.

Thank you for your tips!

Regards,
DJ

So, the VNT20 is the one I have inside, or am I wrong? If so, in mine, the exhaust manifolds are in the downpipe, and the turbo is on top of it. The turbo 'sits' between the two cylinder banks, higher than the exhaust manifolds. It's similar to your drawing; your bend is my downpipe. The mounting position of the turbo also seems to be the same. Therefore, it probably won't be a problem.

Hi,

Can you please send me some photos of your installed turbo (VNT20) in the engine bay? That would be very interesting to me.
Perhaps also from the exhaust manifold or the downpipe.

Thank you in advance!

Regards,
DJ1

Sure, I can do that. I'll send you a direct message (DM) once I've done it. I have no idea if it will help you. I'll definitely remove the engine cover. I'll also remove the metal plate on the turbo. However, even then, you won't have an optimal view, and I won't disassemble my car any further. I'm glad it's finally running again . Also, check out 3,2,1. Sometimes, you can even find trouser legs with prints on them.

@Mr. Antje:

hey, you don't need to completely disassemble your car .

Take off your cover and take some pictures, it will be fine .


Best regards and thank you.
DJ