Ansaugwege entdrosseln beim Golf 3 - Tip | Posts 16+

Hi Dieselmartin,

Measuring the pressure within the airbox is, in my opinion, almost impossible with a naturally aspirated airbox. Even with professional measurement technology, it often yields only limited useful results, as the pressure conditions inside the enclosure can significantly distort the measurements.

The accuracy of your pressure gauge will be limited by the pressure being measured, which further complicates the situation.

My suggestion is to take a measurement just before the compressor. This is also the critical measurement point for ATL stress (axial bearing load/compressor pressure ratio).
The absolute values are also somewhat higher here (approximately 150 mbar at Pmax). It is advantageous to use a ring-shaped measurement point or a perforated hook probe in this case to avoid measuring any components of the stagnation pressure.

Greetings.

For the sake of completeness, I'm adding this here.

Okay, I'm ready. Please provide the German text you want me to translate.
Regarding the measurement at the air filter housing @dieselmartin

Andy280 wrote:

The vacuum pressure at 4000 1/min in the air chamber is 30 mbar. The filter box, including. Zuleitung was developed by us. It took me a little work to figure this out. Hi Andy

I retract my previous statement that a VR6 engine consumes less fuel.
I forgot the speed.

A 4000 RPM TDI engine with 1.1 bar of boost produces less airflow than a 6000 RPM VR6 engine (assuming the same volumetric efficiency in both cases).

15960/2 to 16800/2 (liters per minute).

m;
more to come

Here's my TDI van and one from a G3 Cabriolet gasoline model (identified by part number 1E0 129 607).

"Interestingly, the obvious use of identical components is noteworthy."

Now I understand why the intake manifold ends up so nonsensically angled in the engine bay: Because it doesn't matter, and it has to be that way on gasoline engines for the warm-air bypass valve.

It's also interesting that the gasoline-powered Golf and the gasoline-powered Golf Cabriolet have different engine blocks. The difference is likely only in the bulge in the intake manifold. It's not available on the VR6 van either.
It's probably only for the H4 headlights, and the Cab and VR6 models were only available with dual headlights.

Reverse engineering is really fun .

m;

Assuming a fill level of 1 in the cylinder and a boost pressure of 1.1 bar, the air velocity at the intake manifold would be 95.92 m/s, which is equivalent to 345 km/h.

In the upper section of the LuFiKa, the "inventors" somehow managed to incorporate the unrestricted TDI engine.
If you take a look at the "trumpets," you'll notice a difference.

I'm currently driving a TDI van without the "Rüssel" (snorkel) in the fender.

- minimally louder (slightly rumbling, but you can barely hear it with the third, broken flexible hose).
- I would say it's a bit more eager to rev, especially in the low-end suction range before the turbo kicks in (so, in the typical city driving range of 1000-1700 rpm).

m;

dieselmartin wrote:

Now I also know why the suction nozzle ends so nonsensically slanted in the housing: Because it doesn't matter, and it has to be that way on the gasoline engine for the warm air recirculation.

The VR6 engine does not have a warm-up air bypass valve. Images will follow next week.

Herr Antje wrote:

Pictures will follow next week.

Unfortunately, the quality is a bit poor, and the preview image is a bit too large. If anyone can tell me how to do it better next time, please let me know.

VR6, manufactured in 1993:

The nozzle doesn't have that bulge, but rather a beveled edge, and for the dual headlights:

Thank you for the pictures.

I once packaged it in a way that was modem-friendly .

It's interesting that the nozzle is screwed on. It's clipped on for the other G3 models.

Furthermore, the air intake duct ends at the air filter box wall, unlike the TDI engine where it first enters the engine compartment (where the warm air flap would be located in a gasoline engine).

Overall, the VR6 lower engine mount seems like a fast and perfectly fitting part, designed to make the life of a TDI engine easier (assuming you don't have any issues with the bracket near the headlight).

The bump seems to be for the LWR (likely referring to a specific system or component).


On the other hand, the TDI doesn't have a fuel filter in the same location as the VR6, so you could potentially draw fuel from there, but you would need to use a large DN70 drain pipe.

m;

dieselmartin wrote:

1) I once packaged it in a way that was modem-friendly . 2) It's interesting that the nozzle is screwed on. It's clipped on for the other G3 models. "Overall, the VR6 manifold seems like a fast and perfectly fitting part that can make the job of a naturally aspirated engine (like a TDI) easier (assuming you don't have any issues with the bracket near the headlight)." 4) On the other hand, the TDI doesn't have a fuel filter in the same location as the VR6, so you could also draw fuel from there, but then you would need a large DN70 drain pipe.

Thank you!
2) No idea, but I suspect it's original as is. Clipping doesn't do anything here, but it could have been added later.
3) Aren't the headlights the same size, or are they larger because they're double headlights? Also, is the air intake at the end larger than the one on the other gasoline engines mentioned in this post? It doesn't taper to a point, but rather remains more or less the same size.
4) Sprittfilter, since this is a diesel forum . It would be a good quiz question. A tip: The fuel filter is located near the rear axle, but it still has something to do with fuel (gasoline) .
Sorry, I couldn't resist.

I know, I know, snip, snip.

Activated carbon container.

Hello everyone!

Here are some real professionals at work. I wonder if no one has ever...
came up with the idea of extending this intake nozzle into the filter box.
was sucked in, possibly from spray kicked up by the vehicle in front, could be drained away through the small...
The water takes a detour in the filter box, gets stuck on the walls, and then drains away.
instead of freely getting the filter wet.

(A wet filter likely creates even more vacuum pressure before the turbo.)

Having studied fluid dynamics, I can say that the higher...
Mass of water droplets during the change in flow direction at the end.
due to the extended suction nozzle, most of the moisture remains clinging to the walls.
While the air can flow upwards, towards the filter.

If I'm completely wrong about this idea, please correct me.
This has, at least until now, prevented me from extending the...
To cut off the suction cup.

Best regards.
Peter.

At these flow rates, I highly doubt that water would "stick to the walls." If that were the case, water would accumulate in the filter housing after rainfall. I've never seen that happen. Neither the Golf nor the Passat.

Regarding the VR (likely referring to a vehicle), I haven't experienced any issues with a wet filter; I even took it out specifically after a drive in the rain. He's designing it to draw air from behind the fenders, which will be a more effective way to prevent water from entering.

My Passat, on the other hand, draws air directly from between the hood and the grille, and it has problems with water getting into the engine.

The fact that you've never seen water in the lower half of the air filter housing...
'stehen sahst' likely refers to a situation where water is draining, and the phrase suggests that this is because of extra holes drilled to allow the water to flow.
There are drainage holes at the bottom, where liquid can drain out. (AFN)
These holes are located at the deepest point of the plastic casing.
which suggests that they were not made randomly.

'It's possible that these [features/parts] are not present on the air filter housing of the VR6 engine.'
because, due to the design, it is not possible to draw in any water.

Best regards.
Peter.

neubaupe wrote:

Possibly, these do not exist on the air filter housing of the VR6. because, due to the design, it is not possible to draw in any water.

No, there isn't. Therefore, this case probably doesn't require the longer nozzle.

What kind of AFN are you talking about? Earlier, I was only referring to the G3 VR6. I'm not familiar with any other enclosures.

"In my Passat (3BG, see signature), the water can actually drain away." However, that doesn't change the fact that my filter is completely wet after driving in the rain.