General Tips: Useful Advice for Everyone | Posts 16+

Hello everyone.

Even though the most significant problems seem to have been resolved, here's a general note:

The narrow section or foam should be positioned as far away from the display as possible, as this allows the volume of the tube between the narrow section and the display to have an additional calming effect.

It's like a low-pass filter in electronics: the bottleneck represents the resistor, and the volume of the tube behind it represents the capacitor.
The larger the capacitor, the better higher (oscillation) frequencies are suppressed.

Hello everyone!

I thought the advertisement from Conrad might be the reason for the shaking .

@ulf, the idea of mounting the hose clamp further away from the LDA sounds plausible. However, wouldn't the inertia increase the further away the hose clamp is placed from the LDA, due to the increasing volume between the clamp and the LDA? Or is the inertia negligible in this case?

Okay, here's the translation:

'I'm a bit concerned about the oil pressure, as I spoke with a master mechanic at a Seat dealership about it. My oil pressure remains at 0.7 bar after about 5 to 10 minutes. The mechanic's response was: 'That's normal; even at higher engine speeds, it doesn't change much, and the oil pressure stays between 0.7 and 1.2 bar.' Is it true that the oil pressure drops so much at higher temperatures, above 90°C? In a cold state, the pressure at idle is 2.5 bar, and it changes depending on the engine speed until the oil reaches operating temperature.'

Best regards,
TTL (Andreas)

TTL wrote:

@ulf The idea of mounting the hose clamp further away from the LDA sounds plausible. Wouldn't the inertia increase the further away the hose clamp is placed from the LDA, due to the increasing volume towards the LDA? Or is the inertia negligible in this case?

Hi Andreas,

Yes, the advertisement will also become more prominent.
But before this becomes a problem according to the IMO (International Maritime Organization), the vibration will disappear as soon as the ratio between the restriction and the downstream air volume is correct.

The narrower section doesn't need to be as precisely calibrated and prone to blockage as the area closer to the display.

Hello everyone!

Okay, so the narrow section in the hose leading to the LDA was adjusted to approximately 50 cm. As I narrowed it, the vibration decreased, as Ulf suggested, and the inertia also increased. Furthermore, I observed that when I reduced the engine speed from the middle range back to idle, a kind of suction effect occurred, which was very slight. Is this caused by the remaining volume in the narrow section leading to the LDA, because then the pressure flows out? Or is there a suction range in the TDI engine?

Best regards,
TTL (Andreas)

PS: By the way, thank you again for the helpful advice .

Hi,

So, the TDI doesn't have a vacuum area, but I'm not sure what could be causing that.

Greetings,
Thomas.

TTL wrote:

Furthermore, I observed that when I reduced the engine speed from the middle range back to idle, a kind of suction effect occurred, which was very slight. Is this caused by the remaining volume of air in the restricted area leading to the LDA, because then the pressure flows away? Or is there a vacuum range in the TDI engine?

Hi Andreas,

The advertisement is most likely accurate. Depending on the design of the intake manifold, a slight vacuum may occur in the intake manifold during acceleration.

The air filter and the intake manifold without a drive (i.e., in a scavenging mode) are also bottlenecks, behind which the suction motor creates a slight vacuum.

If this vacuum becomes significantly stronger at some point, the intake path will also be blocked (e.g., by leaves being sucked in, a clogged filter, etc.).

Hi Ulf,

"That is to say, if I were to hold this intake nozzle with my hand, for example, would the LDA need to be positioned slightly within the suction area?"

Greetings,
Thomas.

Thomas wrote:

That is to say, so, if I were to hold this suction nozzle, for example, with my hand, would the LDA slightly enter the suction area?

Hi Thomas,

Yes, of course - if the engine is running .

TTL wrote:

... Okay, here's the translation: "I'm a bit concerned about the oil pressure, as I spoke with a master mechanic at a Seat dealership about it. My oil pressure remains at 0.7 bar after about 5 to 10 minutes. The mechanic's response was: 'That's normal; even at higher engine speeds, it doesn't change much, and the oil pressure stays between 0.7 and 1.2 bar.' Is it true that the oil pressure drops so much at higher temperatures, above 90°C? In a cold state, the pressure at idle is 2.5 bar, and it changes depending on the engine speed until the oil reaches operating temperature." ...

Hi Andreas,

The statement from the customer service manager is NONSENSE!!!!
According to the SEAT service manual, the oil pressure must be at least 2 bar at an oil temperature of 80°C and an engine speed of 2000 RPM. At higher engine speeds, the oil pressure must not exceed 7 bar.
"Could you please ask the expert to show you the engine repair manual? It should contain information on how to check the oil pressure."

Hello Bertil!

I also think that something about the statement made by the Seat Maestro isn't quite right.

@Everyone
I'm also not sure to what extent I can still compare my old naturally aspirated diesel engine with my turbocharged diesel engine in terms of oil pressure. Even after hundreds of kilometers, the gauge still worked perfectly with a different oil pressure sensor from VDO, which I unfortunately no longer have.
I'm starting to think the oil pressure sensor might be faulty.

Here's the translation:

'One more quick question: Are there any differences between the oil pressure sensors from VDO and the ones from Conrad Electronic (EQQUS or something similar)?'

Best regards,
TTL (Andreas)