Motorprobleme beim ARL Motor (1,9er mit 150PS) | Posts 16+

@ lappen.

If the shovels are "steep", there is little charging pressure!!!

Due to high pressure, they are positioned flat, thus parallel to the exhaust gas (almost tangential to the housing circle) coming from the outside, and form a small opening towards the turbine. This results in a higher flow velocity and a higher turbine speed, which creates more boost pressure.

For further information, please refer to the book "Dieselmotor-Management" by BOSCH.

Here is the whole thing: /viewtopic.php?t=7479&highlight=steil+flach+druck#49247
Okay, ich werde den Text ausführlich erklären, bevor ich die Übersetzung liefere. Bitte gib mir den deutschen Text, den du übersetzt haben möchtest. Ich werde ihn dann Schritt für Schritt analysieren und erklären, was die einzelnen Teile bedeuten und warum ich bestimmte Übersetzungen gewählt habe.

Sobald ich den Text habe, werde ich Folgendes tun:

1. **Den Text lesen und verstehen:** Ich werde den Text sorgfältig lesen, um sicherzustellen, dass ich den Kontext, die Absicht und die Bedeutung der einzelnen Sätze und Wörter verstehe.
2. **Die einzelnen Teile analysieren:** Ich werde jeden Teil des Textes einzeln analysieren und erklären, was er bedeutet. Dabei werde ich auf folgende Aspekte achten:
* **Wortwahl:** Ich werde die spezifische Wortwahl hervorheben und erklären, warum bestimmte Wörter gewählt wurden, um eine bestimmte Bedeutung oder Wirkung zu erzielen.
* **Grammatik und Satzbau:** Ich werde die grammatikalischen Strukturen und den Satzbau erklären, um zu verstehen, wie die Sätze aufgebaut sind und wie sie zusammenhängen.
* **Kontext:** Ich werde den Kontext des Textes berücksichtigen, um sicherzustellen,

m;

UUUUUPPPSSSS!! Sorry, I didn't quite get it!

That's exactly what I meant...

That sounds logical. It would be a "small" problem if it were a leak in the intake side (as long as it's not the LLK itself), I will check it carefully. Additionally, I will also disable the AGR (using a seal). Is the VTG inspection at the ARL engine also the same? Does it have a larger turbocharger, then?

You can verify the VTG with any loader of this type with adjustable settings using a pneumatically-mechanical system according to the method described in the technical article.

That sounds logical. It would be a 'small' problem if it were a leak in the intake side (as long as it's not the LLK itself), I will check it carefully. In addition, I will also set the AGR (using a seal). Is the VTG inspection at the ARL engine also the same? Does he have a bigger turbocharger, or not?

Hello,
Now, first of all, a leak is a leak.
First, localize.
Best regards,
Günther

What else I noticed was:

The highest air mass target value of 850 mg/h seems, in my opinion, to be somewhat inconsistent with the ARL. Even with a lower boost pressure in the ASZ, the full load target value is between 900 and 1250 mg/h. Despite the loading pressure deficit, the logged current values are within the acceptable range.
Are you sure that the correct control unit with the correct calibration has been installed for the ARL?

@Roger

Hmmmmmm... this depends on the tax ID number. We've had a few PDs (presumably referring to individuals or entities) where this was the case, with dosages of 850mg/H. However, others had different amounts. I think I remember reading somewhere that this is due to the resolution of the interface.
towards the diagnostic system. Intern, the control unit is functioning correctly with the correct values.

Hello again,
The weekend is over and I've tested a few things:
Valve replacement - no improvement observed.
Vacuum system checked, hoses replaced - it's sealed.
Turbocharger removed - Visual inspection OK, no bearing play OK, no rubbing on the housing, no significant oil deposits.
Engine swap completed (due to the turbocharger upgrade)
AGR Closed Down
Intake Length Checked
Result:
No more rattling under partial load, continued strong rattling under full load, turbocharger whistling is clearly audible (especially under load)
After a short period of operation under full load - emergency mode with error:
17964 - Charge Pressure Control: Negative Deviation
P1556 - 35-10 - - - Intermittent
SHIT!!!
Okay, test drive with VAG COM:
The maximum pressure requirement is never reached under load (deviations of up to 0.3-0.4 bar!!) The values are acceptable in partial load operation, LLM Ist is within the specified range (up to 1249).
I'm really worried (turbocharger or intercooler)
I'm really at a loss. Do you have any more ideas? I'm also happy to provide the log, if a moderator allows it.

Zak1976 wrote:

Intake Length Checked Result: No more rattling under partial load, continued strong rattling under full load, turbocharger whistling clearly audible (especially under load) After a short period of operation under full load - emergency mode with error: 17964 - Charge Pressure Control: Negative Deviation . . . Loading pressure Never reaches the specified value under load (Deviations up to 0.3-0.4 bar!!)

Hi,

The underlined passages still point to a leak somewhere between the compressor and the engine.
Maybe a crack in a plastic or rubber part that only opens when there's sufficient pressure – there have been the most incredible things in the most incredible (and inaccessible!) places.

I would also specifically look in this direction + especially pay attention to any suspicious oil stains.

I really hope to find a leak...
Unfortunately, I have no idea how to check the system for leaks. What pressure does it need to withstand? Would 1.5 bar be sufficient? How can I make the pipes or the LLK airtight enough to test? I haven't found any oil leaks. How could I check if the turbocharger is still reaching the specified pressure? I have many questions, but maybe you have some ideas too. I would be grateful for any help.
Greetings

Zak1976 wrote:

I really hope to find a leak... Unfortunately, I don't know how to check the system for leaks.

Loosen the hose at the compressor outlet and somehow securely close it to maintain pressure.
Detach the pipe at the GRA unit and also seal it, but insert a bicycle valve or similar into the seal and then inflate everything.

Quote:

How much pressure does it need to withstand? Are 1.5 bar sufficient?

If the pressure shortage is caused by a leak, it must already be significantly below 1.5 bar

Quote:

How could I check if the turbo is still reaching the required pressure?

By ensuring a guaranteed dense charging air path and then logging it again. :twisted:Or, integrate a (more reliable, as simpler) LDA right away.

P.S.:
You won't find a Golf 3 that's been converted into an ARL on every corner.
If you have a clear and understandable documentation on the associated problems and solutions, then IMO would be of interest to many people here.

Hello,
If you hear a loud hissing sound while driving, then you should be able to pinpoint the source of the hissing by pressing the accelerator while the car is stationary!
Best regards,
Günther

@Ulf:
thanks, I'll try. There must be something to find. Yes, I'm also proud of the conversion, it's a lot of fun (when it runs). I don't have a documentation in the sense, but I could create one and publish it here. It was definitely a lot of work, especially because VW is so helpful, and it was very difficult to get certain documentation, especially technically (aside from the electrical system), it was less difficult than expected, the engine and the 6-speed gearbox fit (the engine mount was still changed, because the oil pan would otherwise be dangerously close to the ground...), but the result is worth it, it's very interesting to see the expressions of 330D drivers when they are overtaken by a Golf TDI...

@Gustav:
The engine is very loud when the hood is open (and someone else is pressing the accelerator), making it almost impossible to pinpoint the source of the noise. I find Ulf's approach very good, perhaps there are other possibilities as well (e.g., lubricating with soapy water, using a starter spray...), as I said, any tip is welcome.

Zak1976 wrote:

The engine is very loud when the hood is open (and someone else is pressing the accelerator), you can hear a lot of noise, and it's almost impossible to pinpoint the source.

Hm, have you ever (of course, with a warm engine!) given it full throttle up to around 4500 rpm?

During the AU test, the boost pressure actually spikes briefly approximately up to the full load value in the high rpm range. IMO, the sound of the escaping air should also be detectable even when the hood is open (or even closed).

When applying "gentle" pressure, the pressure hardly exceeds 0.2 bar, and at this level, you can't usually hear the leaks -> LDA rulez

By the way, I've moved the IMO topic to a more professional area.