Frage zu Turbolader KKK am AEl | Posts 16+

In my opinion, there is an error in the technical article. Pressure applied to the can on the wastegate does not open the wastegate; rather, it should keep it closed, meaning it should not move under normal circumstances when pressure is applied. Can you check this?
Edit: There might be differences between 1Z/AHU and AAT/AEL in this case, and the information provided for AAT/AEL is definitely incorrect.

Okay, I understand it that way too. I wasn't aware that it opens automatically.
I will check that.

To be honest, I have to say that I've had a faulty oil separator more than once - so, while you might notice if the pressure from the turbocharger side is missing, it's not always that obvious.

I'm testing that right now.

Overall, based on my observations, I believe that if there were a lack of boost pressure, it should produce a significant amount of soot. However, it's not doing so. Instead, it's more likely that he's simply injecting too little fuel – so, quite simply, not enough is being injected. The pump is the next likely culprit...

THX.

According to SSP153 from the industrial engine manufacturer, when the N75 valve is de-energized (unplugged), atmospheric pressure is applied to the wastegate actuator. Unfortunately, it doesn't state whether the boost pressure will become too high during driving or whether it will remain below 0.6 bar.

Could you please let me know if your wastegate opens or closes when pressure is applied to the diaphragm, and what its resting state is? So, does the wastegate in the turbocharger open or close without any pressure?

Best regards, Rainer.

HELLO

I would be happy to test that. I'm interested in that too.

Regarding the issue - I was just driving without the exhaust, and the engine is pulling strongly. I'm going to replace the exhaust now - I think that's the problem...

I'll get back to you later!

Best regards,

Please don't forget to perform the boost pressure test drive with the hose disconnected from the wastegate valve.

I will definitely do that; I hope I'll have three working ones right away .

I'm not sure if it's still happening today.

Very interesting. So, I drove it without the exhaust pipe, and it ran. Full of energy, I returned home, reattached the exhaust pipe, and drove to the workshop to get it on the lift. I put the catalytic converter and exhaust pipe in the trunk, and... what can I say, it now works perfectly fine with THAT exhaust pipe as well.
So, I've decided not to go through with the exchange. Instead, I had the vehicle inspected (TÜV) and the wheel alignment checked, and everything is perfect. Thank you for the information.

I've now done a test run, and it turns out that the wastegate opens on its own at around 0.6 bar. So, if I disconnect the connector, the boost pressure remains at 0.6 bar, but it's stable. I experienced a significant pressure drop at 3000 RPM, but that wasn't happening with the wastegate open.
According to this, pressure is needed to push the wastegate, and this pressure is regulated via the gold-colored canister on the mass airflow sensor (MAF). The pressure is coming from the intake piping, specifically from the intercooler section where the oil separator is located. If the oil separator is broken or burst, the wastegate will not receive enough back pressure and will remain open.

I also took a test drive and documented it – see the attachment.


Thank you all for your help - I'm a little smarter now!

Quote:

.. what can I say, it now works perfectly fine even with THAT exhaust.

Self-healing - or is something loose inside, which by chance isn't blocking the passage? Wait

It was as if something was stuck - after a quick "clearance," it then worked.

Okay, if that happens again, I'll replace the catalytic converter. A used one won't get any worse. Or, I need to take a closer look and maybe come up with a completely different approach – that would probably work best.

Hello,

Thank you for your feedback! This also aligns with my own experiences and the description of the wastegate pressure control system in the VW industrial engine.

Best regards, Rainer.