Help with the conversion to a large loading pressure cylinder

Hello,

I have a 1998 Golf 4 with 81kW TDI (AHF) with a Garrett turbocharger and a small pressure regulator. I'm not sure if the VTG (wastegate) adjustment is actually working.

However, if I accelerate in a high gear, then suddenly take my foot off the gas, and then a short time later press the pedal again, it sometimes takes a very long time before I feel the power return. Sometimes it works immediately again.

Unfortunately, I'm not an experienced mechanic, and I'm not comfortable working on these parts myself. Is there anyone in the Osnabrück area who could help me with the upgrade to the larger turbocharger (of course, not for free)? Or does anyone know someone...

Stefan

[Translating...]Hi,

kleine Ladedruckdose beim Golf 4 110 PS... bist Du sicher? Ich dachte bisher immer die wären nur noch im Golf 3 klein gewesen.

das ist nicht so ganz einfach, denn dort kommt man ganz bescheiden ran. Anschliessend müssen Einstellungsarbeiten mittels LDA gemacht werden.

Kannste die nicht irgendwie reinigen oder per Hand die VTG Verstellung versuchen in Gang zu bringen? Wir hatten das auch mal bei einem 3er Golf. Da haben wir dann immer mit einem Draht gezogen und Gas und Gas weg und.....

arne

Hi

With VAGCOM, it is possible (with the engine idling) to control the turbocharger valve via actuator diagnosis, which then moves the VTG from one end to the other.
However, the residual vacuum is only sufficient for a few full strokes.

Unfortunately, when the engine is running, the overboost protection (at least in the AFN) comes into effect before the turbocharger valve, and when testing this, the engine naturally stalls.
Cleverly done. "... especially since the starter motor only receives power when the ignition is switched off and then on - meaning that you can drain the battery before this, but it won't start.

And after turning the ignition off, the diagnostic system starts from scratch, so starter motor to fuel pressure valve --> see above.

Whether you could bypass the software by directly connecting the starter motor to the battery, I don't know... if so, it would be a relatively convenient method to reset the VTG and hope for improvement for a few days or weeks.

In the medium and long term, however, I believe that the large canister is the only true solution."