Adjust VTG Rods: How-To Guide

Hello everyone.

I finally managed to get my VTG vacuum sensor replaced.
Now the turbo is whistling again, and the car is producing good power in the lower gears.
It seems like he's building up too much pressure in the 4th and 5th gears, and then it switches to emergency mode at 110.

Unfortunately, my acquaintance's (who made the exchange) laptop is broken.
He adjusted the length of the VTG rod exactly as he had with the old one.
The attitude doesn't seem to be right.

Now, I had visited several VAG dealerships in the Schwerin area.
Only a master could truly address my problem.
Otherwise, I would only hear that the VTG rod cannot be adjusted.
One of them was even quite rude.

Does anyone know of a VAG car dealership in Hamburg that is capable of handling such issues?
Does anyone of you live in Hamburg or the surrounding area and could possibly carry out the installation?


Hopefully, you can help me again.

Regards... JL

Did you receive the same size can, or a different size?

What happened to the old can? Was it leaking / did the membrane tear?

How did the defect manifest itself before you replaced the part?

The adjustment is likely only possible via a diagnostic adapter. You need to determine whether you have overboost or underboost.

Hello Holger,

According to Schlütter, I received a can of the same size back.

Before the modification, I also experienced a recurring emergency mode at 120 km/h.
My acquaintance, as a test, replaced the solenoid valve and the mass airflow sensor.
Brachte beides keine Besserung. Dann die VTG geprüft. It was easy to use.
Alle Schläuche gecheckt. Everything is okay.
Then I tested the vacuum sensor, and it was severely corroded.
He had temporarily cleared the blockage by pumping a few hundred times, but the effect only lasted for about 2-3 weeks.

Now, I just need to find someone who can finish setting up the equipment.
Apparently, at VW, customers feel like they're being immediately reprimanded if they try to help themselves .

JL

What causes the emergency mode?

Excessive boost pressure.
too low.
Or maybe something completely different???

log, log, log

m;

Hello JL,

If you want to make the boost pressure build-up softer (i.e., reduce the overshoot), you need to extend the rod. (Slower response, lower maximum pressure).

Shortening the rods has the opposite effect.

However, based solely on your information, I'm not entirely sure if that's the cause. But if you don't have a way to read the data and you suspect this might be the issue, it might be worth trying (Measure and record the current length beforehand!).

Do you think that, compared to the standard settings (without limp mode), the turbocharger now has too high boost pressure (i.e., too much 'power,' excessive overboost), or rather too low boost pressure (slower build-up, resulting in less power)?

Regards,
Private.

Hello and thank you all for your participation.

Okay, I suspect it's due to excessive boost pressure. However, I don't have a way to measure the data.
However, my car accelerates quite well in the lower gears after replacing the canister. And it responds very quickly to the accelerator pedal.

I only have the possibility to compare it to the previous performance (in case of a defective container).
It only started producing pressure at around 2500 RPM.
There is already pressure at approximately 1500 RPM.

Unfortunately, I'm not a mechanic or anything like that, and I don't have the opportunity to quickly analyze the data.

That's why I would also have it reproduced by VW.
But they're just standing in the way.

JL

So, this initial setup work should be something that any Volkswagen workshop can handle. However, if you've had bad experiences with everyone, then I can only recommend the following:
1) continue searching for a qualified car dealership.
Ask the person who installed the can to temporarily extend the rod, just in case.
3) to extend the rod itself.
4) To provide you with a diagnostic tool so you can measure and adjust settings yourself (adjustments may be done by someone you know).

Which option I would prefer is the fourth one! It's not as expensive or complicated as it sounds! Here, at the diesel mechanic shop, they have the kit for it for €62 and the finished adapter for €99 (see here).

You will also need the VAG-COM software (the free shareware version is sufficient for your purposes!) and a laptop (perhaps borrowed?) with a serial port (or a suitable USB-to-serial adapter).

I believe that the €62 or €99 are well spent because you can reuse the adapter multiple times, and you don't always have to go to the workshop and blindly rely on their information.

If you don't like option four, I would suggest trying options 2 or 3; you can't really mess anything up by trying them!

Regards,
Private.

Don't dwell on it for too long. Based on your description, it sounds like you're experiencing excessively high pressure. You can't really break anything by adjusting the VTG (Variable Turbine Geometry) towards lower pressure, unless you damage the component by forcing it.

Turn it one more notch, and if it's trending in a better direction, keep adjusting it in half-notch increments until it's right.
A pressure gauge would also be helpful; a manometer costs very little, around 10 euros, and just requires a bit of tubing.

Don't give up! / Be brave! / Keep going!

What's the best way to approach this?

How is the rod attached to the can?

Regards,

Manuel.

jl_0815 wrote:

Hello everyone. Does anyone know of a VAG car dealership in Hamburg that is capable of handling such issues? Does anyone of you live in Hamburg or the surrounding area and could possibly carry out the installation? Hopefully, you can help me again. Gruss...... JL

The rod is adjusted as follows...
Ideally, you'll need a vacuum pump with a pressure gauge for this.
The rod must begin to move within a pressure range of 50 to 120 mbar.
And it must operate within a pressure range of 600 to 650 mbar.
You can have it done at a Bosch service center or an Audi workshop!

I also had to do it just yesterday because the factory had forgotten to properly tighten the lock nut on the adjustment rod. The car had no power after 550 km .