[rocketeer928]

I have a 2003 VW Jetta TDI with the Unitronic Stage 2 chip software, DG race pipe and EGR delete. Soon I plan to upgrade my clutch using a single mass flywheel and PP520 nozzles. I'm convinced from the TDI Club TDIFAQ that I should have a turbo boost gauge, which I ordered today, and that I must adjust the VNT linkage on the turbo to lower the boost pressure.

The TDIFAQ also states that the VNT linkage is located above the diaphragm housing on the turbo. So where exactly is that on the turbo?

I've tried searching for a picture, but was unsuccessful, and my Bentley manual was really no help. Does anyone have a picture of the VNT linkage that needs to be adjusted or a step-by-step procedure?

Any help would be great!

 

[rocketeer928]

Thanks for the advice. I have the VCDS (formally VAG-COM), so I'll check into this first. And, today I ordered a turbo boost gauge.

 

[rocketeer928]

Many good responses to same thread on TDI Club forum.

 

[rocketeer928]

Last night I fired up my Ross-Tech VCDS to check the turbo boost, and I used the instructions provided by R-T. Basically, in 4th gear on the highway I gave my Jetta TDI full throttle from around 1500 rpm to 3500 rpm. Below are three of my five runs. Run 2 occurred on a decline and Runs 3 & 4 occurred on a slight incline (fairly level). According to the R-T instructions, I should see a spike at 2100 mbar that is then quickly regulated at 1900 mbar through the whole rpm range. Of course, I don't see that.

So how do I interpret my data? Does it indicate that I definitely need to adjust my turbo's VNT linkage out? Is there something else about my turbo that I should be concerned about? Since my experience with my TDI is only 6 months, I wouldn't mind a little feedback.