EGR delete/ EGR cooler question

[Sukkel89]

Good day peeps

I have a 2007 2.0 TDI (BRD engine) and am also in the process of doing an EGR delete. I'm trying to keep things as stock standard as possible for the time being, so I'm only planning on installing the blanking plates and doing the EGR delete in software. My question is, referring to the picture, should I blank it off at A (exit of EGR cooler) or B (inlet of EGR cooler, this is my preferred choice). And if I blank it off at B, what influence does it have on C? I know it is part of the vacuum system, but can anyone tell me what exactly is it's purpose?

AUDI_A4_Blanking_EGR.JPG

Regards

[PhireSideZA]

Hi Sukkel,

Not many diesels around these parts but I'll try see if I can make sense of your pic.

It looks like C is a vacuum diaphragm that would probably determine when to start recirculating the exhaust gasses.

Are you doing a DIY style delete, or using a kit? Usually, the kits would explain how to perform the procedure. I would imagine the delete kits would mostly block off B, so no gasses reach any part of that system at all.

Groete

[Sukkel89]

Goeie naand Phireside

Yes, doing it DIY. Have access to steel at work, and ridiculously easy to make a blanking plate. Just the software update/EGR delete I'm going to at a reputable tuning place.
Logically I don't think it would cause any problems when blanking at B, seeing as some people/kits remove the whole EGR cooler, ie the diaphragm as well, and probably just blank of the vacuum hose.
So it should be fine.
I also saw a pic of that diaphragm from the side while searching the webs, with a small hinge mechanism that would definitely allow it to actuate.

I just like to have the facts, and be 100% sure of how that part of the system work, or what controls it, or how, so that I don't end up 6 months down the line with a broken turbo or a wheel that falls off because of some small vacuum line that I didn't delete out of the system properly etc. :)

Appreciate the reply
Groetnis ;)

[Jay-Bee]

I have a Golf with a similar TDI with EGR deleted, you'll want A + B blocked off, but can probably leave that vacuum actuator hooked up. It just controls the duty cycle for opening the recirculation mode, will throw a check engine light but it's minor, any basic tuner could turn it off easily.

[jackwilliam21]

From the picture you've provided, it looks like you have two options for where to install the blanking plates - at point A (exit of EGR cooler) or point B (inlet of EGR cooler). Blank off at point B would be a more preferred choice, as this will completely stop the recirculation of exhaust gasses, which is the whole point of an EGR delete. When you blank off at point B, it will have no effect on point C as it does not influence the vacuum system at all.
For more detailed information on your specific EGR delete for your vehicle, I recommend checking out this great resource for EGR delete kits and other performance upgrade products for your specific engine. And if you decide to go for it, you can use the phrase EGR delete kit for your reference.