Enjoy. A lot of this was gone over in my build thread (see sig) as well, if you feel so inclined to check that out.
There is also this companion document I made going over much of the same stuff in the video, though some of the concepts are better conveyed with a mouse pointer and narration over the diagrams.
Edit 1/20: I've let this get a bit out of date, and since we've now delved a LOT deeper than originally done, I'm working on a revised document which will have a lot more information covering what has been learned in the ~5 months since this started).
For anyone who has done the retrofit and at least driven in anger for a bit, done an autocross or two, or a track day to "test" the results, please do me a favor and fill this form out so we can start to establish some trends if possible:
EDIT: So you don't have to sift through this now large thread, I've since made a website where stuff is a bit more condensed plus tons of other neat stuff - particularly if you are driving your MK7 on track or autocross.
In particular you'll want to check out these specific posts, bolded ones are longer and get a lot more in-depth with the technical challenges at hand, and discoveries along the way:
- https://www.datadrivenmqb.com/drivetrain/pcvtechtalk >>> This has a link to the video in this original post, some visuals to go with it, the part numbers needed, plus a follow-up video showing bench-testing of the originally unused Venturi in the Tiguan PCV hose to assess viability of utilizing it.
- https://www.datadrivenmqb.com/drivetrain/mk8pcvtracktest >>> This is track testing of the MK8 PCV retrofit in the "basic" configuration as originally performed. I go over findings and what showed up in the data.
- https://www.datadrivenmqb.com/drivetrain/mk8pcv-venturi >>> This is the next experimental step: Utilizing the "extra" hose to push air past the Venturi in the Tiguan PCV hose for better crankcase pressure/vacuum management.
- https://www.datadrivenmqb.com/drivetrain/mk8pcv-venturi >>> Actual track and functional testing of the PCV w/ Venturi. It's ridiculously good at keeping crankcase pressures consistent.
- https://www.datadrivenmqb.com/drivetrain/mk8-pcv-follow-up-nov2023 >>> MK8 PCV retrofit updates, plus lots of more MK7/8 PCV tech talk.
- https://www.datadrivenmqb.com/drivetrain/mk8pcvsensor >>> Why I think turbo inlet pipes might be a major contributing factor to OEM PCVs smoking on track. I added a PCV sensor to be able to monitor further.
- https://www.datadrivenmqb.com/drivetrain/venturicrankcasetesting >>> In depth look at crankcase and PCV vacuum levels.
- https://www.datadrivenmqb.com/drivetrain/just-the-tip-testing >>> CONFIRMED that turbo inlet pipes may be a massive contributor to PCV system problems (regardless of OEM or aftermarket plate systems). Plus demonstrates why MK8s just plain don't have problems on track, allowing the diaphragm style system to work without sucking up oil.
Alternatively if you just want to go straight to the videos, here is the playlist on YouTube that will get continually updated. Numbers are out of order on purpose - I changed the order so the most useful stuff is first. I really shouldn't have started labeling any of them as "part 1"... 2... 3... etc in hindsight but here we are:
If you're just here to see HOW to do the basic retrofit, I actually just made a video since I had reinstalled a MK7 valve for testing... so when re-installing the MK8 valve again it was covered here. There is LOTS of information in the description of this video. Be sure to check it out. Mentions about where the full retrofit will deviate are in the video, with a link to the full retrofit differences.