From what I can tell, based on it's orientation as installed in the car and my research.

The bottom connection goes to the wastegastes, the connection closest to the front of the car on the side goes to the YPipe, and the connection closet to the rear of the car on the side goes to the FPipe (near the diverters).

Is the connection (closest to the front of the car) connected to the YPipe where boost (charge pressure) enters the N75 valve ? If a certain pressure is reached the N75 bleeds boost to the connection on the bottom which leads to the wastegates. If the boost threshold is not met, it passes the boost through the connection on the side closest to the rear, so basically the boost is put back in the loop via the FPipe connection ?

Or is the above backwards ?, boost comes into the N75 from the FPipe, and if boost does not reach a certain pressure, it is released back into the system via the YPipe connection, as both connections on the sides (YPipe/FPipe) technically are under pressure and essentially should read the same boost pressure ? If max boost is read, it would of course bleed to wastegates from the bottom connection.

Trying to learn, so go easy on me.


Thanks.

 

Did you look here? https://www.6speedonline.com/forums/...rging-fix.html

 

Yes, there is a link to an Audi B5S4 N75 valve and how it works, wanted to get clarification on the Porsche N75 connections and related routing.