I'm confused on what you're asking. If you're going to copy my setup, I already have the pics with the description posted (which you found). Use Y as the return and leave X alone. Are you trying to use X as your feed instead of what you illustrated in pic 3?

 

I meant X was the feed to the TB and Y was the return from the TB. X is the same line coming from pic 3 (apologize for the confusion).

For turbo water cooling, I would use the line coming out of pic 3 as the feed line to the turbo and the line in pic 4 as the return line from the turbo. This would bypass the TB altogether.

 

This is the way to do it.