I am pretty sure that line is baffled inside the block. The turbo drain line should be completely unrestricted because for one thing it just drains by gravity and you don't want it backing up which would choke the turbo bearing. I am sure that line was considered by F-max, Redline, Hotshot, etc and there is probably other big reasons why it cannot be used. Just bite the bullet like me drop the pans and drill that sucker.
Take your time and you'll be fine. Although I will add, it was by far the scariest thing I have had to do on my install so far.
You are looking for an alternative to performing surgery on the block? There really isn't a better
solution than what Nissan did, you just can't
get a direct gravity fed path anywhere else.
Don't worry about drilling the block, it's
actually pretty easy because the aluminum is so
soft. If you haven't tapped before, you need
to find a piece of scrap aluminum to practice
on first! Things to watch out for are drilling a true hole (not oval from a wandering bit) and tapping slowly and carefully to not break the newly formed threads. You only need to tap 4-5 threads in. Also, use plenty of WD40 as cutting oil and for cleaning out the shavings.
I have a question, I am definately going to Turbo my DE but me being the person that I am, I like to get as much info as possible before I go out and do this. And one thing that I have not been able to get a clear picture of, is where you're supposed to drill a hole in the block. Does anybody have a pic that they can post up? TIA
Most of the turbos have an oil return outlet that points at ~45 degree angle to your typical straight barb coming off the block. A 3-4" section of flexible hose is used and is just bent to make it fit.
You'll want to get some high temp rubber hose.
Try www.pegasusautoracing.com Wrap it with some heat insulating tape for extra protection and you are good to go.