Anthony raises a lot of great questions and points. He's clearly done this before, and is a guy who ought to be listened to. This is stuff I obsessed over for a very long time. The way I did it is not the only way to do it, by any means. I would suggest anybody contemplating doing this read a lot, and talk to people who have done it.
I'll explain how I did it in red, inserted into Anthony's text:
when setting up the dry sump system there are some things to be addressed.
Oil tank, size, location, fitting location, are you going to have a custom one built and fitted to the car? Or use a off the shelf design. I made my own tank. It is possible to use a 911 oil tank, but I wanted the tank to fit perfectly into the space I had for it, and I did not want the filter where Porsche put it (I am using my JayCee filter base for the Accusump input, as well as my over-pressure bypass). Tank design is really really critical. You want to reduce foaming, and always keep the pick-up under the level of any oil with bubbles in it. The design of the reservoir is critical in this regard. I looked long and hard at all options before I built mine.
Routing oil lines, AN fittings and hose-which type? Push on, or crimped or reusable? I used AN fittings, reusable. I did not use silicone hoses, but I should have.
what brand or design oil pump. One scavenge port or two. Bugpack. One scavenge port. More gets pretty long.
Oil pump clearance in relation to your header? Anthony has clearly done this before. The header clearance is where this project gets expensive. I had Tiger from A1 make not one, but two custom headers to clear the pump. I wanted at least 1" of clearance, but sometimes you get what you get. The first was a modified A1 "low-down" (what is in the link I put up above), the second (what I'm running now) was a modified sidewinder. Expect to have to talk Tiger into making this, and doing a bit of modification on it once it comes. Really, nobody wants to talk about dry-sumping, unless you are running a 400 hp 3L turbo on a Pauter case.
Are you using the stock pickup in the case or autocraft pickup from the bottom of case. I'm using a stock pick-up. The Auto-Craft pick-up is better, but hangs lower. I'm happy with what I've got, but I still wonder about it sometimes when I'm nodding off the sleep. As an aside, I'm telling you gentlemen: Anthony REALLY knows what he's talking about.
Are you going to scavenge at the valve covers also? I didn't. This is overkill (IMHO) for a street motor that gets shifted at 6500 RPM. It makes the pump REALLY long, and makes header clearance almost impossible (unless you are OK with the collector being 6" behind the car) if you do it.
include a shut off valve if tank is mounted higher than oil pump? I did not, and it has not proven to be a problem. It is a problem for some people. I worked pretty hard to hold the tank low, but it's almost always going to be higher than the sump. If it isn't, there's very little advantage to doing it. I probably get some drain-back, but I pre-lube with the Accusump and have never had a problem with over-filling the sump. Design of the oil tank is pretty critical here.
i suggest all your scavenge lines be AN 10 or AN 12. Perruse line can be AN8. I used 8 AN lines everywhere. I know I was supposed to use 10s or 12s for the scavenge lines, but this has worked fine for me for 15K mi or so. Again the modest red-line of a street engine means that some of the rules of thumb can be ignored to some extent. Everybody agrees that the pressure side is fine with 8 AN.
put a filter on the scavenge side and on the pressure side before the cooler. This is the main place where I parted company with the "conventional wisdom", and the only place I might disagree with Anthony. I didn't do this either, but this one I didn't do for what I think are very good reasons. For why, see below:
Best set up is a scat filter mount with a bypass built in the housing. I really like the JayCee filter base, also with the built in pressure bypass. This is why I put the filter on the pressure side of the system. All of my pressure control hardware is done at the filter base. I bypass back to the sump if the pressure rises above 80 psi (I'm going to lower that to 60 psi someday soon) on the pressure side of the pump (what the galleys and oil cooler seals see). I dump the Accusump into the filter base (which remember is on the pressure side) so that if my oil pressure drops below 20 psi, it'll feed directly into the galley. I can do none of this if the filter is on the scavenge side of the system, as I want to relieve pressure at the highest point (on the pressure side of the pump), and I want to keep that side pressurized with the Accusump in the event of a loss of pressure (or on start-up).
Also keep in mind, with all that additional oil capacity the oil will take longer to warm up. Amen, brother. In cold weather, it takes a looooong time to heat up 9 qts of Brad Penn.
This is a cool project. For me, love means never having to worry about exposing your oil pickup to foam. Oil in the galleys all the time (no matter what) is the main reason to do this. Doing that without resorting to an oil pan 2" off the deck is the only way to get low, and still be able to actually DRIVE the car.