JamesVaughn3rd

iTrader: (3)

Hey All,

My project has gone on such a long time I have had time to do tremendous amount of research about wiring harnesses and vacuum hoses. Someone on the board was looking for something so I am finally going to post it.
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So I’ve spent a very long time dismantling my car and in the process putting in a single turbo, new fuel, Apexi PFC, new aero, the whole shebang. During this process I learned a tremendous amount about the 'ol Rx and still have much to learn. Anyway, I probably ran roughly 30 searches on different ways to hook up vacuum lines and electrical lines when either simplifying for running in sequential or converting the car to a single turbo. During all of my research I was never able to find a great thread that included everything I needed, so I decided to help those who will have problems in the future switching to single turbo but gathering that info into one thread.

I encourage everyone who reads this to go ahead and review what I’ve put and please feel free to add debate on how you run your lines and if you agree or disagree. If there is anything that I did wrong (which is very possible) please correct me. Unfortunately this site won’t let me edit after a period of time, but maybe the moderators can if they see it fit.

Here goes:

Assumptions for both diagrams:
- Single Turbo Setup
- All new Fuel system w/ injectors and rails
- Aftermarket ECU


TL Note 1
This setup still includes the Gas Fumes Purge Control system. This is not necessary for a running car. Some have plugged it, which can cause negative side effects, however some do this without issue. Some do not use the check valve which I have heard that it can create a “pop” or mini-explosion in your manifold when starting your car. Unsure if that actually damages anything.

Pros and Cons to leaving hooked up.
Pros – You are conforming with the law.
Cons – Smells like Gas, quicker fuel loss due to loss of vapors, it is illegal to vent to the air.

Consensus – Leave hooked up.

TL Note 2
This diagram uses a catch can. At times, oil can come up the oil cap, which needs somewhere to go. The stock setup puts the oil into the manifold which cycles through the combustion. Many eliminate that setup in favor of using a catch can. This has a hookup to will empty that oil into a catch can which can then be emptied manually. If this can becomes full, another hose is utilized to empty the overflow back into the oil pan using the now useless second oil drain port.

Pros and Cons of using a catch can
Pros – No oil running through your intake unchecked.
Cons – One more thing to buy and find room for, then make custom fittings for.

Consensus – Either look up the stock system and leave it that way, or buy a catch can. Catch can seems to be the more “professional” way to do it.

TL Note 3
This is the OMP Nozzles that shoot oil into the motor to keep everything lubed up. Some vent these to the atmosphere, and report no issues. Some have capped them with no issues. FDs have them plugged in Pre-turbo. The T2’s were after turbo but before Throttle body. I personally have them both routed to one of the tubes on the LIM, then a small filter on the other side of the LIM tube, giving it simply filter air.

See the below thread for some lovely discussion on what they do and where they think you can and cannot put them.
https://www.rx7club.com/showthread.p...vacuum+diagram

Pros and Cons to leaving hooked up
Pros – Its intention is to help lubricate the motor, which in turn helps the car from exploding.
Cons – One more hose to hook up, otherwise none.

Consensus – You should not plug them. Other than that, it’s all fair game. Just make sure vented air goes in there somehow other than post Throttle body.

TL Note 4
This is the Fuel Atomization line. I heard of people capping this. Admittedly I don’t have extensive knowledge of this tube, but as its intent is to help improve fuel atomization, I see no reason to eliminate it unless you really really hate vacuum lines.

Pros and Cons to leaving hooked up
Pros – Helps Fuel Atomization
Cons – Is there anything good about NOT hooking it up?

Consensus – Leave hooked up.

mid_life

iTrader: (9)

Thanks for that, looks like it should help alot when I start putting this thing together.

JamesVaughn3rd

iTrader: (3)

I have one for a simplified wiring harness too I'll put that up sometime, if you see my notes I referred to it but cut it out for this post.