Nice Job man looks great and I had a feeling that you were going to have to fab something up. It just diddnt look like an easy fit with that factory tab. And yeah I won that thing at a Subaru Car show so I'm glad you are happy about the deal.

 

Thanks.

I knew I'd have to get creative too. I guess if someone really wanted a simple install they could go with something like an Injen intake which should give them room behind the TB to mount the FMIC Oil Sep. After all the work I did to my airbox though I wanted to keep it.

Hey I didn't know you won it....well at least you have luck. Cool! I guess we both made out.

 

Wow, nice work! And daammmnnn your engine and bay are extremely clean. It looks like I could eat off any surface I wanted :lol:
:drool:

 

Thanks Super, well this is the first new car I've ever owned.... sooo let's just say I'm fussy...

I've never let the car get dirty LOL. Plus the garage helps...


Tnice thanks for the compliment. I'm really happy with the way it turned out too.

The best part is I've been driving all crazy the last few days...taking turns at high rpm to see how it's working.

I pulled the top port hose today and not even a hint of oil. I was happy about that. The car is idling lower and better too. My guess is because one obviously the oil is not getting sucked into the engine intake, and two is I think because the intake manifold doesn't have to pull vacuum through the block anymore like it did with the OE configuration. This is a great albeit expensive mod, but it's nice not not to keep having to add oil.

A couple years back a friend of mine blew his engine in his 2000 RS during an autocross due to a low oil level. I wouldn't be surprised if blow-by was the culprit. Bill at Crawford told me that if I autocrossed with the higher redline from an SRS30 reflash I'd have to check oil levels after every run to be safe if I stuck with the OE PCV system or even a catch can. His advice is actually what prompted this install in preparation for cams and a reflash.

 

super clean job! looks professional IMO.

nice work

 

oh man im doing this..

 

is your airbox covered in aluminum foil?

 

Yea it's aluminum tape I picked up from Lowe's.

The black plastic soaks up radiant heat like a sponge. The foil cuts it down.

 

So if I install one of these, will my spark plug wires get upgraded too? lol. Very nice work though. I've been thinking about installing one of these starting with replacing the pcv since mine looks like it's leaking due to bad hose fitment.

 

So if I install one of these, will my spark plug wires get upgraded too?

Do you believe in magic?...

LOL...yea they're Kingsborne wires. Good stuff. They have different colors and wire diameters.



Yea now that I have put some real miles on the car since installing the oil separator I've noticed oil consumption has lessened significantly.

 

Can you explain exactly what is connected to where?

I've been looking at buying the IxizConcept separator due to how much blow by I've been having. However, all of these A/O seps are expecting a turbo configuration and I haven't been able to figure out how to plumb one to an engine that only ever sees vacuum.

 

You know this is actually a good question. I don't know why I didn't post what went where considering I had a hell of a time figuring it out for myself as the only instructions available were for FI applications.

Here ya go...

I know the pics are a bit rough. I do better with metal than paper or in this case photoshop.

Port 1 goes to fresh air.
I hooked it into my airbox where one of the valve cover hoses were originally installed. I suppose it could be run to it's own independent air filter instead to completely isolate it from the intake tract.

Port 2 goes to both valve covers so you need a "tee" fitting too make that work.
In stock configuration the manifold sucks air from the PCV valve. The valve covers are actually inlets for filtered air coming from the airbox. The air goes in at the valve covers then exits at the PCV valve. The way I understand it Port 2 is simply filtered air going into the block via the valve covers so it can circulate through to the "F" assembly.

Port 3 goes to the top of the "F" assembly. This is where the oil vapor/air coming from the engine block enters into the seperator.

Port 4 goes to the bottom port of the "F" assembly. This is where the coalesced oil drains back into the block.

 

Got a question. I looked on ebay, and all i see is a 3.5 elbow like yours. i wonder if it will fit. I shall measure tomorrow.

 

I'm assuming your talking about the 3" elbow going into the airbox....

if so the thread covering the airbox mod is here...

http://www.rs25.com/forums/showthread.php?t=84807

 

very nice work, wish i was this meticulous with my fabrication!

 

I feel ashamed to look at my engine bay

 

Jake thanks


Station why?

 

Hmm... I'm getting about the same amount of oil loss (qt/1000) as you under roughly the same driving conditions. I have a air-compressor-type a/o sep/catch in the PCV system right now. It only is willing to fill the can about 1/4". I suspect that, after that depth, it simply sucks the separated oil back out again. When driving hard, it'll make that 1/4" in about 100mi. I wonder if simply moving the outflow from my system to just before the throttle body, rather than the intake manifold, would slow oil consumption until I can afford a proper A/O sep like the Crawford or Ixiz?

Stupid a/o seps are waaaay too expensive

 

Yea A/O seps are really expensive.

Maybe one will turn up if you keep an eye out...that's what I did.

I had a catch can before. It was useless. It was empty and I was still using oil so I know what you mean.

You could try capping the line going back into the manifold and putting a small air filter on your separator instead. I've seen people do this with vented catch cans. They run the PCV hose to the can and cap the other side. That's what this guy did...

http://www.rs25.com/forums/showpost.php?p=1622969&postcount=536

I have a feeling your sep will fill up fast if you do this though. I wanted the A/O sep because I knew otherwise I'd be emptying a can all the time.

 

I have a feeling your sep will fill up fast if you do this though. I wanted the A/O sep because I knew otherwise I'd be emptying a can all the time.

Exactly. We just took a week trip in the mountains of Western North Carolina. Literally every single time I got out of the car I had to pop the hood and dump the can and it was STILL consuming oil.

Of course, I was driving so hard I burnt 1/2 the tread depth off a set of Potenza RE-01Rs in a week... :devil::burnout:

 

this thread is great, thanks very much for contributing/sharing this knowledge


....as he begins his search for a $175 used AOS

 

glad to help

 

where the F has this thread been? def subscribed.

 

thanks being such a contribution. now it is finally explained, and i too plan to go with a srs30 refllash... what kind of regrind do u have?

 

Ahh yes the reflash....

Well plans have changed on the SRS-30 reflash for a couple reasons. The main reason is I-speed is no longer doing reflashes on 2004's. In fact EM on an '04 is a huge PITA. The only options I have now are PP6 or a Hydra EMS. I'm not crazy about either really. Piggybacks have never given me that 'warm and fuzzy' and the Hydra is too damn expensive for cams-intake-exhaust.

The cams are a different story. EM aside, if I get them done I go from STX to SM. Now I've finally got the car sorted so that's it's actually quick in STX (locally) so cams on the back burner for now as well.

I'm still very happy I got the A/O sep though. It's so nice running a two-day back-to-back autocross with a co-driver and not having the oil level in the engine drop.

IMO best reliability/lifeline mod you can do.

They weren't available when I did my car, but now if I had to do it over again I would not over look the Grimmspeed A/O sep too. It's a slick design and a lot easier to install then my sep was.

 

I saw the Grimmspeed A/O butttt... As we "want" is fresh air instead of vapors of the oil, i just don't see how that is a great setup unless its not sucking from the crankcase/oil filler tube. I didnt research it much but just saw the design on it. Just found a crawford used for 1000miles for $200 from a local guy.

 

I hear ya, but its doesn't suck air from the oil filler tube. That's where it drains oil back into the block. The vent line goes to the airbox on an N/A application. You could completely isolate it as well by taking the vent line and giving it a dedicated breather I suppose.

Either Crawford of Grimmspeed you should be good2go. Just another option is all.

 

Will def have to look into the plug gasket issue but the A/O seems like the issue to be dealt with first on the agenda. My Suby tech said the oiled boot issue will hold.... for now

Just wanted to ask about "Port 2" on the A/O. This piece in particular:
"Port 2 goes to both valve covers so you need a "tee" fitting too make that work.... The valve covers are actually inlets for filtered air coming from the airbox. The air goes in at the valve covers then exits at the PCV valve. The way I understand it Port 2 is simply filtered air going into the block via the valve covers so it can circulate through to the "F" assembly."

This is also setup standard on the '02 RS, ya? I'm a bit lost on that piece and that coupled with you having an '04 RS, just thought I should ask. If I have it right, what port 2 is doing is filtering the released air/oil vapor coming from the block that stems from air trickling through the valves and then into the block?

And can you by any chance post a pic of where Port 1 installs into the airbox? "Where one of the valve cover hoses were originally installed."

Only other thing is where can I pick up those fine looking brass fittings?

 

Um you know what. I just realized I haven't undated this thread in a while.
I've actually changed things quite a bit. For one thing the "F" assembly is gone and in it's place I put the PCV valve back in. On top of that the oil drain return out of the A/O sep is now tee'd off the valve cover hose on the right bank. I also had to add a second PCV valve to turn the drain into a one-way system so oil doesn't push up through the valve cover port and into the A/O sep during hard cornering. I also added a second filter off another tee to prevent a vacuum into the airbox at heavy throttle. uggh LOL.

This set-up is a work in progress. The point was to keep the oil in the engine, but allow the vapors to run through the intake so they don't stink up the engine bay then get sucked into my vents and stink up the cabin. It works now better than it ever has and I need to post pics, but I can't at the moment. When I can I will probably redo a lot of the first post so it only shows what I have now which is like the 5th or 6th version.

Once I can reload Vista on my laptop I can use Photoshop again and I will update everything, but it may take a few weeks. Right now I'm using Ubuntu and it's photo manipulation software sucks.

As far as the ports go...
The top port is the vent.
The second from the top goes to both valve cover ports via a tee hidden under the airbox.
The third from the top port now goes to the PCV valve in the block.
The forth and lowest port is now tee'd into the right bank (passenger side) so the oil can drain back into the engine.

 

Opened up the intake tract. From snorkel/pressure reservoir (whatever you wanna call it) to PCV. Even split open the torque box... nothin. Only a slight smattering of oil residue on the valve cover breather holes. And that from from 8 years of usage no doubt.

So it would appear my quart of oil is disappearing either out my exhaust, which would explain the seemingly rich running extra black outline on my tailpipe (which could also be the "catalyst inefficiency" p0420 I've had for the last year). Or getting burned up in the head. Could be a little bit of both but just hoping it's not the rings so I'm going in for another compression reading tomorrow. Was A-OK 6 months ago... so...

In summary, I guess this will prob be a pass on my desire for an AO. But I still think it's an invaluable write up so I'd def say carry on with the update thread, Maestro. The public will love you more than they do that Aluminium taped TB.... Speaking of - Any chance on outfitting me with the same 3'' elbow glued to a taped up torque box? I don't have the time to tinker with mine and I wouldn't want to drive to & fro from work without a tb & air filter till I get it right hah. Throw me a figure and I'll see if I can match it