http://subie.tv features the Crawford Air Oil Separator how to install on the http://projectsti.com 08 STI. Check out the site for more video installs of this Subaru. This is a modified version of the Crawford Performance Air Oil Separator found on the Ken Block Gymkhana car.
Check out http://projectsti.com for more videos and the buildup.
I spent almost half a day just trying to bolt down the aos back to the intake,that 2 bolt is really a pain in the ass..! I’ll try to continue installing tomorrow..do you have any suggestions to make it easier? Crawfords install video is a lie! Showing it looks like so easy.
"and secure it with a supplied zip tie"
Great workup! Noticed 1 thing was missing tho, after routing tube 3 from the turbo inlet to the AOS , tube 4 switches places with the previous left bank valve cover breather and the valve cover breather now goes to where the steel outlet used to feed the turbo inlet 😉
Does this same install process apply for the Crawford V2 AOS? I know there are additional coolant lines to be installed but can the rest of the install be performed using these steps?
Update: blackstone lab oil test result is perfect. It's been 7000 miles on this setup.
will this fit the 15 sti knowing it's practically the same engine
Update: 1000 miles later with aos and mishimoto. Catch can picked up 1oz of oil. Main engine oil is clean as new and at full mark.
Even with V2 Crawford aos install. My 2010 special edition STI still burns 1q per 1000 miles. Cobb data log show engine in perfect condition. Compression, leak down, spark plug test all came out perfect. 3 months back, I found solution by install a mishimoto catch can inline after AOS. Output port is reduced from 5/8" to 1/2". This somehow activated AOS at low rpm stop/go traffic ( where oil burns most). Can stopped ~1/8q after 3000 miles. Sti only has Cobb stage 1 mod. Stock intake and exhaust. Hope this helps. It took me 6 years, 75k miles to figure this out.
Or…. You can get a grimmspeed aos
Im sure i got a newer version of the AOS but mine came with all the clamps needed for those of you concerned with securing the hoses down. Also came with zip ties but mine AOS has another port and im wondering what that is…
Apparently Crawford doesn't know where the PCV valve actually is. It is NOT under the throttle body, it's that "Y" assembly that they keep talking about.
I don't know how much this kit is but zip ties, really?
Wouldn't it be better to use hose clamps that were metal? I feel like the zip ties aren't great for longevity.
Will this work for a 2015 STI?
Subaru what a pain in the ass to install a catch can
I am deciding between this and the Perrin which is very similar yet can be disassembled. Is there and advantage to either besides that?
?So basically you are:
-capping off the rear turbo inlet (at the electronic valve
-running both the valve cover breathers into the top side can tube
-running the one crankcase breather (on the block near the turbo) into the bottom side can tube
-running the can's outlet into the front turbo inlet
-routing the can's bottom drain to the one crankcase breather (doesn't that port have pressurized blowby under boost?)
This is simplifying the pcv system where all three crank sources run through the can so blowby will have to go into the can. Does this elimnate pcv when the car is under vacuum / at idle since you capped off the pcv valve?
I have a built hybrid block and get a LOT of blowby coating my intercooler and tubing with anything over normal (higher than 14psi or so) boost and need to decide on which setup to go with. I'm wondering about running a catch can on each side of pcv to keep its function or just use one crawford. Thanks for the excellent tutorial on installing the separator btw.
Yes, I need a tutorial for the V2 since I'm too nervous to splice into the main coolant line for my turbo : (
Hoses are reversed *
Does it matter which passanger side crossover tube you use on the intercooler? It seems like the tubes are reveresed on my 08 sti and I doubt it would really matter but one does have a lower height relative to the ground
false.
Grimspeed better
Yes.
its AMERICA LAND OF GREEDY FUCKING PIGS so the answer is yes
Is this process same for 2002 WRX?
my shit cracked too.. fuckin' subaru..
love imprezas you can ziptie every thing !
I don't like how there is zipties holding the hoses :/
Zip ties holding hoses that could potentually crack and pour oil into engine bay and start a fire! REALLY?
is it the same process as for non sti? i mean for wrx
LOL, the logic of having the oil drain into the crank case vent is bunk. Heat and pressure will just re atomize a good bit of that oil pushing it right back into the system. Not to mention, the PCV is important as it uses vaccum from the intake to pull junk out of the crankcase when the system isn't under pressure. Disconnecting the PCV reduces a good bit of "Cleansing" action from the ventilation system.
If you want a AOS to drain back into the sump, it should be done via the oil fill cap.
I'd rather go with my Grimspeed AOS setup. Much more simple and still the same performance as the Crawford setup and CHEAPER!
MAN.. all those factory rubber hoses are so soft and flexible. The ones on MY04 STI are all hard. The slightest bend to them and they crack and I'd be screwed.
Using zip ties is fucking ghetto. Are hose clamps too expensive to come with this $400 air/oil separator?
@conspiracyquality
All engines have some amount of blow by, whether they are NA or turbo, and no matter what condition the rings are in. Replacing the rings will not eliminate blow by since no piston ring seals 100%. Every factory engine with a PCV system lets some oil into the intake that can hurt performance. Installing a catch can is a good way to prevent this, on any car.
@hofmannsapprentice sticky or malfunctioning pcv valves are dirt cheap to replace even cheaper to spray out with some carb or brake cleaner. But really is this that big of an issue on Subaru's it has to have its own aftermarket fix? I agree it's better than burning oil but wow.
Just received my Crawford air/oil separator in the mail and expect to install next weekend… any tips for an install on a 2007 LGT?
this is kinda complicated for me.
@conspiracyquality sticky or malfunctioning PCV's can cause excess oil buildup, as these cars get older it's not a bad thing to do, its better than burning oil.
Seems to me like this is band-aid for a blow-by issue, but I don't know subies. Wouldn't the proper repair be to replace the rings that are crispy fried? Just wondering.
engine oil not staying in the engine????
nice put your wiring harness, with that plastic connector right next to the turbo. Suppose stock it's right over the turbo, so it's probably heated to take some heat. Factory turbo heat shield for the win I guess.