811615, 822615 - Air Oil Separator
Subaru WRX STI 2004 - 2021
Subaru WRX 2002 - 2014
Subaru Legacy GT, Outback XT 2005 - 2009
Subaru Forester XT 2004 - 2008
Congratulations on your purchase of the COBB Tuning Air Oil Separator! The following instructions will assist you through the installation process. Please read them BEFORE beginning the install to familiarize yourself with the steps and tools needed. If you feel you cannot properly perform this installation, we HIGHLY recommend you take the vehicle to a qualified and experienced automotive technician.
When installing the hoses and lines to and from the COBB Air Oil Separator, take special care to route them away from any sources of heat, ensure that they are free of kinks or obstructions, and secure them properly with zip ties to prevent movement and chafing. Utilize spring clamps at every connection point to avoid the potential for an air leak. Additionally keep in mind that the engine will move slightly so leave a small amount of play in the lines where it goes up to the AOS to allow for some movement without causing damage or stress on the lines.
With it off of the car, you can remove the metal PCV lines permanently.
Cable Control Throttle Body With Cruise Control and Horn.
Some vehicles mount a horn to a bracket on the top of the strut tower. You'll want to move this out of the way as it blocks access and space for the AOS.
Nex up we're working on replacing this section. With the one way valve in the line in both the original and COBB AOS, there is one side that is the "Vacuum" side going toward the intake side of the engine. While the other side is the Crankcase side of the engine, where oil vapor etc. is distributed to the turbo inlet and pcv valve.
Reference Fig.
Reference Figure. (02-14)
This sensor formerly measured the air between the crankcase breather fitting and the turbo inlet. Given that this funcitonality is a good thing, we'd like to retain it.
Reference Figure
This line can be re-installed after the TMIC installation which can make things easier as there are already a lot of hoses in the way. |
The back of the AOS now comes with this convenient bleeder screw. With the car cold but running, use a 1/8" allen wrench to remove the o-ringed bolt. The fitting should allow coolant and air to come out of the weep hole. Do this until no more air comes out and then re-install the plug hand tight. Over Tightening may cause damage to the sealing o-ring and cause a leak later on.
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