The air and oil separator is a must have unit for all Subaru engines! Constructed from high-quality aluminum, this handy unit will help you lower emission, keep the intake charge pipe clean, reduce the oil burned in the engine and reduce the detonation due to a dirty intake charge pipe. Tomioka Racing AOS is compatible with factory PCV system and it drains oil into the factory oil pan automatically.
INSTALLATION GUIDE FOR
TR AIR OIL SEPARATOR KIT
CONTENTS OF KIT:
(1) Air Oil Separator
(1) 8 ft. Oil Resistant Hose
(10) 6 in. Black Zip Ties
(2) ½ in. Hose Fittings
(1) ½ in. Adapter
(1) ½ in. Rubber Cap
(2) 5/8 in. to ½ in. Adaptor
Impreza WRX / STi 1993-2011
Step 1: Remove the oil filler cap and loosely install the Tomioka Racing (TR) Air oil separator (AOS) on to the oil filler tube.
Step 2: Unbolt bracket holding the map sensor and boost control solenoid.
Step 3: Disconnect the crankcase vent hose from the turbo inlet hose located under the bracket.
Step 4: Remove the disconnected hose and cut in half. Then install a 5/8” to 1/2" adapter in one end of each half as seen here.
Step 5: Reinstall one of the adapters from Step 4 back onto the open nipple on the turbo inlet hose then attach the supplied 1/2" hose to the other end and route under the intake manifold rearward as seen below.
Step 6: Install the other adapter from Step 4 onto the open nipple on the intake manifold and attach the supplied 1/2” hose to the adapter, route this hose forward as seen below.
Step 7: Re-install the MAP / EBCS bracket then route the 1/2" hose carefully around the MAP/EBCS hoses as seen below (routing mat vary).
Step 8: Attach the 1/2" hose facing forward to the AOS. Cut hose to length then install on the AOS and secure with zip tie. Route the 1/2” hose coming out from under the intake manifold along the bottom of the intercooler and to the AOS. Cut the hose to length and install on the AOS.
Step 9: Secure all hose ends with supplied zip ties and also secure all hoses away from any moving parts of the engine with zip ties.
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