IAG IAG-ENG-7252 User manual

IAG Performance | 1203 Baltimore Blvd. Westminster, MD 21157 | Ph: 410-840-3555 | www.iagperformance.com
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IAG Competition Series Air / Oil Separator (AOS) For 2015-16 WRX
Part# IAG-ENG-7252
Tools Required: Ratchet, torque wrench, extensions,
needle nose pliers, hose cutter, snips/scissors, flat head
screw driver, hose clamping pliers, pop clip pliers
Sockets: 10mm, 12mm, 13mm, 19mm,
Wrenches: ⅞”, 8mm, 10mm, 13mm, 3mm & 5mm allen,
Other: Electrical Tape
Congratulations on the purchase of your Air/Oil Separator
(AOS) and thank you for choosing IAG Performance. This
installation manual is intended to guide you through the
removal of the factory PCV system and the installation of
the IAG AOS. If you already have an aftermarket catch can
or AOS installed, please consult the specific instructions for
your hardware to aid in its removal.
Parts List
Part Name
Quantity
Notes
Air/Oil Separator
1
Top Coolant Hose Assembly
1
43” Hose Length, ½” I.D., -8ORB
Bottom Coolant Hose Assembly
1
15” Hose Length, ½” I.D., -8ORB, ½” Straight Plastic Barb
AOS Vent Hose
1
55” Hose Length, 1” ID
Block Breather Hose Assembly
1
2.5” Hose to 90° Fitting to 44” ½” Hose
Drain & Lower Breather Hose Assembly
1
90° to Y Fitting / (x2) Hoses - 15” & 21”
Comp Series Upper Breather Fitting & O-ring
1
M4x6mm Fasteners for Breather Top Fitting
2
Preinstalled
AOS Drain Fitting
1
Preinstalled
½” Spring Clamp
1
Coolant Hose Spring Clamp
Mounting Bracket
1
M6x12mm
2
Mounting Bracket
6x10mm Bolt
3
Mounting Bracket
P
5
P
/
R
8
R
” High Temp Rubber Cap
2
(x1) Preinstalled on AOS Can
8” Zip Tie
15
11” Zip Tie
1
Used to mount vent hose under the car
ECU Relocation Bracket
1
6x20mm Bolts
2
ECU Bracket
6mm Washers
2
ECU Bracket
⅜” Plastic Plug
1
Blocks PCV Hose
⅜” NPT to ⅝” Brass Barb Fitting
1
Block Breather Fitting PCV Replacement Fitting

IAG Performance | 1203 Baltimore Blvd. Westminster, MD 21157 | Ph: 410-840-3555 | www.iagperformance.com
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URemoval - Please read through the entire removal instructions before proceeding
1. The engine needs to be completely cool before
beginning work.
2. Disconnect the negative battery terminal using a 10mm
wrench.
3. Using pop clip pliers remove the upper engine cover’s
(2) pop clips, then remove the cover from the vehicle.

IAG Performance | 1203 Baltimore Blvd. Westminster, MD 21157 | Ph: 410-840-3555 | www.iagperformance.com
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IAG Performance | 1203 Baltimore Blvd. Westminster, MD 21157 | Ph: 410-840-3555 | www.iagperformance.com
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4. Remove the (2) pop clips that hold the intake duct onto
the upper core support, then remove the duct from the
vehicle.
5. Some may find it easier to access things by removing the
passenger side radiator fan. This can be done by locating
the small grey electrical connector on the lower passenger
side radiator fan. Next disconnect the electrical connector
by pinching the plastic spring clip in and pull the connector
free.

IAG Performance | 1203 Baltimore Blvd. Westminster, MD 21157 | Ph: 410-840-3555 | www.iagperformance.com
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Shown disconnected above
6. Next using a 3/8”, ratchet and 10mm socket remove the
(2) 10mm bolts from the top passenger side radiator fan.
Carefully lift the radiator fan assembly from the vehicle.

IAG Performance | 1203 Baltimore Blvd. Westminster, MD 21157 | Ph: 410-840-3555 | www.iagperformance.com
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7. Next using a ⅜”, 3” long extension, ratchet and 12mm
socket remove the (2) 12mm bolts that hold the boost pipe
to the turbo. Then using an 8mm socket loosen the clamp
that holds the blow off valve. This can be done from above
or below the car. If removing from underneath the car
remove the OEM belly pan.
(Optional) Some find this easier: You can leave the BOV
attached to the boost pipe and release the pinch clamp on
the inlet and remove the BOV with the boost pipe.

IAG Performance | 1203 Baltimore Blvd. Westminster, MD 21157 | Ph: 410-840-3555 | www.iagperformance.com
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8. Using a flat head screw driver or 8mm socket and
ratchet loosen the hose clamp that holds the boost pipe to
the top mount intercooler. Remove the boost pipe from
the vehicle by first pulling it free from the blow off valve.
Then remove the pipe from the intercooler. If the rubber
insert comes out reinsert it back into the pipe.

IAG Performance | 1203 Baltimore Blvd. Westminster, MD 21157 | Ph: 410-840-3555 | www.iagperformance.com
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9. Using a 12mm socket, remove the intercooler mounting
bolts on either side of the intercooler.
10. Loosen the hose clamp on the intercooler outlet. Then
remove the intercooler from the vehicle being careful not
to damage the fins or ac lines.

IAG Performance | 1203 Baltimore Blvd. Westminster, MD 21157 | Ph: 410-840-3555 | www.iagperformance.com
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11. Using pop clip pliers remove the two pop clips that
hold the breather pipe to the intake manifold.
12. Using hose clamp pliers or needle nose pliers loosen
the spring hose clamp on the breather pipe as shown.
Then loosen the spring clamp that holds the breather to
the inlet pipe. Finally remove the breather pipe from the
engine retaining clip and remove the breather pipe from
the engine.

IAG Performance | 1203 Baltimore Blvd. Westminster, MD 21157 | Ph: 410-840-3555 | www.iagperformance.com
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13. Using the supplied ⅝” vinyl cap, cover the barb hole on
the inlet and secure it with a zip tie. Trim the excess of the
zip tie with snips or scissors.

IAG Performance | 1203 Baltimore Blvd. Westminster, MD 21157 | Ph: 410-840-3555 | www.iagperformance.com
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14. Using a 12mm socket, 3” extension and ratchet,
remove the (4) 12mm bolts that hold the EGR pipe onto
the EGR valve and intake manifold. Be careful not to lose
or damage the metal gasket at the EGR valve as it is
reused. Remove the pipe from the vehicle.

IAG Performance | 1203 Baltimore Blvd. Westminster, MD 21157 | Ph: 410-840-3555 | www.iagperformance.com
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15. Using hose clamp or needle nose pliers loosen the
spring clamp that attaches the PCV hose to the PCV valve.

IAG Performance | 1203 Baltimore Blvd. Westminster, MD 21157 | Ph: 410-840-3555 | www.iagperformance.com
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16. Pull the PCV hose free from the PCV valve and insert
the ⅜” plastic plug into the hose. Next using the OEM
spring clamp, secure the plug in the hose.
17. Using a 19mm socket, 8” extension and ratchet remove
the PCV valve from the engine short block.

IAG Performance | 1203 Baltimore Blvd. Westminster, MD 21157 | Ph: 410-840-3555 | www.iagperformance.com
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18. Next thread into the block the supplied ⅜” NPT to ⅝”
brass barb fitting. Using the 19mm socket, ratchet and
extension torque the fitting to 15ft / lbs.

IAG Performance | 1203 Baltimore Blvd. Westminster, MD 21157 | Ph: 410-840-3555 | www.iagperformance.com
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19. Remove the (4) wiring harness retaining clips from the
ECU mounting bracket. Using needle nose pliers squeeze
the locking tabs to free them from the bracket.
20. Using a 10mm socket, ratchet and 3” extension remove
the (2) 10mm nuts that hold the ECU to the bracket. Then
pull the ECU free from the bracket and place it aside in the
engine bay.

IAG Performance | 1203 Baltimore Blvd. Westminster, MD 21157 | Ph: 410-840-3555 | www.iagperformance.com
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21. Remove the (2) 10mm bolts that hold the ECU bracket
to the passenger side strut tower and frame rail as shown.
Then remove the bracket from the vehicle.

IAG Performance | 1203 Baltimore Blvd. Westminster, MD 21157 | Ph: 410-840-3555 | www.iagperformance.com
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22. Pry out the small plastic plug located under the ground
wire on the passenger side frame rail.
Next using a 10mm socket and ratchet remove the 10mm
bolt that holds the ground wire to the upper frame rail.
Then using needle nose pliers pull the white retaining clip
from the frame rail.

IAG Performance | 1203 Baltimore Blvd. Westminster, MD 21157 | Ph: 410-840-3555 | www.iagperformance.com
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23. Relocate the ground wire to the lower frame bolt hole
as shown using the OEM bolt. Tighten the bolt using a
10mm socket and ratchet.

IAG Performance | 1203 Baltimore Blvd. Westminster, MD 21157 | Ph: 410-840-3555 | www.iagperformance.com
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24. Locate the supplied ECU relocation bracket. Attach the
bracket using the (2) 10mm bolts that held the original
bracket to body of vehicle as shown. Using a 10mm socket,
8” extension and ratchet tighten the 10mm bolt on the top
frame rail. Then using a 10mm socket and ratchet tighten
the 10mm bolt on the side of the frame rail.

IAG Performance | 1203 Baltimore Blvd. Westminster, MD 21157 | Ph: 410-840-3555 | www.iagperformance.com
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25. Using a 10mm socket and ratchet remove the 10mm
bolt that secures the wiring harness onto the ECU.
Next remove the wiring retaining clip from the bracket and
remove the bracket from the vehicle.