Product Name:  
BOV Kompact EM PB/DP VR24 Subaru WRX (FA24F)  
BOV Kompact EM PB/DP VR24 Subaru WRX (FA24F)  
TS-0223-1X68  
Product Description:  
Product Number:  
Document Version:  
V1.00 Rev A  
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IMPORTANT NOTES ON YOUR BOV  
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Turbosmart accepts no responsibility whatsoever for incorrect installation of this product which is potentially hazardous and can  
cause seriousengine damage or personal injury.  
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The EM series BOV is designed for use as a factory replacement for a turbocharger that utilises an electronic diverter valve, this  
valve can beused on other applications if there is a control signal to actuate the BOV.  
Ensure the engine is cold prior to installation.  
For Standalone ECU configuration, ensure valve is not energised for indefinite periods of time as this can cause significant life  
detriment to theactuation solenoid.  
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RECOMMENDATIONS  
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Turbosmart recommends that your Blow Off Valve (BOV) is fitted by an appropriately qualified technician  
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Please check that the following items have been provided in your EM Series BOV packaging  
Part  
Description  
Turbosmart EM Series BOV  
Turbosmart Sticker  
Use  
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2
3
Main unit  
3 x Allen Bolts (M6 Cap Screws)  
Allen bolts for mounting Kompact to mount  
Figure 1 - Kit Contents  
TOOLS REQUIRED  
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5mm hex key  
8mm Socket  
Screw drivers  
T30 Torx  
Socket Set  
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ABOUT YOUR KOMPACT SERIES BOV  
Turbosmart has developed a unique “plug and play” diverter valve (or bypass valve) upgrade for your vehicle that is currently  
equipped with an electronic diverter valve. While we have developed this unit to be as simple as possible for you to install, we have  
not compromised on performance. This unit will not leak under elevated boost pressures and will still provide you with rapid  
response ensuring that all the OEM calibration strategies are not interfered with, providing you with maximum boost performance  
while the advanced strategies of the OEM’s are retained.  
As the valve is completely controlled by the factory engine control unit, the factory diverter valve is almost silent, due to our  
construction, it is possible that your EM series will be much more audible. By being able to hear the unit actuate, occasionally the  
valve may be opening for a few seconds under the following events such as traction control, cruise control management, rapid  
gearchanges and varying throttle position changes, these are all coded as part of the torque management software in the OEM  
engine control unit, there is no adjustment available over these functions via our product. By hearing these events, it is not  
abnormal, it is completely normal for the EM series BOV to be considered “very active” as it is protecting your turbocharger from  
surge events or bypassing air for torque management purposes.  
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Plumb Back Orientation Indicator  
Electronic Actuator  
Controls when the valve  
opens,and closes based on  
OEM signal  
A flat on the flange, acts as a visual  
cue to install the BOV in the correct  
position relative to the plumb back  
pathway.  
Control Signal Plug  
Connect to OEM harness  
Flange Mounting Holes  
Bolt to turbo compressor  
cover  
Sealing O -Rings  
(Underneath) Ensures the  
valve does not leak  
compressed air.  
Plumb Back Port  
(Underneath) Recirculates  
excess air to turbocharger  
inlet  
Figure 2 - EM Series BOV Overview  
(Figure for illustration purposes only, actual product may vary slightly  
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FITTING YOUR EM SERIES BOV  
Identify OEM Diverter valve location  
1
On the model designation Second Generation Subaru WRX ’22  
Onwards the Diverter valve is located on the compressor cover  
of the turbo. It requires some intake components to be removed  
for ease of install. Access from bottom is required.  
Removing OEM Charge Pipe  
3
The Turbo Inlet pipe can be removed to allow for more access  
to the OEM Divertor valve. This is held on with an 8mm hose  
clamp. Once removed it can simply be moved out of the way.  
NOTE!  
It may be required to remove auxiliary components to  
access the diverter valve, ensure you consult your local  
specialist or a service manual for correct disassembly  
procedures.  
Removing OEM Undertray  
2
The OEM Undertray cover needs to be removed for ease of  
access. This is done by removing all the trim clips that hold it on  
as well as 2 x 12mm bolts at the front (Dashed Line)  
There is also a Turbo Sump Guard that will need to be  
removed. This is held on with 4 x 12mm Bolts  
Two clips are hidden behind the front wheels on each side, for  
ease of access the wheels can be placed at full lock to allow  
access to the part. Ensure if you remove the wheels that the car  
is sufficently supported before working underneath the car.  
3
Unplugging PCV Hose  
Fitting Turbosmart EM  
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Prepare the 3 x Allen bolts required for fitting, Ensure that both  
O rings are present before installing.  
This picture is taken just above the Turbo. We need to remove  
the PCV Hose, we simply remove the quick disconnect clip  
forward and once locked out of place the Quick disconnect can  
be pushed up and off its locking seat. This allows a path for the  
valve to be removed and fitted in.  
Ensure no fouling on any parts close by, a nice path for the  
electrical connector should be considered. Ensure the parts clip  
together correctly and are locked in.  
It is much easier to get all three bolts in loosely before  
tightening up. This will ensure the valve sits correctly.  
It is important to ensure that no bolts are lost during installation  
as the Turbo intake pipe is open and a lost bolt could cause  
catastrophic failure.  
Removing OEM Diverter Valve  
5
We can see the stock diverter valve in place. It is held on with 3  
x T30 Torque bits. Once removed the valve needs to be  
unclipped from the car Pressure is required to be pushed on the  
clip closest to the valve indicated by the arrow. The clip can be  
pulled apart at that point.  
4
Refitting Removed Components  
7
Once the Turbosmart EM has been fitted correctly to the car,  
we can rectify the parts that have been removed or unplugged.  
The PCV must be re seated on the turbo. The locking clip will  
need to audible click back onto the car.  
The 8mm hose clamp that hold the intake on must be refitted  
the turbo intake.  
Finialising your EM series BOV installation  
8
Congratulations, your EM Series BOV is installed and ready  
for use. Double check all electrical connections and fasteners.  
The Turbo Oil Sump guard must be reinstalled as well as the  
undertray.  
5
CHANGING THE ELECTRONIC ACTUATOR  
Remove Your EM series BOV.  
1
Install New Electronic Actuator into your  
EM series BOV.  
3
Remove the electronic plug from the EM series BOV and  
loosen the hose clamps on the inlet and recirculation hoses.  
Remove the BOV from the vehicle.  
Ensure the O-rings on your new actuator are correctly seated  
in the grooves before installation. Also take not to damage  
the O Rings on burrs/threads during assembly.  
NOTE!  
Cosmetic engine covers may be required to be removed  
prior to the assembly being visible.  
CAUTION!  
The turbocharger assembly may require the vehicle to  
be raised on a hoist or jacked up and secured using  
vehicle jack stands. Ensure your safety is not  
compromised.  
O-Rings  
Remove Electronic Actuator from your EM  
series BOV.  
2
Using an 11mm open end wrench in the flat sides of the  
solenoid, undo the actuator in an anti-clockwise direction  
when viewed from the end. Ensure the wrench is placed on  
CAUTION!  
Failure to ensure O-rings are seated correctly may lead  
to cutting of an O-Ring and unexpected results from the  
EM series BOV.  
Slowly insert the new actuator while turning in a clockwise  
direction to avoid tearing the O-rings.  
Ensure the cavity is free from debris using avoiding shifting  
dirt into the passages.  
Tighten the new solenoid into the EM series BOV ensuring  
the wrench is on the metallic portion of the solenoid.  
NOTE!  
Tightening the solenoid on the plastic cover may result  
in unrepairable damage to the solenoid.  
6
TROUBLE SHOOTING  
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It is important that any issues are resolved before heavy driving.  
BOV not actuating - Confirm electrical signal plug is connected appropriately, as the plugs are new, some force may  
be required to click the plug into place. The car will experience heavy surge if not actuating.  
Valve is staying open – Confirm the valve has O-rings as they may have been dropped or lost during installation.  
Boost pressure loss or lower than before - Confirm the valve has O-rings as they may have been dropped or lost  
during installation.  
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Failing the above, submit a technical request to tech@turbosmart.com.au with information of your engine  
configuration and photos of installation.  
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