Product Name:  
BOV Kompact EM Dual Port VR23 - N20  
BOV Kompact EM Dual Port VR23 - N20  
Product Description:  
Product Number:  
Document Version:  
V1.00 Rev A  
Turbosmart accepts no responsibility whatsoever for incorrect installation of this product which is potentially hazardous and can  
cause seriousengine damage or personal injury.  
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.  
Turbosmart recommends that your Blow Off Valve (BOV) is fitted by an appropriately qualified technician  
Please check that the following items have been provided in your EM Series BOV packaging  
Turbosmart EM Series BOV  
Turbosmart Sticker  
Main unit  
3 x Allen Bolts (M6 Cap Screws)  
Allen bolts for mounting Kompact to mount  
Figure 1 - Kit Contents  
5mm hex key  
Screw drivers  
Socket Set  
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.  
Electronic Actuator  
Controls when the valve  
opens,and closes based on  
OEM signal  
Control Signal Plug  
Connect to OEM harness  
Flange Mounting Holes  
Bolt to turbo compressor  
Sealing O -Rings  
(Underneath) Ensures the  
valve does not leak  
compressed air.  
Plumb Back Orientation Indicator  
A flat on the flange, acts as a visual  
cue to install the BOV in the correct  
position relative to the plumb back  
pathway. IF Fitted  
Plumb Back Port  
(Underneath) Recirculates  
excess air to turbocharger  
Figure 2 - EM Series BOV Overview  
(Figure for illustration purposes only, actual product may vary slightly  
Identify OEM Diverter valve location  
Here the wastegate actuator has been moved up to allow for  
access to the OEM Diverter Valve.  
On the model designation 6th Generation BMW 3 Series  
F30/1/4/5) N20 Engine the OEM Diverter valve is located on  
the underside of the side of the turbo. This engine is common in  
the BMW fleet and some applications might be slightly different.  
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  
Removing OEM Diverter Valve  
There are three T30 Torx bits holding the diverter valve, there  
are two bolts that are located on the back side close to the  
block, these are the hardest to remove.  
The Clip has a grey tab that must be pulled back allowing the  
tab to be pressed down and removed.  
The intake has been removed for this photo to show the location  
of the BOV, although it is not necessary to remove for installation.  
Removing OEM Electronic or Vacuum  
Removing the OEM Wastegate controllers although can be  
different are still held on via the same mount. This has two Torx  
45 screws. These are located on the underside of the picture  
below. We also need to unclip the connector.  
Installing Turbosmart BOV.  
Refitting OEM Wastegate  
It is helpful to remove the solenoid from the BOV to allow for  
ease during fitment, due to the swivel flange. We can move the  
BOV around to allow for some help during install, the bolt not  
We must now use the two T45 Torx bits to reattach the OEM  
wastegate to the car. Again, it is a lot easier to keep the first  
screw loose until the second one is attached. Once both in the  
wastegate can be torqued correctly.  
pictured, located at the bottom should be the 2 bolt to place in.  
Lightly taping the bolt to the Allen key allows for the bolt to stay  
attached to the tool as it is placed on. Once on, the third bolt  
can be placed on. Ensure not to tighten until all three Allen bolts  
are on this will make it a lot easier to install.  
Finalising your Install  
It is important to check for leaks and correct operation as well as  
listening for compressor surge. This noise is the sound of the  
boost pressure air running back into the turbo causing cavitation.  
Installing Turbosmart BOV Electrical  
Now the car can be taken for a test drive in a safe environment  
and listen for the correct operation and that no turbo charger  
surge occurs  
We the BOV in place and tightned up, we can now refit the  
solidond ensuring not to damage O-Rings will refitting. We need  
to have the solenoid pointing out allowing for install. We also  
need to install the Electrical connector. Ensuring that the  
connector seats correctly.  
Remove Your EM series BOV.  
Install New Electronic Actuator into your  
EM series BOV.  
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.  
Cosmetic engine covers may be required to be removed  
prior to the assembly being visible.  
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.  
Remove Electronic Actuator from your EM  
series BOV.  
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  
the metallic portion of the flats and not on the plastic cover.  
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.  
Tightening the solenoid on the plastic cover may result in  
unrepairable damage to the solenoid.  
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.  
Failing the above, submit a technical request to with information of your engine  
configuration and photos of installation.