In this guide we’ll show you how to install a Turbosmart Kompact Shortie EVR05 Blow Off Valve (BOV) in either Plumb Back or Vent to Atmosphere (Whooshing noises!) configurations.

This guide is suitable for MK7 Golf R, GTI, Audi A3, S3 and other models with the 2.0L EA888 engine.

Difficulty Rating


Tools/Parts Required


Step 1

Remove the engine cover by lifting the front, followed by the rear of the cover.

Step 2

Remove the air intake pipe. There are two pipe clamps located at either end, depending on your model it may be a spring-based clamp or screw clamp.

Step 3

Disconnect the electrical connector on the OEM blow off valve.

Step 4

Disconnect the Positive Crankcase Ventilation (PCV) Hose from the turbo inlet elbow. This is done by squeezing the sides and lifting upwards. You can now spin the connector away.

Step 5

Loosen this screw to remove the turbo inlet. The screw does not need to be entirely removed.

Step 6

The turbo inlet can now be removed. Turn clockwise approximately 1/4 turn and it will loosen from the turbo.

Step 7

Pull the turbo inlet away and remove from the vehicle.

Step 8

Unscrew the factory blow off valve from the turbo. There are three TORX screws located on the base of the valve.

Step 9

Here’s a picture of the turbo housing with the blow off valve and intake pipe removed.

Step 10

Now it’s time to install the Turbosmart Kompact Shortie Blow Off Valve (BOV)!

Take note of the flat edge on the flange, it must face towards the turbo inlet as shown in the next step.

Step 11

Match the flat edge to the line marking as shown in the image. Screw down the Turbosmart BOV with the new screws provided.

Step 12

The BOV is now installed.

The preset spring tension from factory should be suitable for your vehicle. Adjustments can be made to soften or harden the spring tension, effectively changing how easily the BOV opens when the intake manifold is in vacuum.

Step 13

We will now install the boost reference adapter. Unscrew the MAP sensor and gently pull the sensor out of the intake manifold.

Step 14

Insert the Turbosmart boost reference adapter and screw down using the OEM screw.

Attach one end of the vacuum line and secure with a hose clamp. Thread sealant should be used on the hose barb which is screwed into the boost reference adapter.

Step 15

Using the supplied screw, attach the MAP sensor to the boost reference adapter.

Step 16

Neatly route the vacuum line around the engine, cut to size and attach to the Turbosmart Kompact BOV. Keep the hose to the shortest length possible. See the final step for our routing.

Step 17

Connect the supplied resistor to the factory BOV wiring loom. Neatly cable tie this to a nearby loom.

Step 18

Well done! Your Turbosmart Kompact EVR05 Blow off Valve is now installed. Gently cable tie the vacuum line for neatness, ensuring the cable ties are not compressing the hose. Reinstall all intake piping and your engine cover by reversing the steps. Start your engine and check for any air leaks.

Go for a drive and enjoy your BOV! Optimal blow off can be achieved by maintaining a sharp throttle response (E.g Race / Sport Mode).

You may hear some flutter at low RPM where there is insufficient manifold vacuum to open the BOV. This can be reduced by turning towards ‘Soft’ in half turn increments. Low amounts of flutter at low RPM pose no harm to the turbo.

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