Product Name:

BOV Kompact EM VR25

BOV Kompact EM VR25 (7^t^h Gen Nissan Z)

TS-0223-1X97

Product Description:

Product Number:

Document Version:

V1.00 Rev A

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IMPORTANT NOTES ON YOUR BOV

-

Turbosmart accepts no responsibility whatsoever for incorrect installation of this product which is potentially hazardous and can cause serious

engine 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 be

used on other applications if there is a control signal to actuate the BOV.

Ensure the engine is cold prior to installation.

RECOMMENDATIONS

- Turbosmart recommends that your Blow off valve (BOV) is fitted by an appropriately qualified technician.

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KIT CONTENTS

Please check that the following items have been provided in your EM Series BOV packaging

Part

Description

Turbosmart EM Series BOV

Allen Bolts (M6 Cap Screws)

Turbosmart Sticker

Quantity

Use

1

2

3

2

6

1

Main units

Allen bolts for mounting BOVS

1

Figure 1 - Kit Contents

TOOLS REQUIRED

-

Allen Key Set Metric

Basic Socket set

Torx Bits

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ABOUT YOUR EM 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.

The EM series BOV is available in two configurations, Dual Port and Plumb Back. The functionality of the BOV is still the same, there

is no performance difference between the two units, it is a personal preference if the user wishes to utilise a classic vent to atmosphere

sound or revert all bypass gasses back into the inlet tract of the turbocharger.

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.

Figure 2 - EM Series BOV Overview

2

FITTING YOUR EM SERIES BOV

Identify diverter valve location.

1

On the model designation, 7^t^h Generation Nissan Z (RZ34) the

Diverter valves are located on the compressor housing outlet

pipe. The RHD variant car passenger side is located up higher

and easier in the engine bay than the driver’s side, which is

located a little lower in the engine bay closer in line with the

chassis rail.

Pictured the two 10mm on the RHS airboxes. These are the

mirrored on the LHS airboxes and must be removed as well.

NOTE!

Allow for the engine to cool down.

If the diverter valve cannot be located, seek assistance from your

local specialist.

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 Airboxes

2

The two Airboxes need to be removed from the car to allow for

adequate movement. They are held on with two 10mm bolts for

each side, attached to the front radiator support of the car. With

the bolts removed the intake hoses are quick release

components that need the retaining clip to be removed to allow

for them to release the airbox from the car

These clips are what retain the airbox to the inlet pipe for the

turbo cool air feed. To release the three points of contact must

be pulled in these directions. Technically the dotted line should

release all of them if pulled lightly in that direction.

The Air Flow meter wiring will also need to be unclipped to allow

the boxes to be completely removed. This is easily removed from

the airbox.

NOTE!

It may not be necessary to remove the engine undertray

panel however it enables access if it is possible to work

underneath the vehicle.

LHS

RHS

3

Removing the OEM Front Engine Cover

3

Unclip the electronic connector by pulling the grey locking tab

back and then pushing down.

The front engine cover is held on with 1 x 5mm Allen key . This

is lightly held on and needs a small amount of force to unlock it

from its rubber bush. Pulled in an upwards in the location of the

arrow.

This can now be removed from the car and put in a safe place

until reassembly.

Once removed store the diverter valve and hardware in a safe

place.

Removing the RHS Divertor Valve

4

The OEM divertor valve is located near the shock tower. It is

located as seen below in the outlined circle. There are 3 x Torx

bolts holding the divertor valve on. It may be required to remove

some auxiliary brackets, wiring and components to allow for

easier access of each bolt. Beware of dropping these bolts

Fitting RHS EM Series BOV

5

Take 3 of the M6 bolts supplied of the 6 to fit the RHS EM BOV.

Use an M5 Allen key to fit these bolts. The electronic connector

can now be plugged into the car. Although polarity isn’t important

you do need to hear a positive click to ensure that the connector

is locked in.

4

Fitting LHS EM Series BOV

Removing LHS EM Series BOV

7

6

The Electronic gate must be rotated 90 degrees to allow fitment,

this has an adjustable nut on the actuator rod. It is important to

only move the actuator anti clockwise and only 90 degrees. The

Electronic gate is held on with 4 x 4mm Allen key bolts.

Removing the Left-hand side is similar with the airboxes already

removed. The Airbox Retaining clip must be released as

previously explained.

We need to remove the PCV pipe to allow for movement around

the turbo inlet area. There is a clip that holds the wiring in that

will need to be removed to allow movement.

Take the three remaining M6 bolts to fit the LHS EM BOV. Use

an M5 Allen key to fit these bolts. The electronic connector can

now be plugged into the car. Although polarity isn’t important you

do need to hear a positive click to ensure that the connector is

locked in.

With the wastegate clocked we need to move the loom down

slightly to accommodate for the change of position. There is

tape holding two bits of the conduit together than can be

removed as well as cable tie clips that can release the loom and

allow for move movement. Ensure that adequate strain relief is

available to the wastegate plug to ensure no issue at the

connector.

Here is the BOVs location, it is near the inlet of the turbo. We

need to remove the 3 x Torx T30 on the BOV as well as the

electrical connector.

Unclip the electronic connector by pulling the grey locking tab

back and then pushing down. The electronic actuator also can

be unplugged there is no locking tab on it.

Refitting Removed Components

8

Once the Turbosmart EM has been fitted correctly to the car, we

can refit the parts that have been removed or unplugged

including hoses or electrical components.

We need to refit the Airboxes, an audible click must be heard

when reconnecting the car airboxes to the car. As well as the 4 x

1

0mm bolts that hold the airboxes on.

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

the metallic portion of the flats and not on the plastic cover.

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

-

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 tech@turbosmart.com.au with information of your engine configuration and

photos of installation.

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