This document is to be used as a guide for the installation of a TurboXS High Performance Boost Controller (HPBC) to a turbocharged vehicle.  It is recommended that the installation of the product be carried out by a qualified mechanic.   

The TurboXS HPBC is to be installed in series with the pressure line running from the positive pressure side of the turbo to the wastegate actuator system. 

Pre-setting the Boost Controller

The HPBC has two (2) boost control mechanisms built into it.  One is a ball and spring system for large, coarse boost pressure ad j ustment and the other is a bleed valve system for fine boost pressure ad j ustment.  The ball and spring mechanism needs to be pre-set prior to installation into the vehicle as follows:   

Gently shake the High Performance Boost Controller backwards and forwards.  You will hear the ball and spring mechanism moving inside.  Take the ad j usting hex key and screw in the coarse ad j usting screw in the counter-clockwise direction until the ball and spring mechanism j ust stops moving when the valve is shaken (approximately 2 - 3 full turns in the counter-clockwise direction).  This will take up the spring slack and the ball is now j ust engaged.

Installation Guide

1/  Locate the wastegate actuator.  Note, it is usually mounted on the turbo.   

2/  Identify the flexible pressure hose running from the positive pressure side of the turbo to the wastegate actuator.   

3/   Remove the pressure hose fitted to the wastegate actuator and insert it over the brass nipple of the boost controller.  Note the inlet direction arrow on the boost controller.  Use the pre-existing hose clamp to secure the hose onto the boost controller.   

4/  Take the extension hose and fit it onto the blue colored nipple.  Fit the other and to the wastegate actuator.  Use the supplied hose clamps to secure the hose onto the nipples.

5/     Mount the TurboXS High Performance Boost Controller using the mounting bracket and screws located on the side of the boost controller to a secure part of the engine.   

Caution: Installing the TurboXS High Performance Boost Controller backwards will cause the vehicle to over-boost and may result in severe engine damage.  Ensure the arrow stamped on the boost controller is in the same direction as the inlet supply pressure from the turbo.  Failure to properly secure the Boost Controller nipples to the pressure hose can result in the disconnection of the wastegate actuator supply pressure.  If this occurs, the turbo boost pressure can rise to a dangerous level and could result in severe engine damage.   

Performance Tip

When increasing the boost pressure to higher levels (15 psi or higher), you will get more accurate, responsive and stable boost pressure by using a pressure supply line directly from the engine inlet manifold after the throttle body housing instead of the pressure line from the pressure side of the turbo as stated in step 3 above.  By supplying the pressure directly from the engine inlet manifold, pressure effects due to air being forced through the connecting pipes and intercooler are eliminated from the operation of the wastegate actuator system.  Ensure any previous pressure supply lines after the turbo are appropriately blocked.   

A d j usting the High Performance Boost Controller

Note, the vehicle will require a calibrated boost gauge to be fitted to the engine inlet manifold in order that the turbo boost pressure can be monitored while ad j ustment is carried out.   

1/     The High Performance Boost Controller should have been pre-set as per the pre-set instruction above prior to installation of the boost controller to the vehicle.   

2/     Identify the Fine A d j usting Screw located on the top of the boost controller.  With the Fine A d j usting Screw initially fully closed (unable to be wound any further in the clockwise direction), wind the Fine A d j usting Screw three (3) full turns in the counter-clockwise direction.  This will reduce the vehicle's turbo lag and increase the boost pressure by approximately one (1) to three (3) psi.   

3/     Start increasing the boost pressure by winding the Course A d j usting Screw in the counter-clockwise direction.  One (1) full turn of the Course A d j usting Screw will result in a two (2) to four (4) psi increase in boost pressure.   

4/     Increase the boost pressure as close as possible to the desired boost pressure using the Course A d j usting Screw.  Then use the Fine A d j usting Screw for final ad j ustment of the boost pressure.  If you can achieve the desired boost pressure by ad j usting the Course A d j usting Screw only then there is no need to touch the Fine A d j usting Screw.   

5/     The boost pressure can be decreased by winding the Course A d j usting Screw or the Fine A d j usting Screw in the clockwise direction.  However, D O NOT close the Fine A d j usting Screw to be less than two (2) turns open from the fully closed position.  

Note: A lways ensure that the Fine A d j usting Screw is opened at least two (2) full turns from the fully closed position.  If it is closed more than this, turbo lag may be experienced.  For optimal performance set the Fine A d j usting Screw to be two (2) turns open from the fully closed position.  If boost spiking is experienced open the Fine A d j ustment Screw in the counter-clockwise direction. 

Caution : This is a high performance product for racing use only.  No internal engine components can be warranted at greater than original equipment specifications.  Not applicable nor intended for use on emission controlled vehicles. 

End of Installation Guide