If no boost controller is being used connect the boost pressure source ( often found on a port
between cylinder head intake ports & throttle body ) to one of the bottom air ports on the wastegate.
The boost only pressure source should be sourced from as close to the compressor side of the turbo
as possible. This configuration results in a boost pressure that is dictated by the wastegate spring –
you must change the spring to alter the boost level you wish to run.
The unused upper actuator port should be left open to atmosphere, but if there is a chance that
containments could enter into the upper port, either remove and rotate the cap, or connect a short
length of hose to the nipple and route to a safe location.
If a manual boost controller is too be used follow the no boost control option and tee piece the boost
controller into the pressure hose from the bottom air port of the wastegate. This will allow the boost
to be easily increased above the base level. The controller does this by reducing the pressure getting
to the wastegate - the more the controller bleeds off, the higher the boost.
It is always recommended to consult the instructions of the brand manual boost controller you are
using.
If you are using an electronic boost controller with a mac valve you should consult your brands boost
controller instruction manual for specific information on how each of the ports of the solenoid valve
should be connected.
WASTEGATE SPRING SELECTION
The Aeroflow Performance wastegate has a variety of springs to suit different boost levels. Pre-installed with 1
Bar ( 14psi ). Different spring combinations may be required to suit different boost requirements and tuning
which are sold separately please refer to chart for more information on these springs. The tuner can use
combinations of up to 3 springs to achieve the base boost pressures required. To aid in the identification of
these springs they are colour coded. When selecting your spring rate, the total boost psi pressure is
determined by adding the spring rates together.
Wastegate spring selection will determine the minimum and maximum boost pressure that you want to run,
and your control method. Care should be taken when selecting boost pressures until the engine can be run on
a dyno to ensure safety. Always consult an expert when making boost changes, and it is recommended that
the car be checked on a dyno, as high boost and/or lean air/fuel mixtures can cause engine damage or worse,
total failure.
The lowest boost your car can run is determined by the spring installed, and boost can then be increased
through the use of a boost controller. It is recommended to select springs so that your maximum boost is no
more than double the spring that is installed into the wastegate. Whilst it is possible to increase boost beyond
this, you may find that boost becomes less stable and harder to control. This is because the boost controller
must bleed most of the control pressure signal to the actuator, so the wastegate is less able to self-correct for
changes in manifold pressure.
WARNING : It is recommended to reduce your boost controller back to its minimum setting, and monitor
your new minimum boost level with the new spring or springs, before increasing your boost pressure. Failure
to do so can lead to severe detonation and engine damage. Any damage incurred, as a result of detonation
from excessive high boost levels or improper installation is the customer’s responsibility. Aeroflow
Performance recommends that the air/fuel ratio be checked while setting the boost levels, as raising your
boost levels will change your air/fuel ratio of your tune up and could cause engine detonation or damage.
For more information or technical enquires
Contact: Aeroflow Performance on
Phone: (02) 8825 1999 Website: www.aeroflowperformance.com
