7
EXTERNAL WASTEGATE CONNECTION
The first method of installation is a one port connection. If the desired boost level is not achieved i.e. boost level is too low, or not
controllable, it is recommended that the wastegate spring be changed to a spring which is closer to the desired boost pressure or to trial
a 2 port connection method.
There are 3 different 2 port connection methods that can be trialled to achieve different results. The 2 port method (1) can be used if
there is high exhaust manifold back pressure forcing the valve open. The 2 port method (2) allows the user to achieve the maximum
boost pressure their turbo system is capable of. If a wide range of boost pressures is desired i.e. 5
– 40 PSI, the 2 port method (3) with
a 4 port solenoid (sold separately
– TS-0301-2003) might be needed.
A single solenoid can be used to control twin wastegates in a twin turbo setup but it is recommended that twin solenoids are used in
twin turbo setups to reduce the length of the pressure hoses to aid in control and response of the wastegates.
Single port, single solenoid, single turbo connection Method
(Basic single wastegate setup)
Port 1 of solenoid vent to atmosphere
Port 2 of solenoid to bottom port of wastegate
Port 3 of solenoid to Pressure only source
Single port, single solenoid, twin turbo connection Method
(For straight configuration twin parallel turbocharger engines E.g. RB26DETT)
Port 1 of solenoid vent to atmosphere
Port 2 of solenoid to bottom port of wastegate
Port 3 of solenoid to Pressure only source
Block off other turbocharger pressure port (if needed)
External wastegate
Bottom port of
wastegate to port 2
of solenoid
Top port vent to
atmosphere
Turbocharger
Port 1 of solenoid
vent to atmosphere
Pressure only to Port
3 of solenoid
Tee Piece
Port 2 to bottom port
of both wastegates
Solenoid
Pressure only to Port
3 of solenoid
Plug pressure port on
one turbo only
Port 1 of solenoid
vent to atmosphere
Vent top port of both
wastegates
