Turbosmart BOOST CONTROLLERS – ELECTRONIC - e-Boost1 (2002-05) – Complete User Manual - Manual (Page 5)

e-Boost-40/60 Instructions
Page 5
PART NUMBER
FG-EBOOST-
40/60
2f. External Wastegate Connection
Most external wastegates share a similar design layout.
Use the diagram to help identify the “top” and “bottom” port of your
wastegate.
- When pressure is applied to the “bottom” port of a
wastegate, i.e. underneath the wastegate diaphragm, it acts
against the wastegate spring and the wastegate valve opens.
-
When pressure is applied to the “top” port of a wastegate,
i.e. above the wastegate diaphragm, its acts with the
wastegate spring and helps to close the wastegate valve.
There are two methods for connecting the e-Boost to an external wastegate. The method used depends on the following factors.
- The size of the spring fitted in your wastegate i.e. The boost pressure achieved by the wastegate spring only.
- The desired level of boost pressure and the difference between this and your wastegate spring pressure.
- The size of your turbocharger and wastegate and the resulting exhaust manifold backpressure in your system
Turbosmart recommends using the “Two port” connection method (1) as a starting point. If this connection method does not achieve the
desired boost pressure, fit a heavier wastegate spring to increase your minimum boost pressure, or use the next connection method.
WARNING! Fitting a heavier wastegate spring may cause a higher than expected increase in boost pressure.
Turbosmart recommends resetting the Boost Set Point values to Zero and measuring the new minimum boost pressure achieved by the new
spring, before increasing your Boost Set Point values.
2g. “Two Port” Connection Method (1)
Connect the three ports on the e-Boost solenoid according to the diagram below.
- Port (1) Connects to a “boost only” pressure source, typically
from the compressor housing on the turbocharger. If your
turbocharger does not have this fitting, connect to a “boost
only” pressure source before the throttle-body or butterfly.
Do not connect to the intake manifold, as the pressure signal
will have both vacuum and boost pressure.
- Port (2) Connects to the “Top” port on the external wastegate.
For Further information on external wastegate port
identification see section 2f.
- Port (3) vents pressure from the e-Boost solenoid. Connect
this hose to the intake side of the turbo, between the air
cleaner and the inlet on the front of the turbocharger.
Otherwise connect a short piece of the silicon hose and face
the vent downwards to stop water or debris entering the
solenoid.
- Connect the “Bottom” port on the external wastegate to the same “boost only” pressure source as Port (1) on the solenoid. For
Further information on external wastegate port identification see section 2f.
- Use a tee-piece (not supplied) to share the “boost only” pressure source if necessary.
If you are unable to achieve your desired boost pressure it is normally due to exhaust manifold backpressure forcing the wastegate valve open.
To increase your boost pressure further, fit a heavier wastegate spring to increase your minimum boost pressure, or use the “Two Port”
connection method (2) as below.