GFB EX50 User Manual

EX50 50mm External Wastegate

Installation Instructions

P.O. Box 1017 Riverwood NSW 2210

Ph: [phone] Fax: [phone]

Website: www.gfb.com.au Email: [e-mail]

GFB EX50 Wastegate

Packing list:

• Assembled EX50 50mm wastegate, fitted with:

o 1 x 13psi spring (60mm O.D.)
o 2 x V-band clamps
o 1 x outlet weld-on flange (part # 7041)
o 1 x inlet weld-on flange (part # 7051)
o Valve seat

Included in box:

• 2 x banjo hose connectors & 1/8” BSP bolts

Installation

Install the boost nipples using a 5mm hex key, making sure that the head of
the banjo bolt sits into the large tapered seat on the banjo as shown. Position
the nipples in the best orientation for the installation. The thread is 1/8”
BSP, which is a commonly available thread should you wish to use a
different type of hose fitting.

Weld-on fittings:

stainless steel fittings, which need to be welded onto your turbo exhaust
manifold and exhaust system, onto which the EX50 is mounted using the
supplied v-band clamps. The inlet and outlet weld-on fittings are both
different, having been designed for the pipe that is most suitable for each
purpose.

The inlet fitting, which is welded to the exhaust manifold and supports the weight of the wastegate, is best suited to 1.5”
(48mm) nominal bore Schedule 10 or 40 pipe – a commonly available heavy-walled pipe. The outlet fitting is designed
to accept 2” (50mm) O.D. thin-walled pipe, which is commonly used for exhaust systems and screamer pipes. Of
course, it is possible to use different size and wall-thickness pipes than those recommended, provided a suitable weld
can be achieved. The weld-on fittings are available separately from GFB if required.

The inlet fitting should be welded to the exhaust
manifold after all the exhaust runners have
merged, and in a position that promotes smooth
flow to the wastegate – fast-moving exhaust gas
is reluctant to make sharp turns, which
significantly reduces the flow potential through
the wastegate. The diagram opposite shows a
suggested installation location.

On any street-driven car, the wastegate outlet
MUST be connected to the vehicle’s exhaust
system (before any catalytic converters and
mufflers), and should be done in a way that
allows the gases to merge smoothly. On race
cars where regulations allow, the outlet can be
routed out of the engine bay to atmosphere.

Already fitted to the EX50 you will find two

Setting up the EX50

Use the following guide to help set up your EX50. You should determine the minimum and maximum boost pressure
that you want to run (if you are not planning to vary the boost, then the minimum and maximum are the same), and your
control method.

Care should be taken when selecting boost pressures, and it is always best initially to err on the conservative side, until
the engine can be run on a dynamometer 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.