Description

The main goal for the EX50 was to create a wastegate that had a very large flow capacity in a package that is physically as small as possible.  This was achieved with the use of CAD design which allowed GFB to minimise the amount of unnecessary bulk (particularly on the actuator). Good flow around a poppet-style valve depends on a smooth and generous bowl area into which the valve lifts.  Many brands do not allow enough room around the valve head for good flow, instead relying on increasing the valve travel as a band-aid solution.

Joe Signorelli of Rotormaster and GAS Motorsport has done extensive testing on the EX50, on various high-powered circuit and drag engines (both piston and rotary), and most notably, on their 2JZ powered Celica. Of the EX50 Joe says “I couldn’t be happier with the way it performs.  Our circuit car comes into the pits after a race with the manifold glowing, and the boost never varies”.

• Body, valve and seat are made from high-temp stainless steel
• Actuator housing machined from billet 7075 aluminium – much stronger & harder than 6061
• Flow tests show that for the same valve lift, the EX50 outflows its nearest competitor by 18%
• Internal valve shroud protects valve stem from excessive heat and prevents carbon-related sticking
• Top-hat style Nomex-reinforced silicone rolling diaphragm for longer valve travel
• 90° banjo-style boost hose connectors