Name: 7305 WGA STI Wastegate Actuator - Suits WRX STI 99-21
SKU: 7305
Price: 223.00 USD
Availability: InStock

Description

The WGA is a high-performance bolt-on internal wastegate actuator designed to bring boost on sooner and hold it longer!

The WGA is all about increasing the “area under the boost curve”. With a larger diaphragm than the OEM actuator, the WGA has more “control authority” over the wastegate flap. This makes it harder for exhaust backpressure to blow the wastegate open during spool up and at high RPM, two areas of the boost curve where the factory actuator can be overwhelmed. This benefit is particularly useful with Subaru’s factory “2-port” boost control system, which cannot effectively shut off pressure to the wastegate during spool up

Supplied with 3 springs and a unique turnbuckle pre-load adjustment, the base boost pressure can be configured and adjusted from 5psi to 24psi for the best possible boost control.

Read on for more technical information on wastegate springs, and how the correct spring selection can improve performance.

The WGA features a longer stroke, shorter height, and more adjustment than its rivals.

WGA part # 7305 is designed for Subaru WRX STi models from MY99-21, and will also fit most single-scroll IHI VF turbos. The 5psi and 10psi springs are installed for a base pressure of 15psi, and the 7psi spring is included in the packaging for further tuning options.

Please note that whilst this is a “bolt-on” product, it should be considered a tuning tool as it WILL increase boost pressure and therefore TUNING IS REQUIRED.

When it comes to external wastegates, some things you want big, others you want small – like big flow, small size, right?

GFB offers a range that are among the most compact external wastegates in their class, being shorter in height than their closest rivals without sacrificing flow.

All GFB wastegates feature an investment cast body made from 253MA chromium-nickel stainless steel, a CNC machined billet stainless valve, and all stainless steel weld-on fittings and hardware, whilst the diaphragm is nomex-reinforced silicone. All this adds up to a wastegate built to handle extreme conditions with reliability you can trust!

Most compact wastegate range on the market!
Body, valve, seat and all mounting hardware is CNC machined from high-temp stainless steel
Actuator housing CNC machined from billet 6061 aluminium
Nomex-reinforced silicone diaphragm
Internal shroud protects valve stem from excessive heat and prevents carbon-related sticking
V-band clamp mounting system
Made in Australia under ISO 9001

HIGH - PERFORMANCE INTERNAL WASTE GATE ACTUATOR - The GFB WGA

THE GFB WGA IS AN INTERNAL WASTEGATE ACTUATOR DESIGNED TO IMPROVE BOOST CONTROL ON TURBO SYSTEMS WITH AN EXISTING INTERNAL WASTEGATE.

When diving into the world of increasing your car’s boost pressure, the limits of a factory-fitted wastegate actuator can soon become apparent. Even with electronic boost control it is not always possible to overcome wastegate issues such as boost drop off at high RPM, unstable boost curve, or an inability to achieve target boost.
Upgrading to a GFB WGA ensures you get the best possible performance and response from your turbocharger!

WGA BENEFITS

(COMPARED TO A FACTORY-FITTED ACTUATOR):

Faster spool up
Less boost taper at high RPM
More stable boost control
Customizable spring rates
Supports higher boost pressure

It’s what we like to do here at GFB – maximize performance and minimize size.
Here’s how we did it with the WGA:

Industry-first diaphragm design - the WGA’s Nomex-reinforced silicone diaphragm is designed to achieve the largest effective diaphragm area with the smallest possible outside diameter. This gives the WGA more control authority over the wastegate flap, resulting in better boost control. It’s a bit like being the turbo’s puppet-master, rather than its puppet!
No unnecessary bulk sounds obvious, but attention to detail in the design means the WGA is the shortest actuator on the market.

Longest stroke – with 18mm of rod travel, the WGA is suitable for controlling the largest of internal wastegates, or the extra travel can be used to further increase boost pressure without having to change springs.
Unique pivoting rod guide – machined from PEEK (an extremely high-performance engineering polymer), the encapsulated spherical rod guide takes up significantly less height in the actuator body than other designs, whilst offering low friction and superior wear resistance.

MORE ADJUSTABLE, MORE EASILY.

Setting the base spring pressure correctly for your application can have significant performance benefits, so we made sure the WGA offers the best adjustability on the market!

We supply 3 stainless steel springs that can be used in any combination ranging from 5psi to 22psi, but that’s only the beginning. Whilst other brands may offer more spring options (sold separately), changing springs to fine-tune boost pressure is time consuming and quite frankly, a pain in the butt.

That’s why we added another industry-first: turnbuckle adjustment. Because the WGA was designed with a long stroke, it is possible to use some of that extra stroke length to fine-tune the base boost pressure in a matter of minutes without swapping
springs or removing the actuator.

As an added benefit, the turnbuckle makes swapping springs so easy that it can often be done without removing the actuator from the car!

Additional information

Weight	1.25 kg
Dimensions	8 × 17.5 cm