🔧 Product Description
The GFB 7304 Internal Wastegate Actuator (TD04 Fitment) is a high-performance upgrade designed to improve boost control, response, and stability on turbocharged engines equipped with Mitsubishi TD04-based turbochargers.
Engineered as a direct bolt-on replacement for the factory actuator, the WGA 7304 increases control authority over the wastegate flap by utilising a significantly larger diaphragm area and stronger, more adjustable spring system. This ensures more consistent boost control under high load and tuned conditions.
⚙️ Key Features
- Direct-fit internal wastegate actuator for Mitsubishi TD04 turbos
- Larger diaphragm area than OEM actuator for improved control
- Supplied with 3 interchangeable springs for tuning flexibility
- Adjustable turnbuckle pre-load system for precise boost setup
- Longer stroke design for improved wastegate authority
- Compact housing for improved fitment over factory unit
- Designed for high-performance and tuned turbo applications
🏁 Performance Benefits
⚡ Improved Boost Stability
Stronger actuator control prevents exhaust backpressure from forcing the wastegate open prematurely.
🚀 Faster & More Consistent Boost Response
Helps maintain stable boost levels across gear changes and load variations.
🔒 Greater Boost Control Authority
Allows more precise tuning of base and peak boost pressures.
🛠️ Enhanced Turbo Efficiency
Optimised wastegate control improves spool consistency and drivability.
🔬 Adjustment & Setup
The GFB 7304 includes multiple spring options for flexible tuning:
- 5psi spring
- 7psi spring
- 10psi spring (included for higher base pressure setups)
Factory configuration typically provides a 12psi base setup, with adjustment range from 5psi to 24psi depending on spring combination and preload settings.
⚙️ Engineering Overview
Unlike OEM wastegate actuators, which can be limited by small diaphragm size and weak preload control, the GFB 7304 increases mechanical control over the wastegate arm. This reduces the risk of boost creep or premature wastegate opening under high exhaust pressure conditions.
The result is a more stable boost curve and improved tuning headroom for modified turbo setups.
🚗 Vehicle Applications
- Mitsubishi TD04 turbo platforms
- Subaru WRX MY97–07 (factory TD04 turbo applications)
🔩 Specifications
- Product Type: Internal Wastegate Actuator
- Model: GFB 7304
- Turbo Compatibility: Mitsubishi TD04
- Spring Range: 5psi / 7psi / 10psi included
- Boost Range: Approx. 5psi – 24psi (setup dependent)
- Adjustment: Turnbuckle preload system
- Fitment: Direct bolt-on replacement
🛠️ Installation Notes
- Bolt-on replacement for factory TD04 actuator
- Tuning required after installation (boost increase expected)
- Designed for performance and modified engine setups
- Spring selection affects base boost pressure significantly
⚠️ Important Note
This product is a performance tuning component, not a simple replacement part.
Installation will typically increase boost pressure and therefore ECU tuning is required to ensure safe operation.
💡 Why Choose the GFB 7304?
If you want:
- Stronger and more stable boost control
- Improved turbo response and consistency
- Adjustable base boost settings
- Better wastegate authority under high load
- A reliable upgrade over OEM actuators
👉 The GFB 7304 is a proven solution for serious TD04 turbo performance setups.
🏆 Perfect For
- Subaru WRX TD04 turbo upgrades
- Tuned turbocharged EJ engines
- Performance street builds
- Boost control improvement projects
- Enthusiasts upgrading OEM wastegate reliability
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