Forge Motorsport Adjustable Actuator for Subaru IHI VF35/VF34 Turbo GDB

Forge Motorsport was among the first to develop high-performance billet aluminum turbo actuators, initially for iconic models like the Cosworth, Renault 5 GT Turbo, and Lancia Delta Integrale. Today, we offer one of the most comprehensive actuator ranges on the market.

Installing a Forge actuator allows precise boost tuning, delivering sharper throttle response and improved control. The unit comes standard with a spring optimized for factory or slightly increased boost levels. For tuned applications requiring higher boost, a stronger spring is available upon request—contact us for details. Please note that while this actuator enhances turbo performance, compatibility and maximum boost depend on your vehicle’s engine management system (OEM or aftermarket).

Standard diaphragm-sealed internals ensure reliable performance, but customers can also opt for piston-sealed internals—a Forge Motorsport exclusive. The piston design matches the diaphragm’s performance while offering greater durability and lower maintenance.

Important Note: Forge Motorsport and its authorized distributors cannot be held responsible for any issues arising from installation on vehicles with incompatible engine management systems. While our actuators can handle higher boost pressures than stock, we do not guarantee that your engine or supporting components can withstand increased stress.

Key Features:

• Adjustable spring rates to suit your setup

• Precision-machined from 6026-grade aluminum

• Vehicle- and turbo-specific design

• Handcrafted and polished in the UK

• Choice of diaphragm or piston operation (where applicable)

• Nomex-reinforced flurosilicone diaphragms for durability

• Laser-cut stainless steel brackets (where fitted)

• Optional tuning and service kits available

• Lifetime warranty

• Made in England

Package Includes:

• 1 × FMAC2SUB Actuator

• 1 × Forge sticker

Compatibility:

• Subaru (GDB) with IHI VF35/VF34 turbo

• Not suitable for Spec C models

Important Notes:

• Product design may vary due to ongoing improvements.

• Standard units include a factory-level spring. For higher boost (FMPACTUN tuning kit), select Diaphragm Type 2, 049 from the options.

• Listed pressure ratings indicate minimum regulated boost. Need guidance? Contact us for assistance.