Forge Pop-off valve FMDV008 bypass valve 25mm connection – silver

Forge Motorsport FMDV008 Recirculation Valve (25 mm) – Silver

Technical Description of the Closed Bypass Valve

Forge Motorsport’s FMDV008 was developed as a robust upgrade to the vulnerable, factory-installed plastic diaphragm valves. Especially in tuned turbocharged engines, the original component quickly reaches its limits due to increased boost pressure, leading to leaks and a loss of power.

Function and Performance: As a closed (recirculating) system, this valve precisely recirculates excess charge air back into the intake tract upstream of the turbocharger when the throttle valve closes—for example, during gear changes. Thanks to its construction as a durable aluminum piston valve, it guarantees maximum pressure stability and reliability. Since the air remains in the circuit, there are no measurement errors in vehicles equipped with an air mass sensor (AMS). Rough engine operation, RPM fluctuations, or error codes in the engine control unit are now a thing of the past.

Technical Specifications

• Brand: Forge Motorsport

• Model / Type: FMDV008 (Closed-Piston Sliding Bypass Valve)

• Connection diameter: 25 mm

• Construction: Housing and piston made entirely of aluminum

• Finish: Silver anodized

• Installation: Simple plug & play replacement for the OEM component

• Fine-Tuning: Custom adjustment to the specific boost pressure using various tuning springs:

  • Yellow spring: Optimized for boost pressures from 1.00 to 1.59 bar

  • Blue spring: Optimized for boost pressures from 1.59 to 2.07 bar

  • Red spring (accessory): For high-boost applications starting at 2.07 bar (available as an option)

Package Contents

• 1x Forge FMDV008 recirculation valve (25 mm, color: silver)

• 1x Spring Set for Custom Pressure Adjustment (includes the yellow and blue springs)