Forge Motorsport RS Valve
The Forge Motorsport RS Valve is a high-performance valve designed to offer exceptional flow rate capability, making it ideal for engines that have been tuned with larger turbos or software upgrades. With a 50mm (2″) bore, this valve provides improved turbo response and increased internal mass air flow compared to other valves on the market.
Featuring a variable spring preload and a ratchet type top adjuster, the Forge RS Valve allows for precise adjustment to suit your driving style. The 360-degree adjustable vacuum hose connector ensures easy installation, while the choice of inlet and outlet connections allows for perfect matching to your engine.
The RS Valve incorporates a unique conical, progressive rate spring that can retain boost pressure from 7 to 22 PSI, depending on your application and level of adjustment. If you plan on running over 22psi, the uprated spring included in the kit is necessary.
Unlike other valves with cylindrical springs and adjustable pre-load, the Forge RS Valve’s spring design allows for unrestricted piston travel and flow volume, regardless of the amount of pre-load adjustment. This ensures optimal performance within the normal range of valve adjustment.
It’s important to note that when configured as a Dual-Piston Atmospheric Valve, the Forge Motorsport RS Valve is designed to vent 100% of the residual charge air to the atmosphere at throttle lift. While efforts have been made to ensure compatibility with mass air-flow sensor equipped vehicles, it’s not guaranteed for all applications. Please consult your engine management system’s capability to compensate for the loss of metered air before installing this valve.
The Forge Motorsport RS Valve comes with an uprated RS spring, an uprated yellow spring, a blanking plug (25mm or 34mm), instructions, and a Forge sticker. Choose your desired valve finish and hose connector diameter when ordering.
At Progressive Parts, we offer fitting services for the Forge Motorsport RS Valve at our performance workshop. Contact us for more information or to schedule an appointment.



