Forge Twin Piston Blow Off Valve with Side Vacuum Nipple
An atmospheric dump/blow off valve suitable for most turbo cars with an air flow meter. Made from billet aluminium, this atmospheric diverter valve dumps the charge-air to atmosphere creating the ‘whoosh’ sound commonly associated with rally cars when the throttle is lifted. This increases both throttle response and higher clamping load to maintain boost pressure more reliably.
Unlike single piston or diaphragm diverter valves, this uses counter balanced springs and dual pistons to prevent the valve from leaking air into the intake system at idle. This prevents our diverter valves suffering any of the failures associated with single piston and diaphragm type diverter valves.
This version of Forge’s popular FMDV004 valve has the vacuum connection on the side of the valve, ideal for applications where space is restricted.
All Forge Motorsport Dual-Piston Atmospheric Valves have been designed and built with the intent of venting 100% of the residual charge air remaining in your forced induction system to the atmosphere at throttle lift.
While we have incorporated many elements into the design of the Dual-Piston valves to aid in their compatibility with mass air-flow sensor equipped vehicles, we cannot always guarantee that each individual’s application will be compatible with a valve that vents the charge air into the atmosphere.
Owen Developments and Forge Motorsport cannot assume any responsibility for any adverse effects resulting from the installation of this valve onto a vehicle whose engine management system, whether factory or aftermarket, is not capable of compensating for the loss of metered air through a vent-to-atmosphere valve such as this.