The Forge 007 Diverter Valve (DV) is a popular upgrade for Volkswagen 1.8T engines, known for its performance and distinctive sound. But misinformation surrounding the Forge 007, particularly the splitter valve variant (FMDVSPLTR), often leads to confusion. This article clarifies the functionality and performance impact of the Forge 007 Dv, addressing common concerns and providing insights based on direct correspondence with Forge Motorsport.
Understanding Diverter Valves and the Forge 007
In turbocharged engines, a diverter valve (DV) manages excess boost pressure when the throttle plate closes. Unlike blow-off valves (BOVs) that vent this pressure to the atmosphere, DVs recirculate it back into the intake system. This is crucial for maintaining proper air/fuel ratios and preventing performance issues in metered airflow systems like the 1.8T.
The Forge 007 DV is engineered as a direct replacement for the factory DV, offering improved reliability and response. The FMDVSPLTR, a variant of the 007, provides a unique “splitter” functionality, venting a small portion of the pressure to atmosphere while primarily recirculating the majority. This creates a subtle “whoosh” sound reminiscent of a BOV, without compromising the performance benefits of a DV.
A Forge Motorsport 007 Diverter Valve
Addressing Concerns About the Forge FMDVSPLTR
A common misconception surrounding the FMDVSPLTR is that it vents a significant portion of metered air, leading to a richer air/fuel mixture and potential performance issues. Direct communication with Forge Motorsport clarifies this concern. According to Patrick Robles of Forge, the theoretical maximum atmospheric vent is around 17%, with real-world scenarios closer to 10%.
This minimal venting occurs when the throttle plate closes, and the volume of air in the intake tract is already minimal. Robles explains that the engine’s consumption of air under full throttle maintains a consistent boost pressure, despite any minor leakage from the splitter valve. Therefore, the small amount of vented air falls within the ECU’s compensatory parameters.
Graphs comparing performance with different Diverter Valves demonstrate minimal difference
Furthermore, Forge asserts that with proper spring adjustment, the FMDVSPLTR performs identically to the standard FMDV007 in terms of boost holding and venting efficiency. VAG-Com logs comparing both valves confirm this, showcasing no discernible difference in performance.
Spring Selection and Installation
The Forge 007 DV comes with different spring options to accommodate various boost levels. While spring choice is not overly critical, selecting the appropriate spring ensures optimal valve operation. For stock or lightly modified 1.8Ts, the included spring is usually sufficient. However, for heavily modified engines with higher boost pressures, a stiffer spring may be necessary.
Different Spring options for Forge 007 Diverter Valves cater to various boost levels.
Consulting Forge’s documentation or contacting their support team can help determine the ideal spring for your specific application.
Conclusion: The Forge 007 DV – Performance and Sound
The Forge 007 DV, including the FMDVSPLTR, provides a reliable and performant upgrade for Volkswagen 1.8T engines. Concerns regarding the splitter valve’s atmospheric venting are unfounded, as the amount is negligible and within the ECU’s adaptive capabilities.
By choosing the correct spring and ensuring proper installation, the Forge 007 DV delivers improved response and reliability, potentially enhancing the driving experience without sacrificing performance. The FMDVSPLTR offers the added benefit of a unique sound, appealing to those seeking a subtle auditory enhancement. Ultimately, the Forge 007 DV offers a compelling blend of performance and personalization for the discerning 1.8T enthusiast.
