GFB DV+ Diverter Valve - VW & Audi 1.8T/2.0T/2.5T (EA113 & EA888)

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The GFB DV+ T9351 rebuilds the factory electronic diverter valve on VW and Audi 1.8T, 2.0T and 2.5T engines with parts that last: an anodized billet aluminum housing and a machined brass piston in place of the failure-prone plastic factory internals. The factory solenoid coil stays, so the ECU keeps full control of the valve, installation stays simple, and operation stays quiet and fully recirculating. The factory diverter valve is one of the most common wear points on these engines, and it rarely fails loudly. It leaks, boost tapers at high RPM, and the turbo works harder to compensate. Whether your car is stock or tuned, the DV+ holds the boost your turbo is already making, sharpens throttle response and takes a known failure point out of the car for good. Important Compatibility Information Designed for the earlier factory valve: the T9351 rebuilds the 3-screw factory diverter valve used in revisions C, D and G, which mounts on the turbo compressor housing on most applications. EA888 EVO4 vehicles use a newer valve: the 2022+ MK8 and MK8.5 GTI, Golf R and other EVO4 cars use a sealed factory valve that cannot be rebuilt, and GFB covers those with the complete-replacement DV+ linked below. Why Upgrade the Factory Diverter Valve? The factory valve opens by dragging its plastic piston directly with the solenoid, and those actuating forces are weak. Sealing ranges from average to poor even when the valve is new, and the diaphragm-style revisions tend to tear outright on tuned engines. Any leak is boost the engine never sees, and the ECU responds by driving the turbo harder, which adds backpressure and heat. Boost holding: GFB rates the DV+ to seal properly at up to 50 psi. Durability: billet aluminum and brass replace the plastic parts that crack, tear and stick, and the all-metal internals are unaffected by heat. Throttle response: the valve opens progressively and only when there is boost to vent, so boost recovers faster after a shift or a brief lift. How the DV+ Works Instead of asking the factory solenoid to muscle the valve open, the DV+ uses it as a pilot: the solenoid meters charge pressure to the back of the piston, and pressure does the heavy lifting. With the solenoid off, boost acts on both sides of the piston, and because the sealing area on the back of the piston is about 25% larger by GFB's published figures, the valve is always held shut harder than boost pushes it open. It cannot be forced open by boost pressure alone. When the ECU triggers the solenoid, the pressure behind the piston is relieved and the valve opens, venting back into the intake exactly as the factory system does. The result is reliable actuation at boost levels the factory mechanism was never built for, with no vacuum lines, no ballast resistors and no extra wiring. Sport and Standard Configurations The DV+ installs in two configurations. With the main spring fitted, the valve opens and closes progressively in response to boost pressure, which is the best setup for throttle response and boost recovery between gears. Because this behavior differs from the factory valve, some cars produce a slightly different intake sound on low-RPM lift-off, and some ECUs record diagnostic code P2261. The code does not indicate a fault and causes no harm to the turbo or engine. Installed without the main spring, the DV+ behaves exactly like the factory valve, just stronger, better sealed and longer lasting. If you prefer completely stock behavior with none of the factory weak points, run it without the spring. What's Included Anodized billet aluminum DV+ valve housing Machined brass piston with elastomer seal Main piston spring Pilot plunger and plunger spring Longer mounting bolts (x3) Installation instructions Reused from your vehicle: the factory solenoid coil and its yellow o-ring. No other factory parts carry over. Installation Notes Installs in the factory location with basic hand tools: unplug the connector, remove the factory valve, transfer the GFB internals onto the factory solenoid and refit with the supplied longer bolts. No wiring, vacuum lines or software changes are required. The factory valve sits on the turbo compressor housing on most cars; on some, such as the Mk6 Golf R, it mounts remotely at the front of the engine bay. Handle the brass piston carefully and never drop it. Even invisible damage can cause boost leaks or sticking. On US-market Passat models with the EA888 Gen 3 engine, the factory valve is buried deep in the engine bay, so plan for a more involved installation. Follow the official GFB DV+ T9351 installation instructions and confirm your vehicle appears in this listing's fitment before ordering. Product Specifications Manufacturer: GFB (Go Fast Bits) Product: DV+ diverter valve SKU: G004 T9351 MPN: T9351 Valve type: Recirculating electronic diverter valve Actuation: Pilot actuation through the factory solenoid coil Housing: Anodized billet aluminum Piston: Machined brass with elastomer seal Boost capability: Seals to 50 psi, GFB-published Configurations: With main spring (Sport) or without (Standard) Replaces: Factory electronic diverter valve, revisions C, D and G Need a Different GFB Valve? GFB builds a valve for nearly every VW and Audi turbo platform: 2022+ MK8/MK8.5 GTI and Golf R (EA888 EVO4): GFB DV+ Diverter Valve for the MK8 and MK8.5 Older 1.8T, 2.7T and 4.2T engines (MK4, MK1 Beetle, B5/B6/C5, 8N): GFB DV+ Diverter Valve for 1.8T, 2.7T and 4.2T Limited clearance above the factory valve: GFB DV+ low-profile Diverter Valve Adjustable blow-off sound on MQB platforms: GFB DVX Diverter Valve Vent-to-atmosphere sound for the Mk7/Mk7.5 GTI and 8V S3: GFB VTA Blow Off Valve Vent-to-atmosphere sound for early TSI/TFSI engines with the Pierburg-style factory valve: GFB VTA Blow Off Valve for early TSI/TFSI Not sure which valve your car needs? Contact your BMP Tuning rep and we will confirm the right part before you order. Frequently Asked Questions Will the DV+ make blow-off sounds?No. The DV+ is a recirculating valve, so vented air returns to the intake and the quiet factory character stays. With the main spring fitted you may notice a slightly different intake sound on low-RPM lift-off. If you want audible venting, choose one of the vent-to-atmosphere GFB valves listed above. Do I need a tune to run the DV+?No. The valve runs from the factory solenoid and ECU signal on stock and tuned cars alike. It is a popular supporting upgrade for tuned cars, where holding boost consistently matters even more. Will the DV+ increase my boost or power?It will not create boost the turbo is not already making. If your factory valve seals well, peak boost stays the same. If it leaks, and many do, expect boost held further toward redline, and with a significant leak, higher peak boost as well. Should I install it with or without the main spring?Use the main spring for the sharpest throttle response and fastest boost recovery. Leave it out if you want behavior identical to the factory valve with better sealing and durability, or if your ECU logs code P2261 in the sprung configuration and that bothers you. Does the T9351 fit the 2022+ MK8 GTI or Golf R?No. EA888 EVO4 vehicles use a newer sealed factory valve, and GFB covers them with the complete-replacement MK8 DV+ linked above. How do I know my factory diverter valve is failing?Common signs are boost that tapers off at high RPM, slow recovery between gears and inconsistent peak boost. Factory valves often leak without setting a fault code, so a tired valve can go unnoticed for a long time. Show more