Product Information
A machined aluminium replacement for the Bosch plastic diaphragm diverter valve. The factory valve’s rubber diaphragm splits over time and causes a boost leak. The FMDV008 swaps it for a piston design that holds boost, responds faster and can be rebuilt rather than binned.
Replaces OEM part numbers: 06A145710N, 06A145710P, 0 280 142 114, 4441895 (Saab)
Why fit one
- Sharper throttle response and less turbo lag
- Holds boost where a worn OEM diaphragm leaks
- Higher flow and faster response than the Bosch valve
- Piston sealed with heat-stabilised Viton O-rings, lubricated with high-temperature Mobil 1 grease
- No engine management light when fitted correctly
- Fully serviceable in minutes with the FMDVSK service kit
- Compact enough to fit under the engine cover
- Covered by the Forge Lifetime Warranty (see Warranty tab)
Forge heritage
Forge first replaced the Bosch plastic valve with an aluminium piston design over 20 years ago (the original FMCL007P). It became one of the most copied valves on the market. The FMDV008 is the latest development of that design.
Fitting the right way round
Boost from the turbo goes into the side port. The bottom port vents back to the intake. The 6mm top port connects to your existing vacuum line (supplied pipe is 6mm OD / 3.5mm ID, suits 4mm ID vacuum hose).
⭐ 10/10, replacement for my stock 1.8t mk4 Golf DV, build quality is over the top ⭐
⭐ Great bit of kit, well made, easy to service ⭐
⭐ I bought the FMDV008 and the quality is outstanding from the packaging to the product itself, really is a piece of quality kit, easily fitted with the simple instructions included…. and it really does improve the performance ⭐
By using the associated service kit (FMDVSK), as seen below, the life of the valve can be extended, and the performance can be maintained. With a lifetime guarantee, you can be sure the valve is reliable for your car.
It is fully customisable to fit your application with two uprated springs provided in the kit. Forge Motorsport’s improvement on the original valve has a compact design, meaning easy fitment under the engine cover. The valve is assembled with a 25mm side pipe, and the vacuum port on the top of the valve is 6mm in size
In The Box:
1 x FMDV008 Valve
1 x Uprated Yellow Spring
1 x Uprated Blue Spring
1 x Cable Tie
1 x 2.5mm Allen key
2 x 35mm Hose Clamps
1 x Instruction Booklet
1 x Forge Sticker
