Developed specifically for BMW’s N54 twin turbo motor, as found in the 2007-2010 BMW 335i & 335xi (E90/E92/E93), 2008-2010 135i, 2011-2012 335is, 2011 1M Coupe (E82), and 2008-2010 535i and 535xi models. While virtually identical in operation to the Bosch style valves used from the factory on many other turbocharged applications, BMW has utilized a very different type of valve connection mechanism that makes their product and our replacement components very unique. Starting with the best selling direct replacement Bosch style valve, Forge Motorsport's own 007P piston-based design, they have revised virtually every single component of the valve body -- except the internal piston -- in order to retain the unique BMW connection mechanism yet offer improved functionality in every other possible way.
The entire valve assembly is precision CNC machined from T6-6061 billet aluminum alloy on Mazak CNC milling machines. The valve is an aluminum piston based design with significantly improved reliability over the failure prone OEM diaphragm valves, with no change to valve response time. Sparing no expense, these valves use ultra high temperature Viton brand silicone o-rings for sealing and Mobil1 fully synthetic bearing grease for lubrication. The valves are fully tunable for both boost holding capacity and response, by way of proprietary interchangeable springs and shims (washers to marginally adjust preload). Using this method of valve tuning with multiple custom spring rates, the valves will retain the maximum range of piston travel and flow volume regardless of which spring rate is used. Valves with a singular spring requiring that adjustments be made by continually adding preload will suffer from decreased piston or diaphragm travel as the spring tension is increased. Though these types of valves may hold high boost levels under load, they will actually suffer from limited flow volume at throttle lift when the valve vents.
The hoses included in the kit are a custom made multi-layer fabric reinforced flexible silicone hose that are designed to allow compatibility with the stock airbox and charge piping setup without any permanent modification being required to adapt the upgraded valves. Even the included hose clamps are overkill. They're specifically designed for use with silicone hoses, utilizing a beveled band edge and a pressed in drive mechanism rather than perforated. They are even approved by NATO for international military use.
With all this in mind, this direct replacement N54 recirculation valve kit will be suitable for a bone stock 135i/335i/535i or one that is very heavily modified. They will last well past having upgraded your intake, exhaust, and ECU software. They are capable of handling an infinitely wider range of boost pressure more reliably than the OEM N54 valves.
In The Box:
- 2 x FMDVBM35 Valve (Left and Right)
- 1 x 25mm x 400mm Mega Flex Hose
- 1 x 25mm x 330mm Mega Flex Hose
- 4 x 40mm Hose Clamps
- 2 x Uprated Yellow Spring
- 1 x Forge Sticker
E82 / E88 (08-13) > 135i
E82 / E88 (08-13) > 135is
E82 / E88 (08-13) > 1M (11-12)3 Series
E90 / E91 / E92 / E93 (06-13) > 335i
E90 / E91 / E92 / E93 (06-13) > 335is
E90 / E91 / E92 / E93 (06-13) > 335xi5 Series
E60 / E61 (04-10) > 535i
E60 / E61 (04-10) > 535xi