Forge Motorsport Recirculation/Diverter (DV) Valve Kit FMDVF20R for BMW 135i/235i N55 3.0 Turbo (F20)

Turbo Bypass Valve Upgrade for BMW N55 3.0 F20 - Part FMDVF20R

Part Number: FMDVF20R

Give your N55-powered BMW 135i or 235i the boost control it deserves. The Forge Motorsport FMDVF20R piston-style recirculating assembly replaces the fragile factory electronically controlled unit with a robust, serviceable solution that keeps charge pressure where it should be. Expect rock-solid boost retention, sharper throttle response, and OEM-smooth drivability with none of the unwanted noise.

Proven upgrade for tuned and stock cars

• Billet aluminium, piston-operated design for leak-free performance and long-term reliability
• Retains ECU management while using a vacuum and pressure referenced piston for consistent control under high load
• Quiet, recirculating operation for daily use; the ideal alternative to a vent-to-atmosphere setup
• Perfect companion for Stage 1 and Stage 2 software, hybrid turbos, or spirited road use where the stock plastic assembly can struggle
• Addresses common issues such as boost bleed, premature opening, and breakage on removal of the OE unit

This direct-fit compressor bypass solution is designed to hold boost more effectively than the standard electronic diverter, helping reduce surge and improving mid-range punch. It is a smart reliability and performance enhancement for any N55 single-turbo 3.0 petrol application within the F20 platform.

Vehicle suitability

For BMW 135i and 235i with the N55 3.0 turbo engine in F20 applications that use an electronically actuated bypass from the factory. Ideal for both unmodified vehicles seeking durability and remapped cars demanding stronger boost control.

What you get in the box

• 1 x FMDVF20R Valve
• 1 x 3000 mm of 4 mm Vacuum Tube
• 1 x 100 mm of 6 mm Vacuum Tube
• 1 x 50 mm of 6 mm Vacuum Tube
• 1 x Solenoid, Bracket, and Screws
• 10 x Cable Ties
• 1 x Uprated Blue Spring
• 1 x 8-4-8 T Piece
• 1 x Forge USB Instructions
• 1 x Forge Keyring and Sticker

A separate spring tuning pack is available if you wish to fine-tune response for specific setups.

Why enthusiasts choose this upgrade

• Stronger boost holding than the stock electronic bypass valve
• Smoother part-throttle behaviour and faster boost recovery between shifts
• Serviceable construction for long-term peace of mind
• Direct replacement with factory-like integration and no unwanted CEL illumination

Fitting and support

Professional installation recommended. MJ Modifications offers supply and fitting in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Tried and trusted by our team

We have installed this unit on numerous customer cars and our own vehicles. Feedback is consistently positive, with owners reporting steadier boost, improved reliability versus the OE assembly, and quiet OEM-like operation that suits daily driving and performance use alike.

Search-friendly details

FMDVF20R turbocharger bypass valve kit for BMW 135i 235i N55 3.0 F20. Also searched as DV upgrade, recirc DV, compressor bypass, turbo pressure relief valve, charge air valve, dump valve replacement, boost control valve, plug-and-play OE replacement, billet aluminium piston valve for tuned N55 engines, boost leak fix, throttle response upgrade.