OEM T9357 Diverter Valve for BMW N20 Engine Vehicle New

solution couldn’t be simpler – keep what works and replace what doesn’t

Retains the factory solenoid coil for seamless integration

Replaes plastic valve parts with metal for reliability and strength on chipped engines

Exclusive “pilot-actuated” valve mechanism for rapid response at high boost

The solenoid coil itself from the factory-fitted valve is great (the ECU opens it faster than any pneumatic valve so why replace it?), but the weak point however is the valve mechanism itself. So solves this problem by replacing just the valve parts with an anodised billet aluminium housing fitted with a brass piston machined to exacting tolerances.

Other manufacturers’ products involve replacing the entire system with a traditional pneumatic valve, requiring long vacuum hose runs, additional parts for tapping into the intake manifold vacuum, plus either a different solenoid valve to actuate the pneumatic valve or a ballast resistor to plug into the OE wiring loom. All these additional items result in a product that is slower, less responsive, more expensive and takes much longer to install.

Many late-model European cars use ECU controlled solenoid-type diverter valves. This is a good concept because the valve can react very quickly and it only opens when it needs to.

However, there are some problems with these valves. There are typically two types of solenoid-actuated diverter valves found standard on VAG and European cars, both of which have their shortcomings...

Common OE Problem #1:

The diaphragm types are commonly known to rupture, especially when boost and temperature are increased as a result of chip tuning.

Common OE Problem #2:

The plastic piston-type leaks far more than most people realise (by design, not from wear), and doesn’t always close after a high-boost gear shift.

Additionally, in both cases, the solenoid on the OE diverter is directly connected to the valve mechanism, which is not ideal because neither it nor the return spring are strong enough to open and close the valve reliably at high boost.

With problems like this, you can see why other aftermarket manufacturers assume the best solution is to replace the factory diverter entirely. Unfortunately though, whilst their replacement kits might be stronger than the factory diverter, their slower response speed and lower flow do not justify the extra cost and complexity – more of a compromise than a solution.

The addresses the factory valve problems with a very simple and elegant solution. Keeping the factory solenoid retains all the benefits of the stock system, and replacing the valve parts with indestructable metal components ensures strength and reliability no matter how much boost you run.

That’s not all. Rather than using the solenoid to directly actuate the valve, we’ve introduced a unique “pilot-actuation” system. This means the solenoid controls the air pressure that is used to open and close the piston, so it doesn’t matter how much boost you push through it, the will open and close reliably without ever exceeding the solenoid’s capability.

This feature also improves on the factory system by opening the valve progressively in response to boost pressure, so it only opens as much as required to get the job done (the factory valve simply opens and shuts, it cannot partially open if boost pressure is low), resulting in better throttle response..

MANUFACTURER PART #T9357

Condition:   Brand New, Never Used or Installed

Fitment: 

Note: Access To The Factory Diverter Is Extremely Tight. Installation Of The Usually Requires Loosening Of The Turbo Manifold To Gain Access To The Diverter Valve.

2011-2015 for BMW X1 SDrive20i/XDrive20i/XDrive28i E84 (N20 Engine)  

2011-2016 for BMW 520i/528i F10/F11/F07 (N20 Engine)

2011-2016 for BMW Z4 SDrive18i/SDrive20i/SDrive28i E89 (N20 Engine) 

2011-2017 for BMW X3 SDrive20i/XDrive20i/XDrive28i F25 (N20 Engine)

2012-2016 for BMW 320i/328i F30/31/34/35 (N20 Engine)

2014-2016 for BMW 220i/228i F22 (N20 Engine)     

2013-2016 for BMW 420i/428i F32/33/36 (N20 Engine)   

2014-2017 for BMW X4 Xdrive20i/XDrive28i F26 (N20 Engine) 

2015-2018 for BMW M2 F87 (N55B30T0 Engine)