The N54 diverter charge pipe is yet another part developmed directly from the Evolution Racewerks135i Time Attack racing program. The factory diverter valves were causing an issue of not being able to hold up against the rigors of high boost application, therefore they needed to be replaced. Thus attention was brought to the factory diverter valve pipe and the need to optimize for maximum performance on a race car facilitated the need for a new pipe to be built.
Often ignored, charged intake airflow characteristics greatly affect throttle response, turbo lag and ultimately maximum power potential. Smooth bends and minimal obstructions are ideal. This is not the case with the factory diverter valve pipe. On the factory diverter valve pipe features a sound baffle for the diverter valves. This sound baffle is connected on the side of the factory diverter valve pipe which splits airflow. This causes turbulence inside the pipe which slows the charge intake air velocity (speed of the air traveling inside the pipe). By removing this turbulence (by eliminating the factory diverter valve sound baffle), increased throttle response, decrease turbo lag and ultimately higher maximum power potential can be realized. Our Diverter Valve Pipe Upgrade eliminates this sound baffle and thus eliminating the unnecessary turbulence in the diverter valve pipe, keeping charge intake air velocity at it's maximum. 3" 6061 Aluminum piping was used to properly match the size of the throttle body as well.
Since one of the reasons for changing out the factory diverter valves was to prevent boost leaks (from prematurely opening on high boost), causing boost leaks while upgrading the diverter valve would be counterproductive. The connection at the throttle body was looked over very carefully. The factory diverter valve is connected to the throttle body using an o-ring inside the throttle body flange which is locked in place by a c-clip, which works very well. It also make removal/installation quick and easy. The throttle body lip is machined to accept this c-clip. It is not designed for a silicone hose connection which is used by all the other brand diverter valve pipe upgrades in the market. The throttle body lip is too short and there are no "beads" to prevent the silicone hose from blowing off under boost. Even though it is the easiest way to "rig" together, it is not ideal. The best way to connect the new diverter valve pipe to the throttle body is to replicate the same connection. Therefore, we CNC machined our own replica throttle body flange that utilizes the same factory o-ring and c-clip for our Diverter Valve Pipe Upgrade.
The same issue came with the MAP sensor. The MAP sensor seals to the factory diverter valve pipe via a o-ring on the sensor itself. Having a hole in a silicone hose will definitely cause a boost leak as it will not properly seal. Therefore, again we CNC machined our own replica MAP sensor flange that utilizes the same factory o-ring seal.
- Increase throttle response and decreases turbo lag
- Compatible with factory diverter valves or aftermarket factory style diverter valves
- Lightweight High Grade 6061 Aluminum Piping
- Throttle body matched 3" piping
- Retains factory style o-ring throttle body lock flange
- Precision CNC machined MAP sensor flange ensures leak free connection
- Diverter Valve Charge Pipe features beaded ends and T-bolt clamps to prevent intercooler piping from coming off from boost
- Factory diverter valve sound baffle, which causes turbulence in the factory pipe, is removed.
- Includes all hardware for complete installation
- Developed under the harsh conditions of racing on our 135i Race Car
- Limited Lifetime Warranty
BMW E60/E61 535i
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