Eventuri BMW E46 M3 Hybrid Carbon Airbox without Full Carbon Intake

The Eventuri Difference

Performance increase = 10-15hp, 8-12ft-lb

The E46 M3 intake system is a result of extensive data logging, dyno testing and design optimisation. Our aim was to develop an intake system for the S54 engine which worked with the stock ECU map and MAF sensor and produced a genuine improvement in the driving experience.

The E46 M3 Eventuri system uses our Patent Pending Carbon fibre Housing which provides an aerodynamically efficient airflow path from the filter to the MAF tube. Not just another cone filter with a heat shield but a unique design which invokes the Venturi affect. You can read more about the housing design.

The Eventuri E46 M3 Hybrid Airbox System comes in 2 configurations, with and without the Eventuri intake. We are offering the airbox without the intake to allow existing E46 M3 owners with Eventuri intakes to be able to reuse their filter housing and scoop. The Hybrid Airbox system consists of a number of components engineered to perform a specific purpose and fabricated to the highest of standards. Here are the details for each component and the design ethos behind them:

The full Hybrid Airbox with intake configuration consists of:

✓ Carbon Fiber Main Airbox
✓ Carbon Fiber Airbox Snorkel with MAF tube
✓ Thermoplastic Molded Trumpets with Stainless Steel Reinforcement Rings
✓ Carbon Fiber Filter Housing
✓ Bespoke Dry High Flow Filter
✓ Carbon Fiber Cold Air Scoop
✓ Stainless Steel Brackets and Flanges
✓ CNC Machined Breather Adapters
✓ Custom EPDM Flexible Coupler
✓ Silicon Couplers
✓ Crankcase Breather Hose
✓ Additional Vacuum Tubing

COMPLETE PACKAGE

We are providing all the parts required to install the airbox and get the car on the road. Usually with CSL style airboxes, there are additional parts required such as the ECU tune and breather pipes. Since our airbox uses the OEM MAF Sensor, there is no need for an aftermarket tune and we also provide the breather hoses. Here is a cost breakdown of additional parts required for CSL style airboxes. The only part required would be the SMG reservoir relocation kit.

MAIN AIRBOX ASSEMBLY

The Main airbox section houses the 6 trumpets as well as the breather system connectors. Made from prepreg carbon fiber, the airbox has been designed to resonate under load and produce the sought after CSL sound. One of the challenges of the construction was to ensure the long-term reliability of the interface between the trumpets and the airbox. This was resolved by using mechanical fasteners and gaskets to ensure an airtight seal which would not be affected by heat cycles and vibrations. A similar method was also used for the breather adapters.

The trumpets have been made with a glass fiber reinforced thermoplastic. The injection molding process ensures accuracy while keeping the inside surfaces smooth for airflow. This was more advantageous over making each one in carbon fiber as we can ensure perfect form for each trumpet with an accuracy not attainable with carbon. We also added CNC machined stainless steel rings to the trumpets to ensure that they do not deform when the silicon couplers are tightened onto them.

AIRBOX SNORKEL

The snorkel or lid of the airbox smoothly channels airflow from the intake to the trumpet area. This section also incorporates the MAF tube section where the OEM sensor is secured to a CNC machined MAF boss. The snorkel secures to the main airbox section using custom made screws which cut into plastic securing clips ensuring that they do not come loose under vibration.

CFD OPTIMISED

The overall shape of the airbox was optimised over several iterations using CFD simulations to ensure the trumpets had adequate flow without suffering from starvation due to restrictions in geometry or turbulence.

INTAKE HOUSING ASSEMBLY

The filter housing comprises of our bespoke generation 2 filter, stainless steel bracket and the carbon fiber housing. The carbon pod shrouds the reverse mounted filter and smoothly shapes the airflow down to the plenum. This is a key feature of the intake design where we have removed the tortuous flow path of the OEM airbox and therefore reduced the pressure loss through the whole system. This also ensures that the airflow is smooth when entering the MAF tube section of the airbox to allow the sensor to operate without errors.

PATENTED TECHNOLOGY

Our patented filter housings have a smooth reduction in cross sectional area as they shroud the filters and taper down to the tubing. This geometry invokes the Venturi effect where the airflow accelerates whilst maintaining laminar conditions. It can be thought of as a large velocity stack - below is a diagram to show the comparison between our patented design and a regular intake system. Our bespoke filters aid the airflow moving through the housings and allow for an even velocity profile as the airflow exits the housings. Further details can be read in the Technology and Filters pages.

COLD AIR SCOOP

100% Prepreg carbon fibre with a CNC machined collar - the air scoop forces ambient air directly into the filter opening. This scoop simply clicks into place in the front right hand brake duct and effectively saturates the mouth of the intake with cold air. It has been designed to take up half the height of the duct in order to allow airflow to still continue through the duct for the brakes. The scoop is so effective that even after a hard drive, the aluminium cowl at the mouth of the intake will still feel cold to touch.

FULL ASSEMBLY