Description

Eventuri Carbon Fibre Hybrid Airbox for E46 M3.

The Eventuri E46 M3 Hybrid Airbox System comes in 2 configurations, with and without the Eventuri intake. Eventuri 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 Fibre Main Airbox
• Carbon Fibre Airbox Snorkel with MAF tube
• Thermoplastic Moulded Trumpets with Stainless Steel Reinforcement Rings
• Carbon Fibre Filter Housing
• Bespoke Dry High Flow Filter
• Carbon Fibre Cold Air Scoop
• Stainless Steel Brackets and Flanges
• CNC Machined Breather Adapters
• Custom EPDM Flexible Coupler
• Silicon Couplers
• Crankcase Breather Hose
• Additional Vacuum Tubing

MAIN AIRBOX ASSEMBLY

The Main airbox section houses the 6 trumpets as well as the breather system connectors. Made from prepreg carbon fibre, 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 fibre reinforced thermoplastic. The injection moulding process ensures accuracy while keeping the inside surfaces smooth for airflow. This was more advantageous over making each one in carbon fibre as Eventuri can ensure perfect form for each trumpet with an accuracy not attainable with carbon. Eventuri 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.

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.

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.

DYNO TESTING

This intake has been independently dyno tested by Dream Automotive in the UK. Tests were done back to back against the stock airbox and several runs were taken with each configuration. The dyno results show a consistent gain throughout the RPM range which can be attributed to the smoother pathway through the intake and airbox to the throttle bodies. The performance gain translates on the road to increased part throttle and full throttle response with the car pulling much more eagerly to the redline.