BMW Z4M Hybrid Airbox

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Performance Increase with OEM ECU tune (E46 M3 figures): 20-22hp, 8-13ft-lb

Presenting a World first – the Eventuri Hybrid Airbox System, a breakthrough intake solution for the BMW E85 Z4M. This system delivers the aggressive, race-inspired sound of the CSL Airbox with the seamless driveability and plug-and-play simplicity of a traditional intake. Until now, Z4M owners wanting the CSL airbox sound had to compromise on running the engine without the MAF sensor, often leading to expensive ECU conversions or remaps, where throttle response and driveability were negatively affected. Our Hybrid Airbox solves this problem and delivers the sound and power of a CSL airbox without the need for a remap, as well as the driveability and smooth performance delivery of a regular intake.

The Eventuri Difference

The airbox uses our Patented Venturi Carbon Fiber Housing which provides an aerodynamically efficient airflow path. Not just another cone filter with a heat shield but a unique design which invokes the Venturi affect and maintains laminar flow conditions to reduce the drag on the engine. You can read more about the housing design and how it works HERE.

Performance

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DYNO TESTING

(E46 M3 Airbox results shown) 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.

Product Details

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Part Numbers:

EVE-Z4MABX-CF-INT : BMW Z4M Hybrid Carbon Airbox with Full Carbon Intake

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The Eventuri Z4M Hybrid Airbox System comes with everything you need for a full plug and play experience. The airbox, intake and breather tubes. Unlike our E46 M3 version, we could not reuse the existing Z4M intake due to the positioning of the airbox in the engine bay and so we had to redesign the intake to allow fitment.

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
Cold Air Scoop
Stainless Steel Brackets and Flanges
CNC Machined Breather Adapters
Custom EPDM Flexible Coupler
Silicon Couplers
Crankcase Breather Hose
Additional Vacuum Tubing

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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.

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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.

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The trumpets have been made with thermoplastic. The manufacturing 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.

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Bottom view of the airbox.

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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.

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Inlet side of the snorkel where the intake is connected.

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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.

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Flow pulses through each trumpet.

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INTAKE HOUSING ASSEMBLY

The filter housing comprises of our bespoke generation 2 filter, stainless steel bracket and the Patented Venturi 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.

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Front view of the intake housing. This housing was custom designed specifically to allow the carbon airbox to be fitted to the Z4M.

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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.

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COLD AIR SCOOP

The air scoop forces ambient air directly into the filter opening. This scoop simply clicks into place behind the front grill and effectively saturates the mouth of the intake with cold air. 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.

Video

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Installation Guide

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Please download the installation guide here.

E46 M3 Airbox Guide

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BMW Z4M Hybrid Airbox

Performance

Product Details

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Installation Guide

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