Description

Performance Increase : (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 details: BMW Z4M Hybrid Airbox – Eventuri

Product details: BMW Z4M Hybrid Airbox – Eventurioyota GR Yaris | Eventuri

• • Product Details

Part Numbers:

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

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

FILTER HOUSING ASSEMBLY

The filter housing comprises of our bespoke generation 2 filter, aluminium inlet cowl, stainless steel bracket and the integrated MAF section. The carbon pod shrouds the reverse mounted filter and smoothly shapes the airflow down to the MAF section which then connects to the rear inlet tube. This changes the flow path from the OEM airbox where airflow enters the front of the airbox, changes direction by 90 degrees to travel through the panel filter and then changes direction again by 90 degrees to move through the MAF section. Our system is a lot more direct with airflow entering the front of the filter housing and and moving into the MAF section without any abrupt direction changes. The result is a smoother path from the filter to the turbo inlet tube and therefore the turbo is able to function with less drag.

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.

Bottom view of the airbox.

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.

Inlet side of the snorkel where the intake is connected.

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 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.

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

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

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.