Presenting an intake which truly sets a benchmark for the BMW G8X M3/M4 platform. We have carried out intensive R&D to develop an intake which not only improves on the stock M3/M4 but also is future proof in its capacity to cater for high powered builds well in excess of 1000hp. Our system is a complete redesign from the airboxes to the turbo inlets with the aim of reducing pressure loss while increasing the flow rate and keeping inlet temperatures low. We have maximised the usage of the available space to employ 2 custom made filters with a 40% larger filtration area than stock. These are used in our Patented Venturi housings to smoothly funnel the air to the turbo inlets. The inlets themselves are up to 160% larger in cross sectional area than stock and are designed with an advanced dimpled inner surface to reduce frictional losses between the flow and the wall boundary. By allowing a “cushion” of air at the wall surface, airflow is able to move through the inlets at higher flow rates with reduced pressure loss. This allows the turbos to draw air with less resistance and therefore reduce the wastegate duty cycle resulting in higher overall performance.

The Eventuri G8X M3/M4 intake system consists of a number of components engineered to perform a specific purpose and fabricated to the highest of standards. We use 100% pre-preg carbon fibre with no fibreglass which means we can achieve a smooth internal surface to maintain smoother airflow.

This intake has been independently dyno tested by BR Performance in Belgium. Tests were done back to back against the stock airbox and several runs were taken with each configuration. The car tested was without charcoal filters. We took the best results from the stock airbox and the best from the Eventuri system. The dyno results show a consistent gain throughout the RPM range which can be attributed to the turbos reaching peak boost earlier and with a lower wastegate duty cycle due to the higher efficiency of the intake system. This gain is despite the dyno cell temperatures rising from 11.8 deg C for the stock system tests to almost 16 deg C for the Eventuri tests. 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.

Turbo charged cars can build up a lot of engine bay heat which can be detrimental to performance if the intake system is not sealed against it. Even with intercoolers and charge coolers, it is important to minimise Inlet Air Temperatures (IATs) as these cooling devices work with an efficiency ratio so the output air temperature is affected by the input air temperature. Derestricting the intake by using open cones, even if heat shielded will inevitably pull in hot air from the engine bay. Our system being fully sealed solves this problem while still derestricting the flow path using bigger volumes. To demonstrate, we data logged air temperatures using thermocouples just before each turbo. Comparisons were taken between stock and Eventuri on the same day with the same ambient conditions. Our M3 was allowed to heat soak and then it was accelerated from 30mph to 90mph in 6th gear to measure the change in temperature across each run. At 90mph, throttle was released and brakes were applied to 30mph at which point the car accelerated again to 90mph. A total of 3 pulls were made with both intake configurations.

In order to achieve the highest flow rate possible we designed a new filter element to make as much use of the space available in the engine bay as possible. This new filter has an outside diameter of 192mm or 7.6″ and when flow tested with a housing using a 4″ opening is able to flow up to 900 CFM at 28″ H2O. The filter medium is ISO tested to ensure that filtration is in line with OEM standards and is also dry. The filter is constructed with our signature flow cones to aid in the Venturi housing principle.

Our patented filter housing has a smooth reduction in cross sectional area as it shrouds the filter and tapers 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.

The biggest restriction in the stock system are the turbo inlets. The G8X M3/M4 has an inlet for each turbo and we were able to significantly increase the sizes of both of them. By increasing their sizes, the turbos are able to pull in air with less restriction hence allowing for a quicker spool. In the following photos you can see the differences in the sizes. Although the benefit may be small for a stock car, we expect these larger inlets to be more beneficial for higher states of tune where the target boost pressures are increased.

We could have finalised the designs here however, we wanted to push the boundaries further and introduce a novel dimpled pattern to the inside surfaces. In theory, small dimples can increase the flow rate by reducing the frictional pressure losses through a tube.

A lot of R&D went into simulating different sizes and shapes until we settled on an optimised version which demonstrated a higher flow rate through the inlets in comparison with a smooth surface. Applying such an intricate was only possible due to the advanced manufacturing technique we employed to make the inlets, where traditional methods would not have given the accuracy required. The dimples create an “air cushion” affect over the surface of the inlet which then allows the main body of air to “slip” with less friction through the body into the turbo. This results in a more even velocity profile in a dimpled tube with the net affect being a higher velocity for the same boundary conditions.

2 x Carbon Fiber Patented Venturi Filter Housings
2 x Bespoke High Flow Dry Cone Filters
2 x Carbon Fiber Inlet Ducts
Carbon Fiber Intake Tube
2 Thermoplastic Turbo Inlets
Laser Cut Stainless Steel Brackets
Custom Flexible Hose
CNC Machined Bracket Mounts and Reinforcement Rings

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