Eventuri Carbon Intake E9X M3

[Imran@Evolve]

The BMW E9X M3 Eventuri intake system is the result of extensive research and optimisation which improves possibly one of the best designed stock intake systems we have seen. The E9X stock airbox system is a brilliantly designed intake with an excellent flow path and feed system for ambient air. However on closer inspection, there are restrictions in the inlet tube connecting the airbox to the inlet manifold. By redesigning the tube yet maintaining the airbox, we have been able to allow the V8 engine to breathe with greater efficiency and therefore gain power. In addition to the new tube design, we also identified a further restriction in the air feed system. To overcome this we designed a scoop to allow an increase in airflow through the airbox. This reduces inlet temperature values further and adds to the performance gain of the system.

Key Stats

Performance Gain Dyno: 8-10hp, 10-12ft-lb
Performance Gain Road Dyno (Insoric): 16hp, 14Nm
IAT Difference with Ambient: Stock 7.5C : Eventuri 4.5C
V-Box Acceleration : 100-200kph Reduced By 0.3 Seconds

Performance Gain Dyno: 8-10hp, 10-12ft-lb

Dyno tests were carried out showing a consistent gain of approximately 9hp and 11ft-lb of torque. The gain is not just at the peak but throughout the RPM range. This translates on the road to increased part throttle and full throttle response with the car pulling much more eagerly to the redline. The testing was done on the same day back-to-back and temperatures were monitored to ensure consistency. The car was tested firstly with the stock intake - hood closed. We then left the car on the dyno and installed the Eventuri. The car was then run again - hood closed. Several runs were carried out with both configurations to get a consistent result.



Performance Gain Road Dyno (Insoric): 16hp, 14Nm

The system was also tested using a road based measurement device (Insoric). On the road, the airflow is a lot better than the fan can achieve on the dyno and so the intake system is able to perform better. The following graph shows the difference the Eventuri intake makes on the road compared with the stock airbox. The measured gains were 16Hp and 14Nm : Solid lines show with the Eventuri and dashed lines are with stock airbox. Red line is power at the crank and blue line is at the wheels.



Data Logging Flow and Inlet Temperature

To monitor and record data output from the ECU we used a Bavarian Technic diagnostics tool. The car was fitted with the stock system and then data was logged in 4th gear to the redline. Then the Eventuri intake was fitted and the same method applied. The outputs show that the air mass flow with the Eventuri is higher across the entire RPM range - with a bigger difference at higher RPM where the restrictions in the stock system become more apparent. Furthermore the difference between the ambient temperature and the inlet air temperature (IAT) is also smaller with the Eventuri due to the scoop enabling a higher air speed through the airbox. Here are 2 screenshots of the data output, one at approximately 5000rpm and the other at approximately 8300rpm.

Data Logging summary:

5000rpm IAT difference with ambient: Stock intake = 9.6 Degrees C : Eventuri = 5.3 Degrees C

8300rpm IAT difference with ambient: Stock intake = 7.6 Degrees C : Eventuri = 4.7 Degrees C

5000rpm Air Mass Flow Rate: Stock intake = 635 kg/h : Eventuri = 650 kg/h

8300rpm Air Mass Flow Rate: Stock intake = 1168 kg/h : Eventuri = 1202 kg/h





Interactive datalog graph can be seen here:

https://datazap.me/u/evolve/e9x-m3-e...-1-2-3-4-5-6-7

VBox Acceleration Tests

We also took the car for some road testing using a Vbox unit to record the acceleration from 60-130mph (also 100-200Km/h). Testing was carried out on the same stretch of road - again on the same day to keep variables minimum. Results show that with just the intake added, the acceleration times from 60-130mph and also 100-200Km/h reduced by approximately 0.3 seconds which is a significant change at such speeds. The car was equipped with Evolve Stage 2 with primary decat and 99 RON fuel with and without the intake.

Acceleration results summary:

60-130mph with Stock intake = 11.157 seconds
60-130mph with Eventuri intake = 10.886 seconds
100-200Km/h with Stock intake = 9.56 seconds
100-200Km/h with Eventuri intake = 9.236 seconds









Product details



The Eventuri E9X M3 intake 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:

Each intake system consists of:
Carbon Fibre Intake Tube
High Flow Urethane Cone Filter
Carbon Fibre inlet Scoop
CNC Machined breather adapter
Laser Cut Stainless Steel Debris Guard
Silicon Coupler and OEM specification clamps

Carbon Intake Tube



CFD of Eventuri Intake Pipe

The intake tube was designed to improve the airflow path compared to the stock tube - from the filter to the manifold. It is a 1-piece design which has no internal interfaces and therefore provides a much smoother path for the airflow to negotiate. Furthermore the geometrical transition is from a circular opening for the filter to the oval exit for the manifold. This is a much more efficient change in shape when compared with the stock tube which has to transition from a rectangular opening for the filter to the oval exit for the manifold.

In order to appreciate the improvement in the design we must take a closer look at the stock system:



As can be seen - the stock intake tube has 2 concertina sections which are used to allow the tube some flexibility for engine movement. These sections introduce multiple internal interfaces to the oncoming airflow which results in turbulence and therefore a less efficient path for performance. The Eventuri tube on the other hand has zero internal interfaces and so airflow is allowed to stay laminar which allows the engine to breathe more efficiently.



Another drawback of the stock tube is the large internal face at the stock filter connection. This exposed wall causes airflow to circulate as it enters the tube from the filter due to the sharp change in geometry from the rectangular filter opening to the more oval tube shape.



Now this can be compared with our tube design which has a much more gradual change in shape from a circular opening at the filter end to the oval opening at the inlet manifold end:

Flexibility and Movement

An important challenge to overcome was the requirement of movement with the engine. Instead of using silicon couplers with flexible sections (which would introduce similar interfaces as the stock tube), we designed the tube itself to be able to move with the engine. The tube has a compressible neoprene band around the section which interfaces with the stock airbox. This section seals the tube to the airbox yet allows movement in and out of the airbox as the engine moves. By allowing the tube itself to move - we have been able to create a flow path which is as smooth as possible.





Carbon Air Scoop



The E9X M3 airbox system is saturated with cold air from 2 feeds : a lower feed from underneath the headlamp and an upper feed from behind the kidney grills. The primary feed is the lower one from underneath the headlamp as it connects directly to the airbox with minimal change of direction and a large opening to the airbox. This is also a high pressure area of the car and airflow moves through the airbox from underneath to the exit at the top connecting to the exit vent in the bonnet. The other feed from behind the kidney grills which, although is a welcome addition, provides a much lower volume of air to the airbox than the lower feed. This is because airflow has to change direction through 90 degrees twice and also because the duct narrows down significantly before the entry to the airbox.

Looking at the lower duct more closely, it becomes clear that the duct has a large ridge which comes back on itself just before the opening to the airbox. This acts as a barrier which inhibits direct entry of airflow to the box by reducing the entry speed of the airflow.



By designing a scoop to sit on top of the stock duct and curve up sooner to eliminate this ridge - airflow is now allowed to transition from the duct to the airbox without restriction.



The airflow path is much smoother and as a result, the velocity of the air entering the airbox significantly increases. This allows the intake temperatures to be lower than without the scoop : we have data logged IATs road where we managed to reduce intake air temperature by 2 degrees using the scoop. To illustrate the effectiveness of the scoop, we devised a simple experiment with a leaf blower to generate flow and an air speed meter to measure the speed of the air entering the airbox. We secured the blower in one position so that it pushed air directly into the lower duct and placed the meter inside the airbox to measure the speed coming in. Results showed a significant increase in speed of almost 50% when using the scoop.

Debris Shield

The final component is a debris shield attached to the filter - this deflects debris and water from impacting the filter directly. With the increase of airflow entering the airbox with the scoop - this is an important addition. There is no negative impact on performance since the airflow is not impeded through the airbox - temperatures are still lower than stock.

Please contact your preferred dealer/board vendor for pricing and orders.

[Evolve Automotive]

So awesome!

Message us if you are interested!

[elim11]

Nice pretty piece. Any CFD analysis done to compare stock vs your piece? Would be nice to see velocity air flow and pressure, etc.

Thanks!

[Imran@Evolve]

Originally Posted by elim11

Nice pretty piece. Any CFD analysis done to compare stock vs your piece? Would be nice to see velocity air flow and pressure, etc.

Thanks!

CFD of the Eventuri Intake Pipe added to the first post. We did not do this on the stock pipe as it was quite obvious what the restrictions were so no point modelling it for CFD.

The gains on dyno, vbox and data logs have proved out the theory anyhow.

[IND-Distribution]

Great write up!

Have a few in stock and they look amazing in person.

[Imran@Evolve]

Originally Posted by IND-Distribution

Great write up!

Have a few in stock and they look amazing in person.

Thank you sirs

[Brentis]

Wow. Rarely am I impressed by both the design and engineering of something. Love seeing the passion and supporting data. I suppose CF also helps prevent heat soak to some extent too.

Possibly getting rid of my M3. But really want this!

[buzz367]

Beautiful work as usual from Eventuri. I've been waiting for an e9x intake for quite a while. Maybe it took so long because the stock box is so efficient off the shelf?

Mods like this always make me think about BMW's development of these parts. Obviously the airbox is very efficient from factory, but simple changes like the scoop in the bumper intake duct must have been considered in development. Why did M decide to design it the way they did, with that reversed ridge?

On a separate note, is there any pressure leak around the neoprene band? Neoprene is not always air tight, especially when designed to move along a plastic surface like the stock airbox. Would love some more explanation there if possible.

[Imran@Evolve]

Originally Posted by buzz367

Beautiful work as usual from Eventuri. I've been waiting for an e9x intake for quite a while. Maybe it took so long because the stock box is so efficient off the shelf?

Mods like this always make me think about BMW's development of these parts. Obviously the airbox is very efficient from factory, but simple changes like the scoop in the bumper intake duct must have been considered in development. Why did M decide to design it the way they did, with that reversed ridge?

On a separate note, is there any pressure leak around the neoprene band? Neoprene is not always air tight, especially when designed to move along a plastic surface like the stock airbox. Would love some more explanation there if possible.

Yes it took so long as the stock airbox is just so good.

Look at the datalogs compared to stock. It has lower IAT and more airflow than stock. The stock airbox is not sealed anyway - it has a big opening near the hood.

[Browntrash]

is there a noticeable difference in sound?

[dj_dub]

I hope they end up selling the lower scoop separately like they do with the E46 M3 application...I'm definitely in to pick that up if the price isn't ridiculous.

[///MPower15]

Originally Posted by dj_dub

I hope they end up selling the lower scoop separately like they do with the E46 M3 application...I'm definitely in to pick that up if the price isn't ridiculous.

Red carbon lower scoop on your car

[GORDON.M3]

Is it possible to order the eventuri air duct separately?

[Imran@Evolve]

Originally Posted by gordon@

Is it possible to order the eventuri air duct separately?

This is not possible at present. The kits are being sold as complete systems.

[L4ces]

Originally Posted by Browntrash

is there a noticeable difference in sound?

Originally Posted by Browntrash

is there a noticeable difference in sound?

Anyone?

[Imran@Evolve]

Originally Posted by L4ces

Anyone?

The sound is slightly deeper under load. Sounds clips will be ready later today.

[Imran@Evolve]

Sound clips here: Sound Clips before and after Eventuri

[SYT_Shadow]

very interesting guys. It looks like a very high quality part for these cars!

[Imran@Evolve]

Originally Posted by SYT_Shadow

very interesting guys. It looks like a very high quality part for these cars!

We think so too. We've tried to include as much data as possible to show that it works and why.

[Artifacts in Motion]

Just having some data points and measurements on this piece is a huge sell. I've never been convinced on intake mods, but I'm curious regarding this one. Would love to do a blind test with the stock and Eventuri on one vehicle and see if the butt dyno can tell.

[buddalun]

Some questions:

1) Is the CF of the intake tube and the lower scoop a 2X2 weave or 1X1?
2) Does the Eventuri CF weave match the factory E92 M3 Carbon Fiber roof?
3) Can the sticker from the lower scoop be removed easily?
4) Can the Eventuri logo/plaque on the intake tube be removed without damaging the tube?

Thanks!

[Evolve Automotive]

Originally Posted by buddalun

Some questions:

1) Is the CF of the intake tube and the lower scoop a 2X2 weave or 1X1?
2) Does the Eventuri CF weave match the factory E92 M3 Carbon Fiber roof?
3) Can the sticker from the lower scoop be removed easily?
4) Can the Eventuri logo/plaque on the intake tube be removed without damaging the tube?

Thanks!

1) 2x2
2) Its 2x2 and the roof is 1x1
3) No it cannot as it is cleared over
4) It is riveted on and not designed to be removed.