Eventuri Carbon Intake System for BMW G29 Z4 M40i 2020+

Tailor-made carbon intake system / intake solution, for real power and torque increase for BMW E46 M3 from Eventuri

Eventuri intake for BMW G29 Z4 M40i

• Power increase: 17-25hp, 11-20ft-lb

The MK5 Supra Eventuri intake was designed to provide a less restrictive flow path for the turbo whilst maintaining low inlet temperatures. Heat and volume are the key considerations when designing an intake system for turbocharged engines. On the G29 Z4, the intake system is located next to the exhaust manifold which heats up the engine bay quickly. High temperatures are detrimental to engine performance as the turbo would need to be charged with heated, less dense air so the only way to keep IATs to a minimum is with a fully enclosed intake. However, this results in a restriction with only one air feed to draw air from. During development we noticed an additional opening in the wheel arch area and took advantage of this by adding an additional feed in our air box. In addition, our sealed airbox also features a gold reflection heat shield to minimise radiant heat transfer from the exhaust manifold. To maximize volume, we cut out the airbox as large as possible for potential strut bracing. The stock folded intake pipe was replaced with a smooth carbon pipe that also has a larger internal volume with an initial internal diameter of 111mm (4.4") and gently tapers to match the turbo inlet. The pipe provides a smooth path from the filter to the turbo inlet. Finally, we use a custom high flow dry filter that is ISO tested for filtration performance and has a larger filter area than the stock filter.

dyno test

Our BMW G29 Z4 M40i intake was independently tested by AMS on a Supra (same engine) with downpipe and software. The tests were repeated on the same day, only changing the airbox for our intake. As you can see, there is a power gain for a large portion of the rpm range, with some areas showing gains of over 20 hp. This is the result of derestricting the intake path while maintaining low intake temperatures by keeping a fully sealed system.

Another dyno test was carried out in the UK by Evolve Automotive using a downpipe and a Stage 2 software tune. This dyno graph shows the difference between a fully stock Supra and then with the stock airbox, downpipe and Stage 2 tune and finally with the Eventuri, downpipe and Stage 2 tune a maximum power gain of 25bhp. All runs were carried out with the hood closed.

Each intake system consists of:

• carbon fiber airbox with dual feed
• Custom-made high-flow dry cone filter
• carbon fiber inlet pipe with 111mm opening ID
• CNC-machined temperature sensor mount
• CNC machined vent adapter
• heat shield with reflective gold underlay
• Laser-cut stainless steel bracketsSilicon couplers with clamps according to OEM specifications