Eventuri carbon intake system for BMW G29 Z4 M40i 2020+

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 while maintaining low intake temperatures. Heat and volume are the most important considerations when designing an intake system for turbocharged engines. On the G29 Z4, the intake system is located next to the exhaust manifold, which quickly heats up the engine compartment. 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 closed intake. However, this leads to a limitation with only one air supply from which air is sucked. During development we noticed an additional opening in the wheel arch area and took advantage of this by adding an additional duct in our air arch. In addition, our sealed airbox also features a gold reflection heat shield to minimize radiant heat transfer from the exhaust manifold. To maximize volume, we cut out the airbox as large as possible for potential strut braces. The stock pleated intake manifold has been replaced with a smooth carbon tube that also has a larger internal volume with an initial 111mm (4.4″) internal diameter 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 designed high flow dry filter that has been ISO tested for filtration performance and has a larger filtration area than the standard filter.

dyno check

Our intake for BMW G29 Z4 M40i was independently tested by AMS on a Supra (same engine) with downpipe and software. Tests were repeated the same day, with only the airbox swapped out for our intake. As can be seen, there is a power gain across much of the RPM range, with some ranges showing over 20hp gains. This is the result of restricting the intake path while maintaining low intake temperatures by maintaining a fully sealed system.

Another dyno test was done in the UK by Evolve Automotive with a downpipe and Stage 2 software tuning. This dyno diagram shows the difference between a fully stock Supra and then with the stock airbox, downpipe and stage 2 tuning and finally with the Eventuri, downpipe and stage 2 tuning a maximum power gain of 25hp. All runs were performed with the hood closed.

Each intake system consists of:

Dual feed carbon fiber airbox
Custom designed 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 backing
Laser cut stainless steel brackets
Silicon couplers with OEM specification clamps