Eventuri carbon intake for BMW G29 M40 I engine B58

Description

Performance gain: 17-20 hp, 15 Nm to 27 Nm

Compatibility: BMW G29 Z4 M40i

The Z4 B58 Eventuri intake was developed to provide the turbo with a less restrictive flow path whilst maintaining low intake temperatures. Heat and volume are the primary considerations when designing an intake for turbocharged engines. In the Z4 the intake system is located next to the exhaust manifold which quickly heats up the engine bay. High temperatures are detrimental to engine performance as the turbo would have to create boost with heated and less dense air and therefore the only way to ensure IATs are minimised is to have a fully sealed intake. However this does result in restriction with only one stock air supply to draw air in. During development we noticed an additional opening in the wheel arch area and took advantage of this by adding a secondary supply to our airbox. In addition our sealed airbox also features a heat shield with gold highlights to minimise radiative heat transfer from the exhaust manifold. In order to maximize volume, we made the airbox as large as possible with a recess for possible strut spacers. The stock convoluted intake tube is replaced with a smooth carbon tube that is also larger in internal volume with a starting internal diameter of 111mm (4,4″) tapering gradually to match the turbo inlet. The tube provides a smooth path from the filter to the turbo inlet. Finally, we use a custom-made high-flow dry filter that is ISO tested for filtration performance and has a larger filtration area than the stock filter.