Eventuri Carbon intake for BMW G29 Z4 M40i 2020+

Eventuri carbon intake for BMW G29 Z4 M40i 2020+

Performance Gain: 17-20hp, 11-20ft-lb

The MK5 Supra Eventuri intake has been developed to provide the turbo with a less restrictive flow path whilst maintaining low inlet temperatures. Heat and Volume are the main considerations when designing an intake for turbocharged engines. In the BMW G29 Z4 M40i 2020+ the intake system is located next to the exhaust manifold which rapidly heat soaks the engine bay. High temperatures are detrimental for engine performance as the turbo would have to build boost with heated, less dense air and so the only way to ensure IAT’s are kept to a minimum is for a fully sealed intake. This however, results in a restriction with only one stock air feed to draw air in from. During development we noticed an additional opening into the wheel arch area and took advantage of this by adding a secondary feed to our airbox. Furthermore our sealed airbox also has a heat shield with gold reflective to minimise the radiative heat transfer from the exhaust manifold. In order to maximise volume we made the airbox as large as possible with a recess for potential strut braces. The stock convoluted intake tube is replaced with a smooth carbon tube which is also larger in internal volume with a starting internal diameter of 111mm (4.4?) smoothly tapering down 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 which is ISO tested for filtration performance and has a larger filtration area than the stock filter.

Dyno Testing

Our intake has been independently tested by AMS on a Supra (same engine) with downpipe and tune. The tests were done back to back on the same day with only the airbox being changed for our intake system. As can be seen there is a performance gain for a large portion of the RPM range with some areas showing over 20hp gain. This is the result of derestricting the inlet path while maintaining low inlet temperatures by keeping a fully sealed system.

Another dyno test was carried out in the UK by Evolve Automotive with a downpipe and stage 2 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 and a max. of 25hp gain. All runs were conducted with the hood closed.

Each intake system consists of:

Carbon Fiber Airbox with Dual Feeds
Bespoke High Flow Dry Cone Filter
Carbon Fiber Inlet Tube with 111mm opening ID
CNC Machined Temperature Sensor Mount
CNC Machined Breather adapter
Heat Shield with Gold Reflective Backing
Laser Cut Stainless Steel Brackets
Silicon Coupler with OEM Specification Clamps