The 991 Turbo Eventuri intake system was developed through extensive real world testing with the aim of allowing the turbos to work more efficiently. By replacing the single stock airbox with individual patented Venturi filter housings, the turbos are able to spool and generate boost with less drag. As a result, the wastegate duty cycles are reduced resulting in peak boost at lower RPM and therefore performance is increased. The two individual filters provide a larger filtration area as compared to the single stock panel filter. Furthermore, in order to keep inlet air temperatures down, the Venturi housings are sealed against an air duct which draws ambient air from the same location as the stock system. Since the 911 Turbo engine bay is densely packed, high IATs can only be avoided by ensuring a fully sealed intake system. The combination of a smoother airflow path to each turbo with low IATs results in higher performance and a sharper throttle response over the stock airbox.
Each intake system consists of:
- 2 x Carbon Fiber Venturi Housings with Integrated Tubes
- 2 x Bespoke High Flow Generation 2 Filters
- 2 x Aluminium Inlet Cowls
- Carbon Fiber inlet duct
- Laser Cut Stainless Steel bracket work
The intake duct seals against the underside of the boot-lid using the stock rubber cushion and then extends down to seal against the filter housings. Crafted from 100% prepreg carbon fiber the intake duct ensures that the intake pulls in ambient air only and not heated engine bay air. Again in order to maximize flow efficiency the transition from the circular openings for the filter housings to the single air entry point is as smooth as possible. The duct also features 2 drain tubes which direct water away from the filters. The tubes are designed such that the intakes will draw a minimum amount of air from within the engine bay due to the larger flow resistance in the tubes as compared to the opening at the top of the duct. The complex geometry of the duct is necessary to clear the various components in the engine bay of the 991 Turbo.
The brackets are laser cut from stainless steel and powder coated. We went to great lengths to ensure that the intakes have a precision fitment using the stock airbox mounting locations. The brackets not only brace the intakes to the chassis but also allow engine components to be secured as they are with the stock airbox. In order to save weight, each bracket has purposely shaped cutouts which remove material yet allow the overall structure to remain rigid.
The Eventuri Difference
The 911 Turbo Eventuri system uses their Patented Carbon Fibre Housings with our Gen 2 bespoke filters, which provide an aerodynamically efficient airflow path from the filter to the turbos. Not just another cone filter with a heat shield but a unique design which invokes the Venturi affect and maintains laminar flow conditions to reduce the drag on the turbo.
The intake was tested on the road using a Vbox unit to record the acceleration from 60-130mph . 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 – on stock software, the acceleration times from 60-130mph reduced by 0.2 seconds which is a significant improvement at such speeds.
Acceleration results summary:
60-130mph with Stock intake = 8.04 seconds
60-130mph with Eventuri intake = 7.83 seconds
The gains are from a combination of reasons:
1) Individual Venturi Housings separate the flow path for each turbo allowing them to work more efficiently.
2) The Venturi housings provide a smooth transition from the filter to the intake tubes keeping airflow laminar.
3) Intake air temperatures are kept to a minimum by ensuring a sealed system to prevent pulling in heated engine bay air.
ABOUT EVENTURI: Eventuri was founded by a team of engineers and enthusiasts with a background in Aeronautics and tuning – all sharing a passion for cars and performance. Eventuri Intakes are extensively developed using cutting edge design, testing and prototyping methods. With a focus on performance, each design undergoes CFD analysis and is then validated at the prototype stage through volumetric airflow, intake temperature and extensive dynamometer testing. We strive to publish all the development information to illustrate the depths we go to in bringing an intake from concept to reality. After many years of disappointment with the usual aftermarket intakes, Eventuri are proud to be raising the bar and creating intake systems which are setting a new standard and genuinely improve performance.