EVENTURI CARBON-FIBRE INTAKE SYSTEM FOR 991 TURBO/TURBO S

The Eventuri 991 Turbo carbon-fibre intake system was developed through extensive realworld testing with the aim of allowing the host 911’s turbochargers to work more efficiently. By replacing the single stock airbox with individual patented Venturi filter housings, each snailshaped bhp booster is able to spool with less drag. As a result, wastegate duty cycles are lowered, delivering peak boost at lower rpm and, therefore, a welcome increase in performance, sharper throttle response and valuable reductions in sprint times.

The filter housings comprise bespoke air filters, aluminium inlet cowls, carbon pods and integrated tubes. The carbon pods shroud the reverse-mounted filters and smoothly shape airflow down to the stock turbo inlet tubes. By separating the inlet path and having a dedicated filter for each turbo in this way, the intake allows the turbos to function more efficiently. Crucially, the Venturi housings organically extend with a smooth curve from the filter opening to the stock turbo tubing. This ensures airflow remains as smooth as possible throughout the system.

Each filter housing features a smooth reduction in cross-sectional area at the point they shroud the filters and taper down to the tubing. This geometry invokes the Venturi effect, whereby airflow accelerates whilst maintaining laminar conditions. In many respects, it can be thought of as a large velocity stack. These bespoke filters aid the airflow moving through the housings and allow for an even velocity profile at the point air exits them.

Crafted from 100% prepreg carbon-fibre, the intake duct seals against the underside of the boot-lid using the stock rubber cushion, extending down to seal against the filter housings. Only ambient air is pulled, with no interference from hot air in the engine bay.

Again, in order to maximise flow efficiency, the transition from the circular openings of the filter housings to the single air entry point is as smooth as possible. The duct also features twin drain tubes, which direct water away from the filters. The complex geometry of the duct was necessary to clear the various components in a 991 Turbo’s engine bay. Meanwhile, the brackets are laser-cut from stainless steel and powdercoated for a strong, durable finish. Eventuri went to great lengths to ensure the intakes are a direct fit using the stock airbox mounting points. The brackets not only brace the intakes to the chassis, but also allow standard engine components to be secured in the very same way they would be with the stock airbox in place. In order to save weight, each bracket has purposely shaped cut-outs removing material, yet allowing the overall structure to remain rigid.

Price £2,040 design911.co.uk or call 0208 500 8811