Honda Civic FL5 Type R

Performance Increase : 14hp, 15ft-lb

The Honda FL5 intake is the culmination of iterating our FK8 system to provide an optimised solution, taking advantage of the increased space in the FL5 engine bay. By maintaining a sealed airbox we have minimised heat soak to ensure a constant supply of cold air to the turbo. Since the intake sits directly behind the radiator it is crucial that the filter is not exposed which would result in heated air being drawn into the turbo.

We have also replaced the OEM flexible intake hose, which creates turbulence and therefore increases drag. With the FL5 Intake, we’ve engineered a seamless path from the filter to the inlet tube, eliminating drag and smoothing the airflow. Engine movement is now catered for by the inlet tube itself, which can move within the airbox whilst maintaining a seal against heat.

Our carbon airbox has been designed to maximise the use of the available volume and minimised heat ingress. The resulting performance gains and aesthetics are industry leading for the FL5 Type R.

Components

The Eventuri FL5 Type R intake system consists of a number of components engineered to perform a specific purpose and fabricated to the highest of standards. Here are the details for each component and the design ethos behind them: 

Each intake system consists of: 

• Prepreg Carbon Fibre Airbox Enclosure
• Custom High Flow Air Filter ISO Tested
• Carbon Venturi stack with integrated MAF tube
• Full Silicon Joiner with Breather Inlets
• Laser Cut Bracket Work

Carbon Airbox Enclosure 

The FL5 airbox has been designed to make the most effective use of the volume in the engine bay. It shields the filter from the multiple sources of heat, the most direct being the radiator and fan which pushes a stream of hot air directly into the intake area. The other significant heat sources are the turbo and downpipe which sit next to the intake area and once the engine is up to operating temperatures, the engine bay becomes quickly heat soaked. All these heat sources require a complete airbox system as shielding in order to maintain low intake air temperatures. 

Carbon Venturi Tube 

To connect our cone filter to the stock turbo pipe, we designed a tube with an integrated MAF sensor mount and an Venturi stack matched to the inner diameter of the filter neck. This curvature allows the airflow to remain laminar as it goes through the filter and enters the tubing. This replaces the stock flexible rubber tube which has several deep ridges and creates turbulence in the flow path. To maintain a degree of flexibility - the tube is independent of the airbox enclosure and is able to move within the airbox, which relieves any stresses from the engine movements. The Eventuri tube design results in an aerodynamically efficient flow path from the filter to the turbo allowing the turbo to generate boost more effectively and reduce lag.

Flow Simulation 

As part of our R&D process we carry out flow simulations through our intake systems to ensure that our initial concepts and calculations are reasonable. The simulation also helps us to further optimise the system for smoother airflow where possible. 

The flow simulation through a single tube shows an increase in velocity from the filter to the outlet - which is expected as the cross sectional area reduces. It also shows the smooth transition between the filter and tube with the Venturi stack allowing the airflow to narrow down while remaining laminar in nature.

Compatibility

Honda Civic FL5 Type R

Warranty

One Year Eventuri Warranty

Manufactured by

Eventuri

Part Number

EVE-FL5-CF-INT