After Peugeot, Citroën is revealing info about its hybrid air powered concept, the C4 Cactus AIRFLOW 2L concept.

The air-powered vehicle devised by Peugeot’s sister company will be unveiled at the Paris Motor Show and of course shares some aspects of its technology with Peugeot’s hybrid-air concept mentioned earlier this week.

Described by Citroën as a laboratory for new ideas, the C4 Cactus AIRFLOW 2L delivers fuel consumption of 2 liters per100 kilometers (over 141mpg imperial).

Citroën achieved this by improving aerodynamics by 20 percent, by using lower rolling resistance “tall & narrow” tires, by reducing overall vehicle weight by 100 kilograms and, of course, the integration of its Hybrid Air technology, which is said to cut fuel consumption by 30 percent.

The C4 Cactus AIRFLOW 2L project was undertaken by Citroën as part of the “2l/100 km vehicle” program set up by the Plateforme de la Filière Automobile industry group in France. The objective is to reduce the impact of vehicle running costs on household expenditure and to reduce the eco-footprint of car travel.

Citroën decided to integrate this hybrid-air technology in one of its newest vehicles, the C4 Cactus.

With engines and technologies selected to reduce vehicle weight, the production C4 Cactus already boasts a range of features designed to reduce fuel consumption, said Citroën. With the C4 Cactus AIRFLOW 2L concept, the French company said it is taking this approach even further.

Citroën has released the following list of modifications it has done to the C4 Cactus to create the hybrid-air concept:

Variable-geometry components:

  • The new front bumper features three air intakes that continuously adjust in accordance with vehicle use, both for engine cooling and to regulate air flow
  • Mobile side deflectors have been added to effectively guide the air flow around the vehicle
  • The wheels feature mobile shutters activated and controlled by centrifugal force

Fixed-geometry components:

  • New generation 19-inch “ultra ultra” low rolling resistance “tall & narrow” tyres. Their design improves both energy efficiency and aerodynamics. The large diameter also means they are better able to soak up bumps and dips in the road surface
  • The wheel arches feature an “Air Curtain”. This is achieved with small aerodynamic slats on either end of the front bumper to channel the air along the wheels
  • The spoiler has been lengthened and an air extractor has been added on the rear bumper in order to reduce the turbulence that can increase drag
  • The conventional door mirrors have been replaced by smaller, slimmer rearview cameras to reduce the impact on air flow
  • The vehicle sub-structure has been entirely streamlined so the air flows smoothly underneath the car
  • LED light modules at the front and rear replace the existing lights. Consuming little power, these new modules save energy and benefit fuel economy

To help the public identify what has been improved, Citroën said the changes can be identified by the color of the components and by the materials used. The color orange identifies all the aerodynamic features and underlines the high-tech character of the C4 Cactus AIRFLOW 2L concept.


Powertrain-wise, the C4 Cactus AIRFLOW 2L concept adopts the Hybrid Air drivetrain presented by the PSA Peugeot Citroën Group in January 2013, and featured on a Citroën C3 at the 2013 Geneva Motor Show.

This technology combines a range of proven sub-systems and technologies. This includes a 3-cylinder PureTech gasoline engine, a compressed air energy storage unit, a hydraulic pump/motor unit and an automatic transmission with an epicyclic gear train. Citroën added an intelligent electronic management system manages input from the driver to optimize energy efficiency.