C4 BioFlex: technological advance for real results
C4 BioFlex powertrain was designed and developed to run on normal
unleaded fuel (RON 95 or 98), on bioethanol with up to 85% ethanol
content (E85), and on a mix of the two containing between 0 and 85%
Developing the C4 BioFlex required work in two
key areas. First, all components and parts had to tolerate contact with
ethanol. Second, the engine had to function optimally regardless of the
proportion of alcohol in the fuel.
Imported from Brazil,
the engine features several modifications already applied to engines
used locally, mainly concerning parts that come into contact with the
fuel, such as rings and valve seats.
were also made to the fuel circulation system, involving the tank, fuel
gauge and pump module, pipes and fuel filter.
the engine software has been adapted to include new settings that
adjust automatically to the alcohol content in the fuel. Each time the
tank is filled, an analysis is made of alcohol content in order to
select the best operating curve. During the analysis, the engine
functions with “protection” settings compatible with all authorised
fuel blends containing between 0 and 85% ethanol content.
has been boosted in E85 mode, with maximum power of 82 kW (or 113 bhp
DIN, compared with 80 kW/110 bhp DIN) still at 5,800 rpm – for a 2.5%
improvement – and maximum engine torque of 153 Nm (up from 147 Nm),
still at 4,000 rpm, for a 4% improvement.
Running on standard unleaded fuel (SP95), the engine performs practically identically to the 1.6i 16V version.
adaptation is completely transparent for the customer, apart from the
maintenance plan, with services every 20,000 km for the French market.