C5 is based on an entirely new platform with a wheelbase of 2,750 mm.
The design meets the most stringent crash-test requirements and reduces
vibration without increasing weight.
front end comprises two cantrails with built-in crumple zones, attached
to two shock absorbers, and a cross-beam manufactured from
very-high-elastic-limit (VHEL) sheet steel. Around the passenger
compartment, the subframe and the windscreen pillars are designed to
absorb and dissipate energy towards the rear of the vehicle. The lower
front pillar trim is made of VHEL sheet steel.
the centre of the vehicle, a roll cage provides effective protection
against side impact. The roll cage consists of the central pillars,
reinforced over their entire height, connected at the top by a roof
cross-member and resting on the side members at their base.
The floor pan is essentially flat, providing increased leg room and comfort for the passenger in the central rear seat.
the rear, the floor of the boot is recessed to take the spare wheel.
Like the front end, the rear end is fitted with a cross-beam and two
cross-beams and shock absorbers dissipate kinetic energy in the event
of collisions at high speed, and reduce the cost of repairs following
minor collisions. Taking into account
the easy replacement of under-bonnet components, this limits the repair time for “Thatcham” type collisions (15 km/h).
under static torsion, in which torque of 1,000 Nm is applied between
the front and rear axles, is 0.8 milliradians.
excellent result can be attributed largely to the reinforced front and
rear pillars, the floor cross-members and the central roll cage. This
high stiffness contributes to the excellent road holding of the C5 and
the longevity of the body.
under dynamic torsion is 40 Hz, indicating excellent vibration
characteristics. Road noise and vibration are considerably reduced.
body shell weighs 293 kg unfinished and 463 kg with all doors and
opening panels. The total weight of the body shell has been reduced
notably by adapting the steel thickness and grade to individual
components, and by making widespread use of aluminium. For example, the
bonnet is 7 kg lighter than a similar design in steel.The use of bonded
welding techniques to assembly the body panels to the substructure has
brought a weight saving of 3 kg while maintaining excellent stiffness
and endurance. Finally, the use of stamping blanks of varying
thicknesses avoids the need for local reinforcement, thereby saving an
additional 1.5 kg.
C5 sells with a 12-year anti-corrosion warranty and a 3-year paintwork
warranty. The result of many years of testing, this warranty is based
on feedback and extensive in-the-field observation of vehicle ageing in
everyday use and under static exposure to saline environments. Overall,
94 % of the body shell by weight (including opening panels) is