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Body shell

The 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.
The 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.
At 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.
At 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 shock absorbers.
The 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).
Stiffness under static torsion, in which torque of 1,000 Nm is applied between the front and rear axles, is 0.8 milliradians. 
This 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.
Stiffness under dynamic torsion is 40 Hz, indicating excellent vibration characteristics. Road noise and vibration are considerably reduced.
The 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.
The 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 galvanised.

© 2000 Julian Marsh/CitroŽnŽt/SA Automobiles CitroŽn