Lotus E21 - 'FRIC' suspension system 11 May 2013
Hidden inside the E21's left sidepod is the hydraulic actuator (lower arrow) that controls the car's much-talked-about 'FRIC' (Front and Rear Inter-Connected) suspension system, which is understood to link the front and rear suspension hydraulically and can be adjusted in a similar way to the brake fluid. With this system there is a displacement of hydraulic fluid - the upper red arrow shows the fluid reservoir - from one end of the car to the other in order to help keep a constant ride height and aerodynamic balance. In the drawing we can also see the hydraulic pressure lines feeding in, moving the fluid between front and rear as required to adjust the car's pitch. The system, which Lotus started work on in 2011, is totally passive and hence legal.