the 4C has a compact, powerful design that forms a tight, aerodynamic envelope for the engineering inside. The chassis is a carbon fiber structure with front and rear aluminum crash boxes, plus a hybrid steel and aluminum rear structure. Altogether, this produces a car with a strong downforce coefficient for stability at high speed.
This stability is important because the Alfa Romeo 4C weighs in at less than 850 kg (1874 lb), giving it a power to weight ratio in the supercar class of 4 kg/hp.
Inside the 4 m (13.1 ft) long 4C is a 4-cylinder, 1.75-liter engine currently found in the Quadrifoglio Verde version of the Giulietta. It has direct fuel injection, dual continuous variable valve timing, a turbocharger and a scavenging control system to remove any turbo lag. It puts out 237 bhp (178 Nm) for a top speed of 250 km/h (155 mph) and accelerates from 0 to 100 km/h (62 mph) in under five seconds.
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