2005 Audi S4 vs. 1971 Citroen SM
To start off, 2005 Audi S4 is newer by 34 year(s). Which means there will be less support and parts availability for 1971 Citroen SM. In addition, the cost of maintenance, including insurance, on 1971 Citroen SM would be higher. At 4,161 cc (8 cylinders), 2005 Audi S4 is equipped with a bigger engine. In terms of performance, 2005 Audi S4 (340 HP @ 6300 RPM) has 182 more horse power than 1971 Citroen SM. (158 HP @ 5500 RPM). In normal driving conditions, 2005 Audi S4 should accelerate faster than 1971 Citroen SM. With that said, vehicle weight also plays an important factor in acceleration. 2005 Audi S4 weights approximately 390 kg more than 1971 Citroen SM. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Let's talk about torque, 2005 Audi S4 (410 Nm) has 175 more torque (in Nm) than 1971 Citroen SM. (235 Nm). This means 2005 Audi S4 will have an easier job in driving up hills or pulling heavy equipment than 1971 Citroen SM.
Compare all specifications:
| 2005 Audi S4 | 1971 Citroen SM | |
| Make | Audi | Citroen |
| Model | S4 | SM |
| Year Released | 2005 | 1971 |
| Body Type | Convertible | Coupe |
| Engine Position | Front | Front |
| Engine Size | 4161 cc | 2670 cc |
| Engine Cylinders | 8 cylinders | 6 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 5 valves | 2 valves |
| Horse Power | 340 HP | 158 HP |
| Engine RPM | 6300 RPM | 5500 RPM |
| Torque | 410 Nm | 235 Nm |
| Engine Bore Size | 85 mm | 87 mm |
| Engine Stroke Size | 93 mm | 75 mm |
| Number of Seats | 4 seats | 4 seats |
| Number of Doors | 2 doors | 2 doors |
| Vehicle Weight | 1840 kg | 1450 kg |
| Vehicle Length | 4580 mm | 4900 mm |
| Vehicle Width | 1780 mm | 1850 mm |
| Vehicle Height | 1400 mm | 1330 mm |
| Wheelbase Size | 2660 mm | 2950 mm |
| Fuel Tank Capacity | 63 L | 89 L |
