1991 Audi S2 vs. 1971 Citroen SM
To start off, 1991 Audi S2 is newer by 20 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 2,670 cc (6 cylinders), 1971 Citroen SM is equipped with a bigger engine. In terms of performance, 1991 Audi S2 (216 HP @ 5900 RPM) has 58 more horse power than 1971 Citroen SM. (158 HP @ 5500 RPM). In normal driving conditions, 1991 Audi S2 should accelerate faster than 1971 Citroen SM. With that said, vehicle weight also plays an important factor in acceleration. 1971 Citroen SM weights approximately 30 kg more than 1991 Audi S2.
Because 1991 Audi S2 is four wheel drive (4WD), it will have significant more traction and grip than 1971 Citroen SM. In wet, icy, snow, or gravel driving conditions, 1991 Audi S2 will offer significantly more control. With that said, do keep in mind that many other factors such as speed and the wear on your tires can also have significant impact on traction and control. Let's talk about torque, 1991 Audi S2 (309 Nm @ 1950 RPM) has 74 more torque (in Nm) than 1971 Citroen SM. (235 Nm @ 4000 RPM). This means 1991 Audi S2 will have an easier job in driving up hills or pulling heavy equipment than 1971 Citroen SM.
Compare all specifications:
| 1991 Audi S2 | 1971 Citroen SM | |
| Make | Audi | Citroen |
| Model | S2 | SM |
| Year Released | 1991 | 1971 |
| Engine Position | Front | Front |
| Engine Size | 2226 cc | 2670 cc |
| Engine Cylinders | 5 cylinders | 6 cylinders |
| Engine Type | in-line | V |
| Horse Power | 216 HP | 158 HP |
| Engine RPM | 5900 RPM | 5500 RPM |
| Torque | 309 Nm | 235 Nm |
| Torque RPM | 1950 RPM | 4000 RPM |
| Engine Bore Size | 81.1 mm | 87 mm |
| Engine Stroke Size | 86.4 mm | 75 mm |
| Drive Type | 4WD | Front |
| Transmission Type | Manual | Manual |
| Number of Seats | 4 seats | 4 seats |
| Number of Doors | 2 doors | 2 doors |
| Vehicle Weight | 1420 kg | 1450 kg |
| Vehicle Length | 4410 mm | 4900 mm |
| Vehicle Width | 1720 mm | 1850 mm |
| Vehicle Height | 1380 mm | 1330 mm |
| Wheelbase Size | 2560 mm | 2950 mm |
| Fuel Tank Capacity | 70 L | 89 L |
