1991 Audi S2 vs. 2007 Audi S4
To start off, 2007 Audi S4 is newer by 16 year(s). Which means there will be less support and parts availability for 1991 Audi S2. In addition, the cost of maintenance, including insurance, on 1991 Audi S2 would be higher. At 4,163 cc (8 cylinders), 2007 Audi S4 is equipped with a bigger engine. In terms of performance, 2007 Audi S4 (340 HP @ 7000 RPM) has 124 more horse power than 1991 Audi S2. (216 HP @ 5900 RPM) In normal driving conditions, 2007 Audi S4 should accelerate faster than 1991 Audi S2. With that said, vehicle weight also plays an important factor in acceleration. 2007 Audi S4 weights approximately 240 kg more than 1991 Audi S2. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Both vehicles are four wheel drive (4WD) - it offers better handling, traction, and control in all driving conditions compared with front wheel drive or rear wheel drive vehicles. 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, 2007 Audi S4 (410 Nm @ 3500 RPM) has 101 more torque (in Nm) than 1991 Audi S2. (309 Nm @ 1950 RPM). This means 2007 Audi S4 will have an easier job in driving up hills or pulling heavy equipment than 1991 Audi S2.
Compare all specifications:
| 1991 Audi S2 | 2007 Audi S4 | |
| Make | Audi | Audi |
| Model | S2 | S4 |
| Year Released | 1991 | 2007 |
| Engine Position | Front | Front |
| Engine Size | 2226 cc | 4163 cc |
| Engine Cylinders | 5 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Horse Power | 216 HP | 340 HP |
| Engine RPM | 5900 RPM | 7000 RPM |
| Torque | 309 Nm | 410 Nm |
| Torque RPM | 1950 RPM | 3500 RPM |
| Engine Bore Size | 81.1 mm | 84.5 mm |
| Engine Stroke Size | 86.4 mm | 92.8 mm |
| Acceleration 0-100mph | 6.1 seconds | 5.6 seconds |
| Drive Type | 4WD | 4WD |
| Transmission Type | Manual | Manual |
| Number of Seats | 4 seats | 5 seats |
| Number of Doors | 2 doors | 4 doors |
| Vehicle Weight | 1420 kg | 1660 kg |
| Vehicle Length | 4410 mm | 4590 mm |
| Vehicle Width | 1720 mm | 1780 mm |
| Vehicle Height | 1380 mm | 1430 mm |
| Wheelbase Size | 2560 mm | 2650 mm |
| Fuel Consumption Overall | 8.3 L/100km | 13.3 L/100km |
| Fuel Tank Capacity | 70 L | 63 L |
