2004 Audi S4 vs. 1981 Audi UR
To start off, 2004 Audi S4 is newer by 23 year(s). Which means there will be less support and parts availability for 1981 Audi UR. In addition, the cost of maintenance, including insurance, on 1981 Audi UR would be higher. At 4,172 cc (8 cylinders), 2004 Audi S4 is equipped with a bigger engine. In terms of performance, 2004 Audi S4 (339 HP @ 7000 RPM) has 142 more horse power than 1981 Audi UR. (197 HP @ 5500 RPM). In normal driving conditions, 2004 Audi S4 should accelerate faster than 1981 Audi UR. With that said, vehicle weight also plays an important factor in acceleration. 2004 Audi S4 weights approximately 470 kg more than 1981 Audi UR. 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, 2004 Audi S4 (410 Nm @ 3500 RPM) has 125 more torque (in Nm) than 1981 Audi UR. (285 Nm @ 3500 RPM). This means 2004 Audi S4 will have an easier job in driving up hills or pulling heavy equipment than 1981 Audi UR.
Compare all specifications:
| 2004 Audi S4 | 1981 Audi UR | |
| Make | Audi | Audi |
| Model | S4 | UR |
| Year Released | 2004 | 1981 |
| Engine Position | Front | Front |
| Engine Size | 4172 cc | 2144 cc |
| Engine Cylinders | 8 cylinders | 5 cylinders |
| Engine Type | V | in-line |
| Valves per Cylinder | 5 valves | 2 valves |
| Horse Power | 339 HP | 197 HP |
| Engine RPM | 7000 RPM | 5500 RPM |
| Torque | 410 Nm | 285 Nm |
| Torque RPM | 3500 RPM | 3500 RPM |
| Engine Bore Size | 84.5 mm | 79.5 mm |
| Engine Stroke Size | 92.8 mm | 86.4 mm |
| Engine Compression Ratio | 11.0:1 | 7.0:1 |
| Drive Type | 4WD | 4WD |
| Transmission Type | Manual | Manual |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 5 doors | 2 doors |
| Vehicle Weight | 1720 kg | 1250 kg |
| Vehicle Length | 4590 mm | 4430 mm |
| Vehicle Width | 1780 mm | 1690 mm |
| Vehicle Height | 1430 mm | 1360 mm |
| Wheelbase Size | 2470 mm | 2530 mm |
| Fuel Tank Capacity | 63 L | 70 L |
