1981 BMW 745 vs. 2007 Audi S4
To start off, 2007 Audi S4 is newer by 26 year(s). Which means there will be less support and parts availability for 1981 BMW 745. In addition, the cost of maintenance, including insurance, on 1981 BMW 745 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 (339 HP @ 7000 RPM) has 87 more horse power than 1981 BMW 745. (252 HP @ 5200 RPM) In normal driving conditions, 2007 Audi S4 should accelerate faster than 1981 BMW 745. With that said, vehicle weight also plays an important factor in acceleration. 2007 Audi S4 weights approximately 145 kg more than 1981 BMW 745. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 2007 Audi S4 is four wheel drive (4WD), it will have significant more traction and grip than 1981 BMW 745. In wet, icy, snow, or gravel driving conditions, 2007 Audi S4 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, 2007 Audi S4 (410 Nm @ 3500 RPM) has 30 more torque (in Nm) than 1981 BMW 745. (380 Nm @ 2200 RPM). This means 2007 Audi S4 will have an easier job in driving up hills or pulling heavy equipment than 1981 BMW 745. 2007 Audi S4 has automatic transmission and 1981 BMW 745 has manual transmission. 1981 BMW 745 will offer better control over acceleration and deceleration in addition to better fuel efficiency overall. 2007 Audi S4 will be easier to drive especially in heavy traffic.
Compare all specifications:
| 1981 BMW 745 | 2007 Audi S4 | |
| Make | BMW | Audi |
| Model | 745 | S4 |
| Year Released | 1981 | 2007 |
| Body Type | Sedan | Sedan |
| Engine Position | Front | Front |
| Engine Size | 3430 cc | 4163 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Horse Power | 252 HP | 339 HP |
| Engine RPM | 5200 RPM | 7000 RPM |
| Torque | 380 Nm | 410 Nm |
| Torque RPM | 2200 RPM | 3500 RPM |
| Engine Bore Size | 92 mm | 84.5 mm |
| Engine Stroke Size | 86 mm | 92.8 mm |
| Engine Compression Ratio | 8.0:1 | 11.0:1 |
| Top Speed | 220 km/hour | 250 km/hour |
| Drive Type | Rear | 4WD |
| Transmission Type | Manual | Automatic |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 4 doors | 4 doors |
| Vehicle Weight | 1590 kg | 1735 kg |
| Vehicle Length | 4870 mm | 4580 mm |
| Vehicle Width | 1810 mm | 1790 mm |
| Vehicle Height | 1440 mm | 1420 mm |
| Wheelbase Size | 2800 mm | 2660 mm |
| Fuel Tank Capacity | 100 L | 63 L |
