2009 Audi S4 vs. 1981 BMW 745
To start off, 2009 Audi S4 is newer by 28 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 4,161 cc (8 cylinders), 2009 Audi S4 is equipped with a bigger engine. In terms of performance, 2009 Audi S4 (340 HP @ 6800 RPM) has 88 more horse power than 1981 BMW 745. (252 HP @ 5200 RPM). In normal driving conditions, 2009 Audi S4 should accelerate faster than 1981 BMW 745. With that said, vehicle weight also plays an important factor in acceleration. 1981 BMW 745 weights approximately 660 kg more than 2009 Audi S4.
Because 2009 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, 2009 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, 2009 Audi S4 (410 Nm @ 3500 RPM) has 30 more torque (in Nm) than 1981 BMW 745. (380 Nm @ 2200 RPM). This means 2009 Audi S4 will have an easier job in driving up hills or pulling heavy equipment than 1981 BMW 745. 2009 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. 2009 Audi S4 will be easier to drive especially in heavy traffic.
Compare all specifications:
| 2009 Audi S4 | 1981 BMW 745 | |
| Make | Audi | BMW |
| Model | S4 | 745 |
| Year Released | 2009 | 1981 |
| Body Type | Convertible | Sedan |
| Engine Position | Front | Front |
| Engine Size | 4161 cc | 3430 cc |
| Engine Cylinders | 8 cylinders | 6 cylinders |
| Engine Type | V | in-line |
| Horse Power | 340 HP | 252 HP |
| Engine RPM | 6800 RPM | 5200 RPM |
| Torque | 410 Nm | 380 Nm |
| Torque RPM | 3500 RPM | 2200 RPM |
| Engine Bore Size | 84.5 mm | 92 mm |
| Engine Stroke Size | 92.8 mm | 86 mm |
| Drive Type | 4WD | Rear |
| Transmission Type | Automatic | Manual |
| Number of Seats | 4 seats | 5 seats |
| Number of Doors | 2 doors | 4 doors |
| Vehicle Weight | 930 kg | 1590 kg |
| Vehicle Length | 4580 mm | 4870 mm |
| Vehicle Width | 1780 mm | 1810 mm |
| Vehicle Height | 1400 mm | 1440 mm |
| Wheelbase Size | 2660 mm | 2800 mm |
| Fuel Tank Capacity | 63 L | 100 L |
