1991 Audi Coupe vs. 2004 BMW 645
To start off, 2004 BMW 645 is newer by 13 year(s). Which means there will be less support and parts availability for 1991 Audi Coupe. In addition, the cost of maintenance, including insurance, on 1991 Audi Coupe would be higher. At 4,392 cc (8 cylinders), 2004 BMW 645 is equipped with a bigger engine. In terms of performance, 2004 BMW 645 (322 HP @ 7400 RPM) has 148 more horse power than 1991 Audi Coupe. (174 HP @ 5500 RPM) In normal driving conditions, 2004 BMW 645 should accelerate faster than 1991 Audi Coupe. With that said, vehicle weight also plays an important factor in acceleration. 2004 BMW 645 weights approximately 541 kg more than 1991 Audi Coupe. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 1991 Audi Coupe is four wheel drive (4WD), it will have significant more traction and grip than 2004 BMW 645. In wet, icy, snow, or gravel driving conditions, 1991 Audi Coupe 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, 2004 BMW 645 (447 Nm) has 198 more torque (in Nm) than 1991 Audi Coupe. (249 Nm). This means 2004 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 1991 Audi Coupe.
Compare all specifications:
| 1991 Audi Coupe | 2004 BMW 645 | |
| Make | Audi | BMW |
| Model | Coupe | 645 |
| Year Released | 1991 | 2004 |
| Body Type | Coupe | Coupe |
| Engine Position | Front | Front |
| Engine Size | 2770 cc | 4392 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | V | V |
| Horse Power | 174 HP | 322 HP |
| Engine RPM | 5500 RPM | 7400 RPM |
| Torque | 249 Nm | 447 Nm |
| Engine Bore Size | 82.5 mm | 92 mm |
| Engine Stroke Size | 86.4 mm | 83 mm |
| Engine Compression Ratio | 10.0:1 | 10.5:1 |
| Drive Type | 4WD | Rear |
| Number of Seats | 4 seats | 4 seats |
| Number of Doors | 3 doors | 2 doors |
| Vehicle Weight | 1174 kg | 1715 kg |
| Vehicle Length | 4370 mm | 4840 mm |
| Vehicle Width | 1720 mm | 1860 mm |
| Vehicle Height | 1380 mm | 1380 mm |
| Wheelbase Size | 2560 mm | 2790 mm |
| Fuel Tank Capacity | 80 L | 70 L |
