2007 Audi A3 vs. 2004 BMW 645
To start off, 2007 Audi A3 is newer by 3 year(s). Which means there will be less support and parts availability for 2004 BMW 645. In addition, the cost of maintenance, including insurance, on 2004 BMW 645 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 75 more horse power than 2007 Audi A3. (247 HP @ 6300 RPM) In normal driving conditions, 2004 BMW 645 should accelerate faster than 2007 Audi A3. With that said, vehicle weight also plays an important factor in acceleration. 2004 BMW 645 weights approximately 101 kg more than 2007 Audi A3. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 2007 Audi A3 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, 2007 Audi A3 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 127 more torque (in Nm) than 2007 Audi A3. (320 Nm). This means 2004 BMW 645 will have an easier job in driving up hills or pulling heavy equipment than 2007 Audi A3.
Compare all specifications:
| 2007 Audi A3 | 2004 BMW 645 | |
| Make | Audi | BMW |
| Model | A3 | 645 |
| Year Released | 2007 | 2004 |
| Body Type | Hatchback | Coupe |
| Engine Position | Front | Front |
| Engine Size | 3189 cc | 4392 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 247 HP | 322 HP |
| Engine RPM | 6300 RPM | 7400 RPM |
| Torque | 320 Nm | 447 Nm |
| Engine Bore Size | 84 mm | 92 mm |
| Engine Stroke Size | 95.9 mm | 83 mm |
| Engine Compression Ratio | 11.3:1 | 10.5:1 |
| Drive Type | 4WD | Rear |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 5 doors | 2 doors |
| Vehicle Weight | 1614 kg | 1715 kg |
| Vehicle Length | 4290 mm | 4840 mm |
| Vehicle Width | 1770 mm | 1860 mm |
| Vehicle Height | 1430 mm | 1380 mm |
| Wheelbase Size | 2580 mm | 2790 mm |
| Fuel Consumption Overall | 10.6 L/100km | 11.8 L/100km |
| Fuel Tank Capacity | 60 L | 70 L |
