2003 BMW X3 vs. 1991 BMW 730
To start off, 2003 BMW X3 is newer by 12 year(s). Which means there will be less support and parts availability for 1991 BMW 730. In addition, the cost of maintenance, including insurance, on 1991 BMW 730 would be higher. At 2,986 cc (6 cylinders), 1991 BMW 730 is equipped with a bigger engine. In terms of performance, 2003 BMW X3 (189 HP @ 6000 RPM) has 4 more horse power than 1991 BMW 730. (185 HP @ 5800 RPM). In normal driving conditions, 2003 BMW X3 should accelerate faster than 1991 BMW 730. With that said, vehicle weight also plays an important factor in acceleration. 2003 BMW X3 weights approximately 215 kg more than 1991 BMW 730. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Because 2003 BMW X3 is four wheel drive (4WD), it will have significant more traction and grip than 1991 BMW 730. In wet, icy, snow, or gravel driving conditions, 2003 BMW X3 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, 1991 BMW 730 (260 Nm @ 4000 RPM) has 15 more torque (in Nm) than 2003 BMW X3. (245 Nm @ 3500 RPM). This means 1991 BMW 730 will have an easier job in driving up hills or pulling heavy equipment than 2003 BMW X3.
Compare all specifications:
| 2003 BMW X3 | 1991 BMW 730 | |
| Make | BMW | BMW |
| Model | X3 | 730 |
| Year Released | 2003 | 1991 |
| Body Type | SUV | Sedan |
| Engine Position | Front | Front |
| Engine Size | 2494 cc | 2986 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | in-line | in-line |
| Horse Power | 189 HP | 185 HP |
| Engine RPM | 6000 RPM | 5800 RPM |
| Torque | 245 Nm | 260 Nm |
| Torque RPM | 3500 RPM | 4000 RPM |
| Engine Bore Size | 84 mm | 89 mm |
| Engine Stroke Size | 75 mm | 80 mm |
| Engine Compression Ratio | 10.5:1 | 9.0:1 |
| Drive Type | 4WD | Rear |
| Transmission Type | Manual | Manual |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 5 doors | 4 doors |
| Vehicle Weight | 1815 kg | 1600 kg |
| Vehicle Length | 4570 mm | 4920 mm |
| Vehicle Width | 1860 mm | 1850 mm |
| Vehicle Height | 1680 mm | 1420 mm |
| Wheelbase Size | 2890 mm | 2840 mm |
| Fuel Tank Capacity | 67 L | 90 L |
