2005 BMW X5 vs. 1991 Ford Sierra
To start off, 2005 BMW X5 is newer by 14 year(s). Which means there will be less support and parts availability for 1991 Ford Sierra. In addition, the cost of maintenance, including insurance, on 1991 Ford Sierra would be higher. At 4,392 cc (8 cylinders), 2005 BMW X5 is equipped with a bigger engine. In terms of performance, 2005 BMW X5 (321 HP @ 6100 RPM) has 246 more horse power than 1991 Ford Sierra. (75 HP @ 4500 RPM). In normal driving conditions, 2005 BMW X5 should accelerate faster than 1991 Ford Sierra. With that said, vehicle weight also plays an important factor in acceleration. 2005 BMW X5 weights approximately 1090 kg more than 1991 Ford Sierra. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Let's talk about torque, 2005 BMW X5 (450 Nm @ 3700 RPM) has 298 more torque (in Nm) than 1991 Ford Sierra. (152 Nm @ 2200 RPM). This means 2005 BMW X5 will have an easier job in driving up hills or pulling heavy equipment than 1991 Ford Sierra.
Compare all specifications:
| 2005 BMW X5 | 1991 Ford Sierra | |
| Make | BMW | Ford |
| Model | X5 | Sierra |
| Year Released | 2005 | 1991 |
| Engine Position | Front | Front |
| Engine Size | 4392 cc | 1751 cc |
| Engine Cylinders | 8 cylinders | 4 cylinders |
| Engine Type | V | in-line |
| Horse Power | 321 HP | 75 HP |
| Engine RPM | 6100 RPM | 4500 RPM |
| Torque | 450 Nm | 152 Nm |
| Torque RPM | 3700 RPM | 2200 RPM |
| Engine Bore Size | 92 mm | 82.5 mm |
| Engine Stroke Size | 83 mm | 82 mm |
| Engine Compression Ratio | 10.0:1 | 21.5:1 |
| Fuel Type | Gasoline - Premium | Diesel |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 5 doors | 4 doors |
| Vehicle Weight | 2235 kg | 1145 kg |
| Vehicle Length | 4670 mm | 4430 mm |
| Vehicle Width | 1880 mm | 1700 mm |
| Vehicle Height | 1710 mm | 1370 mm |
| Wheelbase Size | 2890 mm | 2620 mm |
| Fuel Tank Capacity | 92 L | 60 L |
