2007 BMW Z4 vs. 1991 Ford Sierra
To start off, 2007 BMW Z4 is newer by 16 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 3,246 cc (6 cylinders), 2007 BMW Z4 is equipped with a bigger engine. In terms of performance, 2007 BMW Z4 (338 HP @ 7900 RPM) has 263 more horse power than 1991 Ford Sierra. (75 HP @ 4500 RPM). In normal driving conditions, 2007 BMW Z4 should accelerate faster than 1991 Ford Sierra. With that said, vehicle weight also plays an important factor in acceleration. 2007 BMW Z4 weights approximately 340 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, 2007 BMW Z4 (365 Nm @ 4900 RPM) has 213 more torque (in Nm) than 1991 Ford Sierra. (152 Nm @ 2200 RPM). This means 2007 BMW Z4 will have an easier job in driving up hills or pulling heavy equipment than 1991 Ford Sierra.
Compare all specifications:
| 2007 BMW Z4 | 1991 Ford Sierra | |
| Make | BMW | Ford |
| Model | Z4 | Sierra |
| Year Released | 2007 | 1991 |
| Engine Position | Front | Front |
| Engine Size | 3246 cc | 1751 cc |
| Engine Cylinders | 6 cylinders | 4 cylinders |
| Engine Type | in-line | in-line |
| Horse Power | 338 HP | 75 HP |
| Engine RPM | 7900 RPM | 4500 RPM |
| Torque | 365 Nm | 152 Nm |
| Torque RPM | 4900 RPM | 2200 RPM |
| Engine Bore Size | 87 mm | 82.5 mm |
| Engine Stroke Size | 91 mm | 82 mm |
| Engine Compression Ratio | 11.5:1 | 21.5:1 |
| Fuel Type | Gasoline - Premium | Diesel |
| Number of Seats | 2 seats | 5 seats |
| Number of Doors | 2 doors | 4 doors |
| Vehicle Weight | 1485 kg | 1145 kg |
| Vehicle Length | 4120 mm | 4430 mm |
| Vehicle Width | 1790 mm | 1700 mm |
| Vehicle Height | 1310 mm | 1370 mm |
| Wheelbase Size | 2500 mm | 2620 mm |
| Fuel Tank Capacity | 55 L | 60 L |
