2007 Audi A4 vs. 1991 Ford Sierra
To start off, 2007 Audi A4 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 1,751 cc (4 cylinders), 1991 Ford Sierra is equipped with a bigger engine. In terms of performance, 2007 Audi A4 (101 HP @ 5600 RPM) has 26 more horse power than 1991 Ford Sierra. (75 HP @ 4500 RPM). In normal driving conditions, 2007 Audi A4 should accelerate faster than 1991 Ford Sierra. With that said, vehicle weight also plays an important factor in acceleration. 2007 Audi A4 weights approximately 155 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, 1991 Ford Sierra (152 Nm @ 2200 RPM) has 4 more torque (in Nm) than 2007 Audi A4. (148 Nm @ 3800 RPM). This means 1991 Ford Sierra will have an easier job in driving up hills or pulling heavy equipment than 2007 Audi A4.
Compare all specifications:
| 2007 Audi A4 | 1991 Ford Sierra | |
| Make | Audi | Ford |
| Model | A4 | Sierra |
| Year Released | 2007 | 1991 |
| Engine Position | Front | Front |
| Engine Size | 1595 cc | 1751 cc |
| Engine Cylinders | 4 cylinders | 4 cylinders |
| Engine Type | in-line | in-line |
| Horse Power | 101 HP | 75 HP |
| Engine RPM | 5600 RPM | 4500 RPM |
| Torque | 148 Nm | 152 Nm |
| Torque RPM | 3800 RPM | 2200 RPM |
| Engine Bore Size | 81 mm | 82.5 mm |
| Engine Stroke Size | 77.4 mm | 82 mm |
| Engine Compression Ratio | 10.5:1 | 21.5:1 |
| Fuel Type | Gasoline - Premium | Diesel |
| Number of Seats | 5 seats | 5 seats |
| Number of Doors | 4 doors | 4 doors |
| Vehicle Weight | 1300 kg | 1145 kg |
| Vehicle Length | 4550 mm | 4430 mm |
| Vehicle Width | 1780 mm | 1700 mm |
| Vehicle Height | 1430 mm | 1370 mm |
| Wheelbase Size | 2650 mm | 2620 mm |
| Fuel Tank Capacity | 70 L | 60 L |
