1991 BMW Z1 vs. 1971 Renault 15
To start off, 1991 BMW Z1 is newer by 20 year(s). Which means there will be less support and parts availability for 1971 Renault 15. In addition, the cost of maintenance, including insurance, on 1971 Renault 15 would be higher. At 2,497 cc (6 cylinders), 1991 BMW Z1 is equipped with a bigger engine. In terms of performance, 1991 BMW Z1 (175 HP @ 5800 RPM) has 86 more horse power than 1971 Renault 15. (89 HP @ 5500 RPM). In normal driving conditions, 1991 BMW Z1 should accelerate faster than 1971 Renault 15. With that said, vehicle weight also plays an important factor in acceleration. 1991 BMW Z1 weights approximately 230 kg more than 1971 Renault 15. 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 BMW Z1 (230 Nm @ 4000 RPM) has 105 more torque (in Nm) than 1971 Renault 15. (125 Nm @ 3000 RPM). This means 1991 BMW Z1 will have an easier job in driving up hills or pulling heavy equipment than 1971 Renault 15.
Compare all specifications:
| 1991 BMW Z1 | 1971 Renault 15 | |
| Make | BMW | Renault |
| Model | Z1 | 15 |
| Year Released | 1991 | 1971 |
| Engine Position | Front | Front |
| Engine Size | 2497 cc | 1565 cc |
| Engine Cylinders | 6 cylinders | 4 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 2 valves | 2 valves |
| Horse Power | 175 HP | 89 HP |
| Engine RPM | 5800 RPM | 5500 RPM |
| Torque | 230 Nm | 125 Nm |
| Torque RPM | 4000 RPM | 3000 RPM |
| Engine Bore Size | 82 mm | 77 mm |
| Engine Stroke Size | 78.8 mm | 84 mm |
| Engine Compression Ratio | 11.0:1 | 9.3:1 |
| Fuel Type | Gasoline | Gasoline |
| Number of Seats | 2 seats | 4 seats |
| Vehicle Weight | 1250 kg | 1020 kg |
| Vehicle Length | 3960 mm | 4260 mm |
| Vehicle Width | 1810 mm | 1640 mm |
| Vehicle Height | 1280 mm | 1320 mm |
| Wheelbase Size | 2450 mm | 2440 mm |
