1991 BMW Z1 vs. 1997 BMW 730
To start off, 1997 BMW 730 is newer by 6 year(s). Which means there will be less support and parts availability for 1991 BMW Z1. In addition, the cost of maintenance, including insurance, on 1991 BMW Z1 would be higher. At 2,792 cc (6 cylinders), 1997 BMW 730 is equipped with a bigger engine. In terms of performance, 1997 BMW 730 (190 HP @ 5300 RPM) has 15 more horse power than 1991 BMW Z1. (175 HP @ 5800 RPM) In normal driving conditions, 1997 BMW 730 should accelerate faster than 1991 BMW Z1. With that said, vehicle weight also plays an important factor in acceleration. 1997 BMW 730 weights approximately 495 kg more than 1991 BMW Z1. So despite on having greater horse power, its additional weight may have an impact towards its acceleration in comparison.
Both vehicles are rear wheel drive (RWD) - it offers better handling in dry conditions; in addition, if you are looking to drift, both vehicles do the job better than front wheel drive vehicles. 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, 1997 BMW 730 (279 Nm @ 3950 RPM) has 49 more torque (in Nm) than 1991 BMW Z1. (230 Nm @ 4000 RPM). This means 1997 BMW 730 will have an easier job in driving up hills or pulling heavy equipment than 1991 BMW Z1.
Compare all specifications:
| 1991 BMW Z1 | 1997 BMW 730 | |
| Make | BMW | BMW |
| Model | Z1 | 730 |
| Year Released | 1991 | 1997 |
| Body Type | Roadster | Sedan |
| Engine Position | Front | Front |
| Engine Size | 2497 cc | 2792 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 2 valves | 4 valves |
| Horse Power | 175 HP | 190 HP |
| Engine RPM | 5800 RPM | 5300 RPM |
| Torque | 230 Nm | 279 Nm |
| Torque RPM | 4000 RPM | 3950 RPM |
| Engine Bore Size | 82 mm | 84 mm |
| Engine Stroke Size | 78.8 mm | 84 mm |
| Fuel Type | Gasoline | Gasoline |
| Drive Type | Rear | Rear |
| Transmission Type | Manual | Manual |
| Number of Seats | 2 seats | 5 seats |
| Vehicle Weight | 1250 kg | 1745 kg |
| Vehicle Length | 3960 mm | 5130 mm |
| Vehicle Width | 1810 mm | 1870 mm |
| Vehicle Height | 1280 mm | 1430 mm |
| Wheelbase Size | 2450 mm | 2940 mm |
