2006 BMW Z4 vs. 1991 Buick Roadmaster
To start off, 2006 BMW Z4 is newer by 15 year(s). Which means there will be less support and parts availability for 1991 Buick Roadmaster. In addition, the cost of maintenance, including insurance, on 1991 Buick Roadmaster would be higher. At 5,002 cc (8 cylinders), 1991 Buick Roadmaster is equipped with a bigger engine. In terms of performance, 2006 BMW Z4 (189 HP @ 6000 RPM) has 21 more horse power than 1991 Buick Roadmaster. (168 HP @ 4200 RPM). In normal driving conditions, 2006 BMW Z4 should accelerate faster than 1991 Buick Roadmaster. With that said, vehicle weight also plays an important factor in acceleration. 1991 Buick Roadmaster weights approximately 665 kg more than 2006 BMW Z4.
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, 1991 Buick Roadmaster (346 Nm @ 2400 RPM) has 101 more torque (in Nm) than 2006 BMW Z4. (245 Nm @ 3500 RPM). This means 1991 Buick Roadmaster will have an easier job in driving up hills or pulling heavy equipment than 2006 BMW Z4. 1991 Buick Roadmaster has automatic transmission and 2006 BMW Z4 has manual transmission. 2006 BMW Z4 will offer better control over acceleration and deceleration in addition to better fuel efficiency overall. 1991 Buick Roadmaster will be easier to drive especially in heavy traffic.
Compare all specifications:
| 2006 BMW Z4 | 1991 Buick Roadmaster | |
| Make | BMW | Buick |
| Model | Z4 | Roadmaster |
| Year Released | 2006 | 1991 |
| Body Type | Convertible | Station Wagon |
| Engine Position | Front | Front |
| Engine Size | 2492 cc | 5002 cc |
| Engine Cylinders | 6 cylinders | 8 cylinders |
| Engine Type | in-line | V |
| Horse Power | 189 HP | 168 HP |
| Engine RPM | 6000 RPM | 4200 RPM |
| Torque | 245 Nm | 346 Nm |
| Torque RPM | 3500 RPM | 2400 RPM |
| Fuel Type | Gasoline - Premium | Gasoline |
| Drive Type | Rear | Rear |
| Transmission Type | Manual | Automatic |
| Number of Seats | 2 seats | 5 seats |
| Number of Doors | 2 doors | 5 doors |
| Vehicle Weight | 1335 kg | 2000 kg |
| Vehicle Length | 4100 mm | 5540 mm |
| Vehicle Width | 1790 mm | 2040 mm |
| Vehicle Height | 1310 mm | 1540 mm |
| Wheelbase Size | 2500 mm | 2950 mm |
