1991 Buick Roadmaster vs. 2009 BMW Z4
To start off, 2009 BMW Z4 is newer by 18 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 5,731 cc (8 cylinders), 1991 Buick Roadmaster is equipped with a bigger engine. In terms of performance, 2009 BMW Z4 (261 HP @ 6600 RPM) has 84 more horse power than 1991 Buick Roadmaster. (177 HP @ 4200 RPM) In normal driving conditions, 2009 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 445 kg more than 2009 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 (393 Nm @ 2400 RPM) has 78 more torque (in Nm) than 2009 BMW Z4. (315 Nm @ 2750 RPM). This means 1991 Buick Roadmaster will have an easier job in driving up hills or pulling heavy equipment than 2009 BMW Z4.
Compare all specifications:
| 1991 Buick Roadmaster | 2009 BMW Z4 | |
| Make | Buick | BMW |
| Model | Roadmaster | Z4 |
| Year Released | 1991 | 2009 |
| Body Type | Sedan | Coupe |
| Engine Position | Front | Front |
| Engine Size | 5731 cc | 2996 cc |
| Engine Cylinders | 8 cylinders | 6 cylinders |
| Engine Type | V | in-line |
| Horse Power | 177 HP | 261 HP |
| Engine RPM | 4200 RPM | 6600 RPM |
| Torque | 393 Nm | 315 Nm |
| Torque RPM | 2400 RPM | 2750 RPM |
| Engine Compression Ratio | 8.0:1 | 10.7:1 |
| Fuel Type | Gasoline | Gasoline - Premium |
| Drive Type | Rear | Rear |
| Transmission Type | Automatic | Automatic |
| Number of Seats | 5 seats | 2 seats |
| Number of Doors | 4 doors | 2 doors |
| Vehicle Weight | 1840 kg | 1395 kg |
| Vehicle Length | 5280 mm | 4100 mm |
| Vehicle Width | 2040 mm | 1790 mm |
| Vehicle Height | 1650 mm | 1270 mm |
| Wheelbase Size | 2950 mm | 2500 mm |
| Fuel Tank Capacity | 75 L | 55 L |
