2008 BMW Z4 2.5i Steptronic vs. 2008 BMW Z4 2.5si Roadster
To start off, both 2008 BMW Z4 2.5i Steptronic and 2008 BMW Z4 2.5si Roadster were released in the same year (2008). Therefore the support and the availability on parts for both vehicles should be relatively similar. At 2,496 cc (6 cylinders), 2008 BMW Z4 2.5si Roadster is equipped with a bigger engine. In terms of performance, both vehicles can yield 215 horse power. So under normal driving conditions, the acceleration of both vehicles should be relatively similar. With that said, vehicle weight also plays an important factor in acceleration. 2008 BMW Z4 2.5si Roadster weights approximately 70 kg more than 2008 BMW Z4 2.5i Steptronic.
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, both vehicles can yield 250 Nm of torque. So under normal driving conditions, the ability to climb up hills and pull heavy equipment should be relatively similar for both vehicles. 2008 BMW Z4 2.5i Steptronic has automatic transmission and 2008 BMW Z4 2.5si Roadster has manual transmission. 2008 BMW Z4 2.5si Roadster will offer better control over acceleration and deceleration in addition to better fuel efficiency overall. 2008 BMW Z4 2.5i Steptronic will be easier to drive especially in heavy traffic.
Compare all specifications:
| 2008 BMW Z4 2.5i Steptronic | 2008 BMW Z4 2.5si Roadster | |
| Make | BMW | BMW |
| Model | Z4 | Z4 |
| Year Released | 2008 | 2008 |
| Body Type | Convertible | Convertible |
| Engine Position | Front | Front |
| Engine Size | 2494 cc | 2496 cc |
| Engine Cylinders | 6 cylinders | 6 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 215 HP | 215 HP |
| Engine RPM | 6500 RPM | 6500 RPM |
| Torque | 250 Nm | 250 Nm |
| Engine Compression Ratio | 10.5:1 | 11.0:1 |
| Fuel Type | Gasoline | Gasoline - Premium |
| Top Speed | 222 km/hour | 240 km/hour |
| Acceleration 0-100mph | 7.5 seconds | 7 seconds |
| Drive Type | Rear | Rear |
| Transmission Type | Automatic | Manual |
| Number of Seats | 2 seats | 2 seats |
| Number of Doors | 2 doors | 2 doors |
| Vehicle Weight | 1290 kg | 1360 kg |
| Vehicle Length | 4100 mm | 4100 mm |
| Vehicle Width | 1790 mm | 1790 mm |
| Vehicle Height | 1310 mm | 1310 mm |
| Wheelbase Size | 2500 mm | 2500 mm |
| Fuel Consumption Overall | 9.5 L/100km | 8.4 L/100km |
| Fuel Tank Capacity | 55 L | 55 L |
