2006 BMW Z4 vs. 2011 BMW 123
To start off, 2011 BMW 123 is newer by 5 year(s). Which means there will be less support and parts availability for 2006 BMW Z4. In addition, the cost of maintenance, including insurance, on 2006 BMW Z4 would be higher. At 2,492 cc (6 cylinders), 2006 BMW Z4 is equipped with a bigger engine. In terms of performance, 2011 BMW 123 (202 HP @ 4400 RPM) has 13 more horse power than 2006 BMW Z4. (189 HP @ 6000 RPM) In normal driving conditions, 2011 BMW 123 should accelerate faster than 2006 BMW Z4. With that said, vehicle weight also plays an important factor in acceleration. 2011 BMW 123 weights approximately 150 kg more than 2006 BMW Z4. 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, 2011 BMW 123 (400 Nm @ 2000 RPM) has 155 more torque (in Nm) than 2006 BMW Z4. (245 Nm @ 3500 RPM). This means 2011 BMW 123 will have an easier job in driving up hills or pulling heavy equipment than 2006 BMW Z4.
Compare all specifications:
| 2006 BMW Z4 | 2011 BMW 123 | |
| Make | BMW | BMW |
| Model | Z4 | 123 |
| Year Released | 2006 | 2011 |
| Engine Position | Front | Front |
| Engine Size | 2492 cc | 1995 cc |
| Engine Cylinders | 6 cylinders | 4 cylinders |
| Engine Type | in-line | in-line |
| Valves per Cylinder | 4 valves | 4 valves |
| Horse Power | 189 HP | 202 HP |
| Engine RPM | 6000 RPM | 4400 RPM |
| Torque | 245 Nm | 400 Nm |
| Torque RPM | 3500 RPM | 2000 RPM |
| Fuel Type | Gasoline - Premium | Diesel |
| Acceleration 0-100mph | 7 seconds | 6.9 seconds |
| Drive Type | Rear | Rear |
| Number of Seats | 2 seats | 5 seats |
| Number of Doors | 2 doors | 3 doors |
| Vehicle Weight | 1335 kg | 1485 kg |
| Vehicle Length | 4100 mm | 4239 mm |
| Vehicle Width | 1790 mm | 1748 mm |
| Vehicle Height | 1310 mm | 1421 mm |
| Wheelbase Size | 2500 mm | 2660 mm |
| Fuel Consumption Overall | 9 L/100km | 5.5 L/100km |
| Fuel Tank Capacity | 55 L | 51 L |
