85points

BMW M6 Convertible (2015)

91points

BMW Z4 Roadster sDrive20i (2014)

Comparison winner
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39 facts in comparison

BMW M6 Convertible (2015) vs BMW Z4 Roadster sDrive20i (2014)

BMW M6 Convertible (2015)
BMW Z4 Roadster sDrive20i (2014)
BMW M6 Convertible (2015)
BMW Z4 Roadster sDrive20i (2014)

Why is BMW M6 Convertible (2015) better than BMW Z4 Roadster sDrive20i (2014)?

  • 2.6s faster acceleration (0-100)
    4.3svs6.9s
  • Has a rear-view camera
  • Has height-adjustable seat belts
  • Has air suspension
  • Has stolen vehicle tracking system
  • Has ISOFIX/LATCH
  • 31mm narrower
    1.92mvs1951mm
  • Has Stop-Start system

Why is BMW Z4 Roadster sDrive20i (2014) better than BMW M6 Convertible (2015)?

  • 575kg lighter
    1.47tvs2045000g
  • 5.1l/100 km better fuel economy (highway)
    5.6l/100 kmvs10.7l/100 km
  • 663mm shorter length
    4.24mvs4902mm
  • 78mm shorter
    1.29mvs1369mm
  • 6.8l/100 km better fuel economy (city)
    8.9l/100 kmvs15.7l/100 km
  • 6.4l/100 km better fuel economy (combined)
    6.8l/100 kmvs13.2l/100 km
  • 1.3m smaller turn radius
    10.7mvs12m
  • 72g/km less CO2 emissions
    159g/kmvs231g/km

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Top specs, facts and figures

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General info

1.Has dual-clutch transmission
BMW M6 Convertible (2015)
BMW Z4 Roadster sDrive20i (2014)

A dual-clutch transmission (DCT) is an automated manual transmission that allows the driver to control gear-shifts themselves or to let the computer decide. Upshifts are extremely fast, resulting in smooth acceleration, and due to the uninterrupted power flow it also has the benefit of increasing fuel efficiency.

2.Has rear-wheel drive
BMW M6 Convertible (2015)
BMW Z4 Roadster sDrive20i (2014)

Rear-wheel drive benefits from increased traction when accelerating, as the weight of the vehicle shifts to the rear over the drive wheels. The weight of the car is also more evenly distributed, resulting in improved handling.

3.Has air suspension
BMW M6 Convertible (2015)
BMW Z4 Roadster sDrive20i (2014)

Air suspension offers a smoother ride than the traditional steel spring suspension. It is also often adjustable, allowing you to raise or lower it based on the type of driving you are doing.

4. longer basic warranty (years)

4yrs

4yrs

The basic warranty of a car covers all aspects other than parts which are subject to normal wear and tear, such as windscreen wipers and brake pads. It lasts either a certain number of years or amount of kilometres driven.

Best

Nissan Versa Note S (2014)

Unlimited yrs

5. longer drivetrain warranty (years)

4yrs

4yrs

The drivetrain warranty covers parts of the car such as the engine, transmission, driveshaft etc. This is usually longer than the basic warranty. It lasts either a certain number of years or amount of kilometres driven.

Best

Kia Rondo Platinum (2014)

12yrs

6.Has fully independent suspension
BMW M6 Convertible (2015)
BMW Z4 Roadster sDrive20i (2014)

This allows all four wheels to move up and down independently, providing a smoother ride when, for example, going over bumps in the road.

relevant

Dimensions

1.weight

2.04t

1.47t

Best

Mitsubishi ASX (2017)

1.32kg

2. longer wheelbase

2.85m

2.5m

The wheelbase is the distance between the center of the front and rear wheels. A longer wheelbase provides the car with more stability and a smoother ride (although a shorter wheelbase can provide more responsive handling).

Best

Toyota Tundra SR5 (2014)

3.7m

3. shorter length

4.9m

4.24m

Best

Renault Twizy EV 13kW (2014)

2.34m

4.height

1.37m

1.29m

Best

Volvo XC70 (2015)

917mm

5.width

1.92m

1.95m

Best

Peugeot 208 Allure (2014)

1m

6. greater cargo volume

459l

227l

A larger cargo area is more practical as it allows you to transport more things.

Best

Nissan Murano CrossCabriolet (2014)

3448l

relevant

Speed

1. faster acceleration (0-100)

4.3s

6.9s

The time it takes for the car to accelerate from 0-100 kilometres per hour.

Best

Tesla Roadster

1.9s

2. faster top speed

249km/h

235km/h

The fastest speed that the car can reach.

Best

Hennessey Venom GT (2014)

447km/h

3. lower coefficient of drag

0.33Cd

0.35Cd

The coefficient of drag is one measurement of how well air travels around a vehicle. A lower value means it is more aerodynamic and the engine doesn't have to work as hard. It can result in faster speeds and lower fuel economy.

Best

Toyota Prius (2017)

0.24Cd

relevant

Engine

1. more cylinders

8

4

Although there are many aspects that determine the power, a higher number of cylinders is generally a good indication of the potential power of the engine.

Best

Bugatti Veyron 16.4 Grand Sport (2013)

16

2. better fuel economy (highway)

10.7l/100 km

5.6l/100 km

Fuel economy is a measurement of fuel efficiency, based on how far you can travel with a certain amount of petrol (gasoline). A lower fuel economy means the car will be cheaper to run.

Best

Ferrari 458 Spider (2013)

0l/100 km

3. higher maximum torque

678Nm

270Nm

Torque is a measurement of an engine’s power, closely related to horsepower. More torque indicates a more powerful car, and is also a good indication of its acceleration.

Best

Bugatti Veyron 16.4 Grand Sport (2013)

1250Nm

4.Has a turbocharged engine
BMW M6 Convertible (2015)
BMW Z4 Roadster sDrive20i (2014)

A turbocharger compresses the air entering the cylinders, allowing more air (and therefore more fuel) to be added - resulting in a more powerful explosion. This leads to an increase in horsepower without increasing the size and weight of the engine.

5. larger engine size

4.4l

3l

This measurement is the total volume of all the engine's cylinders, also known as the engine displacement. This is one of many aspects of an engine that determine its horsepower, but generally speaking a greater size indicates more power.

Best

SRT Viper (2014)

8.4l

6.Has Stop-Start system
BMW M6 Convertible (2015)
BMW Z4 Roadster sDrive20i (2014)

A Stop-Start system automatically turns off the engine when stopping in traffic or at a red light, and seamlessly starts it again when pressure is applied to the accelerator. This saves fuel and is more ecological.

relevant

Features

1.Has Bluetooth
BMW M6 Convertible (2015)
BMW Z4 Roadster sDrive20i (2014)

Bluetooth is a wireless technology that allows you to easily transfer data between different devices, such as smartphones, tablets and computers.

2.Has a rear-view camera
BMW M6 Convertible (2015)
BMW Z4 Roadster sDrive20i (2014)

A rear-view camera (also known as a back-up camera) provides a view of behind the vehicle, helping to prevent accidents. It is particularly useful in vehicles with large blind spots such as pickup trucks.

3.Has height-adjustable seat belts
BMW M6 Convertible (2015)
BMW Z4 Roadster sDrive20i (2014)

Height-adjustable seat belts permit passengers of different sizes to move the seat belt up or down for improved comfort. They are also especially useful for increasing the safety of children.

4.USB ports

1

1

With more USB ports, you are able to connect more devices.

Best

Porsche 918 Spyder (2015)

2

5.Has smart key as standard
BMW M6 Convertible (2015)
BMW Z4 Roadster sDrive20i (2014)

A smart key is a wireless key that offers several benefits over a traditional key. For example when you approach the car the doors will automatically unlock, and you can turn the engine on with the press of a button.

6.Has stolen vehicle tracking system
BMW M6 Convertible (2015)
BMW Z4 Roadster sDrive20i (2014)

The vehicle has a tracking system that utilises GPS, allowing you to locate it in case it is stolen.

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