The Comparative Analysis :

BMW 640i Convertible xDrive Steptronic (13 - 14) vs. Porsche 911 Carrera Convertible 4S PDK (12 - 15)

€ 87,300
BMW 640i Convertible xDrive Steptronic (13 - 14) BMW 640i Cabrio
€ 142,800
 Porsche 911 Carrera Convertible 4S PDK (12 - 15) Porsche 911 Carrera Convertible 4S
€ 87,300
Base Price ⓘBase price of a new vehicle with standard equipment in Germany at market launch.
€ 142,800

ⓘBase price of a new vehicle with standard equipment in Germany at market launch. Price Info

Vehicle Dimensions

The BMW 640i Cabrio is significantly bigger in every dimension. It's 15.9 inches longer, 1.7 inches wider and 2.8 inches taller than the Porsche 911 Carrera Convertible 4S.
BMW 640i Cabrio
Porsche 911 Carrera Convertible 4S
53.7
Blueprint BMW 640i Convertible xDrive Steptronic (13 - 14)
74.6
81.9
50.9
Blueprint Porsche 911 Carrera Convertible 4S PDK (12 - 15)
72.9
77.9
74.6 in
Width
72.9 in
81.9 in
Width Incl. Mirrors
77.9 in
53.7 in
Height
50.9 in
Blueprint BMW 640i Convertible xDrive Steptronic (13 - 14)
112.4
192.7
Blueprint Porsche 911 Carrera Convertible 4S PDK (12 - 15)
96.5
176.8
192.7 in
Length
176.8 in
112.4 in
Wheelbase
96.5 in

Vehicle Weight

BMW 640i Cabrio
Porsche 911 Carrera Convertible 4S
4376 lb
Curb Weight
3549 lb
5291 lb
Gross Vehicle
Weight
4310 lb
BMW 640i Convertible xDrive Steptronic (13 - 14)
Weight Difference:
827 lb
18.9 %
Porsche 911 Carrera Convertible 4S PDK (12 - 15)

General

BMW 640i Cabrio
Porsche 911 Carrera Convertible 4S
F12
Generation
991
Convertible
Car Body Style
Convertible
Premium Unleaded
Fuel Type
Premium Unleaded
Permanent all-wheel drive (AWD)
Drivetrain
Permanent all-wheel drive (AWD)
8-speed automatic transmission
Transmission
7-speed dual clutch transmission

Engine

BMW 640i Cabrio
Porsche 911 Carrera Convertible 4S
Straight-six gasoline engine with tur­bo­charger
Engine Type
6-cylinder boxer gasoline engine (nat­u­ral­ly as­pi­rat­ed engine)
BMW N55
Engine Series
N55-B30
Engine Code
4
Valves
4
6
Cylinders
6
3 L / 147 cu in
Displacement
3.8 L / 186 cu in
316 hp
at 5800 rpm
Power
424 hp
at 7500 rpm
BMW 640i Cabrio
316 hp
424 hp
Porsche 911 Carrera Convertible 4S
332 lb‑ft
at 1300 rpm
Max. Torque
325 lb‑ft
at 5750 rpm
BMW 640i Cabrio
332 lb‑ft
325 lb‑ft
Porsche 911 Carrera Convertible 4S

Performance

BMW 640i Cabrio
Porsche 911 Carrera Convertible 4S
155 mph
Maximum Speed
185 mph
5.4 sec
Acceleration 0 to 62 mph
4.4 sec
62 mph 62
mph

246 ft
0.000 sec

BMW 640i Cabrio

62 mph 62
mph

200 ft
0.000 sec

Porsche 911 Carrera Convertible 4S

▶ REPLAY
13.85 lb/hp
Weight-to-Power Ratio
8.37 lb/hp
BMW 640i Cabrio
13.85 lb/hp
8.37 lb/hp
Porsche 911 Carrera Convertible 4S

Fuel Economy / Emissions

BMW 640i Cabrio
Porsche 911 Carrera Convertible 4S
Fuel Economy
29 mpg
combined
26 mpg
BMW 640i Cabrio
29 mpg
26 mpg
Porsche 911 Carrera Convertible 4S
21 mpg
city
18 mpg
No data
highway
33 mpg
Kraftstoffanzeige
18.5 gal
Fuel Tank Capacity
18 gal
Kraftstoffanzeige
531 mi
Range
459 mi
BMW 640i Cabrio
531 mi
459 mi
Porsche 911 Carrera Convertible 4S
Environmental Impact
155.3 kWh
Total Energy Consumption
per 100 miles ⓘThe total energy consumption per 100 miles is the amount of energy consumed by a vehicle when burning fuel or using electricity per 100 miles (final energy), and the energy required to produce the appropriate amount of fuel or electricity (primary energy).
174.3 kWh
BMW 640i Cabrio
155.3 kWh
174.3 kWh
Porsche 911 Carrera Convertible 4S
Euro 6b (NEFZ)
Emission Standard
Euro 5 / Euro 6
309 g/mi (NEFZ)
CO2 Emissions
349 g/mi (NEFZ)

Practical Convenience

BMW 640i Cabrio
Porsche 911 Carrera Convertible 4S
2
Doors
2
4
No. of Seats
4
915 lb
Maximum Payload
761 lb
9.9 cu ft
Trunk Volume
3.5 cu ft
No data
Cargo Volume (Seats Down)
No data