The Comparative Analysis :

BMW 640i Convertible Steptronic (15 - 18) vs. Porsche 911 Carrera Convertible 4S PDK (08 - 12)

€ 91,700
BMW 640i Convertible Steptronic (15 - 18) BMW 640i Cabrio
€ 120,200
 Porsche 911 Carrera Convertible 4S PDK (08 - 12) Porsche 911 Carrera Convertible 4S
€ 91,700
Base Price ⓘBase price of a new vehicle with standard equipment in Germany at market launch.
€ 120,200

ⓘ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 18.1 inches longer, 1.7 inches wider and 2.6 inches taller than the Porsche 911 Carrera Convertible 4S.
BMW 640i Cabrio
Porsche 911 Carrera Convertible 4S
53.7
Blueprint BMW 640i Convertible Steptronic (15 - 18)
74.6
81.9
51.2
Blueprint Porsche 911 Carrera Convertible 4S PDK (08 - 12)
72.9
80.8
74.6 in
Width
72.9 in
81.9 in
Width Incl. Mirrors
80.8 in
53.7 in
Height
51.2 in
Blueprint BMW 640i Convertible Steptronic (15 - 18)
112.4
192.7
Blueprint Porsche 911 Carrera Convertible 4S PDK (08 - 12)
92.5
174.6
192.7 in
Length
174.6 in
112.4 in
Wheelbase
92.5 in

Vehicle Weight

BMW 640i Cabrio
Porsche 911 Carrera Convertible 4S
4178 lb
Curb Weight
3682 lb
5126 lb
Gross Vehicle
Weight
4343 lb
BMW 640i Convertible Steptronic (15 - 18)
Weight Difference:
496 lb
11.87 %
Porsche 911 Carrera Convertible 4S PDK (08 - 12)

General

BMW 640i Cabrio
Porsche 911 Carrera Convertible 4S
F12
Generation
997
Convertible
Car Body Style
Convertible
Premium Unleaded
Fuel Type
Premium Unleaded
Rear-wheel drive
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
380 hp
at 6500 rpm
BMW 640i Cabrio
316 hp
380 hp
Porsche 911 Carrera Convertible 4S
332 lb‑ft
at 1300 rpm
Max. Torque
310 lb‑ft
at 4400 rpm
BMW 640i Cabrio
332 lb‑ft
310 lb‑ft
Porsche 911 Carrera Convertible 4S

Performance

BMW 640i Cabrio
Porsche 911 Carrera Convertible 4S
155 mph
Maximum Speed
183 mph
5.5 sec
Acceleration 0 to 62 mph
4.7 sec
62 mph 62
mph

249 ft
0.000 sec

BMW 640i Cabrio

62 mph 62
mph

213 ft
0.000 sec

Porsche 911 Carrera Convertible 4S

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

Fuel Economy / Emissions

BMW 640i Cabrio
Porsche 911 Carrera Convertible 4S
Fuel Economy
31 mpg
combined
22 mpg
BMW 640i Cabrio
31 mpg
22 mpg
Porsche 911 Carrera Convertible 4S
22 mpg
city
15 mpg
No data
highway
31 mpg
Kraftstoffanzeige
18.5 gal
Fuel Tank Capacity
17.7 gal
Kraftstoffanzeige
565 mi
Range
389 mi
BMW 640i Cabrio
565 mi
389 mi
Porsche 911 Carrera Convertible 4S
Environmental Impact
145.8 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).
202.8 kWh
BMW 640i Cabrio
145.8 kWh
202.8 kWh
Porsche 911 Carrera Convertible 4S
Euro 6b (NEFZ)
Emission Standard
Euro 5
288 g/mi (NEFZ)
CO2 Emissions
404 g/mi (NEFZ)

Practical Convenience

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