Car comparison

BMW 6 Series Convertible (F12) 650ivsBMW 6 Series (E24) · Facelift 1987 M 635CSi

Compare specs, acceleration, fuel consumption, dimensions, practicality, and estimated running costs side by side.

New comparison

BMW 6 Series Convertible (F12)

650i

450 hp4395 ccGasolineAWDAutomaticTurbochargedCabriolet / convertible2012-2015
VS

BMW 6 Series (E24) · Facelift 1987

M 635CSi

260 hp3453 ccGasolineRWDManualNaturally aspiratedCoupe1987-1989

Comparison overview

Use the estimates as comparison hints and verify exact figures before making decisions.

Best choices

BMW 6 Series Convertible (F12) 650i

  • Quickest 0-100 km/h
    4.5 s
  • Fastest top speed
    260 km/h
    162 mph Unrestricted
    250 km/h
    155 mph Restricted
  • Most powerful
    450 hp
    336 kW
  • Highest torque
    650 Nm
    479 lb-ft
  • Best power-to-weight
    227 hp/t
    169 kW/t
    4.4 kg/hp
  • Lowest combined fuel consumption
    9.5 L/100 km
    24.8 mpg US
    29.7 mpg UK
  • Lowest city consumption
    13.3 L/100 km
    17.7 mpg US
    21.2 mpg UK
  • Lowest highway consumption
    7.3 L/100 km
    32.2 mpg US
    38.7 mpg UK
  • Best estimated range
    737 km
    458 mi
  • Best overall score
    68/100
  • Best performance score
    79/100
  • Best economy score
    81/100

Specification comparison

Specification comparison
ModelBMW6 Series Convertible (F12)650iBMW6 Series (E24)Facelift 1987M 635CSi
Power
450hp336kW
260hp194kW
Torque
650Nm479lb-ft
330Nm243lb-ft
Curb weight
1,980kg4,365lb
1,515kg3,340lb
Gross weight
2,480kg5,467lb
1,865kg4,112lb
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Calculated
242 km/h
150 mph
To 99% top speed
61.6s99% target: 257 km/h / 160 mph
Calculated
93.4s99% target: 240 km/h / 149 mph
Calculated
0-100 km/h
4.5s
6.9s
0-200 km/h
16.3s
Calculated
29.0s
Calculated
0-60 mph
4.3s
Calculated
6.5s
Calculated
Fuel consumption
9.5L/100 km24.8mpg US29.7mpg UK
11.9L/100 km19.8mpg US23.7mpg UK
Fuel consumption city
13.3L/100 km17.7mpg US21.2mpg UK
17.6L/100 km13.4mpg US16.1mpg UK
Fuel consumption highway
7.3L/100 km32.2mpg US38.7mpg UK
8.1L/100 km29mpg US34.9mpg UK
Quarter mile
12.7s
Calculated
14.9s
Calculated
Power-to-weight
227hp/t169kW/t103hp/1000 lb
Calculated
172hp/t128kW/t78hp/1000 lb
Calculated
Torque-to-weight
328Nm/t220lb-ft/ton
Calculated
218Nm/t146lb-ft/ton
Calculated
Estimated range
737km458mi
Calculated
588km366mi
Calculated
Displacement
4,395cc268cu in
3,453cc211cu in
Length
4,894mm193in
4,815mm190in
Width
1,894mm75in
1,725mm68in
Height
1,365mm54in
1,355mm53in
Wheelbase
2,855mm112in
2,625mm103in
Front track
1,600mm63in
1,430mm56in
Rear track
1,665mm66in
1,464mm58in
Ground clearance
123mm5in
-
Trunk volume
300L
335L
Max trunk volume
350L
-
Doors
2
2
Seats
4
4
Fuel tank
70L
70L
CO2 emissions
221g/km
-

Performance charts

Use the estimates as comparison hints and verify exact figures before making decisions.

Dyno simulation

Estimated stock-style power and torque curves by engine speed.

BMW 6 Series Convertible (F12) 650iBMW 6 Series (E24) Facelift 1987 M 635CSiPowerTorque
  • BMW 6 Series Convertible (F12) 650i: Power / Torque
  • BMW 6 Series (E24) Facelift 1987 M 635CSi: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
BMW6 Series Convertible (F12)650i5,500 rpm2,000-4,500 rpm5,750 rpm
BMW6 Series (E24)Facelift 1987M 635CSi6,500 rpm4,500 rpm6,750 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricBMW6 Series Convertible (F12)650iBMW6 Series (E24)Facelift 1987M 635CSi
Acceleration checkpoints
0-60 mph
0-97 km/h
4.3 s
6.5 s
0-100 km/h
0-62 mph
4.5 s
6.9 s
0-200 km/h
0-124 mph
16.3 s
29.0 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Likely limited
242 km/h
150 mph
Drag race simulation
60 ft
18 m
2.1 s
2.4 s
330 ft
101 m
5.5 s
6.4 s
1/8 mile
201 m
8.2 s
9.7 s
1000 ft
305 m
10.6 s
12.5 s
1/4 mile
402 m
12.7 s
14.9 s
Trap speed
1/4 mile
402 m
180 km/h
112 mph
154 km/h
96 mph

Power comparison

Bar comparison chart for Power. Higher is better · hp / kW

Chart data table
VehicleValue
BMW6 Series Convertible (F12)650i
450 hp
336 kW
BMW6 Series (E24)Facelift 1987M 635CSi
260 hp
194 kW

BMW 6 Series Convertible (F12) 650i has 190 hp more than BMW 6 Series (E24) Facelift 1987 M 635CSi.

The biggest power difference is between BMW 6 Series (E24) Facelift 1987 M 635CSi and BMW 6 Series Convertible (F12) 650i: 190 hp (142 kW).

Torque comparison

Bar comparison chart for Torque. Higher is better · Nm / lb-ft

Chart data table
VehicleValue
BMW6 Series Convertible (F12)650i
650 Nm
479 lb-ft
BMW6 Series (E24)Facelift 1987M 635CSi
330 Nm
243 lb-ft

Curb weight comparison

Bar comparison chart for Curb weight. Lower is better · kg / lb

Chart data table
VehicleValue
BMW6 Series Convertible (F12)650i
1,980 kg
4,365 lb
BMW6 Series (E24)Facelift 1987M 635CSi
1,515 kg
3,340 lb

Top speed without limiter comparison

Bar comparison chart for Top speed without limiter. Higher is better · km/h / mph

Chart data table
VehicleValue
BMW6 Series Convertible (F12)650i
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
BMW6 Series (E24)Facelift 1987M 635CSi
242 km/h
150 mph

0-100 km/h comparison

Bar comparison chart for 0-100 km/h. Lower is better · seconds

Chart data table
VehicleValue
BMW6 Series Convertible (F12)650i4.5 s
BMW6 Series (E24)Facelift 1987M 635CSi6.9 s

The biggest 0-100 km/h difference is between BMW 6 Series Convertible (F12) 650i and BMW 6 Series (E24) Facelift 1987 M 635CSi: 2.4 s.

Fuel consumption comparison

Bar comparison chart for Fuel consumption. Lower is better · L/100 km / mpg US / mpg UK

Chart data table
VehicleValue
BMW6 Series Convertible (F12)650i
9.5 L/100 km
24.8 mpg US
29.7 mpg UK
BMW6 Series (E24)Facelift 1987M 635CSi
11.9 L/100 km
19.8 mpg US
23.7 mpg UK

The biggest fuel consumption difference is between BMW 6 Series Convertible (F12) 650i and BMW 6 Series (E24) Facelift 1987 M 635CSi: 2.4 L/100 km.

Power-to-weight comparison

Bar comparison chart for Power-to-weight. Higher is better · hp/t / kW/t

Chart data table
VehicleValue
BMW6 Series Convertible (F12)650i
227 hp/t
169 kW/t
4.4 kg/hp
BMW6 Series (E24)Facelift 1987M 635CSi
172 hp/t
128 kW/t
5.8 kg/hp

Estimated range comparison

Bar comparison chart for Estimated range. Higher is better · km / mi

Chart data table
VehicleValue
BMW6 Series Convertible (F12)650i
737 km
458 mi
BMW6 Series (E24)Facelift 1987M 635CSi
588 km
366 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
BMW6 Series Convertible (F12)650i
450 hp
336 kW
4.5 s
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
BMW6 Series (E24)Facelift 1987M 635CSi
260 hp
194 kW
6.9 s
242 km/h
150 mph

Most attractive quadrant

Scatter chart with performance score on the X axis and practicality score on the Y axis.

Chart data table
VehiclePerformance scorePracticality score
BMW6 Series Convertible (F12)650i
Power
450 hp
336 kW
0-100 km/h4.5 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Doors/seats
2 doors
4 seats
Trunk
300 L
10.6 cu ft
Length
4,894 mm
192.7 in
Height
1,365 mm
53.7 in
BMW6 Series (E24)Facelift 1987M 635CSi
Power
260 hp
194 kW
0-100 km/h6.9 s
Top speed
242 km/h
150 mph
Doors/seats
2 doors
4 seats
Trunk
335 L
11.8 cu ft
Length
4,815 mm
189.6 in
Height
1,355 mm
53.3 in

Performance vs fuel economy

Cars closer to the top-right corner combine stronger performance with better fuel economy scores.

Performance vs fuel economy data table
VehiclePerformance scoreFuel economy score
BMW6 Series Convertible (F12)650i
Power
450 hp
336 kW
0-100 km/h4.5 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
9.5 L/100 km
24.8 mpg US
29.7 mpg UK
BMW6 Series (E24)Facelift 1987M 635CSi
Power
260 hp
194 kW
0-100 km/h6.9 s
Top speed
242 km/h
150 mph
11.9 L/100 km
19.8 mpg US
23.7 mpg UK

BMW 6 Series Convertible (F12) 650i is closest to the top-right balance target for performance and fuel economy.

Acceleration vs fuel consumption

Cars closer to the lower-left corner offer a better mix of quick acceleration and low fuel consumption.

Acceleration vs fuel consumption data table
VehicleFuel consumption, L/100 km0-100 km/h, s
BMW6 Series Convertible (F12)650i
9.5 L/100 km
24.8 mpg US
29.7 mpg UK
4.5 s
BMW6 Series (E24)Facelift 1987M 635CSi
11.9 L/100 km
19.8 mpg US
23.7 mpg UK
6.9 s

Power-to-weight vs fuel consumption

The shaded area favors higher power-to-weight with lower combined fuel consumption.

Power-to-weight vs fuel consumption data table
VehiclePower-to-weight, hp/tFuel consumption, L/100 km
BMW6 Series Convertible (F12)650i
227 hp/t
169 kW/t
4.4 kg/hp
9.5 L/100 km
24.8 mpg US
29.7 mpg UK
BMW6 Series (E24)Facelift 1987M 635CSi
172 hp/t
128 kW/t
5.8 kg/hp
11.9 L/100 km
19.8 mpg US
23.7 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleBMW6 Series Convertible (F12)650iBMW6 Series (E24)Facelift 1987M 635CSi
Power
450 hp
336 kW
260 hp
194 kW
Torque
650 Nm
479 lb-ft
330 Nm
243 lb-ft
Acceleration
4.5 s
6.9 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
242 km/h
150 mph
Lightness
1,980 kg
4,365 lb
1,515 kg
3,340 lb
Fuel consumption
9.5 L/100 km
24.8 mpg US
29.7 mpg UK
11.9 L/100 km
19.8 mpg US
23.7 mpg UK
Practicality
Doors/seats
2 doors
4 seats
Trunk
300 L
10.6 cu ft
Length
4,894 mm
192.7 in
Height
1,365 mm
53.7 in
Doors/seats
2 doors
4 seats
Trunk
335 L
11.8 cu ft
Length
4,815 mm
189.6 in
Height
1,355 mm
53.3 in
Range score
737 km
458 mi
588 km
366 mi
CO2 score
221 g/km
-
Trunk score
300 L
10.6 cu ft
335 L
11.8 cu ft
Power-to-weight score
227 hp/t
169 kW/t
4.4 kg/hp
172 hp/t
128 kW/t
5.8 kg/hp
Overall
Fixed score
Fixed score

Fuel cost and annual usage

Estimate running costs from combined consumption, your annual distance, and the fuel price in your local currency.

Enter the fuel price in your local currency, for example €/L, $/gal, £/L or any other local currency.

LC = Local Currency

Fuel cost and annual usage
VehicleBMW 6 Series Convertible (F12) 650iBMW 6 Series (E24) Facelift 1987 M 635CSi
Consumption9.5 L/100 km24.8 mpg US29.7 mpg UK11.9 L/100 km19.8 mpg US23.7 mpg UK
Cost / 100 km16.63 LC100 km20.83 LC100 km
Cost / 100 mi26.76 LC100 mi33.51 LC100 mi
Annual fuel used1,425 L376 US gal313 UK gal1,785 L472 US gal393 UK gal
Annual fuel cost2,494 LC/year3,124 LC/year

Head-to-head comparisons

BMW 6 Series Convertible (F12) 650i

  • Has 190 hp more
  • Has 320 Nm more
  • Is 2.4 s quicker from 0-100 km/h
  • Has 18 km/h (11 mph) higher top speed
  • Uses 2.4 L/100 km less fuel
  • Has 56 hp/t better power-to-weight
  • Has 149 km (92 mi) more estimated range

Pros

  • Quickest 0-100 km/h in this comparison
  • Highest top speed
  • Most powerful
  • Highest torque
  • Lowest combined fuel consumption
  • Best power-to-weight ratio
  • Best estimated range

Cons

  • Heaviest
  • Smallest trunk

Choose cars to compare

Brand
Model
Generation
Engine or modification
BMW 6 Series Convertible (F12) 650i
BMW 6 Series (E24) M 635CSi
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2 vehicles selected

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BMW 6 Series Convertible (F12) 650i vs BMW 6 Series (E24) · Facelift 1987 M 635CSi - car comparison - FastVsFaster