Car comparison

BMW 6 Series Convertible (F12) 650ivsBMW 6 Series (E24) · Facelift 1982 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

BMW 6 Series (E24) · Facelift 1982

M 635CSi

286 hp3453 ccGasolineRWDManualNaturally aspiratedCoupe1984-1987

Comparison overview

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

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

BMW 6 Series (E24) Facelift 1982 M 635CSi

Lightest
1,500 kg
3,307 lb
Largest trunk
335 L
Best practicality score
49/100

Specification comparison

Specification comparison
Model	BMW6 Series Convertible (F12)650i	BMW6 Series (E24)Facelift 1982M 635CSi
Power	450hp336kW	286hp213kW
Torque	650Nm479lb-ft	340Nm251lb-ft
Curb weight	1,980kg4,365lb	1,500kg3,307lb
Gross weight	2,480kg5,467lb	1,850kg4,079lb
Top speed	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph Calculated	255 km/h 158 mph
To 99% top speed	61.4s99% target: 257 km/h / 160 mph Calculated	90.5s99% target: 252 km/h / 157 mph Calculated
0-100 km/h	4.5s	6.4s
0-200 km/h	16.3s Calculated	24.5s Calculated
0-60 mph	4.3s Calculated	6.1s Calculated
Fuel consumption	9.5L/100 km24.8mpg US29.7mpg UK	11.3L/100 km20.8mpg US25.0mpg UK
Fuel consumption city	13.3L/100 km17.7mpg US21.2mpg UK	16.5L/100 km14.3mpg US17.1mpg UK
Fuel consumption highway	7.3L/100 km32.2mpg US38.7mpg UK	7.8L/100 km30.2mpg US36.2mpg UK
Quarter mile	12.6s Calculated	14.5s Calculated
Power-to-weight	227hp/t169kW/t103hp/1000 lb Calculated	191hp/t142kW/t86hp/1000 lb Calculated
Torque-to-weight	328Nm/t220lb-ft/ton Calculated	227Nm/t152lb-ft/ton Calculated
Estimated range	737km458mi Calculated	619km385mi Calculated
Displacement	4,395cc268cu in	3,453cc211cu in
Length	4,894mm193in	4,755mm187in
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 1982 M 635CSiPowerTorque

Dyno simulation data table
Vehicle	Peak power RPM	Peak torque RPM	Max engine speed
BMW6 Series Convertible (F12)650i	5,500 rpm	2,000-4,500 rpm	5,750 rpm
BMW6 Series (E24)Facelift 1982M 635CSi	6,500 rpm	4,500 rpm	6,750 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
Metric	BMW6 Series Convertible (F12)650i	BMW6 Series (E24)Facelift 1982M 635CSi
	Acceleration checkpoints
0-60 mph 0-97 km/h	4.3 s	6.1 s
0-100 km/h 0-62 mph	4.5 s	6.4 s
0-200 km/h 0-124 mph	16.3 s	24.5 s
Top speed	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph Likely limited	255 km/h 158 mph
	Drag race simulation
60 ft 18 m	2.1 s	2.4 s
330 ft 101 m	5.5 s	6.3 s
1/8 mile 201 m	8.2 s	9.5 s
1000 ft 305 m	10.6 s	12.2 s
1/4 mile 402 m	12.6 s	14.5 s
Trap speed 1/4 mile 402 m	180 km/h 112 mph	160 km/h 99 mph

Power comparison

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

Chart data table
Vehicle	Value
BMW6 Series Convertible (F12)650i	450 hp 336 kW
BMW6 Series (E24)Facelift 1982M 635CSi	286 hp 213 kW

BMW 6 Series Convertible (F12) 650i has 164 hp more than BMW 6 Series (E24) Facelift 1982 M 635CSi.

The biggest power difference is between BMW 6 Series (E24) Facelift 1982 M 635CSi and BMW 6 Series Convertible (F12) 650i: 164 hp (122 kW).

Torque comparison

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

Chart data table
Vehicle	Value
BMW6 Series Convertible (F12)650i	650 Nm 479 lb-ft
BMW6 Series (E24)Facelift 1982M 635CSi	340 Nm 251 lb-ft

Curb weight comparison

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

Chart data table
Vehicle	Value
BMW6 Series Convertible (F12)650i	1,980 kg 4,365 lb
BMW6 Series (E24)Facelift 1982M 635CSi	1,500 kg 3,307 lb

Top speed without limiter comparison

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

Chart data table
Vehicle	Value
BMW6 Series Convertible (F12)650i	Unrestricted 260 km/h162 mph Restricted 250 km/h155 mph
BMW6 Series (E24)Facelift 1982M 635CSi	255 km/h 158 mph

0-100 km/h comparison

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

Chart data table
Vehicle	Value
BMW6 Series Convertible (F12)650i	4.5 s
BMW6 Series (E24)Facelift 1982M 635CSi	6.4 s

The biggest 0-100 km/h difference is between BMW 6 Series Convertible (F12) 650i and BMW 6 Series (E24) Facelift 1982 M 635CSi: 1.9 s.

Fuel consumption comparison

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

Chart data table
Vehicle	Value
BMW6 Series Convertible (F12)650i	9.5 L/100 km 24.8 mpg US 29.7 mpg UK
BMW6 Series (E24)Facelift 1982M 635CSi	11.3 L/100 km 20.8 mpg US 25.0 mpg UK

The biggest fuel consumption difference is between BMW 6 Series Convertible (F12) 650i and BMW 6 Series (E24) Facelift 1982 M 635CSi: 1.8 L/100 km.

Power-to-weight comparison

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

Chart data table
Vehicle	Value
BMW6 Series Convertible (F12)650i	227 hp/t 169 kW/t 4.4 kg/hp
BMW6 Series (E24)Facelift 1982M 635CSi	191 hp/t 142 kW/t 5.2 kg/hp

Estimated range comparison

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

Chart data table
Vehicle	Value
BMW6 Series Convertible (F12)650i	737 km 458 mi
BMW6 Series (E24)Facelift 1982M 635CSi	619 km 385 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
Vehicle	Power	Acceleration	Top 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 1982M 635CSi	286 hp 213 kW	6.4 s	255 km/h 158 mph

Most attractive quadrant

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

Vehicle

Performance score

Practicality score

BMW6 Series Convertible (F12)650i

Power	450 hp 336 kW
0-100 km/h	4.5 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 1982M 635CSi

Power	286 hp 213 kW
0-100 km/h	6.4 s
Top speed 255 km/h 158 mph

Doors/seats	2 doors 4 seats
Trunk	335 L 11.8 cu ft
Length	4,755 mm 187.2 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.

Vehicle

Performance score

Fuel economy score

BMW6 Series Convertible (F12)650i

Power	450 hp 336 kW
0-100 km/h	4.5 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 1982M 635CSi

Power	286 hp 213 kW
0-100 km/h	6.4 s
Top speed 255 km/h 158 mph

11.3 L/100 km

20.8 mpg US

25.0 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
Vehicle	Fuel consumption, L/100 km	0-100 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 1982M 635CSi	11.3 L/100 km 20.8 mpg US 25.0 mpg UK	6.4 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
Vehicle	Power-to-weight, hp/t	Fuel 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 1982M 635CSi	191 hp/t 142 kW/t 5.2 kg/hp	11.3 L/100 km 20.8 mpg US 25.0 mpg UK

Detailed score breakdown

Vehicle

BMW6 Series Convertible (F12)650i

BMW6 Series (E24)Facelift 1982M 635CSi

Power

450 hp

336 kW

286 hp

213 kW

Torque

650 Nm

479 lb-ft

340 Nm

251 lb-ft

Acceleration

4.5 s

6.4 s

Top speed

Unrestricted

260 km/h162 mph

Restricted

250 km/h155 mph

255 km/h

158 mph

Lightness

1,980 kg

4,365 lb

1,500 kg

3,307 lb

Fuel consumption

9.5 L/100 km

24.8 mpg US

29.7 mpg UK

11.3 L/100 km

20.8 mpg US

25.0 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	4,755 mm 187.2 in
Height	1,355 mm 53.3 in

Range score

737 km

458 mi

619 km

385 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

191 hp/t

142 kW/t

5.2 kg/hp

Overall

Fixed score

Fuel cost and annual usage

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

Average annual distanceDistance unitFuel price in your local currencyPrice unit

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
Vehicle	BMW 6 Series Convertible (F12) 650i	BMW 6 Series (E24) Facelift 1982 M 635CSi
Consumption	9.5 L/100 km24.8 mpg US29.7 mpg UK	11.3 L/100 km20.8 mpg US25 mpg UK
Cost / 100 km	16.63 LC100 km	19.78 LC100 km
Cost / 100 mi	26.76 LC100 mi	31.82 LC100 mi
Annual fuel used	1,425 L376 US gal313 UK gal	1,695 L448 US gal373 UK gal
Annual fuel cost	2,494 LC/year	2,966 LC/year