Car comparison

BMW 6 Series (E63) 645CivsBMW 6 Series (E24) 635CSi

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

New comparison

BMW 6 Series (E63)

645Ci

333 hp4398 ccGasolineRWDAutomaticNaturally aspiratedCoupe2003-2005
VS

BMW 6 Series (E24)

635CSi

218 hp3453 ccGasolineRWDManualNaturally aspiratedCoupe1978-1982

Comparison overview

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

Best choices

BMW 6 Series (E63) 645Ci

  • Quickest 0-100 km/h
    5.8 s
  • Fastest top speed
    265 km/h
    165 mph Unrestricted
    250 km/h
    155 mph Restricted
  • Most powerful
    333 hp
    248 kW
  • Highest torque
    450 Nm
    332 lb-ft
  • Best power-to-weight
    196 hp/t
    147 kW/t
    5.1 kg/hp
  • Largest trunk
    450 L
  • Best overall score
    63/100
  • Best performance score
    68/100
  • Best practicality score
    53/100

BMW 6 Series (E24) 635CSi

  • Lightest
    1,500 kg
    3,307 lb
  • Lowest combined fuel consumption
    10.0 L/100 km
    23.5 mpg US
    28.2 mpg UK
  • Best estimated range
    700 km
    435 mi
  • Best economy score
    80/100

Specification comparison

Specification comparison
ModelBMW6 Series (E63)645CiBMW6 Series (E24)635CSi
Power
333hp248kW
218hp163kW
Torque
450Nm332lb-ft
310Nm229lb-ft
Curb weight
1,695kg3,737lb
1,500kg3,307lb
Gross weight
2,065kg4,553lb
1,860kg4,101lb
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Calculated
222 km/h
138 mph
To 99% top speed
79.6s99% target: 262 km/h / 163 mph
Calculated
94.9s99% target: 220 km/h / 137 mph
Calculated
0-100 km/h
5.8s
7.6s
0-200 km/h
20.3s
Calculated
40.5s
Calculated
0-60 mph
5.5s
Calculated
7.2s
Calculated
Fuel consumption
10.9L/100 km21.6mpg US25.9mpg UK
10L/100 km23.5mpg US28.2mpg UK
Fuel consumption city
16.1L/100 km14.6mpg US17.5mpg UK
-
Fuel consumption highway
8L/100 km29.4mpg US35.3mpg UK
-
Quarter mile
13.9s
Calculated
15.5s
Calculated
Power-to-weight
196hp/t147kW/t89hp/1000 lb
Calculated
145hp/t108kW/t66hp/1000 lb
Calculated
Torque-to-weight
265Nm/t178lb-ft/ton
Calculated
207Nm/t138lb-ft/ton
Calculated
Estimated range
642km399mi
Calculated
700km435mi
Calculated
Displacement
4,398cc268cu in
3,453cc211cu in
Length
4,820mm190in
4,755mm187in
Width
1,855mm73in
1,725mm68in
Height
1,373mm54in
1,365mm54in
Wheelbase
2,780mm109in
2,626mm103in
Front track
1,558mm61in
1,422mm56in
Rear track
1,592mm63in
1,487mm59in
Trunk volume
450L
415L
Doors
2
2
Seats
4
4
Fuel tank
70L
70L
CO2 emissions
264g/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 (E63) 645CiBMW 6 Series (E24) 635CSiPowerTorque
  • BMW 6 Series (E63) 645Ci: Power / Torque
  • BMW 6 Series (E24) 635CSi: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
BMW6 Series (E63)645Ci6,100 rpm3,600 rpm6,350 rpm
BMW6 Series (E24)635CSi5,200 rpm4,000 rpm5,450 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricBMW6 Series (E63)645CiBMW6 Series (E24)635CSi
Acceleration checkpoints
0-60 mph
0-97 km/h
5.5 s
7.2 s
0-100 km/h
0-62 mph
5.8 s
7.6 s
0-200 km/h
0-124 mph
20.3 s
40.5 s
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Likely limited
222 km/h
138 mph
Drag race simulation
60 ft
18 m
2.3 s
2.4 s
330 ft
101 m
6.1 s
6.6 s
1/8 mile
201 m
9.1 s
10.0 s
1000 ft
305 m
11.7 s
13.0 s
1/4 mile
402 m
13.9 s
15.5 s
Trap speed
1/4 mile
402 m
169 km/h
105 mph
146 km/h
90 mph

Power comparison

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

Chart data table
VehicleValue
BMW6 Series (E63)645Ci
333 hp
248 kW
BMW6 Series (E24)635CSi
218 hp
163 kW

BMW 6 Series (E63) 645Ci has 115 hp more than BMW 6 Series (E24) 635CSi.

The biggest power difference is between BMW 6 Series (E24) 635CSi and BMW 6 Series (E63) 645Ci: 115 hp (86 kW).

Torque comparison

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

Chart data table
VehicleValue
BMW6 Series (E63)645Ci
450 Nm
332 lb-ft
BMW6 Series (E24)635CSi
310 Nm
229 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
BMW6 Series (E63)645Ci
1,695 kg
3,737 lb
BMW6 Series (E24)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
VehicleValue
BMW6 Series (E63)645Ci
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
BMW6 Series (E24)635CSi
222 km/h
138 mph

0-100 km/h comparison

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

Chart data table
VehicleValue
BMW6 Series (E63)645Ci5.8 s
BMW6 Series (E24)635CSi7.6 s

The biggest 0-100 km/h difference is between BMW 6 Series (E63) 645Ci and BMW 6 Series (E24) 635CSi: 1.8 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 (E63)645Ci
10.9 L/100 km
21.6 mpg US
25.9 mpg UK
BMW6 Series (E24)635CSi
10.0 L/100 km
23.5 mpg US
28.2 mpg UK

The biggest fuel consumption difference is between BMW 6 Series (E24) 635CSi and BMW 6 Series (E63) 645Ci: 0.9 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 (E63)645Ci
196 hp/t
147 kW/t
5.1 kg/hp
BMW6 Series (E24)635CSi
145 hp/t
108 kW/t
6.9 kg/hp

Estimated range comparison

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

Chart data table
VehicleValue
BMW6 Series (E63)645Ci
642 km
399 mi
BMW6 Series (E24)635CSi
700 km
435 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
BMW6 Series (E63)645Ci
333 hp
248 kW
5.8 s
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
BMW6 Series (E24)635CSi
218 hp
163 kW
7.6 s
222 km/h
138 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 (E63)645Ci
Power
333 hp
248 kW
0-100 km/h5.8 s
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Doors/seats
2 doors
4 seats
Trunk
450 L
15.9 cu ft
Length
4,820 mm
189.8 in
Height
1,373 mm
54.1 in
BMW6 Series (E24)635CSi
Power
218 hp
163 kW
0-100 km/h7.6 s
Top speed
222 km/h
138 mph
Doors/seats
2 doors
4 seats
Trunk
415 L
14.7 cu ft
Length
4,755 mm
187.2 in
Height
1,365 mm
53.7 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 (E63)645Ci
Power
333 hp
248 kW
0-100 km/h5.8 s
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
10.9 L/100 km
21.6 mpg US
25.9 mpg UK
BMW6 Series (E24)635CSi
Power
218 hp
163 kW
0-100 km/h7.6 s
Top speed
222 km/h
138 mph
10.0 L/100 km
23.5 mpg US
28.2 mpg UK

BMW 6 Series (E63) 645Ci 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 (E63)645Ci
10.9 L/100 km
21.6 mpg US
25.9 mpg UK
5.8 s
BMW6 Series (E24)635CSi
10.0 L/100 km
23.5 mpg US
28.2 mpg UK
7.6 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 (E63)645Ci
196 hp/t
147 kW/t
5.1 kg/hp
10.9 L/100 km
21.6 mpg US
25.9 mpg UK
BMW6 Series (E24)635CSi
145 hp/t
108 kW/t
6.9 kg/hp
10.0 L/100 km
23.5 mpg US
28.2 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleBMW6 Series (E63)645CiBMW6 Series (E24)635CSi
Power
333 hp
248 kW
218 hp
163 kW
Torque
450 Nm
332 lb-ft
310 Nm
229 lb-ft
Acceleration
5.8 s
7.6 s
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
222 km/h
138 mph
Lightness
1,695 kg
3,737 lb
1,500 kg
3,307 lb
Fuel consumption
10.9 L/100 km
21.6 mpg US
25.9 mpg UK
10.0 L/100 km
23.5 mpg US
28.2 mpg UK
Practicality
Doors/seats
2 doors
4 seats
Trunk
450 L
15.9 cu ft
Length
4,820 mm
189.8 in
Height
1,373 mm
54.1 in
Doors/seats
2 doors
4 seats
Trunk
415 L
14.7 cu ft
Length
4,755 mm
187.2 in
Height
1,365 mm
53.7 in
Range score
642 km
399 mi
700 km
435 mi
CO2 score
264 g/km
-
Trunk score
450 L
15.9 cu ft
415 L
14.7 cu ft
Power-to-weight score
196 hp/t
147 kW/t
5.1 kg/hp
145 hp/t
108 kW/t
6.9 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 (E63) 645CiBMW 6 Series (E24) 635CSi
Consumption10.9 L/100 km21.6 mpg US25.9 mpg UK10 L/100 km23.5 mpg US28.2 mpg UK
Cost / 100 km19.08 LC100 km17.50 LC100 km
Cost / 100 mi30.70 LC100 mi28.16 LC100 mi
Annual fuel used1,635 L432 US gal360 UK gal1,500 L396 US gal330 UK gal
Annual fuel cost2,861 LC/year2,625 LC/year

Head-to-head comparisons

BMW 6 Series (E63) 645Ci

  • Has 115 hp more
  • Has 140 Nm more
  • Is 1.8 s quicker from 0-100 km/h
  • Has 43 km/h (27 mph) higher top speed
  • Has 51 hp/t better power-to-weight
  • Has 35 L more trunk volume

Pros

  • Quickest 0-100 km/h in this comparison
  • Highest top speed
  • Most powerful
  • Highest torque
  • Best power-to-weight ratio
  • Largest trunk

Cons

  • Highest combined fuel consumption
  • Heaviest

BMW 6 Series (E24) 635CSi

  • Is 195 kg lighter
  • Uses 0.9 L/100 km less fuel
  • Has 58 km (36 mi) more estimated range

Pros

  • Lightest
  • Lowest combined fuel consumption
  • Best estimated range

Cons

  • Slowest 0-100 km/h
  • Lowest power
  • Lowest top speed
  • Smallest trunk

Choose cars to compare

Brand
Model
Generation
Engine or modification
BMW 6 Series (E63) 645Ci
BMW 6 Series (E24) 635CSi
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