Car comparison

BMW Z8 (E52) 4.9vsBMW 6 Series Convertible (E64) 650i

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

New comparison

BMW Z8 (E52)

4.9

400 hp4941 ccGasolineRWDManualNaturally aspiratedCabriolet / convertible2000-2005
VS

BMW 6 Series Convertible (E64)

650i

367 hp4799 ccGasolineRWDManualNaturally aspiratedCabriolet / convertible2005-2007

Comparison overview

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

Best choices

BMW Z8 (E52) 4.9

  • Quickest 0-100 km/h
    4.7 s
  • Fastest top speed
    260 km/h
    162 mph Unrestricted
    250 km/h
    155 mph Restricted
  • Most powerful
    400 hp
    298 kW
  • Highest torque
    500 Nm
    369 lb-ft
  • Lightest
    1,660 kg
    3,660 lb
  • Best power-to-weight
    241 hp/t
    180 kW/t
    4.2 kg/hp
  • Best overall score
    61/100
  • Best performance score
    74/100

BMW 6 Series Convertible (E64) 650i

  • Lowest combined fuel consumption
    12.9 L/100 km
    18.2 mpg US
    21.9 mpg UK
  • Lowest city consumption
    19.1 L/100 km
    12.3 mpg US
    14.8 mpg UK
  • Lowest highway consumption
    9.3 L/100 km
    25.3 mpg US
    30.4 mpg UK
  • Best estimated range
    543 km
    337 mi
  • Largest trunk
    300 L
  • Best economy score
    72/100
  • Best practicality score
    45/100

Specification comparison

Specification comparison
ModelBMWZ8 (E52)4.9BMW6 Series Convertible (E64)650i
Power
400hp298kW
367hp274kW
Torque
500Nm369lb-ft
490Nm361lb-ft
Curb weight
1,660kg3,660lb
1,850kg4,079lb
Gross weight
1,900kg4,189lb
2,250kg4,960lb
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Calculated
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Calculated
To 99% top speed
59.2s99% target: 257 km/h / 160 mph
Calculated
78.9s99% target: 257 km/h / 160 mph
Calculated
0-100 km/h
4.7s
5.7s
0-200 km/h
16.3s
Calculated
20.7s
Calculated
0-60 mph
4.5s
Calculated
5.4s
Calculated
Fuel consumption
14.5L/100 km16.2mpg US19.5mpg UK
12.9L/100 km18.2mpg US21.9mpg UK
Fuel consumption city
21.1L/100 km11.1mpg US13.4mpg UK
19.1L/100 km12.3mpg US14.8mpg UK
Fuel consumption highway
10.6L/100 km22.2mpg US26.6mpg UK
9.3L/100 km25.3mpg US30.4mpg UK
Quarter mile
12.8s
Calculated
13.8s
Calculated
Power-to-weight
241hp/t180kW/t109hp/1000 lb
Calculated
198hp/t148kW/t90hp/1000 lb
Calculated
Torque-to-weight
301Nm/t202lb-ft/ton
Calculated
265Nm/t177lb-ft/ton
Calculated
Estimated range
503km313mi
Calculated
543km337mi
Calculated
Displacement
4,941cc302cu in
4,799cc293cu in
Length
4,400mm173in
4,820mm190in
Width
1,830mm72in
1,855mm73in
Height
1,317mm52in
1,373mm54in
Wheelbase
2,505mm99in
2,780mm109in
Front track
1,550mm61in
1,558mm61in
Rear track
1,570mm62in
1,596mm63in
Trunk volume
203L
300L
Max trunk volume-
350L
Doors
2
2
Seats
2
4
Fuel tank
73L
70L

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 Z8 (E52) 4.9BMW 6 Series Convertible (E64) 650iPowerTorque
  • BMW Z8 (E52) 4.9: Power / Torque
  • BMW 6 Series Convertible (E64) 650i: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
BMWZ8 (E52)4.96,600 rpm3,800 rpm6,850 rpm
BMW6 Series Convertible (E64)650i6,300 rpm3,400 rpm6,550 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricBMWZ8 (E52)4.9BMW6 Series Convertible (E64)650i
Acceleration checkpoints
0-60 mph
0-97 km/h
4.5 s
5.4 s
0-100 km/h
0-62 mph
4.7 s
5.7 s
0-200 km/h
0-124 mph
16.3 s
20.7 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Likely limited
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Likely limited
Drag race simulation
60 ft
18 m
2.1 s
2.3 s
330 ft
101 m
5.6 s
6.0 s
1/8 mile
201 m
8.4 s
9.0 s
1000 ft
305 m
10.8 s
11.6 s
1/4 mile
402 m
12.8 s
13.8 s
Trap speed
1/4 mile
402 m
180 km/h
112 mph
168 km/h
104 mph

Power comparison

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

Chart data table
VehicleValue
BMWZ8 (E52)4.9
400 hp
298 kW
BMW6 Series Convertible (E64)650i
367 hp
274 kW

BMW Z8 (E52) 4.9 has 33 hp more than BMW 6 Series Convertible (E64) 650i.

The biggest power difference is between BMW 6 Series Convertible (E64) 650i and BMW Z8 (E52) 4.9: 33 hp (25 kW).

Torque comparison

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

Chart data table
VehicleValue
BMWZ8 (E52)4.9
500 Nm
369 lb-ft
BMW6 Series Convertible (E64)650i
490 Nm
361 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
BMWZ8 (E52)4.9
1,660 kg
3,660 lb
BMW6 Series Convertible (E64)650i
1,850 kg
4,079 lb

Top speed without limiter comparison

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

Chart data table
VehicleValue
BMWZ8 (E52)4.9
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
BMW6 Series Convertible (E64)650i
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph

0-100 km/h comparison

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

Chart data table
VehicleValue
BMWZ8 (E52)4.94.7 s
BMW6 Series Convertible (E64)650i5.7 s

The biggest 0-100 km/h difference is between BMW Z8 (E52) 4.9 and BMW 6 Series Convertible (E64) 650i: 1.0 s.

Fuel consumption comparison

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

Chart data table
VehicleValue
BMWZ8 (E52)4.9
14.5 L/100 km
16.2 mpg US
19.5 mpg UK
BMW6 Series Convertible (E64)650i
12.9 L/100 km
18.2 mpg US
21.9 mpg UK

The biggest fuel consumption difference is between BMW 6 Series Convertible (E64) 650i and BMW Z8 (E52) 4.9: 1.6 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
BMWZ8 (E52)4.9
241 hp/t
180 kW/t
4.1 kg/hp
BMW6 Series Convertible (E64)650i
198 hp/t
148 kW/t
5.0 kg/hp

Estimated range comparison

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

Chart data table
VehicleValue
BMWZ8 (E52)4.9
503 km
313 mi
BMW6 Series Convertible (E64)650i
543 km
337 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
BMWZ8 (E52)4.9
400 hp
298 kW
4.7 s
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
BMW6 Series Convertible (E64)650i
367 hp
274 kW
5.7 s
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 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
BMWZ8 (E52)4.9
Power
400 hp
298 kW
0-100 km/h4.7 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Doors/seats
2 doors
2 seats
Trunk
203 L
7.2 cu ft
Length
4,400 mm
173.2 in
Height
1,317 mm
51.9 in
BMW6 Series Convertible (E64)650i
Power
367 hp
274 kW
0-100 km/h5.7 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
4,820 mm
189.8 in
Height
1,373 mm
54.1 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
BMWZ8 (E52)4.9
Power
400 hp
298 kW
0-100 km/h4.7 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
14.5 L/100 km
16.2 mpg US
19.5 mpg UK
BMW6 Series Convertible (E64)650i
Power
367 hp
274 kW
0-100 km/h5.7 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
12.9 L/100 km
18.2 mpg US
21.9 mpg UK

BMW Z8 (E52) 4.9 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
BMWZ8 (E52)4.9
14.5 L/100 km
16.2 mpg US
19.5 mpg UK
4.7 s
BMW6 Series Convertible (E64)650i
12.9 L/100 km
18.2 mpg US
21.9 mpg UK
5.7 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
BMWZ8 (E52)4.9
241 hp/t
180 kW/t
4.2 kg/hp
14.5 L/100 km
16.2 mpg US
19.5 mpg UK
BMW6 Series Convertible (E64)650i
198 hp/t
148 kW/t
5.0 kg/hp
12.9 L/100 km
18.2 mpg US
21.9 mpg UK

Detailed score breakdown

Detailed score breakdown
VehicleBMWZ8 (E52)4.9BMW6 Series Convertible (E64)650i
Power
400 hp
298 kW
367 hp
274 kW
Torque
500 Nm
369 lb-ft
490 Nm
361 lb-ft
Acceleration
4.7 s
5.7 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Lightness
1,660 kg
3,660 lb
1,850 kg
4,079 lb
Fuel consumption
14.5 L/100 km
16.2 mpg US
19.5 mpg UK
12.9 L/100 km
18.2 mpg US
21.9 mpg UK
Practicality
Doors/seats
2 doors
2 seats
Trunk
203 L
7.2 cu ft
Length
4,400 mm
173.2 in
Height
1,317 mm
51.9 in
Doors/seats
2 doors
4 seats
Trunk
300 L
10.6 cu ft
Length
4,820 mm
189.8 in
Height
1,373 mm
54.1 in
Range score
503 km
313 mi
543 km
337 mi
Trunk score
203 L
7.2 cu ft
300 L
10.6 cu ft
Power-to-weight score
241 hp/t
180 kW/t
4.2 kg/hp
198 hp/t
148 kW/t
5.0 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 Z8 (E52) 4.9BMW 6 Series Convertible (E64) 650i
Consumption14.5 L/100 km16.2 mpg US19.5 mpg UK12.9 L/100 km18.2 mpg US21.9 mpg UK
Cost / 100 km25.38 LC100 km22.58 LC100 km
Cost / 100 mi40.84 LC100 mi36.33 LC100 mi
Annual fuel used2,175 L575 US gal478 UK gal1,935 L511 US gal426 UK gal
Annual fuel cost3,806 LC/year3,386 LC/year

Head-to-head comparisons

BMW Z8 (E52) 4.9

  • Has 33 hp more
  • Has 10 Nm more
  • Is 190 kg lighter
  • Is 1.0 s quicker from 0-100 km/h
  • Has 43 hp/t better power-to-weight

Pros

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

Cons

  • Highest combined fuel consumption
  • Smallest trunk

BMW 6 Series Convertible (E64) 650i

  • Uses 1.6 L/100 km less fuel
  • Has 39 km (24 mi) more estimated range
  • Has 97 L more trunk volume

Pros

  • Lowest combined fuel consumption
  • Best estimated range
  • Largest trunk

Cons

  • Slowest 0-100 km/h
  • Lowest power
  • Heaviest

Choose cars to compare

Brand
Model
Generation
Engine or modification
BMW Z8 (E52) 4.9
BMW 6 Series Convertible (E64) 650i
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