Car comparison

AC Ace 3.5 i V8 32V TurbovsBMW 6 Series Convertible (E64) 645Ci

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

New comparison

AC Ace

3.5 i V8 32V Turbo

354 hp3506 ccGasolineRWDManualTurbochargedCabriolet / convertible1999-2000
VS

BMW 6 Series Convertible (E64)

645Ci

333 hp4398 ccGasolineRWDManualNaturally aspiratedCabriolet / convertible2003-2005

Comparison overview

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

Best choices

AC Ace 3.5 i V8 32V Turbo

  • Quickest 0-100 km/h
    5.5 s
  • Fastest top speed
    260 km/h
    162 mph Unrestricted
    250 km/h
    155 mph Restricted
  • Most powerful
    354 hp
    264 kW
  • Lightest
    1,510 kg
    3,329 lb
  • Best power-to-weight
    234 hp/t
    175 kW/t
    4.3 kg/hp
  • Lowest highway consumption
    9.0 L/100 km
    26.1 mpg US
    31.4 mpg UK
  • Best performance score
    68/100

BMW 6 Series Convertible (E64) 645Ci

  • Highest torque
    450 Nm
    332 lb-ft
  • Lowest city consumption
    18.5 L/100 km
    12.7 mpg US
    15.3 mpg UK
  • Largest trunk
    300 L
  • Best overall score
    59/100
  • Best economy score
    72/100
  • Best practicality score
    45/100

Specification comparison

Specification comparison
ModelACAce3.5 i V8 32V TurboBMW6 Series Convertible (E64)645Ci
Power
354hp264kW
333hp248kW
Torque
407Nm300lb-ft
450Nm332lb-ft
Curb weight
1,510kg3,329lb
1,815kg4,001lb
Gross weight-
2,215kg4,883lb
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
69.8s99% target: 257 km/h / 160 mph
Calculated
87.6s99% target: 257 km/h / 160 mph
Calculated
0-100 km/h
5.5s
6.1s
0-200 km/h
19.2s
Calculated
22.6s
Calculated
0-60 mph
5.2s
Calculated
5.8s
Calculated
Fuel consumption-
12.9L/100 km18.2mpg US21.9mpg UK
Fuel consumption city
20L/100 km11.8mpg US14.1mpg UK
18.5L/100 km12.7mpg US15.3mpg UK
Fuel consumption highway
9L/100 km26.1mpg US31.4mpg UK
9.6L/100 km24.5mpg US29.4mpg UK
Quarter mile
13.6s
Calculated
14.2s
Calculated
Power-to-weight
234hp/t175kW/t106hp/1000 lb
Calculated
183hp/t137kW/t83hp/1000 lb
Calculated
Torque-to-weight
270Nm/t180lb-ft/ton
Calculated
248Nm/t166lb-ft/ton
Calculated
Estimated range-
543km337mi
Calculated
Displacement
3,506cc214cu in
4,398cc268cu in
Length
4,420mm174in
4,820mm190in
Width
1,870mm74in
1,855mm73in
Height
1,300mm51in
1,373mm54in
Wheelbase
2,470mm97in
2,780mm109in
Front track
1,590mm63in
1,558mm61in
Rear track
1,570mm62in
1,592mm63in
Trunk volume
185L
300L
Max trunk volume
300L
350L
Doors
2
2
Seats
2
4
Fuel tank
90L
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.

AC Ace 3.5 i V8 32V TurboBMW 6 Series Convertible (E64) 645CiPowerTorque
  • AC Ace 3.5 i V8 32V Turbo: Power / Torque
  • BMW 6 Series Convertible (E64) 645Ci: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
ACAce3.5 i V8 32V Turbo6,500 rpm4,000 rpm6,750 rpm
BMW6 Series Convertible (E64)645Ci6,100 rpm3,600 rpm6,350 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricACAce3.5 i V8 32V TurboBMW6 Series Convertible (E64)645Ci
Acceleration checkpoints
0-60 mph
0-97 km/h
5.2 s
5.8 s
0-100 km/h
0-62 mph
5.5 s
6.1 s
0-200 km/h
0-124 mph
19.2 s
22.6 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
2.3 s
2.3 s
330 ft
101 m
6.0 s
6.2 s
1/8 mile
201 m
8.9 s
9.3 s
1000 ft
305 m
11.5 s
12.0 s
1/4 mile
402 m
13.6 s
14.2 s
Trap speed
1/4 mile
402 m
172 km/h
107 mph
163 km/h
102 mph

Power comparison

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

Chart data table
VehicleValue
ACAce3.5 i V8 32V Turbo
354 hp
264 kW
BMW6 Series Convertible (E64)645Ci
333 hp
248 kW

AC Ace 3.5 i V8 32V Turbo has 21 hp more than BMW 6 Series Convertible (E64) 645Ci.

The biggest power difference is between BMW 6 Series Convertible (E64) 645Ci and AC Ace 3.5 i V8 32V Turbo: 21 hp (16 kW).

Torque comparison

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

Chart data table
VehicleValue
ACAce3.5 i V8 32V Turbo
407 Nm
300 lb-ft
BMW6 Series Convertible (E64)645Ci
450 Nm
332 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
ACAce3.5 i V8 32V Turbo
1,510 kg
3,329 lb
BMW6 Series Convertible (E64)645Ci
1,815 kg
4,001 lb

Top speed without limiter comparison

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

Chart data table
VehicleValue
ACAce3.5 i V8 32V Turbo
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
BMW6 Series Convertible (E64)645Ci
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
ACAce3.5 i V8 32V Turbo5.5 s
BMW6 Series Convertible (E64)645Ci6.1 s

The biggest 0-100 km/h difference is between AC Ace 3.5 i V8 32V Turbo and BMW 6 Series Convertible (E64) 645Ci: 0.6 s.

Power-to-weight comparison

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

Chart data table
VehicleValue
ACAce3.5 i V8 32V Turbo
234 hp/t
175 kW/t
4.3 kg/hp
BMW6 Series Convertible (E64)645Ci
183 hp/t
137 kW/t
5.5 kg/hp

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
ACAce3.5 i V8 32V Turbo
354 hp
264 kW
5.5 s
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
BMW6 Series Convertible (E64)645Ci
333 hp
248 kW
6.1 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
ACAce3.5 i V8 32V Turbo
Power
354 hp
264 kW
0-100 km/h5.5 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Doors/seats
2 doors
2 seats
Trunk
185 L
6.5 cu ft
Length
4,420 mm
174.0 in
Height
1,300 mm
51.2 in
BMW6 Series Convertible (E64)645Ci
Power
333 hp
248 kW
0-100 km/h6.1 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

Detailed score breakdown

Detailed score breakdown
VehicleACAce3.5 i V8 32V TurboBMW6 Series Convertible (E64)645Ci
Power
354 hp
264 kW
333 hp
248 kW
Torque
407 Nm
300 lb-ft
450 Nm
332 lb-ft
Acceleration
5.5 s
6.1 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Lightness
1,510 kg
3,329 lb
1,815 kg
4,001 lb
Fuel consumption
-
12.9 L/100 km
18.2 mpg US
21.9 mpg UK
Practicality
Doors/seats
2 doors
2 seats
Trunk
185 L
6.5 cu ft
Length
4,420 mm
174.0 in
Height
1,300 mm
51.2 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
-
543 km
337 mi
Trunk score
185 L
6.5 cu ft
300 L
10.6 cu ft
Power-to-weight score
234 hp/t
175 kW/t
4.3 kg/hp
183 hp/t
137 kW/t
5.5 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 (E64) 645Ci
Consumption12.9 L/100 km18.2 mpg US21.9 mpg UK
Cost / 100 km22.58 LC100 km
Cost / 100 mi36.33 LC100 mi
Annual fuel used1,935 L511 US gal426 UK gal
Annual fuel cost3,386 LC/year

Head-to-head comparisons

AC Ace 3.5 i V8 32V Turbo

  • Has 21 hp more
  • Is 305 kg lighter
  • Is 0.6 s quicker from 0-100 km/h
  • Has 51 hp/t better power-to-weight

Pros

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

Cons

  • Smallest trunk

Choose cars to compare

Brand
Model
Generation
Engine or modification
AC Ace 3.5 i V8 32V Turbo
BMW 6 Series Convertible (E64) 645Ci
Compare selected cars
2 vehicles selected

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