Car comparison

Porsche 911 Cabriolet (991) Turbo 3.8vsAston Martin DB9 GT Volante 6.0 V12

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

New comparison

Porsche 911 Cabriolet (991)

Turbo 3.8

520 hp3800 ccGasolineAWDDual-clutchTwin-turboCabriolet / convertible2013-2016

Aston Martin DB9 GT Volante

6.0 V12

547 hp5935 ccGasolineRWDAutomaticNaturally aspiratedCabriolet / convertible2015-2016

Comparison overview

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

Porsche 911 Cabriolet (991) Turbo 3.8

Quickest 0-100 km/h
3.5 s
Fastest top speed
315 km/h
196 mph
Highest torque
660 Nm
487 lb-ft
Lightest
1,665 kg
3,671 lb
Best power-to-weight
312 hp/t
233 kW/t
3.2 kg/hp
Best overall score
76/100
Best performance score
91/100
Best economy score
80/100

Aston Martin DB9 GT Volante 6.0 V12

Most powerful
547 hp
408 kW
Best practicality score
48/100

Specification comparison

Specification comparison
Model	Porsche911 Cabriolet (991)Turbo 3.8	Aston MartinDB9 GT Volante6.0 V12
Power	520hp388kW	547hp408kW
Torque	660Nm487lb-ft	620Nm457lb-ft
Curb weight	1,665kg3,671lb	1,890kg4,167lb
Gross weight	2,045kg4,508lb	-
Top speed	315 km/h 196 mph	295 km/h 183 mph
To 99% top speed	51.1s99% target: 312 km/h / 194 mph Calculated	64.7s99% target: 292 km/h / 181 mph Calculated
0-100 km/h	3.5s	4.5s
0-200 km/h	10.0s Calculated	13.7s Calculated
0-60 mph	3.3s Calculated	4.3s Calculated
Fuel consumption	9.9L/100 km23.8mpg US28.5mpg UK	-
Fuel consumption city	13.4L/100 km17.6mpg US21.1mpg UK	-
Fuel consumption highway	7.8L/100 km30.2mpg US36.2mpg UK	-
Quarter mile	11.2s Calculated	12.4s Calculated
Power-to-weight	312hp/t233kW/t142hp/1000 lb Calculated	289hp/t216kW/t131hp/1000 lb Calculated
Torque-to-weight	396Nm/t265lb-ft/ton Calculated	328Nm/t219lb-ft/ton Calculated
Estimated range	687km427mi Calculated	-
Displacement	3,800cc232cu in	5,935cc362cu in
Length	4,506mm177in	4,720mm186in
Width	1,880mm74in	-
Height	1,292mm51in	1,282mm50in
Wheelbase	2,450mm96in	2,740mm108in
Front track	1,541mm61in	-
Rear track	1,590mm63in	-
Trunk volume	275L	-
Doors	2	2
Seats	4	4
Fuel tank	68L	78L
CO2 emissions	231g/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.

Porsche 911 Cabriolet (991) Turbo 3.8Aston Martin DB9 GT Volante 6.0 V12PowerTorque

Dyno simulation data table
Vehicle	Peak power RPM	Peak torque RPM	Max engine speed
Porsche911 Cabriolet (991)Turbo 3.8	6,000-6,500 rpm	1,950-5,000 rpm	6,750 rpm
Aston MartinDB9 GT Volante6.0 V12	6,750 rpm	5,500 rpm	7,000 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
Metric	Porsche911 Cabriolet (991)Turbo 3.8	Aston MartinDB9 GT Volante6.0 V12
	Acceleration checkpoints
0-60 mph 0-97 km/h	3.3 s	4.3 s
0-100 km/h 0-62 mph	3.5 s	4.5 s
0-200 km/h 0-124 mph	10.0 s	13.7 s
Top speed	315 km/h 196 mph	295 km/h 183 mph
	Drag race simulation
60 ft 18 m	1.9 s	2.1 s
330 ft 101 m	5.0 s	5.5 s
1/8 mile 201 m	7.4 s	8.2 s
1000 ft 305 m	9.4 s	10.5 s
1/4 mile 402 m	11.2 s	12.4 s
Trap speed 1/4 mile 402 m	212 km/h 132 mph	191 km/h 118 mph

Power comparison

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

Chart data table
Vehicle	Value
Porsche911 Cabriolet (991)Turbo 3.8	520 hp 388 kW
Aston MartinDB9 GT Volante6.0 V12	547 hp 408 kW

Aston Martin DB9 GT Volante 6.0 V12 has 27 hp more than Porsche 911 Cabriolet (991) Turbo 3.8.

The biggest power difference is between Porsche 911 Cabriolet (991) Turbo 3.8 and Aston Martin DB9 GT Volante 6.0 V12: 27 hp (20 kW).

Torque comparison

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

Chart data table
Vehicle	Value
Porsche911 Cabriolet (991)Turbo 3.8	660 Nm 487 lb-ft
Aston MartinDB9 GT Volante6.0 V12	620 Nm 457 lb-ft

Curb weight comparison

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

Chart data table
Vehicle	Value
Porsche911 Cabriolet (991)Turbo 3.8	1,665 kg 3,671 lb
Aston MartinDB9 GT Volante6.0 V12	1,890 kg 4,167 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
Porsche911 Cabriolet (991)Turbo 3.8	315 km/h 196 mph
Aston MartinDB9 GT Volante6.0 V12	295 km/h 183 mph

0-100 km/h comparison

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

Chart data table
Vehicle	Value
Porsche911 Cabriolet (991)Turbo 3.8	3.5 s
Aston MartinDB9 GT Volante6.0 V12	4.5 s

Although Aston Martin DB9 GT Volante 6.0 V12 has more power, Porsche 911 Cabriolet (991) Turbo 3.8 is quicker from 0-100 km/h.

The biggest 0-100 km/h difference is between Porsche 911 Cabriolet (991) Turbo 3.8 and Aston Martin DB9 GT Volante 6.0 V12: 1.0 s.

Power-to-weight comparison

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

Chart data table
Vehicle	Value
Porsche911 Cabriolet (991)Turbo 3.8	312 hp/t 233 kW/t 3.2 kg/hp
Aston MartinDB9 GT Volante6.0 V12	289 hp/t 216 kW/t 3.5 kg/hp

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
Vehicle	Power	Acceleration	Top speed
Porsche911 Cabriolet (991)Turbo 3.8	520 hp 388 kW	3.5 s	315 km/h 196 mph
Aston MartinDB9 GT Volante6.0 V12	547 hp 408 kW	4.5 s	295 km/h 183 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

Porsche911 Cabriolet (991)Turbo 3.8

Power	520 hp 388 kW
0-100 km/h	3.5 s
Top speed 315 km/h 196 mph

Doors/seats	2 doors 4 seats
Trunk	275 L 9.7 cu ft
Length	4,506 mm 177.4 in
Height	1,292 mm 50.9 in

Aston MartinDB9 GT Volante6.0 V12

Power	547 hp 408 kW
0-100 km/h	4.5 s
Top speed 295 km/h 183 mph

Doors/seats	2 doors 4 seats
Trunk	-
Length	4,720 mm 185.8 in
Height	1,282 mm 50.5 in

Detailed score breakdown

Vehicle

Porsche911 Cabriolet (991)Turbo 3.8

Aston MartinDB9 GT Volante6.0 V12

Power

520 hp

388 kW

547 hp

408 kW

Torque

660 Nm

487 lb-ft

620 Nm

457 lb-ft

Acceleration

3.5 s

4.5 s

Top speed

315 km/h

196 mph

295 km/h

183 mph

Lightness

1,665 kg

3,671 lb

1,890 kg

4,167 lb

Fuel consumption

9.9 L/100 km

23.8 mpg US

28.5 mpg UK

Practicality

Doors/seats	2 doors 4 seats
Trunk	275 L 9.7 cu ft
Length	4,506 mm 177.4 in
Height	1,292 mm 50.9 in

Doors/seats	2 doors 4 seats
Trunk	-
Length	4,720 mm 185.8 in
Height	1,282 mm 50.5 in

Range score

687 km

427 mi

CO2 score

231 g/km

Trunk score

275 L

9.7 cu ft

Power-to-weight score

312 hp/t

233 kW/t

3.2 kg/hp

289 hp/t

216 kW/t

3.5 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	Porsche 911 Cabriolet (991) Turbo 3.8
Consumption	9.9 L/100 km23.8 mpg US28.5 mpg UK
Cost / 100 km	17.33 LC100 km
Cost / 100 mi	27.88 LC100 mi
Annual fuel used	1,485 L392 US gal327 UK gal
Annual fuel cost	2,599 LC/year