Car comparison

Porsche 911 (991 II) GT3 RS 4.0vsPorsche 718 Cayman (982) GT4 RS 4.0

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

New comparison

Porsche 911 (991 II)

GT3 RS 4.0

520 hp3996 ccGasolineRWDDual-clutchNaturally aspiratedCoupe2018-2019
VS

Porsche 718 Cayman (982)

GT4 RS 4.0

493 hp3996 ccGasolineRWDDual-clutchNaturally aspiratedCoupe2022-present

Comparison overview

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

Best choices

Porsche 911 (991 II) GT3 RS 4.0

  • Quickest 0-100 km/h
    3.2 s
  • Fastest top speed
    325 km/h
    202 mph Unrestricted
    312 km/h
    194 mph Restricted
  • Most powerful
    520 hp
    388 kW
  • Highest torque
    470 Nm
    347 lb-ft
  • Lightest
    1,430 kg
    3,153 lb
  • Best power-to-weight
    364 hp/t
    271 kW/t
    2.8 kg/hp
  • Best performance score
    89/100

Porsche 718 Cayman (982) GT4 RS 4.0

  • Lowest combined fuel consumption
    12.3 L/100 km
    19.1 mpg US
    23.0 mpg UK
  • Best estimated range
    520 km
    323 mi
  • Largest trunk
    136 L
  • Best overall score
    72/100
  • Best economy score
    74/100
  • Best practicality score
    39/100

Specification comparison

Specification comparison
ModelPorsche911 (991 II)GT3 RS 4.0Porsche718 Cayman (982)GT4 RS 4.0
Power
520hp388kW
493hp368kW
Torque
470Nm347lb-ft
449Nm331lb-ft
Curb weight
1,430kg3,153lb
1,464kg3,228lb
Gross weight
1,793kg3,953lb
1,771kg3,904lb
Top speed
Unrestricted
325 km/h202 mph
Restricted
312 km/h194 mph
Calculated
315 km/h
196 mph
To 99% top speed
45.6s99% target: 322 km/h / 200 mph
Calculated
48.6s99% target: 312 km/h / 194 mph
Calculated
0-100 km/h
3.2s
3.4s
0-200 km/h
8.7s
Calculated
9.6s
Calculated
0-60 mph
3.1s
Calculated
3.3s
Calculated
Fuel consumption
12.8L/100 km18.4mpg US22.1mpg UK
12.3L/100 km19.1mpg US23.0mpg UK
Fuel consumption city
19.2L/100 km12.3mpg US14.7mpg UK
-
Fuel consumption highway
9L/100 km26.1mpg US31.4mpg UK
-
Quarter mile
10.7s
Calculated
11.0s
Calculated
Power-to-weight
364hp/t271kW/t165hp/1000 lb
Calculated
337hp/t251kW/t153hp/1000 lb
Calculated
Torque-to-weight
329Nm/t220lb-ft/ton
Calculated
307Nm/t205lb-ft/ton
Calculated
Estimated range
500km311mi
Calculated
520km323mi
Calculated
Displacement
3,996cc244cu in
3,996cc244cu in
Length
4,557mm179in
4,455mm175in
Width
1,880mm74in
1,822mm72in
Height
1,297mm51in
1,267mm50in
Wheelbase
2,453mm97in
2,484mm98in
Front track
1,588mm63in
-
Rear track
1,557mm61in
-
Ground clearance-
102mm4in
Trunk volume
125L
-
Max trunk volume-
136L
Doors
2
2
Seats
2
2
Fuel tank
64L
64L
CO2 emissions
291g/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 (991 II) GT3 RS 4.0Porsche 718 Cayman (982) GT4 RS 4.0PowerTorque
  • Porsche 911 (991 II) GT3 RS 4.0: Power / Torque
  • Porsche 718 Cayman (982) GT4 RS 4.0: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
Porsche911 (991 II)GT3 RS 4.08,250 rpm6,000 rpm9,000 rpm
Porsche718 Cayman (982)GT4 RS 4.08,400 rpm6,250 rpm9,000 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricPorsche911 (991 II)GT3 RS 4.0Porsche718 Cayman (982)GT4 RS 4.0
Acceleration checkpoints
0-60 mph
0-97 km/h
3.1 s
3.3 s
0-100 km/h
0-62 mph
3.2 s
3.4 s
0-200 km/h
0-124 mph
8.7 s
9.6 s
0-200 mph
0-322 km/h
46.0 s
-
Top speed
Unrestricted
325 km/h202 mph
Restricted
312 km/h194 mph
Likely limited
315 km/h
196 mph
Drag race simulation
60 ft
18 m
1.9 s
1.9 s
330 ft
101 m
4.8 s
4.9 s
1/8 mile
201 m
7.1 s
7.3 s
1000 ft
305 m
9.1 s
9.3 s
1/4 mile
402 m
10.7 s
11.0 s
Trap speed
1/4 mile
402 m
223 km/h
139 mph
215 km/h
134 mph

Power comparison

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

Chart data table
VehicleValue
Porsche911 (991 II)GT3 RS 4.0
520 hp
388 kW
Porsche718 Cayman (982)GT4 RS 4.0
493 hp
368 kW

Porsche 911 (991 II) GT3 RS 4.0 has 27 hp more than Porsche 718 Cayman (982) GT4 RS 4.0.

The biggest power difference is between Porsche 718 Cayman (982) GT4 RS 4.0 and Porsche 911 (991 II) GT3 RS 4.0: 27 hp (20 kW).

Torque comparison

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

Chart data table
VehicleValue
Porsche911 (991 II)GT3 RS 4.0
470 Nm
347 lb-ft
Porsche718 Cayman (982)GT4 RS 4.0
449 Nm
331 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
Porsche911 (991 II)GT3 RS 4.0
1,430 kg
3,153 lb
Porsche718 Cayman (982)GT4 RS 4.0
1,464 kg
3,228 lb

Top speed without limiter comparison

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

Chart data table
VehicleValue
Porsche911 (991 II)GT3 RS 4.0
Unrestricted
325 km/h202 mph
Restricted
312 km/h194 mph
Porsche718 Cayman (982)GT4 RS 4.0
315 km/h
196 mph

0-100 km/h comparison

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

Chart data table
VehicleValue
Porsche911 (991 II)GT3 RS 4.03.2 s
Porsche718 Cayman (982)GT4 RS 4.03.4 s

The biggest 0-100 km/h difference is between Porsche 911 (991 II) GT3 RS 4.0 and Porsche 718 Cayman (982) GT4 RS 4.0: 0.2 s.

Fuel consumption comparison

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

Chart data table
VehicleValue
Porsche911 (991 II)GT3 RS 4.0
12.8 L/100 km
18.4 mpg US
22.1 mpg UK
Porsche718 Cayman (982)GT4 RS 4.0
12.3 L/100 km
19.1 mpg US
23.0 mpg UK

The biggest fuel consumption difference is between Porsche 718 Cayman (982) GT4 RS 4.0 and Porsche 911 (991 II) GT3 RS 4.0: 0.5 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
Porsche911 (991 II)GT3 RS 4.0
364 hp/t
271 kW/t
2.7 kg/hp
Porsche718 Cayman (982)GT4 RS 4.0
337 hp/t
251 kW/t
3.0 kg/hp

Estimated range comparison

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

Chart data table
VehicleValue
Porsche911 (991 II)GT3 RS 4.0
500 km
311 mi
Porsche718 Cayman (982)GT4 RS 4.0
520 km
323 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
Porsche911 (991 II)GT3 RS 4.0
520 hp
388 kW
3.2 s
Unrestricted
325 km/h202 mph
Restricted
312 km/h194 mph
Porsche718 Cayman (982)GT4 RS 4.0
493 hp
368 kW
3.4 s
315 km/h
196 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
Porsche911 (991 II)GT3 RS 4.0
Power
520 hp
388 kW
0-100 km/h3.2 s
Top speed
Unrestricted
325 km/h202 mph
Restricted
312 km/h194 mph
Doors/seats
2 doors
2 seats
Trunk
125 L
4.4 cu ft
Length
4,557 mm
179.4 in
Height
1,297 mm
51.1 in
Porsche718 Cayman (982)GT4 RS 4.0
Power
493 hp
368 kW
0-100 km/h3.4 s
Top speed
315 km/h
196 mph
Doors/seats
2 doors
2 seats
Trunk
136 L
4.8 cu ft
Length
4,455 mm
175.4 in
Height
1,267 mm
49.9 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
Porsche911 (991 II)GT3 RS 4.0
Power
520 hp
388 kW
0-100 km/h3.2 s
Top speed
Unrestricted
325 km/h202 mph
Restricted
312 km/h194 mph
12.8 L/100 km
18.4 mpg US
22.1 mpg UK
Porsche718 Cayman (982)GT4 RS 4.0
Power
493 hp
368 kW
0-100 km/h3.4 s
Top speed
315 km/h
196 mph
12.3 L/100 km
19.1 mpg US
23.0 mpg UK

Porsche 718 Cayman (982) GT4 RS 4.0 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
Porsche911 (991 II)GT3 RS 4.0
12.8 L/100 km
18.4 mpg US
22.1 mpg UK
3.2 s
Porsche718 Cayman (982)GT4 RS 4.0
12.3 L/100 km
19.1 mpg US
23.0 mpg UK
3.4 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
VehiclePower-to-weight, hp/tFuel consumption, L/100 km
Porsche911 (991 II)GT3 RS 4.0
364 hp/t
271 kW/t
2.8 kg/hp
12.8 L/100 km
18.4 mpg US
22.1 mpg UK
Porsche718 Cayman (982)GT4 RS 4.0
337 hp/t
251 kW/t
3.0 kg/hp
12.3 L/100 km
19.1 mpg US
23.0 mpg UK

Detailed score breakdown

Detailed score breakdown
VehiclePorsche911 (991 II)GT3 RS 4.0Porsche718 Cayman (982)GT4 RS 4.0
Power
520 hp
388 kW
493 hp
368 kW
Torque
470 Nm
347 lb-ft
449 Nm
331 lb-ft
Acceleration
3.2 s
3.4 s
Top speed
Unrestricted
325 km/h202 mph
Restricted
312 km/h194 mph
315 km/h
196 mph
Lightness
1,430 kg
3,153 lb
1,464 kg
3,228 lb
Fuel consumption
12.8 L/100 km
18.4 mpg US
22.1 mpg UK
12.3 L/100 km
19.1 mpg US
23.0 mpg UK
Practicality
Doors/seats
2 doors
2 seats
Trunk
125 L
4.4 cu ft
Length
4,557 mm
179.4 in
Height
1,297 mm
51.1 in
Doors/seats
2 doors
2 seats
Trunk
136 L
4.8 cu ft
Length
4,455 mm
175.4 in
Height
1,267 mm
49.9 in
Range score
500 km
311 mi
520 km
323 mi
CO2 score
291 g/km
-
Trunk score
125 L
4.4 cu ft
136 L
4.8 cu ft
Power-to-weight score
364 hp/t
271 kW/t
2.8 kg/hp
337 hp/t
251 kW/t
3.0 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
VehiclePorsche 911 (991 II) GT3 RS 4.0Porsche 718 Cayman (982) GT4 RS 4.0
Consumption12.8 L/100 km18.4 mpg US22.1 mpg UK12.3 L/100 km19.1 mpg US23 mpg UK
Cost / 100 km22.40 LC100 km21.53 LC100 km
Cost / 100 mi36.05 LC100 mi34.64 LC100 mi
Annual fuel used1,920 L507 US gal422 UK gal1,845 L487 US gal406 UK gal
Annual fuel cost3,360 LC/year3,229 LC/year

Head-to-head comparisons

Porsche 911 (991 II) GT3 RS 4.0

  • Has 27 hp more
  • Has 21 Nm more
  • Is 34 kg lighter
  • Is 0.2 s quicker from 0-100 km/h
  • Has 10 km/h (6 mph) higher top speed
  • Has 27 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

Porsche 718 Cayman (982) GT4 RS 4.0

  • Uses 0.5 L/100 km less fuel
  • Has 20 km (13 mi) more estimated range
  • Has 11 L more trunk volume

Pros

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

Cons

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

Choose cars to compare

Brand
Model
Generation
Engine or modification
Porsche 911 (991 II) GT3 RS 4.0
Porsche 718 Cayman (982) GT4 RS 4.0
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