Car comparison

Porsche 718 Cayman (982) S 2.5vsBMW 8 Series (G15) 840i

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

New comparison

Porsche 718 Cayman (982)

S 2.5

350 hp2497 ccGasolineRWDManualTurbochargedCoupe2019-2020
VS

BMW 8 Series (G15)

840i

340 hp2998 ccGasolineRWDAutomaticTurbochargedCoupe2019-2020

Comparison overview

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

Best choices

BMW 8 Series (G15) 840i

  • Highest torque
    500 Nm
    369 lb-ft
  • Lowest combined fuel consumption
    7.3 L/100 km
    32.2 mpg US
    38.7 mpg UK
  • Lowest city consumption
    9.0 L/100 km
    26.1 mpg US
    31.4 mpg UK
  • Lowest highway consumption
    6.3 L/100 km
    37.3 mpg US
    44.8 mpg UK
  • Best estimated range
    932 km
    579 mi
  • Largest trunk
    420 L
  • Best overall score
    65/100
  • Best economy score
    87/100
  • Best practicality score
    52/100

Porsche 718 Cayman (982) S 2.5

  • Quickest 0-100 km/h
    4.9 s
  • Fastest top speed
    285 km/h
    177 mph
  • Most powerful
    350 hp
    261 kW
  • Lightest
    1,355 kg
    2,987 lb
  • Best power-to-weight
    258 hp/t
    193 kW/t
    3.9 kg/hp
  • Best performance score
    73/100

Specification comparison

Specification comparison
ModelPorsche718 Cayman (982)S 2.5BMW8 Series (G15)840i
Power
350hp261kW
340hp254kW
Torque
420Nm310lb-ft
500Nm369lb-ft
Curb weight
1,355kg2,987lb
1,710kg3,770lb
Gross weight
1,665kg3,671lb
2,225kg4,905lb
Top speed
285 km/h
177 mph
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Calculated
To 99% top speed
66.1s99% target: 282 km/h / 175 mph
Calculated
69.0s99% target: 262 km/h / 163 mph
Calculated
0-100 km/h
4.9s
5.0s
0-200 km/h
15.2s
Calculated
17.5s
Calculated
0-60 mph
4.7s
Calculated
4.8s
Calculated
Fuel consumption
9.2L/100 km25.6mpg US30.7mpg UK
7.3L/100 km32.2mpg US38.7mpg UK
Fuel consumption city
12.7L/100 km18.5mpg US22.2mpg UK
9L/100 km26.1mpg US31.4mpg UK
Fuel consumption highway
7.1L/100 km33.1mpg US39.8mpg UK
6.3L/100 km37.3mpg US44.8mpg UK
Quarter mile
12.9s
Calculated
13.1s
Calculated
Power-to-weight
258hp/t193kW/t117hp/1000 lb
Calculated
199hp/t148kW/t90hp/1000 lb
Calculated
Torque-to-weight
310Nm/t207lb-ft/ton
Calculated
292Nm/t196lb-ft/ton
Calculated
Estimated range
696km432mi
Calculated
932km579mi
Calculated
Displacement
2,497cc152cu in
2,998cc183cu in
Length
4,379mm172in
4,843mm191in
Width
1,801mm71in
1,902mm75in
Height
1,295mm51in
1,341mm53in
Wheelbase
2,475mm97in
2,822mm111in
Front track
1,515mm60in
1,627mm64in
Rear track
1,539mm61in
1,642mm65in
Ground clearance-
121mm5in
Trunk volume-
420L
Max trunk volume
150L
-
Doors
2
2
Seats
2
4
Fuel tank
64L
68L
CO2 emissions
210g/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 718 Cayman (982) S 2.5BMW 8 Series (G15) 840iPowerTorque
  • Porsche 718 Cayman (982) S 2.5: Power / Torque
  • BMW 8 Series (G15) 840i: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
Porsche718 Cayman (982)S 2.56,500 rpm2,100-4,500 rpm6,750 rpm
BMW8 Series (G15)840i5,000-6,500 rpm1,600-4,500 rpm6,750 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricPorsche718 Cayman (982)S 2.5BMW8 Series (G15)840i
Acceleration checkpoints
0-60 mph
0-97 km/h
4.7 s
4.8 s
0-100 km/h
0-62 mph
4.9 s
5.0 s
0-200 km/h
0-124 mph
15.2 s
17.5 s
Top speed
285 km/h
177 mph
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Likely limited
Drag race simulation
60 ft
18 m
2.2 s
2.2 s
330 ft
101 m
5.7 s
5.7 s
1/8 mile
201 m
8.5 s
8.6 s
1000 ft
305 m
10.9 s
11.1 s
1/4 mile
402 m
12.9 s
13.1 s
Trap speed
1/4 mile
402 m
184 km/h
115 mph
176 km/h
109 mph

Power comparison

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

Chart data table
VehicleValue
Porsche718 Cayman (982)S 2.5
350 hp
261 kW
BMW8 Series (G15)840i
340 hp
254 kW

Porsche 718 Cayman (982) S 2.5 has 10 hp more than BMW 8 Series (G15) 840i.

The biggest power difference is between BMW 8 Series (G15) 840i and Porsche 718 Cayman (982) S 2.5: 10 hp (7 kW).

Torque comparison

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

Chart data table
VehicleValue
Porsche718 Cayman (982)S 2.5
420 Nm
310 lb-ft
BMW8 Series (G15)840i
500 Nm
369 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
Porsche718 Cayman (982)S 2.5
1,355 kg
2,987 lb
BMW8 Series (G15)840i
1,710 kg
3,770 lb

Top speed without limiter comparison

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

Chart data table
VehicleValue
Porsche718 Cayman (982)S 2.5
285 km/h
177 mph
BMW8 Series (G15)840i
Unrestricted
265 km/h165 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
Porsche718 Cayman (982)S 2.54.9 s
BMW8 Series (G15)840i5.0 s

The biggest 0-100 km/h difference is between Porsche 718 Cayman (982) S 2.5 and BMW 8 Series (G15) 840i: 0.1 s.

Fuel consumption comparison

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

Chart data table
VehicleValue
Porsche718 Cayman (982)S 2.5
9.2 L/100 km
25.6 mpg US
30.7 mpg UK
BMW8 Series (G15)840i
7.3 L/100 km
32.2 mpg US
38.7 mpg UK

The biggest fuel consumption difference is between BMW 8 Series (G15) 840i and Porsche 718 Cayman (982) S 2.5: 1.9 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
Porsche718 Cayman (982)S 2.5
258 hp/t
193 kW/t
3.9 kg/hp
BMW8 Series (G15)840i
199 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
Porsche718 Cayman (982)S 2.5
696 km
432 mi
BMW8 Series (G15)840i
932 km
579 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
Porsche718 Cayman (982)S 2.5
350 hp
261 kW
4.9 s
285 km/h
177 mph
BMW8 Series (G15)840i
340 hp
254 kW
5.0 s
Unrestricted
265 km/h165 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
Porsche718 Cayman (982)S 2.5
Power
350 hp
261 kW
0-100 km/h4.9 s
Top speed
285 km/h
177 mph
Doors/seats
2 doors
2 seats
Trunk
150 L
5.3 cu ft
Length
4,379 mm
172.4 in
Height
1,295 mm
51.0 in
BMW8 Series (G15)840i
Power
340 hp
254 kW
0-100 km/h5.0 s
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Doors/seats
2 doors
4 seats
Trunk
420 L
14.8 cu ft
Length
4,843 mm
190.7 in
Height
1,341 mm
52.8 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
Porsche718 Cayman (982)S 2.5
Power
350 hp
261 kW
0-100 km/h4.9 s
Top speed
285 km/h
177 mph
9.2 L/100 km
25.6 mpg US
30.7 mpg UK
BMW8 Series (G15)840i
Power
340 hp
254 kW
0-100 km/h5.0 s
Top speed
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
7.3 L/100 km
32.2 mpg US
38.7 mpg UK

BMW 8 Series (G15) 840i 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
Porsche718 Cayman (982)S 2.5
9.2 L/100 km
25.6 mpg US
30.7 mpg UK
4.9 s
BMW8 Series (G15)840i
7.3 L/100 km
32.2 mpg US
38.7 mpg UK
5.0 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
Porsche718 Cayman (982)S 2.5
258 hp/t
193 kW/t
3.9 kg/hp
9.2 L/100 km
25.6 mpg US
30.7 mpg UK
BMW8 Series (G15)840i
199 hp/t
148 kW/t
5.0 kg/hp
7.3 L/100 km
32.2 mpg US
38.7 mpg UK

Detailed score breakdown

Detailed score breakdown
VehiclePorsche718 Cayman (982)S 2.5BMW8 Series (G15)840i
Power
350 hp
261 kW
340 hp
254 kW
Torque
420 Nm
310 lb-ft
500 Nm
369 lb-ft
Acceleration
4.9 s
5.0 s
Top speed
285 km/h
177 mph
Unrestricted
265 km/h165 mph
Restricted
250 km/h155 mph
Lightness
1,355 kg
2,987 lb
1,710 kg
3,770 lb
Fuel consumption
9.2 L/100 km
25.6 mpg US
30.7 mpg UK
7.3 L/100 km
32.2 mpg US
38.7 mpg UK
Practicality
Doors/seats
2 doors
2 seats
Trunk
150 L
5.3 cu ft
Length
4,379 mm
172.4 in
Height
1,295 mm
51.0 in
Doors/seats
2 doors
4 seats
Trunk
420 L
14.8 cu ft
Length
4,843 mm
190.7 in
Height
1,341 mm
52.8 in
Range score
696 km
432 mi
932 km
579 mi
CO2 score
210 g/km
-
Trunk score
150 L
5.3 cu ft
420 L
14.8 cu ft
Power-to-weight score
258 hp/t
193 kW/t
3.9 kg/hp
199 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
VehiclePorsche 718 Cayman (982) S 2.5BMW 8 Series (G15) 840i
Consumption9.2 L/100 km25.6 mpg US30.7 mpg UK7.3 L/100 km32.2 mpg US38.7 mpg UK
Cost / 100 km16.10 LC100 km12.78 LC100 km
Cost / 100 mi25.91 LC100 mi20.56 LC100 mi
Annual fuel used1,380 L365 US gal304 UK gal1,095 L289 US gal241 UK gal
Annual fuel cost2,415 LC/year1,916 LC/year

Head-to-head comparisons

Porsche 718 Cayman (982) S 2.5

  • Has 10 hp more
  • Is 355 kg lighter
  • Is 0.1 s quicker from 0-100 km/h
  • Has 20 km/h (12 mph) higher top speed
  • Has 59 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

  • Highest combined fuel consumption
  • Smallest trunk

BMW 8 Series (G15) 840i

  • Has 80 Nm more
  • Uses 1.9 L/100 km less fuel
  • Has 236 km (147 mi) more estimated range
  • Has 270 L more trunk volume

Pros

  • Highest torque
  • 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 718 Cayman (982) S 2.5
BMW 8 Series (G15) 840i
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