Car comparison

Porsche Boxster (987) · Facelift 2009 2.9vsBMW Z4 (E89) 28i

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

New comparison

Porsche Boxster (987) · Facelift 2009

2.9

255 hp2893 ccGasolineRWDManualNaturally aspiratedRoadster2009-2012
VS

BMW Z4 (E89)

28i

245 hp1997 ccGasolineRWDAutomaticTurbochargedRoadster2011-2013

Comparison overview

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

Best choices

BMW Z4 (E89) 28i

  • Quickest 0-100 km/h
    5.5 s
  • Highest torque
    350 Nm
    258 lb-ft
  • Lowest combined fuel consumption
    6.8 L/100 km
    34.6 mpg US
    41.5 mpg UK
  • Lowest city consumption
    9.4 L/100 km
    25.0 mpg US
    30.1 mpg UK
  • Lowest highway consumption
    5.3 L/100 km
    44.4 mpg US
    53.3 mpg UK
  • Lowest CO2 emissions
    159 g/km
  • Best estimated range
    809 km
    503 mi
  • Best overall score
    52/100
  • Best economy score
    89/100
  • Best practicality score
    32/100

Specification comparison

Specification comparison
ModelPorscheBoxster (987)Facelift 20092.9BMWZ4 (E89)28i
Power
255hp190kW
245hp183kW
Torque
290Nm214lb-ft
350Nm258lb-ft
Curb weight
1,335kg2,943lb
1,495kg3,296lb
Gross weight
1,635kg3,605lb
1,750kg3,858lb
Top speed
263 km/h
163 mph
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Calculated
To 99% top speed
92.4s99% target: 260 km/h / 162 mph
Calculated
73.0s99% target: 257 km/h / 160 mph
Calculated
0-100 km/h
5.9s
5.5s
0-200 km/h
22.3s
19.6s
Calculated
0-60 mph
5.6s
Calculated
5.2s
Calculated
Fuel consumption
9.4L/100 km25mpg US30.1mpg UK
6.8L/100 km34.6mpg US41.5mpg UK
Fuel consumption city
13.8L/100 km17mpg US20.5mpg UK
9.4L/100 km25mpg US30.1mpg UK
Fuel consumption highway
6.9L/100 km34.1mpg US40.9mpg UK
5.3L/100 km44.4mpg US53.3mpg UK
Quarter mile
14.0s
Calculated
13.6s
Calculated
Power-to-weight
191hp/t142kW/t87hp/1000 lb
Calculated
164hp/t122kW/t74hp/1000 lb
Calculated
Torque-to-weight
217Nm/t145lb-ft/ton
Calculated
234Nm/t157lb-ft/ton
Calculated
Estimated range
691km430mi
Calculated
809km503mi
Calculated
Displacement
2,893cc177cu in
1,997cc122cu in
Length
4,342mm171in
4,239mm167in
Width
1,801mm71in
1,790mm70in
Height
1,292mm51in
1,291mm51in
Wheelbase
2,415mm95in
2,496mm98in
Front track
1,490mm59in
1,511mm59in
Rear track
1,534mm60in
1,559mm61in
Ground clearance
127mm5in
-
Trunk volume
130L
-
Doors
2
2
Seats
2
2
Fuel tank
65L
55L
CO2 emissions
221g/km
159g/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 Boxster (987) Facelift 2009 2.9BMW Z4 (E89) 28iPowerTorque
  • Porsche Boxster (987) Facelift 2009 2.9: Power / Torque
  • BMW Z4 (E89) 28i: Power / Torque
Dyno simulation data table
VehiclePeak power RPMPeak torque RPMMax engine speed
PorscheBoxster (987)Facelift 20092.97,200 rpm4,400-6,000 rpm7,500 rpm
BMWZ4 (E89)28i5,000-6,500 rpm1,250-4,800 rpm6,750 rpm

Acceleration curve

Estimated speed over time for selected vehicles.

Acceleration and drag-race table
MetricPorscheBoxster (987)Facelift 20092.9BMWZ4 (E89)28i
Acceleration checkpoints
0-60 mph
0-97 km/h
5.6 s
5.2 s
0-100 km/h
0-62 mph
5.9 s
5.5 s
0-200 km/h
0-124 mph
22.3 s
19.6 s
Top speed
263 km/h
163 mph
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
5.9 s
1/8 mile
201 m
9.1 s
8.9 s
1000 ft
305 m
11.8 s
11.5 s
1/4 mile
402 m
14.0 s
13.6 s
Trap speed
1/4 mile
402 m
164 km/h
102 mph
171 km/h
106 mph

Power comparison

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

Chart data table
VehicleValue
PorscheBoxster (987)Facelift 20092.9
255 hp
190 kW
BMWZ4 (E89)28i
245 hp
183 kW

Porsche Boxster (987) Facelift 2009 2.9 has 10 hp more than BMW Z4 (E89) 28i.

The biggest power difference is between BMW Z4 (E89) 28i and Porsche Boxster (987) Facelift 2009 2.9: 10 hp (7 kW).

Torque comparison

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

Chart data table
VehicleValue
PorscheBoxster (987)Facelift 20092.9
290 Nm
214 lb-ft
BMWZ4 (E89)28i
350 Nm
258 lb-ft

Curb weight comparison

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

Chart data table
VehicleValue
PorscheBoxster (987)Facelift 20092.9
1,335 kg
2,943 lb
BMWZ4 (E89)28i
1,495 kg
3,296 lb

Top speed without limiter comparison

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

Chart data table
VehicleValue
PorscheBoxster (987)Facelift 20092.9
263 km/h
163 mph
BMWZ4 (E89)28i
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
PorscheBoxster (987)Facelift 20092.95.9 s
BMWZ4 (E89)28i5.5 s

Although Porsche Boxster (987) Facelift 2009 2.9 has more power, BMW Z4 (E89) 28i is quicker from 0-100 km/h.

The biggest 0-100 km/h difference is between BMW Z4 (E89) 28i and Porsche Boxster (987) Facelift 2009 2.9: 0.4 s.

Fuel consumption comparison

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

Chart data table
VehicleValue
PorscheBoxster (987)Facelift 20092.9
9.4 L/100 km
25.0 mpg US
30.1 mpg UK
BMWZ4 (E89)28i
6.8 L/100 km
34.6 mpg US
41.5 mpg UK

The biggest fuel consumption difference is between BMW Z4 (E89) 28i and Porsche Boxster (987) Facelift 2009 2.9: 2.6 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
PorscheBoxster (987)Facelift 20092.9
191 hp/t
142 kW/t
5.2 kg/hp
BMWZ4 (E89)28i
164 hp/t
122 kW/t
6.1 kg/hp

Estimated range comparison

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

Chart data table
VehicleValue
PorscheBoxster (987)Facelift 20092.9
691 km
430 mi
BMWZ4 (E89)28i
809 km
503 mi

Performance spider chart

Radar chart comparing normalized performance and fuel-consumption scores.

Chart data table
VehiclePowerAccelerationTop speed
PorscheBoxster (987)Facelift 20092.9
255 hp
190 kW
5.9 s
263 km/h
163 mph
BMWZ4 (E89)28i
245 hp
183 kW
5.5 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
PorscheBoxster (987)Facelift 20092.9
Power
255 hp
190 kW
0-100 km/h5.9 s
Top speed
263 km/h
163 mph
Doors/seats
2 doors
2 seats
Trunk
130 L
4.6 cu ft
Length
4,342 mm
170.9 in
Height
1,292 mm
50.9 in
BMWZ4 (E89)28i
Power
245 hp
183 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-
Length
4,239 mm
166.9 in
Height
1,291 mm
50.8 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
PorscheBoxster (987)Facelift 20092.9
Power
255 hp
190 kW
0-100 km/h5.9 s
Top speed
263 km/h
163 mph
9.4 L/100 km
25.0 mpg US
30.1 mpg UK
BMWZ4 (E89)28i
Power
245 hp
183 kW
0-100 km/h5.5 s
Top speed
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
6.8 L/100 km
34.6 mpg US
41.5 mpg UK

BMW Z4 (E89) 28i 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
PorscheBoxster (987)Facelift 20092.9
9.4 L/100 km
25.0 mpg US
30.1 mpg UK
5.9 s
BMWZ4 (E89)28i
6.8 L/100 km
34.6 mpg US
41.5 mpg UK
5.5 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
PorscheBoxster (987)Facelift 20092.9
191 hp/t
142 kW/t
5.2 kg/hp
9.4 L/100 km
25.0 mpg US
30.1 mpg UK
BMWZ4 (E89)28i
164 hp/t
122 kW/t
6.1 kg/hp
6.8 L/100 km
34.6 mpg US
41.5 mpg UK

Detailed score breakdown

Detailed score breakdown
VehiclePorscheBoxster (987)Facelift 20092.9BMWZ4 (E89)28i
Power
255 hp
190 kW
245 hp
183 kW
Torque
290 Nm
214 lb-ft
350 Nm
258 lb-ft
Acceleration
5.9 s
5.5 s
Top speed
263 km/h
163 mph
Unrestricted
260 km/h162 mph
Restricted
250 km/h155 mph
Lightness
1,335 kg
2,943 lb
1,495 kg
3,296 lb
Fuel consumption
9.4 L/100 km
25.0 mpg US
30.1 mpg UK
6.8 L/100 km
34.6 mpg US
41.5 mpg UK
Practicality
Doors/seats
2 doors
2 seats
Trunk
130 L
4.6 cu ft
Length
4,342 mm
170.9 in
Height
1,292 mm
50.9 in
Doors/seats
2 doors
2 seats
Trunk-
Length
4,239 mm
166.9 in
Height
1,291 mm
50.8 in
Range score
691 km
430 mi
809 km
503 mi
CO2 score
221 g/km
159 g/km
Trunk score
130 L
4.6 cu ft
-
Power-to-weight score
191 hp/t
142 kW/t
5.2 kg/hp
164 hp/t
122 kW/t
6.1 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 Boxster (987) Facelift 2009 2.9BMW Z4 (E89) 28i
Consumption9.4 L/100 km25 mpg US30.1 mpg UK6.8 L/100 km34.6 mpg US41.5 mpg UK
Cost / 100 km16.45 LC100 km11.90 LC100 km
Cost / 100 mi26.47 LC100 mi19.15 LC100 mi
Annual fuel used1,410 L372 US gal310 UK gal1,020 L269 US gal224 UK gal
Annual fuel cost2,468 LC/year1,785 LC/year

Head-to-head comparisons

Porsche Boxster (987) Facelift 2009 2.9

  • Has 10 hp more
  • Is 160 kg lighter
  • Has 3 km/h (2 mph) higher top speed
  • Has 27 hp/t better power-to-weight

Pros

  • Highest top speed
  • Most powerful
  • Lightest
  • Best power-to-weight ratio

Cons

  • Slowest 0-100 km/h
  • Highest combined fuel consumption
  • Highest CO2 emissions

BMW Z4 (E89) 28i

  • Has 60 Nm more
  • Is 0.4 s quicker from 0-100 km/h
  • Uses 2.6 L/100 km less fuel
  • Has 117 km (73 mi) more estimated range
  • Emits 62 g/km less CO2

Pros

  • Quickest 0-100 km/h in this comparison
  • Highest torque
  • Lowest combined fuel consumption
  • Best estimated range

Cons

  • Lowest power
  • Heaviest
  • Lowest top speed

Choose cars to compare

Brand
Model
Generation
Engine or modification
Porsche Boxster (987) 2.9
BMW Z4 (E89) 28i
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2 vehicles selected

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