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BMW 8 Series Convertible vs Porsche 911 Convertible comparison

Compare performance (625 HP vs 711 HP), boot space and price (99,400 £ vs 138,000 £ ) at a glance. Find out which car is the better choice for you – BMW 8 Series Convertible or Porsche 911 Convertible?

BMW 8 Series Convertible vs Porsche 911 Convertible: Key differences

BMW 8 Series Convertible

  • clearly cheaper
  • clearly more efficient
details

Porsche 911 Convertible

  • a bit more power
  • clearly quicker 0–100 km/h
  • markedly lighter
  • barely more trunk space
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By Achim Sedelmaier

Here’s where it gets real: The technical differences in detail

8 Series Convertible

Costs and Efficiency:

Price and efficiency are key factors when choosing a car – and this is often where the real differences emerge.

BMW 8 Series Convertible is clearly cheaper – starting at 99,400 £ , while the Porsche 911 Convertible costs 138,000 £ . That’s a price difference of around 38,572 £.

Fuel consumption also shows a difference: the BMW 8 Series Convertible uses 6.9 L/100km and is clearly more efficient than the Porsche 911 Convertible with 10.5 L/100km. The difference is about 3.6 L/100km.

911 Convertible

Engine and Performance:

Power, torque and acceleration are the classic benchmarks for car enthusiasts – and here, some clear differences start to show.

When it comes to engine power, the Porsche 911 Convertible offers a bit more power – delivering 711 HP compared to 625 HP. That’s roughly 86 HP more horsepower.

When accelerating from 0 to 100 km/h, the Porsche 911 Convertible is clearly quicker – completing the sprint in 2.6 s, while the BMW 8 Series Convertible takes 3.3 s. That’s about 0.7 s quicker.

There’s also a difference in torque: the Porsche 911 Convertible delivers marginally more torque with 800 Nm compared to 750 Nm. That’s about 50 Nm more.

8 Series Convertible

Space and Everyday Use:

Beyond pure performance, interior space and usability matter most in daily life. This is where you see which car is more practical and versatile.

Both vehicles offer seating for 4 people.

In terms of curb weight, Porsche 911 Convertible is markedly lighter – 1,572 kg compared to 1,915 kg. The difference is around 343 kg.

Looking at boot space, the Porsche 911 Convertible offers barely more boot space – 373 L compared to 350 L. That’s a difference of about 23 L.

When it comes to payload, the BMW 8 Series Convertible carries moderately more – 425 kg compared to 345 kg. That’s a difference of about 80 kg.

Who wins the race in the data check?

The BMW 8 Series Convertible is clearly superior overall in the objective data comparison.
This result only shows which model scores more points on paper – not which of the two cars feels right for you.

from £99,400
8 Series Convertible

BMW 8 Series Convertible

  • Engine Type Diesel MHEV, Petrol
  • Transmission Automatic
  • Drive Type All-Wheel Drive, Rear-Wheel Drive
  • Power HP 333 - 625 HP
  • Consumption L/100km 6.9 - 11.2 L/100km
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Costs and Consumption
View detailed analysis

Engine and Performance
View detailed analysis

Dimensions and Body
View detailed analysis

BMW 8 Series Convertible

The BMW 8 Series Convertible is a head-turning grand tourer that drops its roof with the kind of theatrical flourish you expect from a modern Bavarian showboat. It wraps occupants in sumptuous materials and driver-focused polish, offering effortless long-distance comfort and just enough drama to make every arrival feel like an occasion.

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Reviews BMW 8 Series Convertible

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Porsche 911 Convertible

The Porsche 911 Cabriolet transforms the iconic silhouette into an open‑air weapon, offering roof-down glamour and razor-sharp handling that still feels perfectly composed on normal roads. It’s the kind of car that serves daily duties with surprising ease while delivering intoxicating engine music and a grin factor that makes every trip feel like a small victory.

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Reviews Porsche 911 Convertible

No reviews yet. Share your experience and help others decide.

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BMW 8 Series Convertible
Porsche 911 Convertible

Costs and Consumption
Price
99,400 - 165,800 £
Price
138,000 - 244,500 £
Consumption L/100km
6.9 - 11.2 L/100km
Consumption L/100km
10.5 - 13.7 L/100km
Consumption kWh/100km
-
Consumption kWh/100km
-
Electric Range
-
Electric Range
-
Battery Capacity
-
Battery Capacity
-
co2
180 - 255 g/km
co2
237 - 310 g/km
Fuel tank capacity
66 - 68 L
Fuel tank capacity
-

Dimensions and Body
Body Type
Convertible
Body Type
Convertible
Seats
4
Seats
2 - 4
Doors
2
Doors
-
Curb weight
1,915 - 2,125 kg
Curb weight
1,572 - 1,900 kg
Trunk capacity
350 L
Trunk capacity
163 - 373 L
Length
4,851 - 4,867 mm
Length
-
Width
1,902 - 1,907 mm
Width
1,852 - 1,900 mm
Height
1,345 - 1,353 mm
Height
-
Max trunk capacity
-
Max trunk capacity
-
Payload
340 - 425 kg
Payload
195 - 345 kg

Engine and Performance
Engine Type
Diesel MHEV, Petrol
Engine Type
Petrol, Full Hybrid
Transmission
Automatic
Transmission
Manuel, Automatic
Transmission Detail
Automatic Gearbox
Transmission Detail
Manual Gearbox, Dual-Clutch Automatic
Drive Type
All-Wheel Drive, Rear-Wheel Drive
Drive Type
Rear-Wheel Drive, All-Wheel Drive
Power HP
333 - 625 HP
Power HP
394 - 711 HP
Acceleration 0-100km/h
3.3 - 5.5 s
Acceleration 0-100km/h
2.6 - 4.7 s
Max Speed
250 km/h
Max Speed
-
Torque
500 - 750 Nm
Torque
450 - 800 Nm
Number of Cylinders
6 - 8
Number of Cylinders
6
Power kW
245 - 460 kW
Power kW
290 - 523 kW
Engine capacity
2,993 - 4,395 cm3
Engine capacity
2,981 - 3,996 cm3

General
Model Year
2024
Model Year
2,024 - 2,026
CO2 Efficiency Class
G
CO2 Efficiency Class
G
Brand
BMW
Brand
Porsche
What drivetrain options does the BMW 8 Series Convertible have?

Available configurations include All-Wheel Drive or Rear-Wheel Drive.

DriveDuel uses data analysis and artificial intelligence to evaluate vehicle data and create content. Content is regularly reviewed and improved. The displayed prices are estimates based on German list prices, adjusted to the respective country’s VAT. Country-specific registration taxes are not included. This information is not legally binding.