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Car #1
Make
Model
Variant
Engine
Car #2
Make
Model
Variant
Engine

compare selected cars
2005. - 2011.
S - Sports car
coupe, 2 door
rear
Badges
Production
Vehicle class
Body style
Wheel drive
Safety
2006. - 2009.
S - Sports car
coupe, 2 door
rear

Marketing

Dimensons & Outlines

4427 mm
1808 mm
1310 mm
135 liters
135 liters
64 liters
Length
Width
Height
Boot (min)
Boot (max)
Fuel tank
4091 mm
1781 mm
1268 mm
260 liters
260 liters
55 liters
2005 Porsche 911
2006 BMW Z4 Coupe

Engine

Petrol
6 - Boxer, 4 valves per cylinder
Nat. Asp.
3600 cc
415 hp
405 Nm
Engine
Fuel
Configuration
Aspiration
Displacement
Power
Torque
Petrol
6 - Inline, 4 valves per cylinder
Nat. Asp.
3246 cc
343 hp
365 Nm

Performance (manual gearbox)

manual gearbox - 6 gears
1470 kg
4.3 s
310 km/h
19.8 l/100km
8.9 l/100km
12.1 l/100km
g/km
Gearbox type
Vehicle weight
Acc. 0-100
Top speed
Cons. (urban)
Cons. (highway)
Cons. (average)
CO2 emissions
manual gearbox - 6 gears
1395 kg
5.0 s
250 km/h
18.2 l/100km
8.6 l/100km
12.1 l/100km
292 g/km

Performance (automatic gearbox)

 
kg
s
km/h
l/100km
l/100km
l/100km
g/km
Gearbox type
Vehicle weight
Acc. 0-100
Top speed
Cons. (urban)
Cons. (highway)
Cons. (average)
CO2 emissions
 
kg
s
km/h
l/100km
l/100km
l/100km
g/km

Expenses

1 EUR
Price from
8800 EUR

Virtual Adviser's™ opinion

Overview

Well, these are two pretty similar cars we have here! It's only details that could potentially make the difference. Considering they both belong to the sports car segment and utilize the same 2-door coupe body style and the rear wheel drive system, it all comes up to the specific petrol engine choice they offer. The first one has a Porsche-engineered powertrain under the hood, a 6-cylinder, 24-valves 415hp unit, while the other one gets its power and torque from a 6-cylinder, 24-valves 343hp engine designed by BMW.

Safety

The fact that the BMW got tested by the European New Car Assessment Programme (Euro NCAP), while the other contender didn't, offers a slight advantage, as the 4-star rating is better than none. Still, apart from the official crash test results there are other things we need to be aware of. Both vehicles belong to the sports car segment, which is generally classifying them somewhere in the middle safety-wise, but it doesn't do much to help us decide between the two. Furthermore, taking kerb weight as an important factor into account, 911 offers a marginal difference of 5% more metal.

Reliability

Manufacturers have been building their reliability reputation for decades now and, generally speaking, it appears that BMW does have a slight advantage, all the models observed together. These are the official statistics, while our visitors describe reliability of Porsche with an average rating of 3.8, and models under the BMW badge with 4.2 out of 5. Unfortunatelly, I don't have enough insight that would allow me to comment in more details on the specific models level. Above it all, drivers of cars with the same engine as 911 rank it on average as 3.0 out of 5, exactly the same as the other one.

Performance & Fuel economy

Porsche is a bit more agile, reaching 100km/h in 0.7 seconds less than its competitor. In addition to that it accelerates all the way to 310 kilometers per hour, 60km/h more than the other car. When it comes to fuel economy things look pretty much the same for both cars, averaging around 12.1 liters of fuel per 100 kilometers (23 mpg), in combined cycle.


Verdict

BMW appears just a bit more reliable, although the difference is truly marginal. The most important thing when deciding between any two vehicles should always be safety, both passive and active. In my opinion, everything taken into account, BMW Z4 offers much better overall protection, which launches it ahead of the other contender. From there things take a different direction, with Porsche offering somewhat better performance, just enough to call it quicker. Fuel consumption is more or less the same. No mistake, whatever you decide here, but I'd still go for the BMW. In any case that's my personal view, built upon all the data available to me. What should decide here though is the way you feel about the two vehicles, and I hope you'll find my guidelines useful in the process. I suggest you spend two more minutes in order to find out which car, based on your needs and budget, would be picked by the virtual adviser, among more than 12.000 different ones in our database.

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