Porsche 911 vs BMW Z4

What's the difference?

In describing this 911, Porsche talks about the 'T-feeling'. It should be light and agile, delivering fun, driving pleasure, yet still suitable for everyday use.

Sure, the safety could be better and the warranty lags the market, but that stuff fades into the background when the T feeling takes over. What a great car!

The Z4 didn’t make me feel like Peirce Brosnan’s 007. It’s way too serious – a proper gritty reboot. Maybe it’s meant for Daniel Craig. Either way, its brave design makes it one of the best-looking BMWs of recent memory, and it’s a tech- and comfort-fest that the Bavarian automaker should be proud of. I just wish it was a smidge more fun behind the wheel.

One of the most recognisable profiles in the automotive world, the 911 has evolved and grown over time but there's no mistaking it for anything other than Zuffenhausen's finest.

For the record, the current '992' 911 is a whopping 367mm longer, 242mm wider and 30mm lower than the 1963 original. And the majority of models share the same (1852mm) wide-body look, the Turbo and GT3 RS broadening that to 1900mm.

Multiple solid and metallic colours are available at no extra cost, three of which are exclusive to the Carrera T, but if you like our test car's 'striking' 'Python Green' finish, it'll set you back an extra $5700.

Car-spotters on the lookout for the Carrera T will need to tick off 'Agate Grey' accents on the tail-light grille, badging and mirror housings as well as a grey top tint windscreen, specific side graphics and Carrera S wheels in 'Titanium Grey'.

The cabin in our test car also has also been optionally upgraded with the 'Carrera T Interior Package' ($4120), which adds extra leather trim as well as coloured seat belts and contrast stitching.

Our car has also picked up the 'Adaptive Sports Seats' ($5510). Subjective call, of course, but I love the dark cloth seat inserts with tiny flecks of green. It's Porsche retro-cool, but somehow contemporary at the same time. Beautiful.

And the five-dial instrument cluster under a gently curved cowl is a 911 design signature, although the central tachometer is now flanked by twin 7.0-inch, configurable displays.

Ergonomically and aesthetically, this layout is hard to fault.

The Z4 is a sight to behold. It’s brave, especially for a BMW, it even betrays the brand’s strongest styling pillars, making its own way with its more horizontal grille design, flat body and curved out rear.

It’s more than that, though. In black, this car looks sinister, brooding. The more you look at it, the more you notice tiny details - the scooped-out sides, or the way the entire rear seems to flick up into the integrated spoiler. I couldn’t get enough of staring at it – it manages to look even better with the roof down.

That’s probably when it hit me. To my eyes, at least, this is the most stunning BMW in years. Sure, the X7 is a sight to behold due to its sheer dimensions and borderline offensive grille, but the Z4 is the opposite. It’s subtle, it hides its details away in its silhouette.

It’s designer, Calvin Luk (an Australian no less), was inspired at least in part by the Z8 – another Brosnan bond car – and you can see the Fisker design reflected in the Z4’s low, flat grille and almost bulbous rear.

Inside, sadly, the Z4’s strong design doesn’t quite play out. There’s no wily Fisker touches here, just a standard set of BMW switchgear. While it all works well, it just dumbs down the Z4’s character.

The big, chunky steering wheel in particular is a let-down. It’s the same wheel that sits in the brand’s X5 SUV, and it feels right there, but not here in a convertible where you’re so close to the ground. A smaller wheel would not only suit this car better, it would make it feel just a smidge more alive. I miss the three-spoke M sport wheel from previous-generation BMW cars.

I do like the dash, which is seemly carved from rhomboid shapes - a theme that rolls into the doors, screens, and vents elegantly. I’m normally not a fan of gloss plastics and chrome touches, but in the Z4 they’re all tastefully applied.

The seats, too, are lovely. I’m not sure about the contrast bright-red leather our car came with, but they’re nice and close to the ground and have excellent trim that you seem to sink into just enough to be comfortable and sporty all at once.

It’s a slick place to be, I just wish it felt less like you were at the helm of an SUV and more like you were driving something that looks this damn good.

Even though the current 911 dwarfs the original '901' series of sixty years ago, it's still aimed primarily at accommodating the driver and front passenger, with '+2' rear seating a handy addition for kids, or adults in short trip emergencies.

In other markets, the addition of the rear seats is a no-cost option, whereas here they're the default fitment and removing them is the zero-dollar choice. Which makes sense because they add significantly to the car's usability.

Either way, a sports car of this type is never going to be SUV practical. However, when you look at it in the context of the Carrera T's competitors, this 911 does pretty well.

It feels appropriately snug inside, yet there's more than enough breathing space in the front and a liveable distance between driver and passenger.

For storage there are two slim compartments in each door, with a cavity for bottles, as well as a cupholder in the centre console and another pop-out holder in the dash on the passenger side.

As in most 911s, you can swap the centre console cupholder out with a small oddments tray insert which is a nifty piece of practical thinking.

There's also a modest glove box, a shallow lidded compartment between the seats and clothes hooks on the front seat backrests.

Connectivity and power options run to a pair of USB-C ports in the centre console box and a 12-volt outlet in the passenger footwell. Nothing in the back, which isn't a big surprise.

And the 132-litre boot is the only substantial cargo space, with enough room for several soft bags or a medium suitcase… even a mid-week grocery top-up.

Luggage-type storage inside the car is helped by the rear seat backs folding down to create a level platform.

But bear in mind there's no spare. A can of sealant and air compressor are on board instead.

The Z4 is a convertible, so it’s naturally compromised on space. As far as convertibles go though, you’ll be hard pressed to find one you can fit more stuff into.

The Z4 is wide - the same width, in fact, as a 5 Series - and this carries into the cabin. There are only two seats, but those seats are wide, and occupants will find themselves with luxurious amounts of airspace for their arms, as well as excellent leather-trimmed and padded surfaces for landing elbows on.

Legroom is also great, as the seats have a surprising amount of rail-travel on them, so that even taller folk won’t struggle to fit their limbs in.

A genuinely impressive characteristic of the Z4 is much head room there it is. Despite its low-slung looks from the outside, the roof towers over my 182cm tall head when I’m inside, so this isn’t one of those convertibles that feels like braking too hard might simply decapitate those above six-foot tall.

In terms of storage areas you get some long but shallow trenches in the doors, a bay with connection ports and a Qi wireless charging pad under the air-conditioning controls, a glovebox (hey, not all convertibles have them) and a trick centre console that houses two deep cupholders inside.

There’s also a netted shelf behind the seats that could fit small bags, and given the length of the cabin, you could even fit laptops and the like behind the seats provided you haven’t used the full extent of the seat’s rearward movement.

The boot is deep, wide and long for a drop-top, and offers a total of 281-litres which is more than some popular hatchbacks. It even offers tie-down points and netting either side. To top it off, the fabric roof folds away into its own compartment, so the boot space is unaffected if you choose to drop the lid.

For a convertible – the Z4 is a practicality wizard.

The Z4 isn’t cheap, but it plays in a field of expensive Deutsche drop-tops. Our car was the mid-spec 30i which comes in at an MSRP of $104,900 (before on-road costs).

For that you’ll get a more highly tuned version of the base 20i’s four-cylinder turbocharged engine, producing 190kW/400Nm, 19-inch alloy wheels, M Sport brakes, Adaptive M suspension, and adaptive LED headlights.

That’s on top of the already impressively-specified 20i’s kit which includes dual 10.25-inch screens – one for the multimedia functions, the other as a digital dashboard, a head-up display, full Vernasca leather interior trim, auto-dimming rearview mirror, power adjustable and heated front seats with memory function, dual-zone climate control, 10-speaker 205W stereo, a Qi wireless charging pad, and adaptive cruise control as part of a marginally upgraded safety package (more on that in the safety section).

It’s a pretty plush set of equipment, although a challenging value proposition as the almost-as-well-equipped 20i starts from $84,900, a full $20k cheaper.

Rivals for this 30i model? You’ve got the soon-to-be-discontinued Mercedes-Benz SLC300 ($102,500), all-wheel drive Audi TT S quattro ($105,661), and, at a stretch, the entry-level Porsche Boxster ($122,960).

Of course, being a premium European car, there is an extensive options list. Our car was fitted with the excellent and probably-worth-the-money M Sport differential ($2400), as well as the rudely priced M seat belts (literally just the M pattern embroidered in - $560!) and interior ambient lighting package (lovely, perhaps not worth $550).

The Z4 is only offered in five colours, three of which – including our car’s Black Sapphire – come at a cost of $2000. The red interior, surprisingly, is a no-cost option.

If you’re keeping track that brings the car you’re looking at here to $110,410. Not cheap, and it doesn’t have six-cylinders - but given its other attributes explored later in this review, the fact that it still manages to undercut an entry-level Boxster is actually reasonable.

One of the saddest things about recent 911s is the fact that when you open the cover you can't see the engine unless you decide to break out the spanners and remove everything that's hiding it.

If you did, you'd reveal a 3.0-litre, all-alloy, dry-sumped, twin-turbo flat six-cylinder engine which remains unchanged from the entry Carrera model.

Featuring direct-injection and variable valve control, it sends more than 280kW (380hp) and 450Nm (from 1950-5000rpm) to the rear wheels through a seven-speed manual gearbox, or in this case, the no-cost optional eight-speed dual-clutch auto.

Suffice it to say, in a car weighing less than 1.5 tonnes, that's plenty of propulsion, and even though an engine hanging over the rear axle remains a peculiar 911 throwback, the white-coated boffins in Stuttgart continue to make it work brilliantly well.

Welcome to the age of ridiculously powered four-cylinder turbo engines. Despite a capacity of just 2.0-litres, the engine in the Z4 30i produces a whopping 190kW/400Nm.

That’s probably enough for a car this size. I’m keen to drive the six-cylinder, but surprisingly it seems to offer diminishing returns for extra cylinders offering a 60kW/100Nm power boost for an extra $20,000. Perhaps a six-cylinder is the way to go in a BMW, and given this car’s other seriously sporty attributes, it might be the only way to make it a bit more… fun. More on that in the driving section.

All Z4s are rear-wheel drive, using an eight-speed torque converter automatic. Sorry, no option for a manual this time around.

Porsche's official fuel economy number for the combined (ADR 81/02 - urban, extra-urban) cycle is 10.8L/100km for the dual-clutch auto as tested, the 3.0-litre twin-turbo six emitting 246g/km of CO2 in the process.

During a week of city, suburban and some at times enthusiastic highway running, we averaged 15.0L/100km (at the pump), while the car's onboard computer indicated 16.1L/100km, which isn't out of line with the super- and turbo-charged V8s this car competes with.

Minimum fuel requirement is 98 RON 'premium' unleaded and you'll need 64 litres of it to fill the tank.

Using the official number, that translates to a driving range of around 590km, which drops to roughly 430km using our real-world figure.

It’s claimed that the Z4 will drink just 6.5 litres per 100 kilometres on the official combined cycle test, but I found that sticking my foot in occasionally resulted in a slightly more realistic sounding figure of 8.4L/100km.

That’s still a great fuel consumption number for a car like this, and perhaps one of the strongest benefits of having just four cylinders.

A discerning vehicle, the Z4 will drink nothing less than the best-quality 98RON unleaded to fill its 52-litre tank.

At 1470kg the 911 Carrera T is 35kg lighter than the entry-level car it's based on, thanks largely to reduced sound insulation, lightweight glazing and a more compact battery.

Yes, the rear seats are fitted to our test example, which sends the scales back up a bit, but the reduced sound deadening still raises the standard sports exhaust's glorious rumble through the cabin.

Porsche claims 0-100km/h in 4.0 seconds for the auto and 4.5s for the seven-speed manual. Yep, it's quick!

Peak torque (450Nm) is on hand from 1950-5000rpm, which means there's always substantial mid-range punch available, with the dual-clutch auto's eight ratios also helping to keep things on the boil.

I love a manual gearbox as much as the next person, but this dual-clutch is ultra fast yet refined with the wheel-mounted paddles adding to the fun.

The 'Driving Mode' dial on the steering wheel enables selection of 'Normal', 'Sport', 'Sport Plus' and 'Individual' modes, with each selection displayed in the instrument cluster.

And given the 'Sport Chrono Package' is standard the 'Sport Response' button in the centre of that mode dial acts like a push-to-pass function, delivering a 20-second burst of maximum performance response from the engine and transmission.

Suspension is by struts at the front and multi-links at the rear, with ride height dropped by 10mm and the standard 'Porsche Active Suspension Management' (PASM) system able to adjust the dampers through 'Normal' and 'Sport' modes.

Ride comfort is harsh, even in the most comfort-focused setting, but that kind of goes with the Carrera T territory.

The steering is pretty much perfection. Precise and accurate, with amazing road feel, it allows the old 'think your way through corners' syndrome.

Speaking of which, this car chews up and spits out twisting B-roads without a hint of drama. The front end sticks and refuses to let go, the big 305 rear rubber following suit.

It remains resolutely planted, balanced and adjustable on the throttle, the standard torque vectoring set-up and locking diff turning go-fast wannabes into bonafide apex predators.
  
Standard rubber is Z-rated Goodyear Eagle F1 (245/35x20 fr - 305/30x21 rr) which is 10mm wider than the already generously shod 911 Carrera.

Braking is suitably beefy with 330mm ventilated and cross-drilled rotors all around clamped by four-piston aluminium monobloc fixed calipers front and rear.

We got the bit between our teeth at various stages of this test and can confirm the brakes are able to wash off speed rapidly and consistently with a reassuringly firm yet progressive pedal.

Under the heading of miscellaneous observations, the optional 18-way adjustable Adaptive Sports Seats fitted to the test car are brilliant. Comfortable for cruising, they can be dialled up to King Kong levels of grip when required.

A super useful feature is the ability to adjust the passenger seat with the driver's seat controls. So convenient for setting things back to normal after the co-pilot has cranked forward to accommodate a rear seat passenger.

The GT sport steering wheel is just right in terms of its diameter and grippiness and the overhead 'Surround View' function helps when manoeuvring a low and wide-hipped car like this one.

A car that looks this good better live up to the promise behind the wheel, right?

For the most part, the 30i does, but it’s a victim of its own performance credentials and luxuriousness.

See, a drop-top should be fun-packed, you should feel close to the road, connected. Sadly, a combination Z4’s excellent suspension and not-so-excellent SUV-like interior separates you too much from the surface below.

An advantage, of course, is the refinement on offer. The Z4 is easily one of the quietest, most refined convertibles I’ve ever driven, but it’s a little too insulated.

I can’t help but feel like it’s all business and no pleasure. It feels a little more like I should be cruising to work on the autobahn and a little less like I should be flinging it around corners on a tight B-road.

It feels almost wrong to drive it in a T-shirt. It’s serious and doesn’t want you to mess around, it wants you to wear a suit and tie.

This grand-tourer style feel is one that will keep a lot of buyers in the premium space happy, but I’m of the opinion that BMW will have that segment well and truly covered by the new 8 Series. If the budget allows.

Regardless, the 30i’s four-cyl engine feels like any six-cylinder would have a few years ago. It’s got a surge to it in the straights that’s quite satisfying, and it responds via the exhaust with an angry tone that makes it feel a little more alive, especially with the roof down.

This feeling was all helped along by our car’s M active differential which simply won’t let the fat tyres at the rear slide unless you’ve got high-speeds and loads of tarmac to play with – for better or worse.

The Z4 also has ‘variable sport steering’ which reacts to the car’s speed and position of the wheels to adjust the input ratio. It’s good when you’re at speed, but the weight and response of the steering can make the Z4 feel bigger than it actually is at lower speeds. 

The suspension is firm, and can be a little bouncy over rough surfaces, but seems well suited to the Z4’s chassis.

Other than those notable characteristics you’ll find that the Z4 is wonderfully tuned in terms of its inputs, everything is slick and smooth, suited perfectly for long meandering drives.

Convertibles and safety don’t often fall in the same sentence, unless its one where a concerned relative is trying to convince you not to buy one.

In any case, the Z4 benefits from four airbags (dual front and dual side), as well as the expected electronic stability controls. That optional M Sport differential will have the added bonus of preventing any unexpected slip and slide at the rear.

On the active side the Z4 gets ‘Driving Assistant’ which includes forward collision warning (FCW), lane departure warning (LDW), rear cross traffic alert (RCTA), and rear collision warning. The 30i grade also gets 'active cruise control with stop & go' which allows for full auto emergency braking (AEB) with pedestrian and cyclist detection. Not on the spec sheet, but apparently present in the car I drove was some form of traffic sign recognition (TSR) and lane keep assist (LKAS).

A nice high-res reversing camera displayed on the massive touchscreen is a welcome standard addition.

Considering the meagre safety specification of most convertible cars, the Z4 30i shines with a half-way decent active safety suite. But you can forget ISOFIX child-seat anchor points. There aren't any. 

Porsche's three-year, unlimited-kilometre warranty is off the pace now, although the paint is covered for the same period, and a 12-year (unlimited km) anti-corrosion warranty is also included.

'Porsche Roadside Assist' provides 24/7 coverage for the life of the warranty, and after the warranty runs out is renewed for 12 months every time the vehicle is serviced at an authorised Porsche dealer.

The main service interval is 12 months/15,000km but no capped-price servicing is available, with final costs determined at the dealer level (in line with variable labour rates by state or territory).

If recent quotes are anything to go by BMW is set to stick by its lacklustre three-year unlimited kilometre warranty, as it says its customers simply aren’t interested in five years (or longer) when it comes to warranty coverage.

It’s a shame, as even Volkswagen has upped its warranty to five years, and Mercedes has considered a 10-year coverage plan in the past.

In terms of servicing, there are two fixed-price plans available – the suspiciously cheap ‘Basic’ plan which comes at a cost of $1373 for five years (or $274.60 per year) and the more realistic-sounding ‘Plus’ which costs $3934 over five years (or $786.80 per year).

Like every other BMW, the Z4’s computer tells you when its service time: how often it needs maintenance will depend on how often – and how hard – you drive it.