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2017 BMW M140i Performance Edition long-term review

By Scott Newman, 05 Nov 2017 Reviews

2017 BMW M140i headlights

Dream-spec M140i enters the garage

Introduction: Hatching a plan

We’re nothing if not greedy here at MOTOR. Our latest long-termer is one of 60 BMW M140i Performance Editions produced for Australia only.

In fact, it’s even rarer than that, as 1ID-7CK is one of just 15 manual M140i PEs so if you’re waiting to buy one, sorry, we’re not quite done with it yet.

In our defence, having rambled on at length about the M140i/M240i’s need for a limited-slip diff (and their M135i/M235i predecessors), when BMW answers our pleas is it any wonder we have our hands up for an extended test?

2017 BMW M140i sideThat’s right, in addition to the plethora of M Performance parts liberally scattered about the M140i PE’s interior and exterior, the 15 manuals receive a mechanical LSD as standard.

The 45 automatic PEs miss out on this upgrade but still benefit from 19-inch alloys, a performance exhaust, carbon fibre mirror covers and a black grille, rear fins and spoiler to differentiate it from its standard sibling.

Inside it adds an Alcantara steering wheel, cloth/Alcantara sports seats (leather optional), splashes of carbon fibre trim, LED door sills and aluminium pedals for a sporty look.

2017 BMW M140i steering wheelIt continues BMW’s Australia-only initiatives which have included the bargain-priced, de-specced Pure series that’s encompassed everything from M2 to M5.

In the words of BMW Australia’s CEO Marc Werner: “[The M140i] is a car with a strong enthusiast following. This Performance Edition builds further on these strengths and its limited production status creates a halo effect for the 1 Series range.”

Each car is identified by a ‘1 of 60’ build plaque and costs $71,900 before on-roads, a premium of $7000 over a regular M140i. You could build your own Performance Edition from BMW’s extensive M Performance Parts range, however buying each part individually would leave you with a bill for around $20,000 – the wheels and tyres alone are $6594, the diff another $4730 (plus fitting).

2017 BMW M140i M Performance badgeBeing based on the new M140i means the Performance Edition packs the latest B58 3.0-litre turbocharged inline-six developing 250kW/500Nm. This cuts the 0-100km/h claim to a brisk 4.6sec in eight-speed auto guise, the manual adding an extra 0.2sec according to BMW – we’ll be putting that to the test in due course.

There are plenty of other questions that need answering. The Performance Edition comes standard with 19-inch wheels shod with Pirelli P Zero run-flat tyres, however each buyer also receives the standard 18s and Michelin Pilot Super Sports, so we’ll be doing plenty of kilometres on both sets of tyres to discover which is the better rubber.

2017 BMW M140i rearLikewise, is the limited-slip diff the final piece of the M140i’s dynamic puzzle that lifts it from excellent to exemplary? We already have a standard M140i booked in for a back-to-back evaluation.

Want to see more of our BMW M140i long-termer?

The same test should answer the question of six-speed manual vs eight-speed auto. Finally, in the face of German premium rivals that are lowering hot hatch acceleration times to supercar levels, is the M140i’s rear-drive USP a big enough carrot to entice keen drivers? We have four months (and two sets of tyres) to find out.

Update 1: Sibling Rivalry

Our BMW has a scrap with one of its siblings

The BMW M140i Performance Edition (PE) comes in two distinct flavours.

The vast majority (45 out of 60) are fitted with a ZF eight-speed automatic and bar a fruitier exhaust score only cosmetic upgrades. For the tiny percentage of customers who prefer to shift their own gears (only 6 per cent of M140i buyers choose manual), the other 15 examples use a six-speed manual, but also benefit from a proper mechanical limited-slip diff from the M Performance parts range.

So which is best? Does the manual add a crucial layer of involvement? Can you even notice the effects of the limited-slip diff? To answer these questions BMW kindly lent us its automatic PE for a back-to-back test. Let’s begin by examining the traits common to both cars.

2017-BMW-M140i-Performance-Edition-rear.jpgThe B58 3.0-litre turbo six is an absolute powerhouse; we’ll go into more detail about this new engine in a future update, but suffice to say it has one of the widest powerbands around and a level of performance that’s borderline excessive for the public road.

As the only rear-drive challenger in the hot hatch segment, the M140i offers a unique driving experience that its front- and all-wheel drive rivals can’t match. It’s not without flaws: the brakes are a bit wooden and the suspension lacks both a little compliance and travel resulting in a jittery ride over rippled surfaces and the car hopping over bumps at speed, particularly at the rear.

But these slight shortcomings fade into insignificance when compared to the positives. Despite relatively narrow tyres (225/35 front; 245/30 rear) there’s ample grip, more than is initially apparent, but not so much that it’s impossible to adjust the car’s attitude at relatively sane speeds.

2017 BMW M140i Performance Edition tyresIndeed, driving the M140i PE back-to-back with the latest M4 Competition is illuminating. The M4 is clearly the more serious performance machine, but with pace dictated by road regulations and common sense, the M140i is working harder to achieve that pace and thus offers a more engaging drive.

It’s also the easier car to drive quickly. The M4 offers more power, grip and traction, but the corollary to this is an edgier balance if limits are exceeded; the M140i slides earlier but its movements are more clearly telegraphed – it can be driven extremely hard with confidence.

Paradoxically, its Sports ESP setting is also more lenient, subtly trimming your excesses rather than stealing power away. There’s a strong case to be made that the M140i is the most enjoyable driver’s car BMW currently offers, which makes the fact the next-generation will switch to front-wheel drive all the more upsetting.

2017-BMW-M140i-vs-2017-BMW-M4.jpgThe limited-slip diff really should be standard fit, though. It doesn’t make the difference it once did as BMW’s faux-LSD technology, which brakes the spinning inside wheel to transfer torque to the loaded outside wheel, has improved, but the mechanical diff still markedly improves traction and predictability, particularly in slippery conditions.

Want to see more of our BMW M140i long-termer?

With the B58 engine now producing 500Nm from 1520rpm, accelerating hard in the standard car frequently starts a fight with the electronics as the grunt is shuffled from wheel to wheel. More often than not, the LSD-equipped PE just hooks up and goes or smoothly transitions into oversteer if traction is lost.

2017-BMW-M140i-steering.jpgIt also allows the car to be steered on the throttle, a sensation that never gets old. Given only the manual is equipped with an LSD the PE purchasing decision is a no-brainer, however, manual vs auto is a little more complex.

Like for like, without exception the MOTOR crew would choose an automatic M140i; simply put, the manual is okay, whereas the auto is exceptional and feels a better match for the engine.

It also allows you to concentrate on working the excellent chassis harder and, with eight closely stacked gears to choose from, makes the car even quicker. With M140i pricing being cut to $59,990, we’d buy the auto and spend the $4800 saved on that LSD. 

MONTH TWO

Fuel this month: 11.65L/100KM
Average: 11.65L/100KM
Distance this month: 1009KM
Total: 5839KM

Liked: Realising just how good this car is
Disliked: Ideal spec doesn’t exist
Favourite moment: Stalking the M4 on a twisty road

Update 2: The Name Game

Why the M140i lives up to its performance name

The switch from M135i to M140i was one of the more substantial mid-life facelifts of recent times, but you could be forgiven if it passed you by.

On paper the 3.0-litre turbo six swelled from 240kW/450Nm to 250kW/500Nm, which shaved 0.2sec from the claimed 0-100km/h time (now 4.6sec for the auto, 4.8sec for the manual) and allowed the badge to be changed to give the marketing team something to talk about.

In reality, the changes run much deeper for the M140i uses a completely new engine. The B58 replaces the N55, which has served duty since 2009 in everything from the M135i to the 740i to the X5.

2017-BMW-M140i-Performance-Edition-engne.jpgWhile both are nominally three litres in capacity, the B58 is slightly larger at 2998cc versus 2979cc and is part of BMW’s new modular engine family, which includes the B38 1.5-litre turbo triple and B48 2.0-litre four. Furthermore, the block is identical between B58 petrol and B57 diesel engines; this reduces production complexity and saves BMW money.

The all-aluminium crankcase is stronger thanks to its closed-deck design and the cylinder linings use an arc-sprayed coating to save weight and reduce friction. Emissions and fuel consumption are also further reduced thanks to a very short warm-up phase and heat encapsulation, which allows the engine to retain heat for up to 36 hours and therefore endure fewer cold starts.

2017-BMW-M140i-Performance-Edition-rear.jpgOn the performance side the twin-scroll turbocharger is bigger and integrated into the exhaust manifold to improve response (the exhaust gases only have to travel a very short distance) while the new water-to-air intercooler is integrated into the intake plenum.

According to various BMW blogs this is going to make life very difficult for tuners – you can’t just whack a bigger intercooler on, for instance – but as Dr Ian Malcolm said in Jurassic Park, “life finds a way”. On initial acquaintance the B58 feels a little too smooth and refined – like a sickly sweet dessert, too much of a good thing – but there is some aggro to be found.

It has an extraordinary powerband; maximum torque is delivered from just 1520rpm, yet meaningful power continues to be produced all the way to the 7000rpm redline. It proves the benefits of less boost/more capacity compared to rivals like the Audi RS3 and Mercedes-AMG A45 which offer even more power but not the same bandwidth.

2017-BMW-M140i-Performance-Edition-front.jpgIn a standard M140i the extra 50Nm torque produced by the B58 is almost overkill; the standard open diff can sometimes struggle to apportion so much grunt on anything but a perfect surface. That said, the broad spread of power makes it a breeze to performance test as even just walking it off the line results in meaningful acceleration.

At Bang For Your Bucks this year a standard automatic M140i more or less matched its claim by hitting 100km/h 4.65sec and continued on to a 12.76sec quarter mile at 180.53km/h. But our manual long-termer managed to beat this, clocking 4.58sec to 100km/h at Heathcote on the Pirelli P Zero runflats.

Once rolling the auto’s shorter gearing and instant shifts gave it the slight upper hand, the manual managing a 12.82sec quarter mile at 179.30km/h. It wasn’t even particularly difficult. With a cleanish strip and the LSD ensuring both wheels are turning equally it was merely a case of getting the car moving with around 2000rpm dialled up and then changing gear as quickly as possible.

2017-BMW-M140i-Performance-Edition-exterior.jpgToo many revs would result in excessive wheelspin so there’s the possibility of a faster time on a cleaner surface, though probably only a tenth or so. On the road this translates into massive performance available at virtually all times.

Want to see more of our BMW M140i long-termer?

It might sound like an odd comparison, but the M140i’s big engine/small car characteristics give it a distinct muscle-car vibe – the B58 definitely feels like the defining feature of the car.

About the only aspect that grates is the contrived, almost apologetic nature of the pops and bangs on the overrun, which feel at odds with the otherwise silky smooth nature of the boosted inline six. Nobody’s perfect. 

MONTH THREE

Fuel this month: 11.63l/100km
Average: 11.64l/100km
Distance this month: 1042km total 2151km

Like: Performance to burn
Dislike: Contrived pops and burbles
Favourite moment: Besting BMW’s 0-100km/h claim

Update 3: Conclusion 

Goodbye to what’s possibly the best drivers' hot hatch

Time’s up for 1ID-7CK – those three months went extremely quickly.

Trouble is, even if BMW was happy for us to keep it longer we couldn’t have, as we drove it so much it was fast approaching the 10,000km at which test cars are grounded.

It’s a mark of the high esteem in which we hold the M140i that it racked up kays so quickly, but before we wrap-up the good, the bad and the ugly of BMW’s uber-hatch we need to talk tyres.

2017-BMW-M140i-Performance-Edition-wheels.jpgThe Performance Edition comes fitted with snazzy 19-inch wheels, but because all the PE gear is fitted locally, each car comes on the big boat from the Fatherland wearing its standard 18-inch rims.

To save itself from having 60 pairs of M140i rims cluttering up its warehouse, BMW Australia provides buyers with both sets of rims, so with our long-termer reaching the end of its tenure it was time to swap. If you’re wondering why we’d bother, the answer is that the two rim sizes wear different rubber.

The standard 18s use Michelin Pilot Super Sports, while the 19s are fitted with Pirelli P Zero run-flats. That said, it wasn’t long before I was wondering why I bothered. As tyre swaps go it was about as far from the two-point-something-second efforts of various F1 teams as you could imagine.

2017-BMW-M140i-Performance-Edition-rear.jpgThe first unfortunate discovery was the lack of any tyre-changing equipment in the back of the BMW. A visiting Audi press car donated a tyre iron and a trolley jack was found, only to find the latter wouldn’t fit under the front bumper.

Thankfully, it j-u-s-t squeezed under the side sills and around 30 dirty, sweaty minutes, a few skinned knuckles and many curse words later the M140i was wearing a shiny new set of boots. This is why the rattle gun was invented. So, did the car feel any different? Yes, a little. It certainly looked different.

The 19s are a nice design (though time-consuming to clean) and fill the guards better, but I’m actually quite a fan of the standard 18s. (While we’re on the topic of looks, I can’t understand the hate for the 1 Series’ styling.

2017-BMW-M140i-Performance-Edition-headlights.jpgThe initial F20 design, with its squinty headlights, was a bit of an eyesore, but since the facelift it just strikes me as a fairly inoffensive five-door box.) Differences between the two tyres’ behaviour were slight.

As a more sporting tyre, the Michelins gave greater outright grip, though were also a little more abrupt when they started to slide, and the taller sidewall (40-series vs the Pirelli’s 35-series) and non-runflat construction gave the car a bit more compliance, though the margins were small.

With a gun to my head I’d take the Michelins, but honestly I’d probably keep the 19s on for road use and keep the spare 18s for the track, one place we sadly didn’t get to venture during our time with the M140i PE. Nonetheless, it’s easy to come to a conclusion about the M140i.

2017-BMW-M140i-Performance-Edition-exterior.jpgIt’s absolutely one of our favourite hot hatches, the combination of that smooth and super-grunty turbo straight-six and rear-drive handling never failing to bring out the inner hoon and enticing you to drive that little bit more enthusiastically than is really necessary.

It has the roll-on pace to stick with the likes of the Audi RS3 and Mercedes-AMG A45, yet is more involving and thanks to a recent price cut to $59,990 for the base car, miles cheaper than both. The Performance Edition is a harder sell.

2017-BMW-M140i-Performance-Edition.jpgIt’s a good value package, especially when you price up the various components individually, and the inclusion of the limited-slip diff on the 15 manual cars is an inspired choice – we stick by our assertion it should be standard fit.

Want to see more of our BMW M140i long-termer?

The rest – M Performance exhaust, carbon and Alcantara interior bits, 19s, etc – is nice if you’re after something more exclusive, but personally I’d be very happy buying a standard M140i, ticking the heated cloth seats box and spending the money saved on that chunk of metal in the rear axle.

Either way, it’s a great car, buy one while you can.

MONTH FOUR

Fuel this month: 11.2l/100km
Average: 11.6l/100km
Distance this month: 1321km

Liked: Michelins make it a better car
Disliked: Spending an hour changing tyres

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