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BMW M4 CS review - the best M4 yet?

Stuart Gallagher
10 Jul 2017
Verdict:

Not as extreme as the GTS, the M4 CS is the best F82 M4 to date, with a chassis that can be enjoyed and exploited

Evo Rating: 
Price: 
£89,130
For 
One of the best all-round M4s yet
Against 
It comes at a price
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The BMW M4 should be the very essence of evo. Front-engined, rear-wheel drive and with enough power and torque from its turbocharged straight six to offer a perfect balance between brilliant and challenging. Unfortunately, the M4 has always been more challenging than brilliant, struggling to deploy that power and torque cleanly and smoothly through its rear tyres thus robbing the driver of one of BMW’s ultimate driving experiences. 

Which brings us to the M4 CS, a lighter M4 with more performance and a chassis and steering set-up that has been optimised to get the best from the whole package. The big question is, has BMW finally created the car the M4 should have been from its launch?

Machinerynical highlights 

Taking the lower and stiffer springs, dampers and anti-roll bars from the M4 Competition Pack, the only other hardware changes made to the M4 CS is the fitment of 265/35x19s at the front and 285/30x20s at the rear fitted to lightweight forged wheels. Wrapped with Michelin’s track orientated Pilot Sport Cup 2 tyre (Pilot Sport 4 tyres are available as a no cost extra) the work of Frank van Meel and his team was focused on tuning the CS’s chassis to get as much from those tyres as possible.

To this end, both the M Adaptive Dampers and the electronic power steering have been reprogrammed to suit the tyre’s characteristics. Those front tyres were chosen to improve the car’s steering precision, the wider and larger rears to increase grip and get more from the Active M Differential. The aluminium front and five-link rear suspension are identical to that of a 2018 model year M4 Competition Pack. 

The only mechanical change to the powertrain is the fitment of a more free flowing exhaust system.

> BMW M4 GTS review

Away from the dynamic upgrades the M4 CS is also the recipient of a number of weight saving options. The front bonnet has a large air vent positioned ahead of the power dome to draw cooling air through the new front apron, itself featuring a larger air intake. Manufactured from carbonfibre-reinforced plastic the CS’s bonnet is 25 per cent lighter than an M4’s bonnet. There’s also a carbon-fibre front splitter and the roof skin is made from the same material. At the rear there’s a gurney rear spoiler and a diffuser both formed from carbonfibre. Combined with the lighter front seats and naked door cards from the GTS the new CS is 32kg lighter (1580kg) than an M4 fitted with a DCT gearbox.

Engine, performance and 0-60mph time

Sitting between the Competition Pack and last year’s extreme GTS and DTM editions the CS has also had a laptop plugged into its engine’s ECU, resulting in an additional 10bhp (raising power to 453bhp produced at 6250rpm) and a peak torque figure of 442lb ft available from 4000-5380rpm, a 37lb ft increase.

Only the seven-speed M DCT dual clutch gearbox is offered with the CS due to the need to chase numbers, which are quoted at 3.9-seconds to 62mph (against a regular M4 at 4.2-seconds), a 174mph maximum and a 7min 38sec Nurburgring lap time.

What’s it like to drive?

The changes BMW has made to the 18-model year M4 Competition Pack are impressive enough. Gone is that layer of disconnect that the original car possessed, you no longer struggle to find the confidence required to dig deep into the M4’s reserves and enjoy its obvious talents. There was always a frustration that the M4 had much to give but BMW had made it frustrating to access it. The Competition Pack addresses these issues, the new CS improves on this further still. 

 

There’s a new found level of focus and precision to the CS. Within only a few miles of committed driving it becomes clear that van Meel and his team has poured over every detail of the M4’s DNA and improved upon it.

> BMW M4 Competition Pack review

Take how the car reacts to your steering inputs and turns in. Where previously there was an uncomfortable dead spot where it seemed to take a moment too long for the front tyres to react, the CS addresses this with a clarity and level of precision that creates instant confidence. The gripper compound of the Cup 2 tyres are an obvious factor but the steering and set-up changes provide greater confidence to commit on turn in and a much clearer sense as to how the front tyres are working.

Once hooked into a corner the CS feels so much more stable and better balanced, too, the chassis allowing you in to position it so much more cleanly at the apex and ultimately get on the power and work on your exit speed. Not always something that’s been possible in an M4. 

In the past deploying the M4’s turbocharged shove was always a bit of a hit and miss affair. Too generous with your right foot and either the traction control went into hyperdrive, or if switched off the rear tyres could easily be vaporised. It was as frustrating on the road as it was impressive for the cameras on the track. In the CS, there’s none of this. Okay, you can play the hooligan if you wish, but it’s so much more rewarding and satisfying to be able to open the throttle earlier in the corner and drive through the exit, feeling the diff hooking up and the chassis working the load with new found precision.

Being able to drive the CS back-to-back with the latest M4 Competition Pack on the former’s launch highlighted that a 10bhp gain counts for nothing. However, that punchy torque increase provides the CS with a stronger top end to enjoy.

> Mercedes-AMG C63 S Coupe review

There are a couple of downsides, however. The seven-speed M DCT is beginning to feel old and a bit slow compared to its rivals and with the transfer to an eight-speed auto for the forthcoming M5 we expect the next M3/4 to go the same way. It’s a shame, because when hooked up and on it the M DCT is a good to use, but away from foot to the floor driving it can be frustrating. 

It’s a similar situation with the brakes. The CS comes as standard with cast discs with four-piston calipers at the front, two at the rear and put simply they are not a match for the car’s performance. The biggest criticism is it takes very few committed stops for the pedal travel to lengthen, and while retardation doesn’t suffer at a similar rate it removes the precision required to get the CS slowed and turned in. Ceramics would seem the obvious option to go for.

The savage torque delivery that M4s of old would offer up was less of an issue out on track. They were always traction compromised and setting a fast lap time was all about taming oversteer, but acres of space and a smooth surface meant it was manageable.

However, the wider, stickier tyres, as well as the minor chassis tweaks, of the CS mean that it finds significantly more traction on the exit of a corner than the old M4 could ever hope for. If you aren’t right on the limit of the tyres entering a corner the CS, almost always, allows you to use full throttle right from the apex without burning up the rear tyres.

Brake later, carry more speed and bring the CS closer to the edge of grip and you can overwhelm the rear tyres easily. But, rather than simply spin the rear tyres needlessly, the CS gives you the ability to use the throttle to manipulate your line and precisely keep the car right on the edge of traction.

There’s even a degree of control once the tyres have lost grip; the revs don’t flare instantly and the rear wheels continue to thrust you forward as they claw away at the tarmac.

What’s more, improving rear-end grip hasn’t had a detrimental effect on the M4’s balance. The front-end’s reluctance to understeer was, by far, the most impressive attribute of the previous non-CS models, that characteristic hasn’t been eroded in the pursuit of greater rear traction and the CS has a laser sharp front-end.

As we haven’t been impressed with the CS’s steel stoppers on the road, you’d expect the standard brakes to be miserable on track. Thankfully, they’re not too bad. After a few laps of hard driving you can expect the pedal to become squishy and indistinct, taking away much of the confidence you have in the brakes. However, despite the long pedal, there’s still enough power to slow the car from high speeds when you need to. A firmer pedal for longer would give you the assurance you want went driving a car on track, hopefully the optional ceramic brakes would offer this.

Verdict, price and rivals

£89,130 is an obscene amount for an M4, even one that won’t be built in great numbers (the car isn’t a limited run model but production will be kept to a minimum by factory capacity). It’s an especially hard figure to swallow when the new M4 Competition Pack answers many of our criticisms of the standard M4. But the CS is mightily impressive, not only in the way it drives but how it makes you feel; it is the best M4 you can currently buy. The pared back interior is special enough to stand out without the impracticality of the more extreme GTS.

Neither Mercedes-AMG nor Audi offers a model such as the M4 CS, with the £70,385 C63 S and new £62,900 RS5 both aimed squarely at the M4 and M4 Competition Pack. Jaguar’s £89,980 F Type R wouldn’t know which way a CS went.

Perhaps the nearest rival to the M4 CS is Porsche’s £87,335 911 Carrera S, a twin-test we need to set up sooner rather than later. 

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