BMW M5 2012 track review
By Philip King · 20 Mar 2012
When children grow too big for the sandpit, they move up to the swings; when a car outgrows ordinary roads, it goes to the track. Not just any track, but the Nurburgring.This is a playground in the satanic sense, a 21km "green hell'' according to former racer Jackie Stewart, that winds through the Eifel mountains in Germany. Just about any carmaker with a performance model goes there to wring the vehicle's neck. Then, when it goes on sale, they can say that it has been tuned at the most demanding place on earth. It's virtually a back yard for German makers and it comes up quickly when you start learning about BMW's new M5. For the fifth version of its performance luxury sedan, that's where it went.It needed to bed down stiffer double-wishbone suspension at the front and a rear axle mounted more rigidly, apparently.Then there's a trick rear differential that uses an electric motor and sensor input from the electronic stability system. But you get the feeling any excuse would have done. A production car that can rip around the Nurburgring in less than nine minutes is doing exceptionally well. BMW claims its M5 can do a sub-eight minute lap, without saying exactly how sub.That puts it among supercars, thinly disguised track specials, the most insane Porsches and the best Japan can offer, such as Nissan's GT-R. For a car weighing near-as-makes-no-difference two tonnes, that's a moon-shot. Thanks to the 'Ring, the M5 inhabits a realm between real world driving and Apollo 11. You won't get any idea of what it can do going from A to B on speed-limited roads. You need a road that only goes from A to A, and puts limits only on your daring. The closest we have to a green hell is the aquamarine purgatory of Phillip Island. You can see the ocean from much of this world-class track. But don't look. You're flirting with the devil and the deep blue sea.BMW's chassis engineers must have realised they had a job on their hands after they saw what the engine department had done. This car ditches the naturally aspirated 5.0-litre V10 from the previous model in favour of a smaller 4.4-litre V8, but adds turbocharging.It's the way everyone is going for just about every type of car because it reduces fuel consumption... by 30 per cent in this case. That isn't what you'll remember about the M5. You'll remember a little yellow light in the dash telling you the traction control is working overtime.Demand acceleration and it has no choice but to blink a reprimand. Turbocharging changes the nature of this car completely. The previous V10, motivated by BMW's less-than-stellar spell in Formula 1, revved stratospherically to 8250rpm - and needed to soar to deliver.This car has more power, up 39kW to a supercar-like 412kW, and it arrives sooner, at 6000rpm. But the big difference is in its torque, brought on by the twin-scroll turbo nestled in the engine V.This rises by 160Nm to 680Nm. Where 6100rpm was needed to access maximum torque previously, it now arrives at just 1500rpm. From virtually no revs, this engine wants to twist the rear axle.The result is ludicrously easy wheelspin, constantly reined in by the electronics. If you get traction, 100km/h arrives in 4.4 seconds. You can power through the overtaking zone from 100km/h to 200km/h in just 8.6 seconds. In a car this size and weight, that's extraordinary. Overseas, where the speed limiter can be removed, it will keep going to a Bentley-like 305km/h. Turbo-lag, that delay between right foot and forward motion, has been banished here. The engine also sounds glorious - unlike most turbos - even if the rev ceiling drops to a (relatively) modest 7200rpm and unless you're belting around a track, it's pretty quiet inside. The double-clutch transmission flicks through gears willingly, without the jarring of the previous automated manual system, and the enormous brakes (thankfully) hold up well. Except under the most extreme deceleration, the M5 is amazingly stable and predictable.A turbocharged 4.4-litre V8 was offered in a non-M version of the previous 5 Series, but this is the first time BMW's tuners have employed air pumps and in this respect, they follow a path already taken by Audi and Mercedes. The handling precision, though, is all BMW. For purists, it retains hydraulic steering rather than switching to electric, which is good. When it comes to the suspension tuning BMW has applied all the dynamic software it can find.As before, you can set the car up for different degrees of aggression but it's easier now and the dampers can be on max while the steering is on comfort if you want.For Phillip Island, I dial the throttle back from sport plus to sport, because that makes it less of a grenade, but leave the transmission and dampers on the shortest fuse. Of course the light still blinks.So I'm not game to entirely disengage the electronic stability control, which is on BMW's fence-sitting middle setting. A bit of wayward throttle on corner one and I'd be ocean-bound. You're aware of its weight and thanks to the head-up display, which projects information on to the windscreen, you're also aware of your speed when normally you wouldn't be game to glance down. Without that evidence, the two figures would not compute. But they do because the Phillip Island track feels ludicrously easy in this car. The front tyres have brilliant grip so you can have confidence they will stick where you point them. Ease off the throttle and the car instantly tightens its line.The M5 was nurtured in green hell but I'm in blue heaven.