A compact sports hatch with 188bhp per litre…
The McLaren 675LT provides 666bhp from an engine displacing just 3.8 litres, each litre of which being therefore responsible for the provision of 175bhp. Pretty impressive, but perhaps not so far from the realm of expectation for a limited-edition, track-focused McLaren costing £260,000. More surprising is when that output per litre is beaten by a five-door, five-seat hatchback costing less than one sixth of the price. But that is what we have here with this renewed 376bhp, Mercedes-AMG A45, whose litres provide 188bhp each.
That’s a 20bhp improvement on the previous, hardly slothful A45 and I wonder whether Mercedes would have felt the need to make the change had the car not been eclipsed in power terms (if few others) by Audi’s new RS3. But there will always be some who will insist on having the most powerful car in whatever class they are shopping in, so I guess we should not be too surprised by Mercedes’ willingness to take advantage.
The fact Mercedes is able to squeeze so much power from such a tiny engine and leave it so mannered is altogether more surprising. A few years ago I saw one of these engines screaming away on a test bed during one of those tests where they put a metaphorical brick on the throttle and come back a week later to see what’s happened. The exhausts looked like the molten core of the earth but, as the man proudly told me at the time, “We just can’t seem to break it.” So they gave it some more power and, now, even more again.
Now this hatchback will out-accelerate a brand-new twin-turbo Porsche 911 Carrera S even if you equip said Porsche with paddle shift gears and launch control. And because of the context in which such crazy thrust arrives, it really will make you gasp. On a private facility I informally timed it from 0-100mph in less than 10sec, the first time I have ever known any such car get close to single digits over such a measure.
So it’s fast, but is it funny? More so than the car it replaces, which Mercedes appeared to think so quick it had better be tuned to understeer everywhere just in case it all got too much for the driver. The A45 feels agile now and quite engaging, even if ultimately it lacks the pure chassis fluency of a BMW M235i or even a VW Golf R. Both are far slower and less powerful but, to me at least, more pleasurable cars to drive fast.
But if what you really want is the ultimate pint-sized rocketship, a quite practical, surprisingly frugal, tolerably comfortable, adequately refined point to point missile, its only true rival for now is the Audi RS3. It’s a better bet than that, and by far.
Engine 2.0 litres, 4 cylinders, turbocharged
Power [email protected] rpm
Torque 350lb [email protected] rpm
Transmission seven-speed automatic, four-wheel drive
Power to Weight 242bhp per tonne
Top speed 155mph
This year's Inter-register
In this year's Inter-register contest, an idea suggested by Motor Sport 'centuries ago' so that one-make clubs could compete against one another in various tests, only two points divide the…
Lola ready for Leslie
Former touring car and Le Mans racer David Leslie plans to give his rebuilt Lola Mk1 sports-racing car its debut later this summer. Leslie acquired chassis BR32 in 1999 and…
Fangio and Publicity
Fangio, most modest of world champions, comes in for publicity of various kinds. This isn't his fault; it is the penalty of fame. Instead of devoting space to pictures which…