Currently reading: Mercedes A45 AMG: details revealed
Mercedes A45 AMG gets 330bhp and all-wheel drive offering 0-62mph in 4.9sec. Mercedes claim it will have the fastest cornering speeds in its class

Mercedes-Benz has confirmed limited details to its most affordable performance model to date – the Mercedes-AMG A45 (2013-2018).

Set to go on sale in early 2013, the Audi RS3 and BMW M135i rivaling hatchback sits at the top of the new third-generation Mercedes A-class line-up at an unconfirmed price that is expected to start at around £35,000 in the UK.

The first series production AMG model with a transversely mounted engine runs a heavily tuned version of Mercedes-Benz’s turbocharged 2.0-litre four-cylinder petrol unit, as used in the standard A250 Sport set for UK sale by the end of the year.

With a specially developed free flow cylinder head and unique induction system among a myriad of other power boosting modifications, the M270 Evo designated unit is claimed to deliver 330bhp and what AMG describes as "maximum torque significantly above 295lb ft".

Developed in partnership with the German car maker’s High Performance Engine offshoot based in Brixworth, England, the new engine is the most powerful four-cylinder ever placed in a Mercedes production model. 

"Our goal right from the start was to match the output of the larger turbocharged 2.5-litre five-cylinder engine used by the RS3," says Tobias Moers, head of development at AMG.

By way of comparison, the RS3’s EA255 engine delivers 335bhp and 332lb ft torque, while the M135i, which is powered by an uprated version of BMW’s N55 turbocharged 3.0-litre six-cylinder unit, pushes out 316bhp and the same 332lb ft. 

As first revealed by Autocar, the A45 AMG channels its drive through a seven-speed dual clutch gearbox and, in a layout that mirrors that of the RS3, a specially tuned Haldex-style multi-plate clutch to all four wheels. 

To provide the new car with typical rear-wheel drive AMG handling traits, the engine’s torque is delivered primarily to the rear wheels under load.

No performance claims have been made prior to the A45 AMG’s official unveiling at AMG’s Affalterbach headquarters in Germany this week, but Mercedes-Benz insiders suggest it will match the claimed 0-62mph time of the M135i, which BMW puts at 5.1sec for the six-speed manual equipped version.

The inclusion of fuel saving features such as automatic stop/start and brake energy recuperation also has Mercedes-Benz claiming the A45 AMG will be the most economical car in the hot hatch ranks.

In a bid to provide the price leading AMG model with class leading dynamics – including what one AMG insider described to Autocar as "the highest corner speeds among its rivals", AMG’s engineering team has provided it with a largely unique chassis set-up – the likes of which has undergone extensive testing both on the road and at the Nürburgring

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The basic components of the MacPherson strut (front) and multi-link (rear) suspension are carried over from the A250 Sport but the elastokinematic properties, including the bushes used to attach it to the body structure, have been greatly altered. Other changes include wider tracks, firmer springs and dampers, larger diameter anti roll bars and reduced ride height. 

The standard electro-mechanical steering system has also been reworked for added on-centre sensitivity and a meatier feel, while the brakes have been upgrade with larger crossdrilled and vented discs as well as more powerful calipers.

As with other recent AMG models, the A45 AMG also receives a three stage electronic stability program (ESP) that includes a "sport handling" mode which allows you to turn the electronic safety net off completely.

The A45 AMG is differentiated from standard third-generation A-class models by an extensive body kit. Included is a deeper front bumper, altered grille, widened front fenders, carbonfibre look exterior mirror housings, wider sills underneath the doors, a prominent spoiler atop the rear hatch and new rear bumper with an integrated diffuser element as well as characteristic chromed tail pipes. 

Inside, the new car receives an upgraded interior with unique front sport seats along with more upmarket trims.

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RBH58 14 June 2012

RWD bias isn't possible

I repeat, you will not get RWD bias with this type of Haldex setup. If the front and rear wheels have the same amount of available grip, it's mechanically impossible to push more than 50% of the power to the rear wheels.

RBH58 13 June 2012

@Azarian  The reason the

@Azarian  The reason is that the Veyron's Haldex is a completely different setup. The way that Haldex is most commonly applied (and as it is in the A45, Golf R, TT quattro's) is as a way to provide drive to the rear wheels of what is essentially a FWD transaxle. It does this by taking a driveshaft to a rear mounted Haldex clutch pack which can regulate whether the rear wheel get zero drive variably through to them being locked to the front wheels giving a 50:50 split. As is it impossible to reduce the torque going to the front wheels, 50% is the most RWD bias such a setup can provide (unless the front wheels lose grip). Haldex claim that up to 100% of the drive can be chanelled to the rear wheels but this can only occur when the front wheels have ZERO traction (like when they are no longer on the ground for example). "RWD bias" is technically impossible to achieve with this setup. This sort of Haldex setup is essentially FWD most of the time, with the rear wheels getting engaged as required when the Haldex controller determines that the front wheels may soon be in need of assistance. It's technically very clever, but it's not "true" AWD like the Subaru or Audi Torsen designs which have a centre differential and can apportion more drive to the rear than the front.

K1NZ 12 June 2012


I dont think A45 AMG rolls or the tounge quite as nicely as say S63 AMG or ML63 AMG, anyway sounds like its going to be a seroiusly hot hatch but all the power in the world dosent make it the best drive in the class.