Mercedes-Benz A-Klasse (W 176) 2015Mercedes-Benz A-Class (W 176) 2015

Mercedes-AMG boss, Tobias Moers, has revealed to motoring.com.au that the current-generation M133 turbocharged 2.0 litre four-cylinder engine found in the Mercedes-AMG A 45 has achieved its maximum power output and that there is no more room for improvement. “That’s it for this generation, we’ve squeezed everything we can and the turbocharging technology is at its very limit,” he told the Aussie automotive portal.

Its replacement is reportedly already under development with the Mercedes-AMG High Performance Powertrains department – yes, that very same body responsible for engineering and putting together the turbocharged hybrid 1.6 litre V6 engine found in the Mercedes AMG Petronas F1 Team‘s race machine.

One of the key reasons for the team’s involvement this time round is due to the amount of experience garnered by the Northamptonshire-based engineers in developing the ERS and KERS systems. It is understood that the next-generation turbocharged (and possibly downsized) four-cylinder engine will feature the above mentioned technologies in some form or another.

Mercedes-Benz A-Klasse (W 176) 2015Mercedes-Benz A-Class (W 176

With that said, Moers reiterated that there is very little chance the next-gen engines will feature electronically-driven turbochargers despite arch rival Audi’s consistent efforts in refining said technology. “There’s great limitations to the technology. Sure, we’ve experimented with it but it needs more power than a standard car’s 12V electrical system and would need to carry extra batteries,” commented Moers.

“We tried adding an electric fan to a regular turbo which gave us some advantages,” he added. However, Mercedes-AMG finds that said advantages were too marginal to justify the amount of engineering work required to fully realise the performance targets. As a reminder, the current mill featured in the facelifted A 45 pumps out a total of 381 hp at 6,000 rpm and 475 Nm of torque at 2,250 to 5,000 rpm.

GALLERY: Mercedes-AMG A 45 facelift

GALLERY: Mercedes-Benz A 45 AMG on Vossen VFS2