The new 5.5L V8, codenamed M157, is smaller than the outgoing 6.2L V8, but it produces more power and torque, while being more fuel efficient. It puts out 537 horsepower compared to 518-h and puts out 590 lb-ft of torque compared to 464 lb-ft. for the 6.2L. There will also be a performance package upgrade available that will increase the output to 571-hp. The new S63 AMG will reach 0-62 mph in 4.5 seconds and has a governed top speed of 155 mph. The performance package model has a top speed of 186 mph.
“With the new AMG V8 biturbo engine and the AMG SPEEDSHFT MCT 7-speed sports transmission, we are confronting the challenges of the future and focussing on fuel consumption and exhaust emissions even more intensively than before. Our new high-performance engine shows that AMG occupies a leading position in terms of both efficiency and our brand commitment to “performance,” says Volker Mornhinweg, Chairman of Mercedes-AMG GmbH.
The new 5.5L V8 is based on the upcoming twin-turbo 4.6L V8 that will also be offered later this year.
Full Story: Autocar