New Mercedes-Benz SL65 AMG Sports Bi-Turbocharged V12 with 621-Horses

You would be inclined to believe that Mercedes-Benz had the top end of the market covered with its new 2013 SL63 AMG that's motivated by a twin-turbocharged 5.5-liter V8 producing 530hp (537PS) in standard form and 556hp (564PS) with the optional AMG Performance Package. Well, that's not the case as there's always a number of buyers who don't mind paying something extra to get more of everything and here's where the flagship SL65 AMG fits in.
Under the bonnet, there's an updated version of Mercedes-Benz's 6.0-liter bi-turbo V12 engine sporting new turbochargers, manifolds and an exhaust system that's 3.2kg (7 pounds) lighter.
The twelve-cylinder engine's output is up by 18hp to 621hp (630PS) available from 4,800 to 5,400 rpm while peak torque stands at 1,000Nm (737 lb-ft) between 2,300 and 4,300 rpm.
An AMG SPEEDSHIFT PLUS 7G‑TRONIC with four different driving modes including Controlled Efficiency (C), Sport (S), Sport plus (S+) and Manual (M), transfers power to the rear wheels.
As with the rest of the SL range, the use of an all-aluminium bodyshell results in a significant reduction in weight with the new SL65 AMG being some 170kg (375 pounds) lighter than before. Of course, with a curb weight of 1,950kg (4,300 pounds) the SL65 AMG is no featherweight either.
Mercedes quotes a 0 to 100 km/h acceleration time of 4.0 seconds with the 200 km/h mark attained after just 11.8 seconds. The roadster model's top speed is electronically limited at 250 km/h.
Not that any typical buyer of an SL65 AMG will care about the car's fuel consumption, but nevertheless, according to Mercedes, it returns a combined economy of 11.6lt/100, equal to 20.3mpg US or 24.4mpg UK.
The new SL 65 AMG also gets Merc's ABC active suspension system, beefier brakes with six-piston fixed calipers up front and single-piston sliding callipers at the rear, a 3-stage ESP, and 19-inch wheels wrapped in tires size 255/35 at the front axle and 285/30 at the rear.
The market launch of the new SL 65 AMG will take place in September 2012 with pricing in Germany (including 19% tax) starting from €236,334 (US$308,580). Mercedes has not yet announced U.S. pricing.

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Mercedes-Benz SL63 AMG

The new Mercedes-Benz SL 63 AMG roadster made its first appearance this morning when F1 drivers Michael Schumacher and Nico Rosberg presented the car at the German team's official Formula One test in Barcelona, Spain, ahead of its world premiere at the 2012 Geneva Motor Show in early March. At the heart of the high-performance version of the new SL is AMG's new M157 engine, which is used on a variety of other Mercedes models such as the CLS 63 AMG sports saloon and the ML 63 AMG SUV.
The 5.5-liter twin-turbocharged V8 unit is good for 529bhp and 590 lb-ft of torque, propelling the hardtop roadster from standstill to 60mph (96km/h) in 4.2 seconds en route to an electronically governed top speed of 155mph (250km/h).
There's also an optional AMG Performance package that boosts output to 550bhp and 664 lb-ft, while reducing the 0 to 60mph time to 4.1 seconds and allowing the SL63 AMG to reach a maximum velocity of 186mph (299km/h).
Power is transferred to the rear wheels via a seven-speed AMG Speedshift. automatic transmission.
The new generation SL's lightweight chassis made out of aluminum and magnesium has helped shave 275 pounds off the outgoing model, something that not only improves performance but also reduces fuel consumption – by up to 30 percent over the previous SL 63 AMG, says Mercedes.
A beefed up braking system with six-piston calipers up front and single-piston calipers at the back along with a reworked suspension, 19-inch alloy wheels shod in high-performance tires, and unique AMG touches inside and out, round out the package.

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