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Mercedes announces SLS Black Series

November 12 2012 00:00  2448 views
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The fastest Mercedes-Benz-badged car in the world is about to get a whole lot hotter. And more expensive.With the paint still wet on its SLS GT, AMG is showing the world the even faster, even angrier SLS Black Series.

With more power, less weight, tauter handling and, bizarrely, a lower top speed, AMG claims its fifth Black Series model will bring the handling package of its SLS GT3 racecar onto the road. Another 59 horsepower has been tickled out of the 6.2-liter V8 relative to the standard SLS to peak at 622 hp, a figure that is also 39 hp upstream of the just-released SLS GT. Weighing in at 3,417 pounds, the Black Series process has slashed 154 pounds from the standard SLS AMG. AMG combines this with an upgraded version of its seven-speed paddle-shift transmission, a coil-over suspension system, carbon-ceramic brakes, stickier tires and an electronically locking differential to create one of the most potent rear-wheel-drive cars it's ever built.

It results in a snarling, snorting monster that tops out at 196 mph, but AMG insists the SLS Black Series does its best work in corners. It also has a shorter final-drive ratio than the standard SLS or the SLS GT (which explains its slightly slower top speed). It features wider, more aggressive bodywork, bigger air intakes, darkened headlights, deep front and rear undertrays, a massive air outlet carved into the hood and a large rear diffuser. For those who aren't so concerned with elegance, there's also the option of a huge, race-bred rear wing.

The already lean internals of the all-alloy V8 have been overhauled, with a new valvetrain comprising more aggressive camshafts and motorsports-style lightweight bucket tappets.

A freer breathing intake tract helps the engine's maximum speed jump from 7,200 rpm to a more racelike 8,000 rpm. However, the Black Series pays a price in peak torque, which not only falls from the SLS GT's 479 pound-feet to 468 lb-ft, but arrives 750 rpm later in the rev range, too.

The Black Series AMG's bottom end has also been modified. Larger-diameter oil galleys have been drilled in the crankshaft, and new bearings and stronger connecting rod bolts have been fitted to cope with the higher peak engine pressures. The entire oil and water pumping systems are upgraded, including a new oil pump.

But the most innovative change to the engine is actually outside the block, with AMG adding a gas strut brace between the engine and the body to stop it from moving under load changes. On a racetrack, this system is supposed to stiffen or slacken to compensate for "undesired load change reactions in highly dynamic driving on the racetrack," according to AMG Development Boss Tobias Moers.

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