The Lowdown On The Vastly '08 Improved Corvette

America's Sports Car Receives A New LS3 6.2 L V-8 And A Host Of Driving And Interior Refinements

Courtesy of GM Apr 1, 2008 0 Comment(s)

LS7 Engine
The Z06's LS7 7.0L engine delivers 505 hp (377 kW) in a 3,132-pound (1,421 kg) package-a combination that delivers 0-60 performance of 3.7 seconds in first gear, quarter-mile times of 11.7 seconds at 125 mph, and a top speed of 198 mph (as recorded on Germany's Autobahn). It also provides maximum lateral acceleration of 1.04 g and 60-0 braking

Internally, the LS7's reciprocating components make use of racing-derived lightweight technology, including titanium connecting rods and intake valves, to help boost horsepower and rpm capability. The rpm fuel shut-off limit is 7,100 rpm. The LS7's details include:

>>> Dry-sump oiling system
>>> Unique cylinder block casting with large, 104.8mm bores and pressed-in cylinder liners
>>> Forged-steel main bearing caps
>>> Forged-steel crankshaft
>>> Titanium connecting rods with 101.6mm stroke
>>> Cast-aluminum, flat-top pistons
>>> 11.0:1 compression
>>> High-lift camshaft
>>> Racing-derived, CNC-ported, aluminum cylinder heads with titanium intake valves and sodium-filled exhaust valves
>>> Low-restriction air-intake system
>>> Hydroformed exhaust headers with unique "quad flow" collector flanges.

Drivetrain
The Corvette Z06's powertrain and drivetrain systems are matched to the LS7's performance capability. The light, four-into-one headers discharge into close-coupled catalytic converters and through two-mode mufflers. The mufflers each feature a vacuum-actuated outlet valve, which controls exhaust noise during low-load operation but opens for maximum power.

At the rear of the LS7 engine, a single-mass flywheel and lightweight, high-capacity clutch channel torque to the rear transaxle. The six-speed manual transmission has been strengthened to handle the LS7's increased torque load. The transmission includes a pump that sends transmission fluid to the front radiator for cooling. Upon its return, the fluid removes additional heat from the differential lube before returning to the transmission. The six-speed transmission connects to a limited-slip differential, with enlarged ring-and-pinion gears. Stronger axle half-shafts with tougher universal joints transmit power to the rear wheels.

Corp_0711_07_z 2008_corvette Trunk 1/8

Structure
The Z06 has a unique aluminum body structure for optimum stiffness and lightweight for the fixed-roof body style. Perimeter rails are one-piece, hydroformed aluminum members featuring cast suspension nodes, which replace many welded steel components on other Corvette models. Other castings, stampings, and extrusions are combined into the innovative structure with state-of-the-art manufacturing technologies.

Advanced structural composites featuring carbon fiber are bonded to the aluminum structure. The wider front wheelhouses, for example, are carbon composites, and the passenger compartment floors combine carbon-fiber skins with an ultra-lightweight balsa wood core.

The Z06 has a new magnesium cradle that serves as the attachment point for the engine and some front suspension components. Magnesium is lighter than aluminum yet incredibly strong. The magnesium cradle helps improve the front-to-rear weight distribution, as do the carbon-fiber front fenders and wheelhouses. As in 2007, the battery in the Z06 has moved from the underhood to a position in the rear cargo area, behind one of the rear wheels.

Suspension and brakes
The Z06 retains the 105.7-inch (2686mm) wheelbase of other Corvette models, as well as the short-long arm suspension and transverse leafspring design, but it rides on all-new wheels, tires, brakes, as well as its own rear spring and roll stabilizer.

The firmer suspension works harmoniously with large 18x9.5-inch, cast-spun aluminum wheels and 275/35ZR18 tires in the front, and 19x12-inch, cast-spun aluminum wheels with 325/30ZR19 tires in the rear-the largest wheel-and-tire combination ever offered on a Corvette. The tires use the latest extended-mobility technology from Goodyear to provide a satisfactory ride, but still allow the vehicle to achieve lateral acceleration of more than

1 g. The extended-mobility tires eliminate the need-and weight-for a spare tire and jack or inflator kit, while also reducing the chance of a sudden loss of handling capability.

Complementing the suspension system and large rolling stock is an equally capable four-wheel, disc-brake system, consisting of 14-inch (355mm) vented and cross-drilled front rotors and 13.4-inch (340mm) vented and cross-drilled rear rotors. A Delphi four-channel ABS system is standard, as is a competent active handling system, complete with a Competitive Driving mode.

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