This is the first Corvette Z06 to offer a supercharged engine, an eight-speed paddle-shift automatic transmission and, thanks to a stronger aluminum frame, a removable roof panel.
It stretches the performance envelope for Corvette with unprecedented levels of aerodynamic downforce – and it is the first Corvette Z06 to offer a supercharged engine, an eight-speed paddle-shift automatic transmission and, thanks to a stronger aluminum frame, a removable roof panel.
The new LT4 supercharged 6.2L V-8 engine is SAE-certified at 650 horsepower at 6,400 rpm and 650 lb-ft of torque at 3,600 rpm – making the 2015 Corvette Z06 the most powerful production car ever from General Motors and one of the most powerful production cars available in the U.S.
For the first time since 1963, the Z06 is also offered in coupe and convertible models.
In fact, building a modern Z06 Convertible was only enabled by recent technological advancements, according to Corvette chief engineer Tadge Juechter.
To maintain the Z06’s mass and performance targets, the LT4 engine was designed with a more-efficient, more-compact supercharger.
Even with its integrated supercharger/intercooler assembly mounted in the valley between the cylinder heads, the engine is only about one inch (25 mm) taller than the Corvette Stingray’s LT1 engine – while delivering nearly 37% more horsepower and 40% more torque.
A new 1.7L supercharger spins at up to 20,000 rpm – 5,000 rpm more than the supercharger on the Corvette ZR1’s engine, helps launch the Z06 Corvette into supercar territory.
The rotors are smaller in diameter, which contributes to their higher-rpm capability – and enables them to produce power-enhancing boost earlier in the rpm band. That boost is achieved more efficiently via a more direct discharge port that creates less turbulence, reducing heat and speeding airflow into the engine.
The LT4 engine also has several unique features designed to support its higher output and the greater cylinder pressures created by forced induction, including:
• Rotocast A356T6 aluminum cylinder heads that are stronger and handle heat better than conventional aluminum heads;
• lightweight titanium intake valves;
• machined, forged powder metal steel connecting rods for reduced reciprocating mass;
• a high 10.0:1 compression ratio – for a forced-induction engine – enhances performance and efficiency and is enabled by direct injection;
• forged aluminum pistons with unique, stronger structure to ensure strength under high cylinder pressures;
• stainless steel exhaust manifolds that offer greater structure at higher temperatures;
• a lightweight aluminum balancer; and,
• a standard dry-sump oiling system with a dual pressure-control oil pump.
The supercharged LT4 is offered with a standard seven-speed manual transmission with Active Rev Match, or an all-new 8L90 eight-speed paddle-shift automatic transmission designed to enhance both performance and efficiency.
Source: General Motors