Powered by racing-proven LS7 V-8 and TREMEC TR-6060 six-speed transmission
GM Corporate Newsroom / March 27, 2013
(Photo courtesy GM Media Archives)
The racing-proven LS7 7.0L V-8 powers the all-new 2014 Camaro Z/28 – the most track-focused production model in the car’s history. It’s matched with a TREMEC TR-6060 six-speed manual transmission with unique gearing tailored to the LS7’s performance characteristics for optimal track performance.
The Z/28 engine is adapted from the LS7 used in the C6 Corvette Z06, which was developed in conjunction with Corvette Racing. It is rated at an estimated 500 horsepower (373 kW) and 470 lb.-ft. of torque (637 Nm) in the new Camaro Z/28, with a maximum engine speed of 7,100 rpm – a broad rpm range that contributes to higher power and allows the driver to hold gears longer between shifts on the track. That helps keep the engine at peak power for quicker lap times.
The LS7 is mated to a TREMEC TR-6060 six-speed manual gearbox that features close-ratio gearing - optimized for the engine’s power characteristics. The TREMEC is coupled with a 5.1:1-ratio short-throw shifter to ensure quick and precise feeling shifts
Power is distributed to the rear wheels via a limited-slip differential, which features a helical gear set rather than traditional clutch packs. This continuously adjusts torque bias allowing drivers to confidently lay down more power to get through corners faster. Coupled with the Performance Traction Management (PTM) system, drivers can adjust the level of throttle and brake intervention to match their capability and driving environment, essentially making PTM custom to each driving situation.
Z/28 features a cooling system designed for the track — standard. This incorporates the dry-sump oiling system for the LS7, which connects to an integral liquid-to-liquid cooling system for engine oil. Another liquid-to-liquid system provides cooling for the transmission and differential.
“The LS7 lives on in the all-new Z/28, extending a performance legacy while delivering great power density in a lightweight package to give this exciting new Camaro a great feeling of control and balance,” said John Rydzewski, assistant chief engineer for small-block engines. “It introduced exotic materials and racing-influenced solutions that keep it at the forefront of high-performance technology.”
The LS7 is the most powerful naturally aspirated production engine ever from General Motors and, upon its launch in late 2005, was the first GM engine to receive SAE-certified power ratings.
“In the Camaro lineup, it complements a range of great V-8 choices, starting with the 426-horsepower LS3 in the Camaro SS and ending with the supercharged LSA rated at 580 horsepower in the Camaro ZL1,” said Rydzewski. “The LS7’s low mass and high rpm capability make it the perfect choice for the lightweight, track-enabled Z/28, exemplifying all the strengths and attributes of the small-block architecture.”
Hand-assembled at GM’s Performance Build Center, in Wixom, MIch., the LS7 shares the basic Gen IV V-8 architecture as the Camaro SS’s 6.21 LS3 engine, but it uses a unique cylinder block casting with pressed-in steel cylinder liners to accommodate the engine’s larger diameter, 104.8mm cylinder bores – with deck-plate boring and honing for optimized gore geometry. It also uses a dry-sump oiling system to ensure full lubrication during the 1.05-g cornering loads the Z/28 is capable of producing.
Internally, the LS7’s reciprocating components use racing derived lightweight technology, including titanium connecting rods and intake valves, to boost horsepower and rpm capability – and reduce overall engine mass. The titanium connecting rods provide perhaps the most direct link from the racetrack. They weigh just 464 grams apiece, almost 30 percent less than the rods in the LS3. Besides being lightweight, which enhances high-rpm performance and rpm range, titanium makes the rods extremely durable.