Tuners of different kinds and origins keep introducing more and more upgrade programs for the much-adored Chevrolet Corvette Z06 supercar, the sixth generation of the legendary sports car. This time, the Troy, Michigan-based Specter Werkes company decided to equip the ‘Vette’s 7.0-liter LS7 engine with a twin-turbo system by Lingenfelter Performance Engineering making it perhaps one of the most powerful street-legal Corvettes in the human history.
With the twin-turbo kit, which is built around a pair of Garrett GT30 ball-bearing turbochargers, upgraded exhaust manifold and an air-to-air intercooler, installed, the LS7 gets its power increased from 505 hp to almost mind-blowing 800 horsepower. According to some sources, the engines impressive torque of 470 lb-ft (640 Nm) has also been increased to 800 Nm, but I failed to find independent confirmations regarding this claim.*
Oct 31, 2009 Update: Specter Werkes’ representative Mr. Matt Shipes has just replied to my inquiry. He says that the engine actually develops 800 TQ on the crankshaft, and the torque to the ground value is 669 lb-ft, which is still really impressive.
What’s more interesting about the kit is that none of them are alike. Lingenfelter claims that every vehicle that they plan to install the kit on will be dealt on an individual basis with each blower fine-tuned for respective engines and exhaust system. More than that, the engines themselves will be individually re-built before installation with forged-aluminum, lower-compression pistons and other parts that tend to fail first under an overwhelming pressure of a twin-turbo system.
Of course, the list of modifications also includes a custom Corsa/Specter Werkes low-restriction exhaust system, and a reprogrammed factory electronic engine control system.
To make driving the car easier and safer, the tuner equipped it with StopTech STR big-brake package sporting six-piston front calipers and four-piston rear calipers. With its huge and heavy engine under the long hood, the car may still not be particularly nimble and probably won’t beat a Porsche 911 with similar power to weight ratio, but I am sure that it will be a great fun to burn some rubber on a quarter mile.
Since SEMA show were always centered about impression that could be made upon visitors, not only technical ingenuity of engineering teams behind each vehicle, the package also features bits and pieces of aural and visual luxury including a Corsa exhaust system with custom made Concord-style exhaust tips and some leather and carbon-fiber accents to the vehicle’s interior and exterior.
The Specter Werkes/Sports GTR tuning package, which is available on all C6 Corvette supercars, even including the outrageous ZR1 version, will consist of a new, more aggressive-looking body kit with some parts made of light-weight carbon-fiber (the company doesn’t specify which variety of the feather-light material was actually used,) a set of HRE carbon-fiber wheels tipping the scales at just 22 lbs each and fitted with high-performance Michelin Pilot Sport PS2 Zero Pressure tires.
As far as I understand, this particular model is a one-off, but the Lingenfelter twin-turbo kit itself with labor and all modifications to the vehicle included costs around $50,000 USD, so you get the idea how expensive the whole Corvette GTR may be.
Photos: Specter Werkes