The Corvette variant now officially known as the ZR1 was first reported by several print and online publications who were speculating that Chevrolet was developing a super high performance production version of the Corvette and were internally calling it “Blue Devil” (named after GM CEO Rick Wagoner’s alma mater, Duke University). Wagoner is quoted as saying, “I wonder what they can do for 100,000 dollars?” during a GM board meeting speaking about Chevrolet designers. The production version is expected to debut at the 2008 North American International Auto Show and be available as a 2009 model.

The ZR1 was formally announced in a December 2007 press statement by General Motors, where it was revealed that their target of 100 horsepower/liter has been reached by a new “LS9″ engine, an Eaton-supercharged 6.2-liter engine producing a confirmed 638 hp (476 kW) and 604 foot-pounds force (819 N·m) of torque with a sticker price of about US $100,000. The engine is the most powerful engine to be put in an American production sports car.[9] Top speed is 205 mph (330 km/h) Along with an improved motor, the ZR1 also comes with extensive carbon-fiber body parts, including (but not limited to) wider fenders, the hood, roof panel, roof bow, front fascia splitter and rocker moldings. However, the car is heavier and more front weight biased than the Z06 because of the supercharger, with a weight distribution of 52% at the front and 48% at the rear. Tires were also increased in diameter and width, along with bigger and stronger brakes, adjustable suspension, and optional chrome wheels and a premium interior package.

Spy photos from recent hot laps at Mazda Raceway Laguna Seca, following the 2007 American Le Mans Series final race, show the ZR1 to have carbon-ceramic brakes, extensive carbon fiber (front quarterpanels, A- and B- pillars, as well as the roof and possibly other body panels), and a full-width rear lip spoiler.

The 2009 Corvette ZR1 is an American supercar that brings the technology and engineering refinement of carbon-fiber, ceramics and electronics together in a distinctive design.

“Chevrolet’s goal with the new ZR1 is to show what an American supercar can deliver, at a price that trumps exotics that cost two, three or four times as much – and does so with exceptional driveability,” said Ed Peper, Chevrolet general manager.

The ZR1’s basic stats:

* All-new LS9 supercharged 6.2L V-8 rated at 638 horsepower (476 kW), and approximately 604 lb.-ft. of torque (819 Nm)
* Six-speed, close-ratio, race-hardened manual transmission
* New, high-capacity dual-disc clutch
* Higher-capacity and specific-diameter axle half-shafts; enhanced torque tube
* Specific suspension tuning provides more than 1g cornering grip
* Twenty-spoke 19-inch front and 20-inch rear wheels
* Michelin Pilot Sport 2 tires – P285/30ZR19 in front and P335/25ZR20 in the rear – developed specifically for the ZR1
* Standard Brembo carbon-ceramic, drilled disc brake rotors – 15.5-inch-diameter (394-mm) in the front and 15-inch-diameter (380-mm) in the rear
* Larger, blue-painted brake calipers with substantially increased pad area
* Standard Magnetic Selective Ride Control with track-level suspension
* Wider, carbon-fiber front fenders with ZR1-specific dual ports
* Carbon-fiber hood with a raised, polycarbonate window – offering a view of the intercooler below it
* Carbon-fiber roof panel, roof bow, front fascia splitter and rocker moldings with clear-coated, visible carbon-fiber weave
* ZR1-specific full-width rear spoiler with raised outboard sections
* Specific gauge cluster with boost gauge (also displayed on the head-up display) and 220-mph (370 km/h) speedometer readout
* Only two options: chrome wheels and a “luxury” package
* Curb weight of 3,324 pounds (1,508 kg)

The specialized components of the new ZR1 work harmoniously to deliver the most powerful and fastest automobile ever produced by General Motors.

“Preliminary testing shows the ZR1 builds on the highly respected Corvette Z06 in every performance category, from acceleration and braking to cornering grip and top speed,” said Peper. “It all boils down to the power-to-weight ratio and the ZR1’s is exceptional – better than the Porsche 911 GT2, the Ferrari 599 and even the Lamborghini LP640. In fact, the ZR1 is expected to be the first production Corvette to achieve a top speed of at least 200 mph.”

The ZR1 does more than reach 200 mph; it keeps going to a top speed of 205 mph (330 km/h).

Supercharged LS9 Engine

The new LS9 6.2L small-block engine is the power plant the supports the ZR1’s performance capability. The enabler of the LS9’s performance and refinement is a large, positive-displacement Roots-type supercharger with a new, four-lobe rotor design. It is augmented with an integrated charge cooling system that reduces inlet air temperature for maximum performance.

A sixth-generation supercharger helps the LS9 make big power and torque at lower rpm and carries it in a wide arc to 6,600 rpm, as it pushes enough air to help the engine maintain power through the upper levels of the rpm band – the area where supercharged performance tends to diminish. Heavy-duty and lightweight reciprocating components enable the engine’s confident high-rpm performance.

The LS9 is hand-assembled at GM’s Performance Build Center, in Wixom, Mich., and incorporates specialty processes typically seen in racing engines to produce a highly refined and precise product. For example, cast iron cylinder liners are inserted in the aluminum block and are finish-bored and honed with a deck plate installed. The deck plate simulates the pressure and minute dimensional variances applied to the block when the cylinder heads are installed, ensuring a higher degree of accuracy that promotes maximum cylinder head sealing, piston ring fit and overall engine performance.

Transmission and Axle

The LS9 engine is backed by an upgraded, stronger six-speed manual transmission and a twin-disc clutch that provide exceptional clamping power, while maintaining an easy clutch pedal effort. ZR1-specific gearing in the transmission provides a steep first-gear ratio that helps launch the car, and top speed is achieved in sixth gear – a change from the fifth-gear top-speed run-outs in the manual-transmission Corvette and Corvette Z06.

As the term implies, the twin-disc clutch system employs a pair of discs, which spreads out the engine’s torque load over a wider area. This enables tremendous clamping power when the clutch is engaged, while also helping to dissipate heat better and extend the life of the clutch.

The twin-disc clutch system also contributes to the ZR1’s exceptional driving quality, with smooth and easy shifting. The twin-disc system’s design allows higher torque capacity with inertia and pedal effort similar to the Corvette Z06. It enables a 25-percent reduction in inertia, thanks to smaller, 260-mm plates; the Corvette Z06’s uses a 290-mm single-disc system.

The rear axle also is stronger in the ZR1 and features asymmetrical axle-shaft diameters that were developed after careful testing to provide optimal torque management. The axles are also mounted on a more horizontal plane that correlates with the wider width of the rear wheels and tires.

Ride and Handling

The ZR1 is built on the same aluminum-intensive chassis as the Corvette Z06 and features similar independent SLA front and rear suspensions, with aluminum upper and lower control arms. Where the ZR1 differs is the suspension tuning, which was optimized for the car’s steamroller-wide front and rear tires.

Magnetic Selective Ride Control is standard and tuned specifically for the ZR1. The system’s ability to deliver a compliant ride with nearly instantaneous damping adjustments enabled engineers to develop a surprisingly supple ride quality in a supercar that still delivers cornering grip of more than 1g.

From a high-performance perspective, Magnetic Selective Ride Control helps the rear axle remain planted during launch for smooth, hop-free acceleration. It also helps suppress axle movement when cornering on broken or uneven pavement.

Brakes, Wheels and Tires

Commensurate with the ZR1’s engine output is the braking system, which is headlined by Brembo carbon-ceramic brake rotors. Found on only a few exotics and more expensive supercars, carbon-ceramic brake rotors are made of a carbon-fiber-reinforced ceramic silicon carbide material . Their advantage comes in low mass and resistance to wear and heat. In fact, the rotors should never show any corrosion or require replacement for the life of the vehicle, when used in normal driving.

The vented and cross-drilled rotors on the ZR1 measure 15.5 inches (394 mm) in diameter in the front and 15 inches (380 mm) in diameter in the rear – making them among the largest carbon-ceramic rotors available on any production vehicle.

Clamping down on the high-tech rotors are six-piston front calipers and four-piston rear calipers, each painted a ZR1-exclusive blue. The front pads are equivalent in size to the largest on any production car with a single-pad design – double that of the Corvette Z06’s 70-sq.-cm. front pads.

The brakes are visible through the ZR1’s exclusive wheels: 20-spoke alloy rims that measure 19 inches in diameter in the front and 20 inches in the rear. They come standard with a bright, Sterling Silver paint finish and chrome versions are optional. The wheels are wrapped in Michelin Pilot Sport 2 tires developed specifically for the ZR1, measuring P285/30ZR19 in front and P335/25ZR20 in the rear.

Exclusive Exterior

The ZR1 is instantly recognizable, with perhaps the most identifiable feature a raised, all-carbon-fiber hood that incorporates a clear, polycarbonate window. The window provides a view of the top of the engine’s intercooler, with the legend “LS9 SUPERCHARGED” embossed on the left and right sides, and an engine cover with the Corvette crossed flags logo debossed at the front.

The underside of the hood has a visible carbon-fiber-weave. Visible carbon-fiber is used on the roof, roof bow, rocker molding and front splitter. These exterior components are protected by a specially developed glossy, UV-resistant clear coat that resists yellowing and wear.

Widened, carbon-fiber front fenders with specific, dual lower ports; and a full-width, body-color rear spoiler incorporating the center high-mounted stop lamp are also unique to the ZR1. All of the exterior features were developed to enhance high-speed stability and driver control.

Interior Details

The ZR1’s interior builds on the brand’s dual-cockpit heritage, with high-quality materials, craftsmanship and functionality that support the premium-quality experience promised by the car’s performance. The ZR1’s cabin differs from the Corvette and Corvette Z06 with the following:

* ZR1-logo sill plates
* ZR1-logo headrest embroidery
* Specific gauge cluster with “ZR1” logo on the tachometer and a 220-mph (370 km/h) readout on the speedometer
* Boost gauge added to the instrument cluster and Head-Up Display

The standard ZR1 (RPO 1ZR) comes with accoutrements based on the Z06, including lightweight seats and lightweight content. The uplevel interior package (RPO 3ZR) includes power-adjustable, heated and leather-trimmed sport seats (embroidered with the ZR1 logo); side air bags; Bose premium audio system; navigation system; Bluetooth connectivity; power telescoping steering column; custom leather-wrapped interior available in four colors and more.

By the Numbers

In addition to the exterior cues and powertrain, ZR1 models will be distinguished from other Corvette models by their VIN. Each will carry a unique, identifying VIN digit, as well as a sequential build number. This makes it easy to determine the build number of a specific car – information treasured by enthusiasts and collectors. For example, a ZR1 with a VIN ending in “0150” would indicate it is the 150 th ZR1 built for the model year.

Chevrolet hasn’t revealed the price of its 2009 Corvette ZR1, but most of the technical details are being released less than a month before the supercar’s formal launch in mid-January at the 2008 Detroit Auto Show.

The numbers are staggering, to say the least: 620 horsepower and 595 pound-feet of torque from the all-new LS9 engine — a 6.2-liter version of the familiar Chevy small-block V8, fitted with an intercooled Roots-type supercharger from Eaton and mated to a new close-ratio six-speed manual gearbox with dual-disc clutch.

A low curb weight of 3,350 pounds gives the new ZR1 a better power-to-weight ratio than such high-priced, 12-cylinder Italian exotics as the Ferrari 599 GTB Fiorano and the Lamborghini Murciélago LP640. Chevy boss Ed Peper claims the ZR1 will be “the first production Corvette to achieve a top speed of at least 200 mph.”

Built on the same basic chassis as the Corvette Z06, the ZR1 gets standard magnetic selective ride control with track-level suspension and is capable of pulling better than 1g on the skid pad. The torque tube and half-shafts have been beefed up to handle the additional power, and Chevy has fitted carbon-ceramic brake rotors and larger calipers.

The ZR1 rides on Michelin Pilot Sport 2 tires — 285/30ZR-19s in front and 335/25ZR-20s in the rear — mounted on 20-spoke alloy rims painted in bright sterling silver. Chrome wheels are one of only two options on the car.

Chevy designers did a good job of providing the ZR1 with a distinctive exterior look, with loads of carbon fiber, including wide front fenders, a hood with a raised polycarbonate window (so you can see the intercooler below), roof, front-fascia splitter and rocker moldings. A full-width rear spoiler features raised outboard sections and is specific to the ZR1.

The cockpit is surprisingly low-key, considering the car’s target price of just under $100,000. There are a number of pieces from the Z06, accented with a specific ZR1 gauge cluster, including a 220-mph speedo and a boost gauge, plus logo sill plates and embroidered headrests.

In addition to the chrome wheels, the only other option when the car goes on sale next summer will be a luxury interior package, with power sport bucket seats, leather trim, navigation system and Bluetooth connectivity.

Chevy isn’t saying yet just how many ZR1s it will build, but does note that each car will carry a sequential build number and a special VIN that will identify it as a ZR1. As if anyone would have to look….

In anticipation of the ZR1’s introduction at the 2008 Detroit auto show in January, Chevrolet at last has opened the proverbial hood on this, the most powerful, most expensive and most highly anticipated Corvette in the model’s half-century history.

Stop, I Say
There should be no dispute about the effectiveness of the ZR1’s brakes. The rotors are as large as or larger than most wheels were just a decade ago.

In what must be a very sweet moment for a longtime Corvette engineer, Juechter notes that the monster 15-inch Brembo carbon-ceramic rotors fitted as standard to the ZR1’s rear wheels are the brakes originally designed for the front of Ferrari’s 650-hp Enzo supercar. In the front of the ZR1, you’ll find even larger 15.5-inch carbon-ceramic units.

Juechter says, “The only vehicle I know of that has these brakes as standard equipment is the 1,000-hp Bugatti Veyron.” Then he adds with a grin, “Although I think you can get them as a $20,000 option on the Ferrari 599.” We get the sense Juechter will be using these laugh lines many, many times in the near future.

The Price of Production
Chevrolet isn’t about to tell us the price it intends to charge for the 2009 Chevrolet Corvette ZR1. But it tells us that the prime motivator for the project has been GM honcho Rick Wagoner, who asked, “What would a $100,000 Corvette look like?” The ZR1 is apparently the answer and we expect the car’s list price will be near enough to the $100,000 mark.

Chevy says it is constrained by production of the carbon-fiber bits to only 2,000 ZR1s per year, and since it seems to us as if we’ve met almost as many Corvette nuts in our career with the funds to bid up the price significantly, we think the list price might be strictly academic in the first year’s production.

So that’s it. There’s no more mystery Corvette. We’ll have to just go ahead and go through the arduous task of driving the thing and testing it.

Shortly thereafter we’ll begin speculating on the C7 Corvette and the circle of life will continue.