Obviously Clarkson grabbed the ZR1, Hammond got the keys to the CTS-V, and of course James May gets the outgunned Challenger SRT8. Pending the results of the show, we're assuming the ZR1 and CTS-V will be getting their just due on the world stage, while May will probably end up with the Challenger doing donuts and catching on fire. We have no idea when this episode will be hitting the airwaves, but when we find out it'll be pinned to our calenders. We eagerly await the metaphoric gymnastics Clarkson will be performing on the ZR1. Wonder how the Top Gear America guys feel about the British crew stealing their product thunder? (Hat tip to Paul!) [FinalGear]

[via autoblog.nl]

Photography: Alex Conley

The "Jake" logo originally born of the Corvette C5R racing program has been officially nixed from all ZR1 activities. That doesn't mean the GM Design Studio couldn't work up a new, unofficial logo to act as the mascot for the ZR1. The little blue devil skull borrows elements of the Jake logo, but also hearkens back to the originally rumored name of the car, the Blue Devil, an homage to Rick Wagoner's Duke Alma Mater. Anyone else think these should come standard on the car? Because we think this whole idea is both totally awesome and damn funny.

Remember to come back Wednesday the 20th of August for our first impressions of GM's Corvette ZR1, where Wes tests the limits of his sanity, and his pampers.

Photo Credit: Alex C. Conley

But Dan, the caller, isn't exactly some penniless chump dreaming beyond his means: He's got $150k just chillin' in his savings account. Now, we know the ZR1 starts at $103,300, but Dan was figuring on spending $120,000. Of course, Orman apparently doesn't understand just how special the ZR1 is, claiming that its value will drop like a brick as soon as it pulls off the dealer lot. We're not so sure, what with the first car being auctioned off for a cool $1,000,000. Not to mention, if Dan can actually find a ZR1 for $120k, with all the inevitable dealer mark-ups, he'll be getting quite the bargain. [via CorvetteBlogger]

Jalopnik Snap Judgment: Dave Ressler, the new owner of the first 2009 ZR1 — the rights to which were sold at Barrett-Jackson, with proceeds going to charity — also happens to be the owner of the oldest known Corvette, a 1953 model. So what does Ressler do for a living? Why, he's a Chevy dealer, of course, and the owner of a large 'Vette collection in North Dakota. Ressler hasn't announced his plans for the new car, which has unique blue paint and a special VIN, but we hope he doesn't squirrel it away in his barn. North Dakota farm roads and ZR1s seem made for each other. [via VetteTube]

[General Motors]

..."there's a whole lot of mess going on there in the grille area," and another let us know clearly "I hate it." But we don't care. We think it's beautiful and we want to take it home and pet it all day and dress it up in baby clothes and...yeah. That may have gone too far. Oh well, it's hot. [Serious Wheels via World Car Fans]

The GTR is the natural progression of Specter Werkes existing product line, which was previously topped out with the Group 6 model. When we first saw the new GTR, the car had just finished primary sculpting, meaning one half of the car had been carved out of clay and the full design was given the green light. As might be expected, half a custom car would only raise the ire of enthusiasts, so duplicating the work for the other side was the order of the day when we visited. The working buck was raised on static stands underneath a 4-axis CNC machine designed to scan one side of the car and duplicate it on the other. This is the kind of stuff the big boys do — so there'd be no corners cut here. The CNC tech has the job of fiddling with the the surface model program, setting it to execute, and then making sure the machine doesn't gouge a huge hole out in the progress. It's calm and quiet work requiring an eye for detail, and the ability to tweak software when needed. Normally it's not.

The car emerging from that massive hunk of clay is looking pretty sick. We've heard complaints about the C6 Corvette that despite lacking the giant-rear-end syndrome of its predesessor, it's without a certain je ne sais quoi in the aggressiveness department. The Specter Werkes GTR certainly gets rid of any of those complaints. The crazy aggressively angular body work will be complimented by exclusive Michelin PS2 Zero Pressure tires as wide as your arm is long, at 335/25R20 mounted to 20x12.5" Forgeline wheels in the back and 285/30R19 on 19x10 wheels up front. In case you weren't paying attention right there, that's a crap load of rubber. Carbon fiber bits and pieces will be scattered around in such components as the diffusers and the headlights. We were impressed to find out Specter is working directly with the Tier 1 supplier, Visteon, on getting those headlights directly from the source. These won't be crap aftermarket products.

We're eager to see the GTR #1 at its unveiling next month and we're pretty sure Rollie Purifoy Chevrolet in Lupton, Colorado is excited as well, considering their name is on the papers for that first car off the line. One of these days we might get out to the track to see just what these things will do. Fear not, we'll bring you along for the ride. [Spektor Werks]

2009 Corvette ZR1 Powered By The Most Powerful Production Engine Ever From GM: The Supercharged LS9 Small-Block V-8

PONTIAC, Mich. - When it arrives next summer, the 2009 Chevrolet Corvette ZR1 will be the most powerful and fastest production car ever produced by General Motors, with performance enabled by a new, supercharged 6.2L LS9 small-block V-8 engine.

Incorporating the engineering experience already found in the Corvette Z06's LS7 engine and the new-for-2008 6.2L LS3 of the Corvette, GM Powertain is targeting 100 horsepower per liter for the LS9, or 620 horsepower (462 kW), and approximately 595 lb.-ft. of torque (807 Nm); final SAE-certified power levels will be available in early March 2008.

It is, indeed, the ultimate small-block engine for the ultimate Corvette.

"When you experience the LS9 in the Corvette ZR1, the terms performance and refinement take on a new meaning," said Tom Stephens, group vice president for GM Powertrain and Quality. "The LS9 demonstrates an outstanding performance range, with smooth driveability at low speeds, and surprisingly fierce performance when the customer wants more power."

The enabler of the LS9's performance is a new, large positive-displacement Roots-type supercharger - with a unique four-lobe design - developed for the engine by Eaton. It is teamed with an integrated charge cooling system that reduces inlet air temperature for maximum performance. The LS9 represents the first of several new, supercharged small-block engines that will be introduced in GM vehicles in the near future, each using superchargers of similar design.

"The small-block V-8 once again demonstrates it boundless horsepower potential, versatile design and an architecture with proven quality, durability and reliability," said Stephens. "We haven't yet realized the small-block's performance potential."

Performance range

More than just its tremendous peak horsepower and torque numbers, the supercharged LS9 makes big power at lower rpm and carries it in a wide arc to 6,600 rpm. GM Powertrain testing shows the engine makes approximately 300 horsepower (224 kW) at 3,000 rpm and nearly 320 lb.-ft. of torque (434 Nm) at only 1,000 rpm. Torque tops 585 lb.-ft. (793 Nm) at about the 4,000-rpm mark, while horsepower peaks at 6,500 rpm. The engine produces 90 percent of peak torque from 2,600 rpm to 6,000 rpm.

Heavy-duty and lightweight reciprocating components enable the engine's confident high-rpm performance, while the large-displacement Eaton supercharger pushes enough air to help the engine maintain power through the upper levels of the rpm band.

"The sixth-generation design of the supercharger expands the 'sweet zone' of the compressor's effectiveness, broadening it to help make power lower in the rpm band," said Ron Meegan, assistant chief engineer. "To put it simply, the low-end torque is amazing."

The LS9 is assembled by hand at GM's Performance Build Center, a unique, small-volume engine production facility in Wixom, Mich., that also builds the Corvette Z06's LS7 engine and other high-performance GM production engines.

Cylinder block and reciprocating assembly details

The LS9's aluminum cylinder block features steel, six-bolt main bearing caps, with enlarged vent windows in the second and third bulkheads for enhanced bay to bay breathing. Cast iron cylinder liners - measuring 4.06 inches (103.25 mm) in bore diameter - are inserted in the aluminum block and they 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.

Nestled inside the cylinder block is a forged steel crankshaft that delivers the LS9's 3.62-inch (92 mm) stroke. It features a smaller-diameter ignition-triggering reluctor wheel and a nine-bolt flange - the outer face of the crankshaft on which the flywheel is mounted - that provides more clamping strength. Other non-supercharged 6.2L engines, such as the base Corvette's LS3, have a six-bolt flange. A torsional damper mounted to the front of the crankshaft features a keyway and friction washer, which also is designed to support the engine's high loads.

Attached to the crankshaft is a set of titanium connecting rods and forged aluminum pistons, which, when combined with the cylinder heads, delivers a 9.1:1 compression ratio. This combination is extremely durable and lightweight, enabling the LS9's high-rpm capability.

Cylinder head details

The basic cylinder head design of the LS9 is similar to the L92-type head found on the LS3 V-8, but it is cast with a premium A356T6 alloy that is better at handling the heat generated by the supercharged engine - particularly in the bridge area of the cylinder head, between the intake and exhaust valves.

In addition to the special aluminum alloy, each head is created with a rotocast method. Also known as spin casting, the process involves pouring the molten alloy into a rotating mold. This makes for more even distribution of the material and virtually eliminates porosity - air bubbles or pockets trapped in the casting - for a stronger finished product.

Although the heads are based on the L92 design, they feature swirl-inducing wings that are cast into the intake ports. This improves the mixture motion of the pressurized air/fuel charge. The charge enters the combustion chambers via titanium intake valves that measure 2.16 inches (55 mm) in diameter. Spent gases exit the chambers through 1.59-inch (40.4 mm) hollow stem sodium-filled exhaust valves. The titanium intake and sodium-filled exhaust valves are used for their lightweight and high-rpm capability.

To ensure sealing of the pressurized engine, unique, four-layer steel head gaskets are used with the LS9's heads.

Camshaft and valvetrain

The broad power band enabled by the LS9's large-displacement supercharger allows it to make strong low-end torque and great high-rpm horsepower, which allowed engineers to specify a camshaft with a relatively low lift of 0.555-inch (14.1 mm) for both the intake and exhaust valves. This low-overlap cam has lower lift and slower valve-closing speeds than the Z06's 505-horsepower (377 kW) LS7, helping the LS9 - with its approximately 620 horsepower - deliver exemplary idle and low-speed driving qualities.

The camshaft actuates a valvetrain that includes many components, including the lifters, rocker arms and valve springs, of the LS3 engine. However, LS7 retainers are used to support the engine's high-rpm performance.

Supercharger and charge cooler details

The LS9's R2300 supercharger is a sixth-generation design from Eaton, with a case that is specific to the Corvette application. The supercharger features a new four-lobe rotor design that promotes quieter and more efficient performance, while its large, 2.3-liter displacement ensures adequate air volume at high rpm to support the engine's high-horsepower aspiration. Maximum boost pressure is 10.5 psi (0.72 bar).

The supercharger is an engine-driven air pump that contains a pair of long rotors that are twisted somewhat like pretzel sticks. As they spin around each other, incoming air is squeezed between the rotors and pushed under pressure into the engine - forcing more air into the engine than it could draw under "natural" aspiration. The rotors are driven by a pulley and belt that are connected to the engine's accessory drive system.

Because the pressurized air is hotter than naturally aspirated air, the LS9 employs a liquid-to-air charge cooling system to reduce inlet air temperature after it exits the supercharger - reducing the inlet air temperature by up to 60 degrees C (140 F). Cooler air is denser and allows the engine to make the most of its high-pressure air charge. The charge cooling system includes a dedicated coolant circuit with a remote-mounted pump and reservoir.

The design of the supercharger case and its integrated charge cooling system was driven by the space and dimensions afforded under the Corvette's hood. To that end, the charge cooler was designed as a "dual brick" system, with a pair of low-profile heat exchangers mounted longitudinally on either side of the supercharger. Coupled with the supercharger itself, this integrated design mounts to the engine in place of a conventional intake manifold and is only slightly taller than a non-supercharged 6.2L engine. The air inlet and rotor drive pulley are positioned at the front of the supercharger.

Additional engine details

Oiling system: The LS9 uses a dry-sump oiling system that is similar in design to the LS7's system, but features a higher-capacity pump to ensure adequate oil pressure at the higher cornering loads the ZR1 is capable of achieving. An oil-pan mounted oil cooler is integrated, too, along with piston-cooling oil squirters located in the cylinder block. The expanded performance envelope of the Corvette ZR1 required changes to the dry sump system also used in the Z06. System capacity is increased and scavenge performance improved to meet the demands of Chevrolet's highest-performance sportscar.

Water pump: To compensate for the heavier load generated by the supercharger drive system, an LS9-specific water pump with increased bearing capacity is used.

Accessory drive system: In order to package the accessory drive system in the Corvette's engine compartment, the supercharger drive was integrated into the main drive system. This required a wider 11-rib accessory drive system to be used with the LS9 in order to support the load delivered by the supercharger.

Fuel system: The LS9 uses high-capacity 48-lb./hr. fuel injectors with center-feed fuel lines. The center feed system ensures even fuel flow between the cylinders with less noise. In order to ensure fuel system performance during low speed operation as well as under the extreme performance requirements of wide open throttle (WOT), a dual pressure fuel system was developed. This system operates at 250 kPa at idle and low speed, and ratchets up to 600 kPa at higher-speed and WOT conditions.

Throttle body: An 87-mm, single-bore throttle body is used to draw air into the engine. It is electronically controlled.

Rocker covers / ignition coils: Unique rocker covers with new, direct-mount ignition coils are used. Other Gen IV engines, such as the LS3, feature coil packs mounted to a bracket. The LS9's direct-mounted coils offer a cleaner appearance and a shorter lead between the coil and spark plug.

Beauty cover: A special engine cover is attached to the top of the LS9. It surrounds the intercooler, which is visible through a hood window, accenting the supercharger while simultaneously reducing noise. The cover has "LS9 SUPERCHARGED" script on the left and right sides, along with a debossed Corvette crossed flags emblem on the front.

New six-speed manual transmission

The Corvette ZR1's LS9 engine is backed by a Tremec TR6060 six-speed manual transmission, with a twin-disc clutch system. It is based on the proven T56 six-speed, but upgraded to handle the LS9's torque output and delivers improved shift quality

The twin-disc clutch system provides exceptional clamping power, while maintaining an easy clutch effort. The system employs a pair of 260-mm discs, which spreads out the engine's torque load over a wider area, enabling tremendous clamping power to channel the LS9's torque. It also dissipates heat better and extends the clutch life (in normal driving).

Thanks to comparatively small plates, the twin-disc system enables similar disc inertia to the Corvette Z06, which has a 290-mm single-disc system, contributing to low shift effort and providing exceptionally smooth engagement and light pedal effort. In fact, the more powerful ZR1 has a pedal effort similar to the Z06.

ZR1-specific gearing in the transmission provides a steep first-gear ratio that helps launch the car. The car's 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. The gears also are designed to balance performance with refinement. The angles of the gear teeth are optimized to provide both strength and quietness.