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LS-3 GM official Info and 2008 Corvette press release

Discuss the 5th gen (Will there be?), spy photo's, rumors, etc

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ins0mnia24
Posted: Mon Apr 30, 2007 2:27 pm
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Here is the official Corvette press release which goes into great detail about the LS-3 Considering it will probably end up in the 5th Gen..
The Hp ratings are pretty disappointing considering they increased the cubes and only have 436hp 428ft lbs torque to show for it...

I sure hope for Gm's sake that they kept the weight down on the 5th gen to the rumored 3500lbs if not it looks like the Dodge Challenger might prove to be a greater Opponent ...

The 6 speed automatic paddle shifter is interesting though.. :lol:


HERE IS THE PRESS RELEASE FROM GM;
2008 Corvette: Iconic Sports Car Recieves Larger, More Powerful LS3 6.2L V-8 And Host Of Driving, Interior Refinements
Chevrolet Corvette & Corvette Z06...
430 hp (321 kW)*
424 lb.-ft. of torque (575 Nm)*
436 hp / 428 lb.-ft. (325 kW / 580 Nm)* with new, optional dual-mode exhaust system
High-flow cylinder heads
Enhanced valvetrain
High-flow intake manifold
Larger-bore block with structural enhancements
Improved manual transmission shift effort
Quicker shift times on paddle-shift six-speed automatic
2.73 performance axle ratio available with six-speed paddle shift; included with Z51 package
Improved steering feel ………

Standard split-spoke cast aluminum wheel design for Coupe and Convertible (Competition Gray finish optional)
Available polished forged aluminum wheel design
New Keyless Access remote key fob with integrated key
Interior trim enhancements for all models, including wrapped center trim plate with Cyber pattern and new, brushed aluminum accents
Custom Leather-Wrapped Interior Package available for all models in exclusive, new Linen and Sienna colors
New sill plates
iPod/MP3 jack included on all sound systems except navigation (Personal Audio Link available as accessory for navigation system)
OnStar and XM Satellite Radio standard on all models Auto-dimming mirrors with compass standard on all models
Two new premium exterior colors: Jetstream Blue Metallic Tintcoat and Crystal Red Metallic Tintcoat

2008 CORVETTE: ICONIC SPORTS CAR RECIEVES LARGER, MORE POWERFUL LS3 6.2L V-8 AND HOST OF DRIVING, INTERIOR REFINEMENTS


Get comfortable. There’s so much new and exciting with the 2008 Corvette that you’ll want to grab a sadle up to your computer screen and absorb all the details. The changes involve everything from an all-new, larger and more powerful V-8 engine to refinements in driving characteristics that solidify the Corvette’s position as the preeminent American sports car – and further the argument that it is one of the world’s best. There are also a host of exterior and interior refinements that raise the Corvette’s luxury status and enhance the feeling of craftsmanship.


“Corvette is an uncompromising sports car that rewards its owners with impeccable performance and great comfort,” said Ed Peper, Chevrolet general manager. “The changes and enhancements to the 2008 Corvette reflect continual improvements that speak to Chevrolet’s unflagging commitment to building the best sports car – and with nearly 55 years of experience, the Corvette just keeps getting better and better.”

Also back again for ‘08 is the 505-horsepower Corvette Z06, an American super car that has won over enthusiasts, journalists and racers around the world for its balance of racetrack-bred performance, daily-driving civility and value.

Here’s a look at the new and enhanced features for ‘08 Corvette models:

Engine – A new, 6.2L LS3 small-block V-8 is the standard engine in Coupe and Convertible models. It is rated at 430 horsepower (321 kW)* and 424 lb.-ft. of torque (586 Nm)* with the standard exhaust system; with the new, optional two-mode exhaust system, power ratings increase to 436 horses / 325 kW and 428 lb.-ft. / 592 Nm. As a result, the standard Corvette is true supercar, capable of 190 mph. The LS3 with the six-speed paddle-shift automatic is the fastest automatic-equipped Corvette ever, with 0-60 mph capability of 4.3 seconds.

This new iteration of the storied small-block family features a revised, larger-bore cylinder block – 4.06-inch / 103.25 mm vs. the previous 6.0L’s 4.00-inch / 101.62 mm bores – high-flow, LS7/L92-style cylinder heads; larger-diameter pistons; revised camshaft and camshaft timing; revised valvetrain with offset intake rocker arms; high-flow intake manifold; high-flow fuel injectors from the Z06’s LS7 engine; and a new engine beauty cover.

The LS3 features an aluminum cylinder block with cast iron cylinder liners. In addition to its larger bores, which help create a 376-cubic-inch displacement, the block casting also features revisions and machining in the bulkheads that enhance its strength and improved bay to bay breathing. But while the bore of the 6.2L engine is increased when compared with the previous 6.0L engine, the engine’s stroke remains at 3.62 inches (92 mm). The pistons for the larger 6.2L engine also are new and are designed for its high-rpm performance capability.

Breathing for the new 6.2L engine is accomplished via new, high-flow cylinder heads. They’re based on the large port/large valve design found on the LS7 engine and other GM L92 engines, with larger-capacity, straighter intake ports. The design optimizes intake flow to the combustion chamber and the exhaust ports are also designed for better flow.

Complementing the larger-port design of the heads are commensurately sized valves. The intake valve size alone increases from 2.00 inches (50.8 mm) to 2.16 inches (55 mm) – an increase of nearly 9 percent. The intake valves feature lightweight hollow stems, which enable the engine’s 6,600-rpm capability. The exhaust valves also are large, measuring 1.60 inches (40.4 mm) in diameter.

To accommodate the engine’s large valves and enable more direct intake port flow, the intake-side rocker arms are offset 6 mm between the valve tip and the push rod. Actuating the valves is a new camshaft, with intake-side lobes providing more than a 5-percent percent in increase in lift, from 0.521-inch to 0.551-inch (13.25 mm to 14 mm). Exhaust-valve lift remains unchanged from the LS2. The camshaft timing was revised to optimize performance with the higher-lift intake cam profile.

Ensuring the cylinder heads receive all the air they can handles falls to a new, acoustically tuned intake manifold. The composite design is manufactured with a “lost core” process that improves runner to runner variation and reduces airflow losses. An acoustic foam material is used to reduce radiated engine noise; it is sandwiched between the outer top of the manifold and an additional “skull cap” acoustic shell. Also new beauty covers atop the engine shield the rocker covers and also feature a noise-reducing, acoustically tuned insert to provide a more refined engine sound.

Exhaust system – Optional on ‘08 Coupe and Convertible models is a new, two-mode performance exhaust system. Similar in design and function to the system used on the Z06, the dual-mode exhaust uses vacuum-actuated outlet valves, which control engine noise during low-load operation, but open for maximum performance during high-load operation. It is not identical to the Z06 system; the Coupe/Convertible uses a 2.5-inch-diameter exhaust, while the Z06 uses a three-inch system.

With the new, dual-mode performance exhaust, power output for Coupe/Convertible rises from 430 horsepower (321 kW) and 424 lb.-ft. of torque (575 Nm) to 436 horses (325 kW) and 428 lb.-ft. (580 Nm). This system gives the Corvette a more aggressive exhaust sound character that will appeal to performance enthusiasts.

Transmissions and axle ratios – The shifting efforts for both the six-speed manual transmission and paddle-shift six-speed automatic transmissions have been improved in ‘08 Corvette models. The manual transmission shifting improvements include a more positive and direct feel during gear changes, with better gate-to-gate location.

The six-speed paddle-shift automatic transmission on Coupe and Convertible is improved with new hardware and a new controller calibration that deliver quicker shifts. This change bolsters the feeling of performance and driver control when using the shifting paddles.

Also new for ‘08 models is the availability of the 2.73 performance axle ratio with the automatic transmission. It is included with the Z51 package

Steering system – The Corvette’s precise rack-and-pinion steering system is revised to provide improved feel at all speeds. The revisions are due to a new, premium machining process of the system’s internal components, a new, stiffer intermediate shaft and controller calibration changes.
Wheels – Corvette Coupe and Convertible models come with a new split-spoke wheel design for ‘08. The design was introduced on the limited-edition ‘07 Indianapolis 500 Pace Car replicas with a Sterling Silver finish. The standard 18-inch front wheels and 19-inch rear wheels feature a Sparkle Silver finish, with a Competition Gray version optional.

Also new is a distinctive, performance-oriented forged aluminum wheel for Coupe and Convertible. It comes in a polished finish.

Exterior colors – There are two new premium exterior colors available with 2008 Corvette models: Jetstream Blue Metallic Tintcoat and Crystal Red Metallic Tintcoat; they replace Le Mans Blue Metallic and Monterey Red Metallic Tintcoat.

Custom Leather-Wrapped Interior Package – Available on Coupe, Convertible and Z06 models, the new Custom Leather-Wrapped Interior Package offers a stylish, two-tone leather-appointed cabin with details that enhance the feeling of Corvette’s craftsmanship. Details include:

Two-tone, leather-wrapped upper and lower instrument panel, door pads and seats
Choice of new, exclusive colors: Linen or Sienna, with unique color breakup
Padded door panel armrests
“Corvette” embroidered on passenger-side dash pad
Embroidered crossed flags logo on headrests
Unique center trim plate with Bias pattern.
Interior enhancements – All models feature a new wrapped instrument panel center trim plate, with bright surrounds for the shifter and cupholder. There are also new metal-finish door sill plates that greet passengers as they step into the vehicle, as well as a new lighted control knob for the available Magnetic Selective Ride Control.

Feature changes and enhancements – All Corvette models now come standard with features that were previously optional or part of equipment packages. They include:

OnStar with available Turn-By-Turn Navigation
XM Satellite Radio
Auto-dimming rearview mirrors (with compass)
Audio input jack on all radio systems except navigation; Personal Audio Link is available as a dealer-installed item with the navigation system.
The ‘08 Corvettes also come with a new Keyless Access fob, which features the key and remote-function controls integrated in a single unit.

Corvette design and interior details

Dramatic fender forms and exposed headlamps combine with the grille to create a strong visual identity for the Corvette, while the tapered rear deck and fascia improve high-speed performance. The lean rear design sports round taillamps and center-exit exhaust. The fixed Xenon high-intensity discharge headlamps provide superior lighting performance. With a 0.286 coefficient of drag, the Coupe models are the most aerodynamic Corvettes ever. The 2008 Corvette Convertible features a power-operated soft top with the 3LT package; an easy-to-operate manual top is standard. Both configurations use a five-layer fabric that conceals the underlying structure for a good top-up appearance, plus it helps preserve the car’s excellent aerodynamics and reduces road noise.

Corvette’s interior is inspired by the car’s dual-cockpit heritage. High-quality materials, craftsmanship and functionality help deliver premium quality meant to enhance performance driving. The instrument panel and doors are covered with cast-skin foam-in-place trim that looks like a leather-wrapped, padded panel. It is warm and inviting and has double the life of conventional trim materials.

An AM/FM/XM radio with CD player and audio input jack is standard. An optional Bose audio system with an in-dash six-disc changer adds to the choices available to the audiophile owner. Steering-wheel mounted audio controls – introduced in ‘07 – are included with the Bose premium system.

A full-function OnStar system is standard and an onboard navigation system with voice recognition is available. Using a 6.5-inch (165 mm) color touch-screen display, the DVD-based system contains all the map data for the 48 contiguous states and most of Canada on one disc.
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roughskinjrz
Posted: Mon Apr 30, 2007 2:31 pm
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id still get one if i could...
'74 454 .030 Over 4.250 Stroke 489, SRP Forged 0.030 Flat Tops, Crane Z Blower .632/.632 244/256 Cam, Weiand 871 Roots Blower, 2 x 800cfm Barry Grant Speed Demon Carb, Procomp 320cc Heads Race Package, CSR Electric Water Pump, TH400 FUll Manual Reverse Valve Body Sportsman Trans Brake 3000 Stall, 9" Rearend 31 Spline 3.70 Gears.
 

 
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ins0mnia24
Posted: Mon Apr 30, 2007 2:39 pm
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4:10 gears on a 6 speed automatic with a paddle shifter is the only thing that sounds appealing to me rightnow..
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TheCactusWill
Posted: Mon Apr 30, 2007 3:29 pm
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You're right, I'm sure they could squeeze more power out of it. The LS7 is still making more hp per displacement than this LS3 when the LS3 is a newer engine. But its also possible the ratings on the LS3 are conservative, maybe its easier to squeeze more power out of with upgrades...

As far as sales are concerned tho, I think they're doing the right thing. They're not going to repeat the mistake of the ZR1, the car cost twice as much as the base model but was only marginally faster...

So if they offered a base engine closer to the 505hp LS7, and you could buy that for 50k instead of 80, everyone would just buy the base model and the upgraded model sales would suffer...
 


 

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