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C6 Corvette

The 6.2L LS9 V8: Heart of the 2009 Corvette ZR1

by Keith Cornett on December 20, 2007

The 2009 LS9 6.2L V8 will power the new Corvette ZR1

The small block V8 is one of the most enduring engines ever produced and time and again, the engineers at GM have found ways to push performance and efficiency to new levels. So its only fitting that with the flood of information that’s been released about the upcoming 2009 Chevrolet Corvette ZR1, we take a few minutes to stare in awe of what is essentially the heart of the new King of the Hill, the all-new LS9.

While the Corvette Z06 gets is power from the raw displacement of the 7.0L LS7, engineers took a step back by bringing the engine size back down to 6.2 liters and then boosted the power with a Eaton designed roots-type supercharger. Creating more power at lower RPM’s is the signature of the LS9. At 3,000 RPM’s the engine makes approximately 300 horsepower. GM has targeted 100 horsepower per liter, or 620 total horsepower and 595 pounds of torque. The SAE certified figures will be available in March 2008.

Press Release

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 Powertrain 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: 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. The intercooler has the legend “LS9 SUPERCHARGED” embossed on the left and right sides, and the engine beauty cover features the Corvette crossed flags logo debossed at 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 new-for-2008 TR6060 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.


Sources:
National Corvette Museum

Related:
The New King of the Hill: The 2009 Corvette ZR1
2009 Corvette ZR1 Image Gallery
Corvette ZR1 News Archive

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November 2008 Corvette Sales; 2008 Corvette Price Increase

by Keith Cornett on December 7, 2007

General Motors released the Corvette sales figures for November 2008. Production over the last couple of months has averaged around 2,450 which is about 300 units less than 2006. Total calendar sales (January through November) just broke the 3,000 mark at 30,771. Production in 2007 continues to lag last year’s production by 8%.

Month Calendar Year-to-Date
Month 2007 2006 % Change Months 2007 2006 % Change
January 2,234 2,579 -16.8% Jan-Jan 2,234 2,579 -16.8%
February 2,784 3,058 -9.0% Jan-Feb 5,018 5,637 -11.0%
March 3,158 3,655 -16.7% Jan-Mar 8,176 9,292 -12.0%
April 3,227 3,516 -0.6% Jan-Apr 11,403 12,808 -11.0%
May 3,300 3,317 -4.3% Jan-May 14,703 16,125 -8.8%
June 3,055 2,938 0.1% Jan-Jun 17,758 19,063 -6.8%
July 2,377 2,794 -11.4% Jan-Jul 20,135 21,857 -7.9%
August 2,877 2,990 -3.8% Jan-Aug 23,012 24,842 -7.4%
September 2,837 3,056 -3.5% Jan-Sept 25,849 27,903 -7.4%
October 2,484 2,761 -13.5% Jan-Oct 28,333 30,664 -7.6%
November 2,438 2,773 -12.1% Jan-Nov 30,771 33,437 -8.0%
On a related note, both Corvette Conti and the Corvette Blog have reported a slight increase in 2008 Corvette prices. Coupes and Convertibles are going up by $115 bringing the prices to $46,225 and $54,565 respectively. A destination charge of $825 is included in these figures.
Source:
General Motors Related:
October 2008 Corvette Sales
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Corvette Makes Car & Driver’s 2008 10 Best Cars List

by Keith Cornett on December 4, 2007

The 2008 Chevrolet Corvette ConvertibleIf it seems like Corvette is always making Car and Driver’s annual 10 Best Cars List, that’s because it has earned a spot on the coveted list for seven years straight. Calling the Corvette a poster car for continual development, the new 2008 Corvette boasts 22 significant updates over last year’s entry. Car and Driver’s staff focuses more on the improvements they say are dynamic to the driving experience. While they liked the upgrades to interior, especially the wrap-around leather option, it’s the upgrades to the steering, manual shifter and the clutch that won them over for the seventh straight year. Oh and let’s not forget the fact that Corvette’s mid-cycle upgrade included the new 6.2 liter LS3 engine that expands the horsepower envelope from 400 to 430. Everyone loves more ponies and the 2008 Corvette delivers. Car and Driver calls the Corvette one of the world’s best high performance buys. Here is the full list of cars that made Car and Driver’s 10 Best List for 2008: BMW 3- Series
Cadillac CTS
Chevrolet Corvette
Chevrolet Malibu
Honda Accord
Honda Fit
Mazda MX-5
Mazdaspeed 3
Porsche Boxter/Cayman
Volkswagen GTI
Source:
Car and Driver Related:
Kelley Blue Book Includes 2008 Corvette Z06 in Top 10 Resale List
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Corvette Z06 Chosen to Pace 50th Daytona 500 in 2008

by Keith Cornett on November 19, 2007

The 2008 Corvette Z06 Daytona 500 Pace CarThe Daytona 500 is arguably the most prestigious race on NASCAR’s seemingly endless yearly racing schedule and for the last four years, Corvette has led the pack of race cars as the Official Pace Car. 2007 Daytona 500 winner Kevin Harvick, flanked by representatives of the Daytona International Speedway and General Motors, made a surprise appearance at last week’s Central Florida International New Car Show in Orlando, Florida to announce that Corvette would be back for the fifth consecutive year as Pace Car for the 2008 Daytona 500. Next year’s race will be even more special as 2008 marks the 50th anniversary of the Daytona 500. The 2008 Corvette Z06 Pace Car pays tribute to Daytona’s golden anniversary by being decked out in a stunning “Anniversary Gold” exterior paint with Red, White and Blue racing stripes. Like previous years, the Daytona 500 logo adorns the doors while the Chevrolet bowtie graces the hood in red. The current top-of-the-line Corvette is ideally suited for the pace car duties at Daytona. The Corvette Z06, with 505 horsepower, has more horsepower than the NASCAR sprint cup race cars it will pace. Other than the integrated light bar and strobe system, the Corvette Z06 Pace Car is nearly identical to the street version.

“Chevrolet has been inextricably linked to NASCAR from its inception and we are honored to support the golden anniversary of the sport’s premier race – the Daytona 500 – with a very special Corvette Z06 Pace Car,” said Ed Peper, Chevrolet general manager. “The Corvette Z06 has established a tradition in leading the pack at Daytona, which reflects Chevrolet’s commitment to racing and the fans.” “Talk about a ‘wow-factor,’” said Speedway President Robin Braig. “It’s the perfect piece of machinery to help pace a star-studded field at ‘The World Center of Racing’ for the historic 50th running of the Daytona 500.”
The 50th Anniversary running of the Daytona 500 will be held Sunday February 17, 2008.
Source:
Daytona International Speedway Related:
Video: 2007 Daytona 500 Z06 Corvette Makes TV Appearance
Corvette to Pace 2007 Daytona 500 Technorati Tags:
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The 2008 Corvette Z06Kelly Blue Book has released their list of 2008 model year vehicles with the best resale value and Corvette was front and center. What’s interesting about this year’s list is the inclusion of the Corvette Z06 in the newly created High Performance category. Last year’s survey omitted that category, but still said this about the 2007 Corvette Z06:

Kelley Blue Book’s Best Resale Value Awards exclude expensive, high-performance, low-volume vehicles, because of the program’s emphasis on serving the typical consumer. The No. 1 vehicle would have been the 2007 Corvette ZO6, holding the greatest percentage of its original value after a five-year ownership period.
This is what Kelley Blue Book says about the 2008 Corvette Z06 in this year’s survey:
Replace the standard Corvette’s 430-horsepower V8 with a 505-horsepower V8—an engine hand-assembled by a single technician—and you’ve got what many consider the best of the best in American sports cars. The added power is managed by a reworked suspension that delivers improved handling with very little sacrifice in highway ride comfort.
In addition to the Corvette Z06 holding the best resale title in the High Performance Category, Chevrolet’s Corvette also got the nod in the top 10 list for 2008 vehicles with the Best Resale Value.
Source:
Kelley Blue Book Related:
KBB (Unofficially) Names Z06 Corvette Best Resale Value Technorati Tags:
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ZR-What? Corvette C6RS coming April 2008

by Keith Cornett on November 5, 2007

Pratt & Miller's Corvette C6RSPratt & Miller wants you to forget all about the ZR-1, the 650 hp supercharged Uber-Vette due sometime next year. The big hype over the last view days has been reverberating from SEMA with the revelation that the famed race car builders will be producing an ultra limited number of Corvette C6RS, the 8.2 liter E85 powered Corvette with an exterior inspired by Corvette Racing’s C6.Rs. Only 25 Corvette C6RS are planned with deliveries beginning April 2008, however the entry fee into this unique club is stiff: $185,000 plus a C6 donor car. The Corvette C6RS is unique in so many ways and the E85 angle must drive environmentalists crazy. Yet, for the cost of two new ZR-1 Corvettes, is the Corvette C6RS worth the price? As someone pointed out. You’re essentially buying into the association with Pratt & Miller more than the car itself so if you can pony up the $200 large for an ultra cool C6RS, make sure you do it right by providing a velocity yellow donar car and then slapping a number #4 (or #64) on its side and painting Jake on the B-Piller when its complete. With Chevrolet offering what will essentially by four models next year: coupe, convertible, Z06 and ZR1, the tuners in the Corvette enthusiast market will need to push their designs to a new level if they want to succeed in their niche. Despite the costs of ownership, Pratt & Miller has created a winner with its 600 horsepower E85 powerplant and race-inspired carbon fiber panels.
Source:
PrattMillerC6RS.com Related:
Video: Jay Leno’s E85 C6RS Corvette Reveal
Green Gets Mean: The Skinny on Jay Leno’s E85 Corvette C6RS Technorati Tags:
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LeftLaneNews Details GM’s LS Engine Plans

by Keith Cornett on October 31, 2007

Leftlanenews.com did a query of their sources at GM to provide a detailed look of future plans for GM’s LS engines. For our purposes, we’ll cover the three that have implications for Corvette: The LS7, LS8 and LS9. The LS7
The LS7 is a naturally aspirated 7.0 liter motor and is the current top of the line performance engine for GM, appearing exclusively in the Corvette Z06. It is hand built at GM’s Wixom Performance Center, and therefore very expensive to make. The LS7′s days are numbered according to Leftlanenews sources, ceasing production sometime during late 2009 or mid-2010. Previous rumors of the Cadillac CTS-V getting the LS7 appear to be false. Instead, the performance Cadillac sedan will get the new LSA motor next year with the Corvette Z06 upgrading to the supercharged small block LS8 in 2010. The LS8
The LS8 is a 6.2 liter smallblock V8 with a supercharger. This motor will be dropped into the top-end Zeta platform cars with the Camaro Z28 being the most likely candidate. Initial specs have it at 475-500 horsepower with a choice of manual or automatic transmissions. As mentioned above, the Corvette Z06 will receive this power plant in 2010 with a possibility of an uptuned version to ensure Corvette’s horsepower superiority over the Zeta cars. The last thing a Corvette owner who plunks down $75K for a Z06 is going to want to hear is that they bought the Corvette with the Camaro engine. The LS9
So much has already been written about the LS9 that is seems like it’s already in production and out on the streets. Another 6.2 liter smallblock V8 with a supercharger, it has an integrated intercooler on the intake manifold. Estimated horsepower is speculated to be 650 hp with 700 hp in reach. The ZR-1 may also feature an optional automatic with paddle shifters. Earlier this year it was said that the LS9 would come only equipped as an automatic, but the run by the ZR-1 with an LS9 coupled to a 6-speed manual transmission at Laguna Seca earlier this month quashed that rumor. The LS9 will be hand built starting in July 2008 at Wixom Performance Center alongside the LS7 as no more than 2,000 units are expected per year.
Source:
Leftlanenews.com Related:
PM’s Jim Dunne Debunks Corvette SS Rumors
2009 Caddy CTS-V Getting 600hp Blue Devil Corvette Engine? Technorati Tags:
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Video: 2008 Chevrolet Corvette Z06 Quick Drive

by Keith Cornett on October 16, 2007

Cars.com’s Dave Thomas reviews the new 2008 Chevrolet Corvette Z06. Nothing ground breaking here, but this is a very nice video review of the Corvette Z06:


Source:
Cars.com Related:
1963 Split Window Corvette Featured in PGR4 Commercials Technorati Tags:
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Corvette Recall: 2008 Keyless Access System Inoperative

by Keith Cornett on October 4, 2007

2008 Corvette Key FobCorvetteBlog.com yesterday told us about the 2008 Corvette Recall that is being initiated in regards to the 2008 Corvette’s keyless access system. Here are the details of Service Bulletin regarding the keyless access system for the 2008 Corvette: Subject: Bulletin GMP07-181 – 07260 Keyless Access System Inoperative
Models: 2008 Chevrolet Corvette
Message #: VSU20071584 DESCRIPTION: CUSTOMER SATISFACTION PROGRAM #07260 DATED: OCTOBER 1, 2007 NOTE: THIS PROGRAM IS IN EFFECT UNTIL OCTOBER 31, 2008. On certain 2008 model year Chevrolet Corvette vehicles, the keyless access system may become inoperative at times. The doors may not automatically lock or unlock, and the vehicle may not start. The DIC will also display a “NO FOBS DETECTED” message. If this condition occurs, the driver can lock or unlock the doors by pushing the buttons on the keyless access transmitter. The vehicle can be started by placing the transmitter in the glove box transmitter pocket with the buttons facing towards the passenger’s side. Then, with the vehicle in PARK (P) for an automatic transmission, press the brake pedal and the START button. If the vehicle has a manual transmission, press the clutch and the START button. CORRECTION
Dealers are to install a new module for the keyless access system. Refer to Customer Satisfaction Program Bulletin #07260 for the service procedure and other detailed information. EFFECTIVE DATE:
Owner mailing is scheduled to begin OCTOBER 8, 2007. GENERAL INFORMATION:
PART IS RESTRICTED. PLEASE CONTACT PRODUCT QUALITY CENTER AT 1-866-654-7654 TO ORDER. The Parts list follows: Part Number Description Quantity/Vehicle
25882862 RECEIVER, R/CON DR LK & THEFT DTRNT 1 VIN RANGE IS: From 85105302 thru 85106987
Source:
CorvetteBlog.com
Ken Fichtner Related:
C6 Corvette Roof Recall Technorati Tags:
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Take Control of Your 2008 Corvette’s NPP Exhaust

by Keith Cornett on September 12, 2007

One of the new options available on the 2008 Corvettes is the NPP Performance Exhaust. The exhaust features two ports on each side with one port on each side that remains closed by a butterfly valve while driving “normally” (a term loosely applied). When the driver demands more the closed valves spring wide open and unleashes the full volume from the 6.2 Liter LS3 V8. Corvette people dance to a different drum though and the first mod that an owner does to his NPP-equipped Corvette is pull the fuse on the butterfly valves which sets them open all the time. Enter Sunset Orange Creations. Recognizing the need for customization, they created the NPP/Z06 Exhaust Commander, the first RPM adjustable Bi-mode exhaust controller for the C6 and Z06 Corvette equipped with the NPP bi-mode exhaust. Using the Commander, you can set the butterfly valves to open at either a predetermined RPM or you can set them to full open. The commander works by tapping into the vacuum control solenoid to open and close the butterfly valves. Another connection is made with the Tachometer signal and a RPM control unit allows you to customize at what RPM the valves open. Really cool is the wireless remote that can be used to switch instantly between your predetermined RPM open setting and fully open setting. Sunset Orange Creations says the unit is 95% plug and play and installation instructions with detailed photos are provided. These kits work for all Z06, NPP and retrofitted NPP/Z06 Exhaust systems. The NPP Exhaust Commander is offered for $175 with free shipping in 48 states. For more information, visit Sunset Orange Creations.
Source:
Sunset Orange Creations Related:
2008 Corvette Wheel and Exhaust Photos Technorati Tags:
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