Chevrolet Corvette C6.R GT2
The Corvette C6.R was introduced to the world in 2005, as both the motorsports testbed of the forthcoming C6 Z06 and C6 ZR1, and as an out and out GT race car. It had two major specs for the two major events it always entered: GT1 (or, as it was renamed, GTE) at Le Mans, and GT2 (or as it was renamed, GTE-Daytona) for the Daytona 24 Hours and IMSA Series races.
The C6.R ZR1 GT2, if you were to use its full name, was the model used in the last four years before the Corvette C7.R was introduced, and had a slick sequential manual operated by paddles that was combined with the rear differential to create a rear transaxle. This style of transaxle eventually made it into the road-going Corvette, especially the Grand Sport and ZR1 of the C7 generation.
In terms of engine power, three different engines were used throughout the C6.R lifetime. The GT1 spec for Le Mans used a 7.0 liter LS7.R engine, producing a chunky 590 HP. This GTE and GT2 specs were introduced by a 6.0 liter LT5.R for 2009, and a 5.5 liter LT5.R from 2010 to 2013. The GT2 spec engine produced about 470 HP, depending on altitude and temperatures at race time. As well, neither the LS7.R or LT5.R engines had superchargers, as they were too large in displacement to warrant forced induction in either racing spec.
The Chevrolet Corvette C6.R GT (also known as the Corvette C6.R ZR1) was the race-going equivalent of the Chevrolet Corvette C6 ZR1. The C6.R GT was constructed by Pratt & Miller and ran by Corvette Racing to compete in the GT2 class (later renamed GT in ALMS and GTE Pro at Le Mans) of the American Le Mans Series and the 24 Hours of Le Mans. The GT2 version of the C6.R was built in 2009 and made its debut half way through the ALMS season. With the global financial crisis affecting the automotive industry hard, the GT2 class was a cheaper and more competitive option for Corvette Racing, especially seeming the competition in the GT1 class had diminished. The GT2 C6.R showed good pace on its debut however the rules would restrain it from being as dominate as its GT1 counterpart.
Original Press Release
Corvette Racing will open a new chapter with the competition debut of the next-generation Corvette C6.R at the Mid-Ohio Sports Car Course on August 6-8. In anticipation of a single GT class in 2010, Corvette Racing will test and develop the latest Corvette C6.R in the GT2 category in the final five rounds of the 2009 American Le Mans Series. With the upcoming move to a unified GT category, the twin Compuware Corvette C6.R race cars will compete against rivals representing Ferrari, Porsche, BMW, Aston Martin, Jaguar, Viper, Panoz, and Ford.
Based on the Corvette ZR1 supercar, the next-generation Corvette C6.R has even stronger links to the production version of America’s performance icon than its predecessors. The GT2 rules require the use of many production-based components, expanding the opportunities for the two-way transfer of technology between the race track and the showroom. The updated Corvette C6.R utilizes the ZR1’s body design, aerodynamic package, aluminium frame and chassis structure, steering system, windshield, and other components. The race team has prepared the cars for the rigors of endurance racing with safety and performance modifications as permitted by the GT2 rules.
“One of the many benefits of the Corvette Racing program has been the opportunity to demonstrate the technology transfer between the race car and the production car,” said Mark Kent, GM Racing manager. “The global movement toward a single GT class will allow us to compete head-to-head with more marketplace competitors while increasing both the production content of the Corvette C6.R race cars and the relevance of racing to our customers. This is a step that positions Corvette for the future of production-based sports car racing worldwide, and a move that is perfectly aligned with GM’s marketing and business objectives in racing.”
Previous versions of the Corvette C5-R and C6.R race cars have dominated the GTS and GT1 categories in the last decade, winning 77 races and eight consecutive ALMS championships. The GT1 Corvettes were retired following Corvette Racing’s sixth victory in the 24 Hours of Le Mans on June 14, 2009.
“In our decade in GT1, our primary focus has been on racing victories and the validation of the Corvette as a world-class sports car,” said Tadge Juechter, Corvette chief engineer. “As an authentic way to communicate to knowledgeable customers, nothing beats racing. As a cost-effective means to improve vehicle performance, nothing beats racing. These are the reasons racing is in Corvette’s DNA.
“Behind the scenes, the race team and the production car team have grown closer together, finding numerous ways to support each other and to make both cars better,” Juechter said. “Most automotive companies give lip service to claims like ‘racing improves the breed’ or ‘race on Sunday, sell on Monday’. For team Corvette, it is a daily reality. It is now impossible to imagine one team without the other.”
The upcoming GT regulations required a comprehensive redesign of the Corvette C6.R package. In place of the GT1 Corvette’s steel frame, the GT2 version utilizes the production ZR1’s hydroformed aluminium frame as the foundation for a fully integrated tubular steel safety cage. The GT1 version’s wide, louvered fenders are replaced by production-based ZR1 fenders with wheel flares. In accordance with the aerodynamic regulations, the rear wing is reduced 25 percent in width, the diffuser is a flat panel without fences or strakes, and the splitter extends only as far as its production ZR1 counterpart. Steel brake rotors have replaced the carbon discs used previously, and the wheels are aluminium instead of magnesium. The adjustable steering column and steering rack are sourced from the street Corvette.
“Integrating a steel safety cage that meets GM Racing’s stringent standards as well as the strength and durability targets required in racing is a challenge with an aluminium frame,” explained Corvette Racing engineering director Doug Louth. “Working in conjunction with the structure and chassis engineers in the Corvette production group, we designed, built and tested numerous examples before we finalized the configuration. We went through a similar process with the production Corvette group on the body design and aero components. It was truly a collaborative effort between the production engineers and the race team.”
In the remaining races in 2009, the Corvette race cars will be powered by 6.0-liter GM small-block V8s that are based on the 7.0-liter LS7.R that powered the GT1 version. This reduction in displacement was achieved by shortening the crankshaft stroke from 3.875-inch to 3.32-inch. The diameter of the series-mandated intake air restrictors was decreased from 30.6 mm to 28.6 mm, with a corresponding reduction in engine output from 590 to 470 horsepower. A 5.5-liter production-based GM small-block V8 is currently under development and will be introduced at the start of the 2010 season. The Corvette Racing team is continuing its commitment to green racing with the use of E85R ethanol racing fuel.
While much of the hardware has changed, Corvette Racing’s roster of championship-winning drivers remains the same. Johnny O’Connell and Jan Magnussen will share the No. 3 Compuware Corvette C6.R, and Oliver Gavin and Olivier Beretta will drive the No. 4 Compuware Corvette C6. R. They will be joined by Antonio Garcia and Marcel Fassler at Petit Le Mans.
Corvette Racing also has the continued support of its long-time sponsors and technical partners. Compuware is the team’s primary sponsor, with Mobil 1 supplying low-friction lubricants and Michelin providing its world-class racing tires. Corvette Racing’s sponsors also include XM Satellite Radio, UAW-GM, Genuine Corvette Accessories, Bose, Motorola, PRS Guitars, and BBS.
“Compuware leads the world in application performance solutions, and partnering with Corvette Racing gives us another high-tech, high-performance and high-impact platform for communicating to our customers and prospects,” said Compuware Chairman and CEO Peter Karmanos, Jr. “The launch of the Corvette C6.R in GT2 is a great extension to our relationship with General Motors, Chevy and Corvette. We look forward to even more victories in the months ahead.”
The GT2-spec Corvettes were designed, built and tested on a compressed schedule. The program was approved and announced in September 2008, and construction of the first chassis began in early December. The first track test was conducted at Road Atlanta on April 8-9, followed by single-car tests in Elkhart Lake, Wis., and Sebring, Fla.
“The Corvette Racing team had to take on several challenges simultaneously to execute this program,” said Doug Fehan, Corvette Racing program manager. “We were preparing for our regular race season with the GT1 cars while designing the GT2 version. The cars were being built and tested in the midst of our preparations for Le Mans. The team was multi-tasking to the extreme, operating on a leaner budget and a faster timeline. It was a monumental effort to have these cars ready for the Mid-Ohio race.”
Advanced technology tools enabled Corvette Racing to meet the challenge. “With the short development schedule, we relied on ‘virtual’ design and computer simulation more than ever before,” said team manager Gary Pratt. “We made design, engineering and manufacturing simultaneous processes as much as possible. For example, while the first chassis was being built, we continued to run computer simulations on suspension geometry and refined the aerodynamics using CFD (computational fluid dynamics) because these areas didn’t have to be finalized until later in the production timeline. We have developed the capabilities to do finite element analysis and composite fabrication in-house, which has accelerated our design and production cycle.
“We’re not running for a championship this year, so we’re looking at the upcoming races as preparation for 2010,” Pratt said. “Our only testing from this point on will be at the races, and we’ll be doing it in the public eye. Certainly we hope to achieve the same level of success that we did in GT1, but the caliber of the competition we will face in GT2 is very high. When we started in GT1 in 1999, it took a while to win; now we have 10 years of experience that should help us to become competitive in a new category. Everyone at Corvette Racing is looking forward to the challenge.”
Fehan is confident but cautious about Corvette Racing’s prospects in the GT2 category: “In the limited testing we’ve done so far, we’ve been very impressed with the car’s durability, reliability and performance,” he said. “We’ll continue to focus on those three factors in the upcoming races. We view the rest of this year as a development cycle, and we believe that our experience as a team in preparation, race strategy, and pit stop execution should allow us to be competitive even if there is a slight performance disparity.”
The GT2 version of the Corvette C6.R will make its debut in the Acura Sports Car Challenge at the Mid-Ohio Sports Car Course in Lexington, Ohio. The two-hour, 45-minute race is scheduled to start at 3 p.m. EDT on Saturday, August 8. ABC will televise the race tape-delayed at 2:30 p.m. EDT on Sunday, August 9.
2009 ALMS GT2 Class
|Aug 8||Mid-Ohio||Start 3-6||Finish 2-4|
|Aug 16||Road America||Start 4-5||Finish 3-6|
|Aug 30||Mosport||Start 4-5||Finish 1-3|
|Sept 26||Road Atlanta||Start 3-7||Finish 4-6|
|Oct 10||Laguna Seca||Start 1-3||Finish 2-10|
2010 ALMS GT Class
|Mar 20||12hrs of Sebring||Start 5-6||Finish 8-9|
|Apr 17||Long Beach||Start 3-5||Finish 2-9|
|May 22||Leguna Seca||Start 3-4||Finish 3-6|
|June 12-13||24hrs of Le Mans||Start 1-2||Finish DNF-DNF|
|Jul 10||Utah Grand Prix||Start 7-8||Finish 3-10|
|July 24||Lime Rock||Start 4-6||Finish 5-DNF|
|Aug 7||Mid-Ohio||Start 3-4||Finish 2-DNF|
|Aug 22||Road America||Start 1-2||Finish 3-4|
|Aug 29||Mosport||Start 4-6||Finish 4-5|
|Oct 2||Petit Le Mans (Road Atlanta)||Start 6-7||Finish 1-6|
2011 ALMS GT Class
|Mar 19||12hrs of Sebring||Start 2-9||Finish 3-4|
|Apr 16||Long Beach||Start 2-9||Finish 2-5|
|June 11-12||24hrs of Le Mans||Start 4-6||Finish 1-DNF|
|July 9||Lime Rock||Start 4-5||Finish 9-10|
|Jul 24||Mosport||Start 6-8||Finish 1-6|
|August 6||Mid-Ohio||Start 5-8||Finish 2-6|
|Aug 20||Road America||Start 2-6||Finish 5-DNF|
|Sept 3||Baltimore||Start 2-4||Finish 3-7|
|Sept 17||Leguna Seca||Start 2-8||Finish 5-7|
|Oct 1||Petit Le Mans (Road Atlanta)||Start 7-8||Finish 4-DNF|
2012 ALMS GT Class
|Mar 17||12hr of Sebring||W/ WEC, Start 3-4
ALMS Only, Start 1-2
|W/ WEC, Finish 2-4
ALMS Only, Finish 2-3
|Apr 14||Long Beach||Start 2-3||Finish 1-4|
|May 12||Laguna Seca||Start 2-5||Finish 1-2|
|June 16-17||24hrs of Le Mans||Start 3-5||Finish 5-6|
|Jul 7||Lime Rock||Start 3-6||Finish 2-3|
|July 22||Mosport||Start 1-2||Finish 2-10|
|Aug 4||Mid-Ohio||Start 5-6||Finish 1-13|
|Aug 18||Road America||Start 3-5||Finish 4-6|
|Sep 1||Baltimore||Start 1-3||Finish 2-6|
|Sep 15||Virginia Int. Raceway||Start 3-4||Finish 1-8|
|Oct 20||Petit Le Mans (Road Atlanta)||Start 4-5||Finish 2-12|
2013 ALMS GT Class
|Mar 16||12hrs of Sebring||Start 2-5||Finish 1-DNF|
|Apr 20||Long Beach||Start 4-6||Finish 4-5|
|May 11||Laguna Seca||Start 3-5||Finish 1-10|
|June 22-23||24hrs of Le Mans||Start 6-7||Finish 4-7|
|Jul 6||Lime Rock||Start 3-5||Finish 2-6|
|July 21||Mosport||Start 2-6||Finish 1-4|
|Aug 11||Road America||Start 2-3||Finish 2-3|
|Aug 31||Baltimore||Start 3-5||Finish 1-2|
|Sep 21||COTA||Start 2-3||Finish 1-DNF|
|Oct 5||Virginia Int. Raceway||Start 8-9||Finish 3-6|
|Oct 19||Petit Le Mans (Road Atlanta)||Start 4-7||Finish 6-10|
Crazy GT2 Finish at Leguna Seca 2009
Corvette Racing Scores 1st Win in GT2 at Mosport 2009
GT2 C6.R on the Track
Corvette vs Ferrari at Le Mans 2010