The 2010 Grand Sport Convertible
Bowling Green, KY – Grand Sport. It’s one of the most storied monikers in Corvette’s illustrious racing heritage and it is returning the lineup. Chevrolet announced the new, 2010 Corvette Grand Sport at the 12th annual C5/C6 Corvette Birthday Bash, held at the National Corvette Museum, in Bowling Green, KY.
The new Grand Sport model combines the Corvette’s LS3-based powertrain with unique, wide-body styling and a racetrack-bred suspension for a distinctive, starting grid-ready performer. It is offered in both coupe and convertible body styles, with either a six-speed manual or six-speed automatic transmission. The LS3 6.2L engine is rated at 430 horsepower and 424 lb.-ft. of torque with the standard exhaust system. An optional two-mode exhaust system elevates the power ratings to 436 horses and 428 lb.-ft.
The Grand Sport replaces the Corvette’s previous Z51 package and brings a greater degree of handling performance, with wider wheels and tires; revised shock, stabilizer bar and spring specifications and specific gearing. The equipment enables cornering capability of 1.0 g, as well as a 0.2-second improvement in 0-60 acceleration vs. standard LS3-powered models.
Grand Sport coupe models equipped with the manual transmission are uniquely outfitted for racetrack competition, too, with a dry-sump oiling system, differential cooler and a rear-mounted battery.
The complete list of content and special features for the Grand Sport includes:
* Wider front and rear fenders – including specific front fenders with integrated Grand Sport badges
* Z06-style front splitter and tall rear spoiler
* Functional brake ducts and extra cooling
* Unique 18-inch front and 19-inch wheels; painted finish standard and chrome finish optional
* Large 275/35ZR18 tires in front and 325/30ZR19 tires in the rear
* Z06-size brakes, including 14-inch (355 mm) front rotors with six-piston calipers and 13.4-inch (340 mm) rear rotors with four-piston calipers
* Specific manual transmission gear ratios
* Specific rear axle ratio on automatic-equipped modles
With its special equipment, the Grand Sport offers a unique blend of performance and amenities. Its suspension package approaches that of the Z06, but includes a removable roof on coupes (Z06 has a fixed roof) and, of course, the availability of a convertible body style. Also, the paddle-shift six-speed automatic transmission is offered, while a manual transmission is the only choice with the Z06.
All of Corvette’s exterior colors are offered on the Grand Sport and an available Heritage package adds iconic front fender hash marks offered in four colors, as well as two-tone seats with Grand Sport embroidery. The Grand Sport can be ordered with 1LT, 2LT, 3LT and 4LT trim packages, too.
Grand Sport History
Envisioned by legendary Corvette engineer Zora Arkus-Duntov as a factory-built, lightweight and race-ready production model that would trump domestic and foreign road-racing competitors, the original Corvette Grand Sport was a promising idea stymied by GM’s agreement to stay out of manufacturer-backed motorsports.
The planned 125 production models required for racing-class homologation were never built, but five prototypes based on the styling of the 1963 Corvette were hand-assembled under Duntov’s watchful eye. And while they looked like production models, the prototypes were purpose-built racecars that shared little with their assembly-line cousins. Duntov also oversaw the Grand Sport engine program that featured a special, 377-cubic-inch small-block V8 and used side-draft carburetors.
Although never officially sanctioned by General Motors, the five Grand Sport prototypes saw extensive racing experience throughout the 1960s in the hands of “private” racers who had strong contacts within Duntov’s engineering circle. All five original cars are accounted for today and are among the most valuable in the collector market.
Chevrolet offered a limited-edition Grand Sport production model in 1996, commemorating the original racing cars and marking the end of the C4 era in Corvette production. All of the 1,000 examples were painted Admiral Blue and featured a white center stripe and red “hash mark” graphics on the left front fender, a graphic scheme that mimicked the look of some of the original racecars.
Models: Chevrolet Corvette Grand Sport Coupe and Convertible
Body styles / driveline: two-door hatchback coupe with removable roof; rear-wheel drive (Coupe and Convertible)
Construction: composite body panels, hydroformed steel frame with aluminum and magnesium structural and chassis components (coupe); composite and carbon-fiber body panels, hydroformed aluminum frame with aluminum and magnesium structural and chassis components (Z06)
Manufacturing location: Bowling Green, KY.
Engines: 6.2L V8 LS3
Displacement (cu in / cc): 376 / 6162
Bore & stroke (in / mm): 4.06 x 3.62 / 103.25 x 92
Block material: Cast aluminum
Cylinder head material: Cast aluminum
Valvetrain: overhead valve, two valves per cylinder
Fuel delivery: SFI (sequential fuel injection)
Compression ratio: 10.7:1
Horsepower (hp / kW @ rpm): 430 / 321 @ 5900* w/ std. exhaust, 436 / 325 @ 5900* w/ opt. exhaust
Torque (lb-ft / Nm @ rpm): 424 / 575 @ 4600* w/ std. exhaust, 428 / 580 @ 4600* w/ opt. exhaust
Recommended fuel: premium recommended not required
EPA estimated fuel economy (city / hwy): 15 / 25 (automatic), 16 / 26 (manual)
Transmissions: Tremec six-speed manual, Hydra-Matc 6L80 six-speed paddle-shift automatic
Gear ratios (:1)
First: 2.97 / 4.03
Second: 2.07 / 2.36
Third: 1.43 / 1.53
Fourth: 1.00 / 1.15
Fifth: 0.71 / 0.85
Sixth: 0.56 / 0.67
Reverse: 3.28 / 3.06
Final drive ratio: 3.42 / 2.73
CHASSIS / SUSPENSION
Front: short/long arm (SLA) double wishbone, cast aluminum upper & lower control arms, transverse-mounted composite leaf spring, monotube shock absorber
Rear: short/long arm (SLA) double wishbone, cast aluminum upper & lower control arms, transverse-mounted composite leaf spring, monotube shock absorber
Traction control: electronic traction control; Active Handling
Type: front and rear power-assisted disc with ABS with six-piston front and four-piston rear calipers, cross-drilled rotors
Rotor diameter x thickness (in / mm): front: 14 x 1.3 / 355 x 32, rear: 13.4 x 1 / 340 x 26
Brake swept area (sq in / mm): front: 309 / 1994, rear: 269 / 1735
WHEELS & TIRES
Wheel size: front: 18-inch x 9.5-inch, rear: 19-inch x 12-inch
Tires: front: P275/35ZR18, rear: P325/30ZR19
Wheelbase (in / mm): 105.7 / 2685
Overall length (in / mm): 175.6 / 4460
Overall width (in / mm): 75.9 / 1928
Overall height (in / mm): 48.7 / 1236
Curb weight (lb / kg): 3311 / 1502 (Grand Sport Coupe), 3289 / 1492 (Grand Sport Convertible)
Weight distribution (% front / rear): 51 / 49
Seating capacity: 2
Interior volume (cu ft / L): 52 / 1475
Headroom (in / mm): 38 / 962
Legroom (in / mm): 43 / 1092
Shoulder room (in / mm): 55 / 1397
Hip room (in / mm): 54 / 1371
Cargo volume(cu ft / L): Coupe: 22 / 634, Convertible: 11 / 295 (top up); 7.5 / 212 (top down)
Fuel tank (gal / L): 18 / 68.1
Engine oil (qt / L): 5.5 / 5.2 (automatic transmission), 10.5 / 9.9 (manual transmission)
* SAE certified.
Note: Information shown is current at time of publication.