Trucks
For release: Oct. 28, 2007, 12:01 a.m. EDT
DETROIT – The Cobalt SS is at home on the boulevard or starting grid, thanks to development at Germany’s famed Nürburgring racing circuit – a winding, undulated road course of approximately 14 miles in length (22 km) and with more than 170 turns. It is considered by many professional racers and auto manufacturers as the ultimate test of a car’s mettle.
In fact, the Cobalt SS set a lap record for front-drive sport-compact cars at the “’Ring,” posting a time of 8:22.85 minutes – besting the previous record by more than 13 seconds.
“The Cobalt SS delivers an integrated driving experience that balances a strong, satisfying feeling of acceleration with a precise, responsive chassis,” said John Heinricy, GM Performance Division executive. “It has been tuned to deliver confident handling and road manners, while also maintaining overall ride comfort.”
GM Performance Division (GMPD) is responsible for the “go, stop and turn” capability of Chevrolet’s high-performance SS models, and its team of enthusiastic engineers made sure that the new, 2008 Cobalt SS not only achieved stellar performance on the track, it delivered it with a grin-inducing level of driving satisfaction.
Specific performance features include:
Chassis tuning
Conveying the Cobalt SS’s turbocharged horsepower to the pavement is an FE5 sport suspension that includes a host of other chassis, steering and braking revisions – and a set of gorgeous, 18-inch forged aluminum wheels. The elements pull together to give the vehicle surprisingly agile ride and handling characteristics, as well as an enviable maximum lateral acceleration rate of 0.9 g – making it one of the best-handling cars in the segment.
“There was a concerted effort to tune the Cobalt SS for competitive track performance,” said Heinricy. “This makes the car not only formidable in sanctioned competition, but it puts a finer edge on street performance.”
The MacPherson strut independent front suspension uses SS-specific gas-charged twin-tube struts; unique steering knuckles with optimized geometry; 27 N/mm linear coil springs with specific damper tuning; stiffer control arm handling and stabilizer bar bushings; and a direct-acting, 24-mm solid stabilizer bar. At the rear, the SS’s semi-trailing twist beam axle uses monotube gas-charged shocks with specific damper tuning, a 24-mm solid stabilizer bar, stiffer axle bushings and multi-rate coil springs (28-40 N/mm). StabiliTrak electronic stability control and traction control are standard.
More than cornering capability, the Cobalt SS’s chassis – along with the available limited-slip differential – also is tuned to mitigate conditions often associated with high-performance front-wheel-drive vehicles, such as torque steer and axle hop. The result is smooth application of the car’s full performance potential, quickening acceleration and/or lap times and ensuring a smooth, comfortable driving experience on the way to the office.
Quicker steering
An improved electric power steering (EPS) system is tuned to match the SS’s handling prowess. The rack-and-pinion gear has a quick 14.8:1 ratio, which is 20-percent quicker than other Cobalt models, and the new EPS provides improved precision and a more viscous feel.
Brembo fixed-caliper brakes
Four-wheel disc brakes with ABS are standard. They consist of large, 12.4-inch-diameter (315 mm) Brembo front vented rotors with premium, high-performance, four-piston fixed calipers in the front and 11.5-inch-diameter (292 mm) rear vented discs with single-piston calipers.
During spirited drives, this gives the Cobalt SS a more precise and consistent braking feel that resists fading, even after repeated occurrences of hard braking, such as the driving experience on a racetrack.
The Brembo calipers are visible behind one of the Cobalt SS’s most distinguishing features: a set of 18- x 7.5-inch polished forged aluminum wheels. The wheels ride on SS-specific 225/40-series Y-rated summer tires.
The standard anti-lock brakes are connected to the StabiliTrak electronic stability control system to enhance stopping and handling in emergency driving situations.
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Contact:
Nancy Libby
Chevrolet Communications
Phone: 313-667-2553
E-mail: nancy.libby@gm.com
Bob Tripolsky
Product Development Communications
Phone: 586-947-4756
Email: robert.r.tripolsky@gm.com
Phil Colley
GM Performance Division Communications
Phone: 586-492-2302
E-mail: phil.colley@gm.com