Mark Stielow, the Z/28's engineering manager, explains that "the 19s are lighter, have less rotational inertia, and let us lower the car.
The special lightweight wheels are 11 inches wide in the front and shod with 305/30ZR-19 Pirelli P Zero Trofeo R tires all around.
Chevy tells us that these are the widest tires mounted on the front of any production car.
A streetable track tire, the Trofeo Rs have a tread-wear rating of 60 and are manufactured in the same plant as Pirelli's F1 rubber.
suspension geometry is unchanged from the Camaro SS 1LE, but the spring rates are about 20 percent stiffer and the car uses Multimatic monotube shocks with F1-style spool valves.
says this technology provides greater freedom to independently tailor jounce and rebound settings for low- and high-speed suspension motions.
says that having more downforce in the rear than in the front enhances stability.
There's even an accessory Gurney flap that attaches to the rear wing for more.
Unfortunately, all of this extracts a drag penalty.
While the standard Camaro has a Cd of about 0.35, rising to 0.39 in the ZL1, the Z/28's
is even higher.
The aero appendages, the wide wheels, and the fender extensions add up to a car that "knocks a big hole in the air," as Stielow
wouldn't release any performance claims for the new Z/28
, but it's safe to say that with stickier tires, better weight distribution, and a power-to-weight ratio only slightly worse than a ZL1's, the Z/28
will accelerate almost as quickly.