[LOWDOWN]

Originally Posted by LOWDOWN

From GM's announcement release:

The Z/28’s unique exterior is designed like a race car to produce downforce that presses the tires against the track for greater grip – up to 1.08 g in cornering acceleration – and faster lap times. The aerodynamically optimized design helped the Camaro Z/28 log a lap on Germany’s legendary Nürburgring road course that was four seconds faster than the Camaro ZL1’s and beat published times for the Porsche 911 Carrera S and the Lamborghini Murcielago LP640.

Power comes from the 7.0L LS7 engine, with dry-sump oiling, rated at an SAE-certified 505 horsepower (376 kW) and 481 lb-ft of torque (652 Nm). The engine will be built by hand at the new Performance Build Center within GM’s Bowling Green assembly plant.

A close-ratio six-speed manual transmission is the only transmission offered and power is distributed to the rear wheels via a Torsen limited-slip differential featuring a helical gear set, rather than traditional clutch packs, for optimal traction. The differential works in unison with Chevrolet’s proprietary Performance Traction Management system, allowing drivers to adjust the level of throttle and braking intervention to match their capability and driving environment.

The Camaro Z/28 is also one of the first production cars fitted with race-proven, spool-valve dampers, which allow four-way damping control, enabling engineers to precisely tune both bump and rebound settings for high-speed and low-speed wheel motions. The wider tuning range also allows dramatically greater damper stiffness without a significant change in ride quality. Additional chassis changes include stiffer spring and bushing rates for improved cornering response.

Lightweight, 19-inch forged aluminum wheels and Pirelli PZero Trofeo R tires reduce unsprung weight by 49.6 pounds (22.5 kilograms) per car compared to the 20-inch wheels standard on Camaro SS and ZL1.

The massive 305/30ZR19 PZero Trofeo R tires represent the first production-car application in the industry and are believed to be the widest front tire on any production car. To fully exploit their grip, the Z/28 also features Brembo Carbon Ceramic Matrix™ rotors and fixed, monoblock calipers. The large 394 x 36 mm front rotors are paired with six-piston calipers, while the 390 x 32 mm rear rotors are paired four-piston calipers. Compared to similar-size, two-piece steel rotors, the lightweight carbon discs save 28 pounds (12.5 kg) per car.

The combination of tire grip and braking power enable the Camaro Z/28 to achieve at least 1.5 g in deceleration. With standard front brake cooling ducts, the Z/28 is also capable of continuous track use.

I can't put my finger on it, at the moment, but I believe the WD = almost exactly 50-50.

4120 (ZL1 Curb) X 51.8% = 2134. Delete the blower and plumbing (and MRC), add the dry-sump (and Multimatics), delete 14 lb (brakes) and 24.8 lb (wheels/tires) and I suspect the Front weight will be near-1900 lb...on a 3827 Curb.

Originally Posted by TrackClub

Oh yeah absolutely: 40lb per corner of unsprung weight is huge! Remind me again what does it consist of? I thought wheels were about 10lb per corner and brakes less than that? Tires? Just curious.

My "inconsequential" comment was re lowering a ZL1 vis a vis its existing suspension.
Seek guidance from Pete...

When I was a youngen, a few decades ago, my mother told me to "look in the dictionary" when I'd ask her "how to spell" a word. In this case, I've supplied the "dictionary"...which was only a few posts above.