1983 C4 Corvette
1983 C4 Corvette
Unless you've been living under a rock, you know about the extremely potent 2023 Corvette Z06 that is on its way to the market sometime in late 2022. If you want to read about that, just look up any automotive website on the web and you can find out everything you know or you can go to this ride-along video/article with top engineers on the project, written by me for Muscle Cars & Trucks (C8 Corvette Z06 Engineers Share Untold Details On New Supercar: Video.
Since we all should know everything about the new Corvette Z06, I decided that we should take a look back at the birth of the first modern Corvette Z06. But first, let's take a short look at the birth of the very first Z06.
The first Z06 became available in 1963 and there were only 199 produced and sold. These Corvette Z06's sole purpose was to be sold for road course racing. They came with a 327 cu.in. (5.4-liter) engine, four-speed transmission, a beefed-up suspension, a massive brake system upgrade that included dual master cylinders, and an optional 36.5 US gal (138 l; 30 imp gal) tank.
The thing about these C2 Corvette Z06s was you didn't just go to the dealership and buy one, you had to know someone who knew what boxes to check in the order form if you wanted one of these race-ready (RPO Z06) Corvettes, and just like the 2001 Corvette Z06, you didn't get many luxuries with the car, it was truly for going fast.
This Corvette was built to surprise and dominate the market. The Z06 was designed for the track and pushed the boundaries of what was really possible from a production car that could drive to the track, make better times than its competition, and drive back home with the air conditioning kicking and the radio blasting.
Basic Spec:
The LS6 is essentially a more powerful version of Corvette's LS1 V8. The LS6 engine upgrades start with a redesigned intake manifold with better-flowing internal passageways. Reengineered cylinder heads create more flow through the intake and exhaust valves, and the combustion chambers were redesigned to reduce valve shrouding.
All these upgrades led to a higher compression ratio which then led to a redesigned thin-walled cast-iron exhaust manifold system to provide a smoother exit for the combustion escape.
Of course, all this extra flow wouldn’t be worth much without a redesigned camshaft. So a beefier cam was installed by Corvette engineers with more valve overlap and greater valve lift. Chrome-vanadium-steel valve springs and stronger pistons cast from a more durable alloy were implicated in the engine’s design for toughness. And finally, the LS6 was engineered with windows cast into the internal crankcase walls to help air retreat from the underside of the burning hot pistons.
This new engine setup gave the New Corvette Z06 385 horsepower at 6,000 RPMs and 385 lb-ft of torque at 4,800 RPMs, and a redline RPM of 6,500. In between all the power and the rear wheels was a beefed-up clutch (with lighter pedal effort), a larger-diameter driveshaft, and a revised six-speed manual transaxle. This new M12 gearbox was introduced with shooter 1st, 2nd, and 3rd gears to better utilize the new higher-revving LS6. All gears were 10-16 percent shorter except for the 4th gear which remained the same.
More power always means more changes all around. To accommodate the power of the LS6, Corvette went with a new FE4 suspension that included revised shock calibrations, a stiffer rear transverse leaf spring setup, and stiffer anti-roll bars for the front and rear.
To add ground support, each corner of the Vette receives 1-inch wider tires, bringing them up to 9.5-inch wide in the front and 10.5-inch wide in the back. New custom light-weight 10-spoke wheels were wrapped in Goodyear F1 Eagle tires: 265/40ZR-17s in the front and 295/35ZR-18s rears. The F1 Eagle SC tires were designed with more flexible sidewalls achieved by doing away with the famous run-flat tire design. This permitted a half-degree more negative camber to keep the tread flatter during hard cornering for track use.
To prove the Corvette was built for business, engineers found places around the car where they could shave pounds off the curb weight. Helping save weight was the deletion of the run-flat tire design, mufflers were made from Titanium, and the windshield and rear glass were all lightened to help bring the Corvette’s curb weight down to 3,118 pounds, that is 38 pounds lighter than its original form. A lot of weight was saved in the Titanium mufflers alone, but the weight of the new suspension offset the weight-saving by a lot.
The Cobra R was making some big waves at the track. Performance numbers were pretty impressive, and the Corvette Z06 was Chevrolet's answer to those performance numbers.
The Cobra R and the Z06 were pretty close in performance numbers at the time (numbers for Z06 below). The Cobra R turned numbers out of its 5.4-liter that looked a little like this: 385 horsepower and 385 lb.-ft. of torque (the same as the Z06), 0-60 mph in 4.7 seconds, a quarter-mile time of 13.2 (Ford tested) and 12.9 (Motor Trend tested) with a top speed of 170 mph, and stops from 60-0 in 127 feet.
Although the numbers were somewhat close, the Corvette beat out the Cobra R in other places. The Cobra R lacked air conditioning, an audio system, rear seats, sound dampening, and cruise control. The Corvette also lacked a back seat, but that's because it was never meant to have one, it wasn't a compromise. Also, because of the limited number of Cobra Rs that were built, the sticker price showed $55,5ish, but you couldn't buy one for under $75,000. The Corvette Z06 stuck pretty close to its price tag of just under $50,000 without a lot of limited edition inflation.
The 2001 Corvette Z06's proof of superiority is in the numbers. A 0-60-mph time is recorded at 4.3 seconds, and a 70-mph to 0 stop takes only 152 feet. In a quarter-mile sprint, the Corvette can cover it in 12.7 seconds at 113 mph. Hitting 150 mph will only take you 28 seconds total, while a top speed of 170 mph is easily manageable. Although the top speed does suffer a little bit as the C5 Vettes will hit 175 mph, that's because of the Z06's closer transmission clutch gear ratios.
Hitting corners is another place where the Corvette Z06 shows no mercy to its competitors. Pulling .98 Gs in and out of corners is just what this sports car does, and that actually beats out all other sports cars out of there including the Viper GTS and the Ferrari 360 Modena, which are above the Corvette Z06s price bracket by a lot.
Making sure everything was performance-built was what this Corvette was all about, even both the dual mesh grilles in the front and the rear brake coolers in front of the rear wheel wells are completely functional.
The 2001 Corvette Z06 is just like the new Z06s, although classified as a sports car, they perform like a supercar compared to its competition.
Oddly enough, this Corvette was named after the very odd song - "One Eye, One Horn, Flying Purple People Eater”, a Sheb Wooley hit back in the 50s.
There were two reasons for the paint job and the name for this 1959 Corvette. The idea for the paint job was because the Corvette racing team was having trouble finding their car in the pits and on the track - all the cars looked too similar to one another. Kind of like finding your car in a mall parking lot on the weekend, the week before Christmas.
So a standout color scheme was born. The color scheme that was created was a metallic purple for the base color and bright white for the trim and decals. Next, they needed a name for the Corvette, so they decided on the "Purple People Eater". It was kind of a no-brainer since the song itself was topping the charts in 1958-59, and the Purple People Eater Corvette was eating up all the competition on the track every single weekend.
Back in the 50s, a lot of racing teams were owned by dealerships and this Corvette team was no different. Nickey Chevrolet in Chicago was the owner of this team and, at the time, the largest factory dealership specializing in high-performance muscle car sales and service. Their parts department functioned as a huge speed shop.
When it came time for the Nickey Chevrolet Race Team to hire a driver and a mechanic, Nickey Chevrolet took some help and advice from none other than the legendary Zora Arkus-Duntov, the Corvette engineer and designer who made Corvette what it is today. Zora suggested they use an aggressive driver named Jim Jeffords and a talented mechanic who was known as the guy who could turn a “Javelin into a competitive race car," Ronnie Kaplan.
The Purple People Eater Corvettes (yes, there were three altogether) raced during the ‘58 and ‘59 seasons. During that time, they won the SCCA National B-Production titles and a race at Nassau Speed Week. During the 1959 season, the cars never finished worse than second place in any race, always making the Purple People Eater the car to beat at the track.
If you ordered a factory Corvette with race specs in the late 1950s, you received a Corvette with heater delete, and a heavy-duty brake and suspension package.
The Corvette came with a 283 Chevrolet V-8 with factory Rochester fuel injection and a four-speed manual transmission, the same way the Purple People Eater was raced. In an interview, Kaplan said, "GM helped with some technical advice, and I got that fuel injection figured out pretty quick." It was very reliable. I told Jim to keep that engine at about 6,000 rpm, and it never broke. He is a very big, strong man and was tough on equipment. I swear he could break off a shifter."
The last one known to exist is the “Purple People Eater MKIII”. It was sold for $800 to a Chip Miller and Ken Heckert, who raced the 1959 Corvette for a short time at Autocross events. Not knowing its future historical significance, it was parked and used as a workbench for a very long time.
After 14 years of being a garage workbench, the sharp eye of car expert/enthusiast Mike Philsbury notices that there were a few things different about some of the parts and options on the car. After some deep research, Mike, Chip, and Ken confirmed that they were eating their lunch every day on the 1959 Corvette “Purple People Eater MKIII”.
Knowing what they knew, Chip and Ken went to work and restored the Corvette back to its racing form - color and all.
All the muscle cars from this era were fun, but they were being produced on borrowed time. When the full weight of stricter emissions standards was implicated, the muscle car industry and its success in pleasing gearheads were over.