Chevrolet Corvette C4 ZR-1 - 1990

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The Chevrolet Corvette (C4 - fourth generation) is a sports car produced by American automobile manufacturer Chevrolet from 1983 to 1996. The last C4 was produced on June 20, 1996.

General Motors acquired Group Lotus, a UK based engineering consultant and performance car manufacturing firm, during 1986. The Corvette division approached Lotus with the idea of developing the world's fastest production car, to be based on the C4 generation of the Corvette. With input from GM, Lotus designed a new engine to fit in place of the L98 V8 that was powering the standard C4.

In late 1987, rumors of an all-new, high performance Corvette built upon the fourth generation platform began circulating among the automotive press. Dubbed the “King of the Hill,” the secretive supercar was said to be a world-beater, and in March of 1989, GM debuted its impressive Corvette ZR-1 at the Geneva Motor Show.

The Corvette ZR-1 has high performance engine, the 375 hp (280 kW) 5.7-litre DOHC 32-valve LT5.

With an upgraded braking and steering systems, the ZR-1 is fitted with Goodyear Eagle Gatorback tires having size of P315/ 35ZR-17 specially made for the car along with bigger ventilated disc brakes, with an ABS system manufactured by Bosch. Due to the heavier engine and body work along with wide tires, the ZR-1 is 200 lb (91 kg) heavier than the standard C4 Corvette.

In early March 1990, the ZR-1 would set a new record for the highest 24 hour-5,000 mile land-speed by going over a speed of 175 mph (282 km/h).

Tested performance figures by Road & Track magazine include a 0–60 mph (0–97 km/h) acceleration time of 4.9 seconds, a quarter mile time of 13.4 seconds, braking distance of 132 ft from 60 mph and 233 ft from 80 mph along with skidpad acceleration of 0.94 g. The car's tested top speed by the magazine amounted to 179 mph (288 km/h).

1990 Chevrolet Corvette ZR-1 (man. 6) (model since mid-year 1989 for North America U.S.) car specifications
Make: Chevrolet (USA)
Model: Corvette C4 1984-1996
Submodel: Corvette C4 ZR1 1989-1995
EEC segmentation: S (sport cars)
Subsegment: S-C (sport coupes) - executive
Class: grand tourer
Body style: hatchback coupe
Doors: 3

Engine manufacturer: GM Chevrolet-Lotus LT5
Engine type: spark-ignition 4-stroke
Fuel type: gasoline (petrol)
Fuel system: indirect injection
Valves per cylinder: 4
Additional features: Tuned-Port Fuel Injection
Charge system: naturally aspirated

Cylinders alignment: V8 5.7L
Displacement: 5732 cm3 / 349.8 cui
Horsepower net: 279.5 kW / 380 PS / 375 hp (SAE net) @ 5800rpm*
Torque net: 502 Nm / 370 ft-lb @ 4800rpm*
7000/7200-rpm redline
*power curve from corvetteactioncenter.com
"more than 300 ft-lb of torquee from 1000rpm up..." quote from MotorWeek | Retro Review: 1990 Chevrolet Corvette ZR-1

Curb weight (without a driver): 1572 kg / 3466 lbs
Weight Distribution 50.3% front (Carfolio)
Fuel Tank Capacity 76 L / 20.1 US gallons / 16.7 UK gallons

Traction: RWD (rear-wheel drive)
Gearbox: ZF
Transmission type: manual
Number of gears: 6
Gear ratios (overall):
I 2.68
II 1.80
III 1.31
IV 1.00
V 0.75
VI 0.50
R 2.50
Final drive ratio std: 3.45

Standard tires: 275/40 ZR 17 (F); 315/35 ZR 17

BRAKES F/R VeDi/VeDi-S
FRONT BRAKE DIAMETER 330 mm
REAR BRAKE DIAMETER 330 mm

Braking distance
60 mph - 0 40,2m (132 ft)**
70 mph - 0 51.8m (170 ft)***
100 kph - 0 --------------------- 41.7m tsa

Factory claim
claimed maximum speed of 190mph (304kmh/h) ----- OK (287 tsa)
0-100 km/h (sec): 4.5 ---------- 4.85 tsa

Estimated / Tested
Top speed: 179 mph (288 km/h)**
0-100 km/h (sec): 4.9 ---------- 4.85 tsa
0-160 km/h (sec): 10.6 ---------- 10.28 tsa
0-200 km/h (sec): 16.9 ---------- 16.28 tsa

Drag times:
0- 1/4mile (sec): 12.8**** ---------- 12.97 tsa
0- 1km (sec): 23.5 ---------- 23.33 tsa
**Road & Track magazine
****tested Motorweek
***tested Car&Driver (Jun89)

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