1982–1984 Corvette Cross-Fire Injection: GM’s EFI Gamble
Corvette engineers take the first step towards modern electronic fuel-injection
1982 was a serious year of challenges facing Corvette chief engineer Dave McLellan. The design team has several interesting “firsts”. 1982 was the first year since the ’53-’54 Corvettes that a manual transmission was not available. However, it was the first year that a four-speed automatic with Fourth gear as an overdrive. 1982 was the first year since 1965 that a fuel-injection system was used. Also, 1982 was the first time that a Corvette had an electronic fuel-injection system.
While the Cross-Fire Injection system was a hodgepodge of parts, it was essential for several reasons. Emissions and safety standards were increasing every year and had nearly choked to death every carbureted performance car.
Carbureted induction systems could not deliver the necessary EPA standards for engine certification
So, as the cars put on more weight and their engines were restricted more and more, performance went down the tubes. Electronic fuel injection was simply a requirement.
Also in the works was the development of the all-new structure of the C4 Corvette. This was a seriously fresh structural redesign of the Corvette since the early ’60s! A contributing factor to the adoption of the Cross-Fire injection system was the fact that the hood height of the new C4 was lower than that of the C3. So, the engine had to be shorter. “How” they made it all work was amazing. McLellan and his team made it all happen thanks to ingenuity and GM’s parts bin.
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The two main features of the Cross-Fire injection system were the unique Trans-Am racing intake manifold and two fuel injectors, the same as used on select 1981 Cadillacs. On the ’81 Corvette, a single injector was inserted into the Rochester carburetor to help the engine to pass emissions, but it was still a carbureted engine. The top plate of the Z-28 302 Trans-Am manifold was modified to take two injectors where the racing carbs would have been.
While the manifold performed well for a high-rpm racing application, it wasn’t happy under low-speed, normal driving conditions. According to Chief Engineer Dave McLellan, “The flat Trans-Am manifold gave such poor cylinder-to-cylinder distribution that we had to compensate with more fuel.”
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The Fuel-Injected Corvette was back! Sort of.
The dual fuel injectors were controlled by Chevrolet’s latest Computer Command Control unit that delivered 80 spurts per-second, instead of the 10 delivered by its predecessor. The computer took inputs from the throttle position, coolant temperature, engine vacuum, ignition timing, and oxygen sensors.
In response to the gathered data, the electric fuel pump, mounted inside the fuel tank, varied the pump pressure between 9 and 13 psi. Then, the solenoids above the two fuel injector units operated the fuel injectors. It was all a balanced dance between electronic pulses and mechanical devices. It was as simple as an electronic fuel-injection system as there could be.
Many less-advanced, hot-rod-type features were incorporated into the 1982 C3 Corvette. A solenoid-operated cold-air induction system was integrated into the hood. The exhaust system used a smaller, lighter catalytic converter, and the exhaust pipe from the manifold to the converter was redesigned to deliver hotter exhaust to the converter for better efficiency. And a small-diameter fan was used. When the ’82 model was completed and ready for sale, the 1982 Cross-Fire injection engine was rated at 200 horsepower, up 10 from the 1981 carbureted 350 engine.
“Performance” was … well, let’s not go there
Sources indicate that the performance between the 1981 L81 350 Corvette and the 1982 Cross Fire Injection C3 Corvette was nearly identical. Comparing automatic-to-automatic (because the 1982 Corvette was only available with an automatic transmission) shows the following.
1981 C3 Corvette: 0-60 in 8.0 seconds and the 1/4 mile in 16.1 seconds.
The 1982 C3 Corvette: 0-60 in 7.9 seconds and the 1/4 mile in 16.1 seconds at 84.5 mph.
The mph speed indicates that the Cross Fire Injection 1982 Corvette was not making much power. “Miles per hour” in drag racing is a direct indicator of how much horsepower a car is putting to the ground.
Except to say that most road tests of the 1982 model consistently reported that driveability and throttle response were much improved, as well as fuel mileage. In general, the ’82 Corvette was a “nice car,” and the Collector Edition was a beauty.
The Cross-Fire Injection engine served its purpose
In 1982, the Cross Fire Injection was a big deal. Cadillac led the way with electron, whichic fuel injectors for GM, and Dave McLellan put it into the Corvette. From the start, Chevrolet knew this was just the beginning. The Cross Fire Injection system was certified for production, and the slightly improved 1984 C4 Corvette version delivered enough grunt to wow the press in the new and vastly improved C4’s suspension and huge tires. However, when the Cross Fire Injection system was replaced with the for-real fuel-injected L98 in ’85, no one shed a tear.
It was unfortunate that the L98 350 with its electronically-controlled fuel-injection setup, with 8 injectors, didn’t come into production in 1976 or 1981, instead of 1986. The Corvette story, as well as GM’s remaining muscle cars, the Camaro Z28 and Pontiac Trans-Am Firebird, would have been very different.
But, everything in its time. – Scott
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