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    C4-C5

    Overview of the C4 Corvette

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    1953 Corvette
    1953 Corvette
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    The C4 Corvette was mass-produced between 1984-1996 and was a direct breakaway from Zora Arkus-Duntov’s C3 design. This new model brought a completely new chassis and more modern styling for the time period. The chief architect of the C4 Corvette was Dave McLellan who had taken over as the new Corvette designer and slowly propelled the brand into the future. It was equipped with better storage access (for your golf clubs) with the standard glass hatchback plus a removable panel. The Corvette came with an electronic dashboard with a digital liquid crystal display instrument cluster that surely made you feel like you were in the future.

    1984 Corvette
    1984 Corvette

    The C4 Corvette Early Years

    In 1984 the C4 Corvette was equipped with the L83 engine which is a 5.7L small block V8 with a Cross-Fire injection system. This did not last long as this motor only produced around 200 hp at 4,300 rpm and the Corvette crowd was not happy. The 0-60 for this year was a blazing 7 seconds which seems like an eternity these days. Again, this was the start of a change for Corvette so understandable it took some time to find the footing needed to advance the technical specifications.

    This brings us to 1985. Chevrolet introduced a new small block engined called the L98 which had Tuned Port Injection or TPI. This motor produced closer to 230 hp at 4,000 rpm which was definitely a step up from the L83 but still had its limitations once the sportscar was pushed passed 4,000 rpm. The good news is the aftermarket parts manufacturers quickly stepped in and produced advancements for the engine.

    From ’84 to ’88, C4 Corvettes were produced with a 4+3 manual transmission with automatic overdrive. This hybrid combination was a nightmare for owners. This transmission was plagued with issues as the overdrive would fail constantly and in some cases, the reverse would completely stop working.

    1989 Corvette Convertible
    1989 Corvette Convertible

    Big Changes Made in 1989 to the C4 Corvette

    So it is the year 1989 and Chevrolet had a ton of feedback by now from its loyal followers. With that said the new Corvette was equipped with a ZF-6 speed manual transmission made by a German parts manufacturer with a highly experienced transmission team. The hybrid system was completely removed and replaced by two manually selected overdrives. This transmission has gone down in the Corvette history books as one of the best overall changes during the life of the C4 Corvette.

    Not much changed on the engine side of the project but the 1989 Corvette did receive a bit more juice in the power plant pushing the horsepower to 240. This combination of the L98 motor combined with the ZF-6 transmission stayed together up until 1991.

    The C4 Corvette Interior Refresh in 1990

    1990 C4 Corvette Interior
    1990 C4 Corvette Interior

    After all the focus on the engine and transmissions for the C4 Corvette, it was time to address the changes needed in the interior. The 1990 model was equipped with a driver-side airbag system and Chevrolet reverted back to the analog gauges. The fad of digital was over for now! The changes continued into 1991 with the removal of the black trim band around the Corvette and added color matching based on the body color. The side marker lights were modified and extended up to the bumper and the rear taillights were changed to rounded corner square lights. This would be the only year an owner could get all the modifications paired up with the L98 and ZF-6 combo, which makes this C4 Corvette very rare.

    The 1992 C4 Corvette Cranks Up the Horsepower

    The retirement of the L98 made way for the LT1 engine which is a 5.7-liter small block V8 that extended the C4 Corvette into the 300 horsepower range. This easily pushed the 0-60 mph time closer to 5.7 seconds which was scorching in the early 90’s. Every kid in America dreamed of owning one of these beauties at some point in their life. One of the rare changes in this engine setup was the Opti-spark which was moved to the front of the engine. This alone caused some problems as it was prone to moister buildup causing critical sensors to fail and leaving the engine running rough. This modification was not clearly designed correctly and ended up frustrating a lot of Corvette owners over time.

    The End of the C4 Corvette Era Brings the Final Touches of Excellence

    Over the final two years, of the C4 Corvette’s lifespan came many changes, options, and modifications. Chevrolet addressed the problems with the Opti-spark moister issue and made the proper modifications. Also, introduced was the J55 Heavy Duty brake package that became standard on all Corvettes which included 13″ rotors with larger calipers. This provided a major upgrade to the braking performance. Per United States laws the C4 Corvette was equipped with both driver-side and passenger-side airbags. Finally in 1996 Chevrolet introduced the LT4 motor to all manual transmission models. This engine was equipped with upgraded heads and valves among other smaller changes. The horsepower jumped again to 330 at 5,800 rpm which was just a small sign of changes coming in the C5 Corvette LS1 engine which is legendary.

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