Get Ad-Free Access: Just $39/year
To understand why the Guldstrand GS-90 coupe and convertible differ so much, keep in mind that during the course of the C4 development cycle, no ZR-1 convertibles were planned, so the base C4 convertible had to be used in building a GS-90 Nassau Roadster, as it was called. The coupe, however, had the advantage of using the ZR-1 platform right from the get-go.
Front view of LT5 engine bay
At the heart of the ZR1 Corvette resides the supercharged 6.2L LT5. GM’s engineering department was also tasked with producing the ZR1’s engine, which would have to perform at a higher level than that of the Z06’s supercharged LT4 small-block. The 755 HP supercharged LT5 would elevate the Corvette’s performance to a level never before achieved.
Front view of Chevrolet LT2 engine
With the C8’s transition to a mid-engine format already greenlighted, GM’s engineering department got down to the business of coming up with an equally groundbreaking engine to power the Corvette’s incoming eighth iteration. The LT2, in its current state, is nothing short of immensely powerful, with 495 HP at 6450 RPM, and 470 lb-ft of torque at 5150 RPM.
In 2006, the company behind the Corvette C6.R pulled out all the stops and developed a Corvette (based on a Z06 donor car and a lot of amazing engineering) that featured an unprecedented amount of horsepower and torque under its hood while packing ultimate luxury inside its ultra-wide carbon-fiber body. The car, which was revealed at the SEMA show in 2007, was called the C6RS Corvette.
This is no ordinary C4 coupe, but a GM Engineering test mule with VIN plate EX4607 proudly displayed in the windscreen, built in 1986 to test all the new-for-1988 features. This actual car must have spent weeks pounding round the General Motors Proving Ground at Milford, Michigan with longer runs on the road, testing all the changes for a year which saw the C4 suspension, steering and brakes vastly improved.
Based on the Corvette Z06, this new GTR also represents a collaboration between Specter Werkes and Lingenfelter Performance Engineering, with a Lingenfelter twin-turbo system powering the car – and pumping its 7.0-liter LS7 engine to 800 horsepower. Featuring dramatic bodywork and carbon fiber details, the GTR blends racing-inspired design cues with uncompromising luxury and performance.