Porsche introduced the 964-based Carrera Cup in 1990 as a single-model “Spec-racer” championship to replace the successful 944 Cup series. Based on the Porsche 964, the 964 Cup was the 1990 racing version for this new Carrera Cup championship. In addition to an increase in output by 11 kW to 195 kW (265 hp) the 964 Cup had a welded Wilfried Matter roll-cage, a single Recaro race seat with six point safety harness and a fire-suppression system. The suspension was stiffened with shorter springs, Bilstein gas-filled shocks and fully adjustable anti-roll bars front and rear, a modified chassis set-up and the ground clearance was 55 mm lower than on the standard version. To reduce weight: the interior and the sound-proofing material was removed. The gear ratios were modified and it had non power-steering with a faster ratio, a catalytic converter and an anti-lock braking system (ABS). In 1992, the 964 Cup had a major revision whereby it now had the body from the 964 RS and the engine produced 202 kW (275 hp). Another major change was that the ABS could be switched off in the event of emergency braking or whilst the car was going backwards. The car now had 18 inch magnesium rims which replaced the aluminium rims and the car was lowered by a further 20 mm. The normally aspirated air-cooled six-cylinder engines were selected by factory race engineers for equal output. They ran without air filters, the stock dual-mass flywheel was replaced with a single disc, and the electronic engine control units sealed to prevent tampering.
The Carrera Cup race series was staged nationally, regionally, and then internationally, often running as support events for Formula 1. They proved quite popular and successful.
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