Street Version Engine Specifications

The engine in the Carrera RS and the Carrera Cup USA is a "blueprinted" version of the Carrera 2 engine. Pistons and cylinders are selected to optimize power output and minimize variation in output between engines. A sports flywheel, seven kilograms (15.4 lbs.) lighter than the Dual Mass unit is fitted. The drive belt system is simplified from two belts to one belt and the fan belt monitor is eliminated, the alternator light now serving this purpose. Engine mounts of the Carrera RS and Cup USA are changed to a solid rubber design. The suction oil line from the oil tank to the engine is flattened to improve rear tire clearance. The power steering pump drive is eliminated as on the RS America. The Carrera RS and Cup USA have a remapped DME chip that has more aggressive timing advance characteristics and thus produces ten more horsepower. Because of this the RS requires a Research Octane Number (RON) + Motor Octane Number (MON) /2 fuel of:  98+88/2 =93 octane gas. The standard Carrera engine requires a 95+85/2=90 octane fuel.

The 29 Carrera Cup USA engines that were dynamometer tested at Andial/PMNA did not vary more than 1.5 horsepower from 275 SAE in race trim with no mufflers and a modified air cleaner on 92-octane gas. Porsche reported on delivery to Andial/PMNA that seven of the Carrera Cup engines had cam timing within spec, but settings not identical to the other 38 cars; these seven engines were corrected at Andial/PMNA. Andial/PMNA preformed no other engine modifications other than sealing them to make tampering impossible.

 

Single belt fan drive and lack of air conditioner mount is all that distinguishes the Cup engine from a normal Carrera 2