Finally, a taller fifth gear of 0.759:1 (rather than 0.785:1) pushed top speed higher. To handle any additional cooling needs, a larger oil cooler - likely left over from the racing program and similar to the eventual 3.2’s unit - was mounted in the right front fender. An upgraded fuel distributor was employed, while pistons and cylinders were sourced from Mahle. The compression ratio was increased from 8.6:1 to 9.5:1, which necessitated the use of premium grade fuel (98 RON ). This yielded 3122 cc with the stock 70.4-mm stroke. Sprenger’s team took the stock 930/03 engine seen in RoW SCs (930/09 for MY1980) and bored it from 95.0 to 97.0 mm, the same as the 3.3 Turbo motor. Production figures are uncertain, but an estimated 150 units were delivered to Porsche preferred customers, mostly in Germany.
Designated as 3.1 SC-Leistungsgesteigert or “increased power” this special package boasted 210 hp at 5,800 rpm and 206 lb-ft torque at 4,700 rpm, achieving 0-60 in a claimed 6.5 seconds with a top speed of 143 mph. This rare 911 variant is virtually unknown among Porsche enthusiasts since an option code never existed officially. Their goal? 210 hp - the same as the revered ’73 Carrera RS”. However, on this SC-based project, the work of his team flew almost entirely under the radar. Sprenger - the father of Bosch mechanical injection in Porsche’s road cars - would soon make another indelible mark on the 911 lineage with the Flachbau (Flat-nose) 930. Enter Rolf Sprenger and his Department of Special Requests at the Kundenzentrum (Customer Center). Seeing an opportunity to bridge the gap, Porsche quietly set to work on the company’s very first ‘factory tuning kit’ intended for road use. “Despite being ‘as near perfection as it can be,’ a fair chasm existed between the performance of the SC and its 930 big brother.
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