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This custom Speedster is based on a 1978 Porsche 911SC Targa and was a long-term project for its owner and builder, who began the project in 1994 and applied the finishing touches in 2018. Power is from a Rothsport-tuned 3.6-liter flat-six paired with a close-ratio, magnesium-case five-speed 915 manual transaxle that reportedly features a Quaife limited-slip differential. Additional modifications include a short windscreen and modified rear hardshell cover from a 964 Speedster, 993-style fenders and headlights, custom rotary-forged 18″ aluminum wheels, four-piston Brembo brakes, ERP Coilover suspension, fixed-back seats, a smoothed and gusseted six-point roll cage, and more. This 911SC was featured in a 2013 issue of Excellence
The Targa was dismantled for body modifications in the mid-1990s. Custom steel front fenders combine upper portions from a 993 with the narrower arches of the original 911SC versions, and blend into extended and smoothed lower rockers. The cowl vent and one wiper hole were eliminated, the trunk lid was smoothed, and a recessed Porsche crest was added to the hood. The front valance is a custom fiberglass item based on that used on the RUF CTR, while the single-outlet rear cover was designed and fabricated by the current owner. The car is not equipped with a soft top.
The windshield and frame were reportedly sourced from a 1989 Speedster and paired with a modified 911SC cowl, and the curved plexiglass side windows were custom-made. The hardshell rear tonneau cover is a modified item from a 964 Speedster, while the ducktail engine cover is reportedly an original piece from a 1974 Carrera. Both are supported by brushed stainless steel gas struts. Split-panel convex mirrors were acquired from Strosek Design. Fuchs-style 18″ wheels were rotary-forged to the owners design and wear Michelin Pilot Super Sport tires measuring 225/40 upfront and 255/35 out back.
The 3.6-liter flat-six was reportedly sourced from a 19k-mile 964 RS America (62N06606) and was tuned and installed by Rothsport Racing. Modifications are said to include a two-stage resonance intake manifold, Rothsport 48mm individual throttle bodies, Rothsport intake splitter, a Split Second MAF sensor, 993 E-coils, 964RS camshafts, custom silver-finished tin, a Rennline RSR-style mount bracket, Rennline RSR-style rear motor brace in satin-finish stainless steel, a GHL exhaust system with a two-into-one muffler, a Patrick Motorsports lightweight aluminum flywheel, and a replacement wiring harness connecting the engine to a MoTeC engine management system under the rear cover. A complete build list provided by the seller is included in the gallery
The seller reports that the engine was dynoed and tuned by Scott Platt and Jeff Gamroth of Rothsport, and a 2017 dyno chart shows peak output of 290.3 horsepower at 6,010 rpm and 260.3 lb-ft of torque at 5,604 rpm, both measured at the crank.
The 915 transaxle was sourced from a 1977 911S, the last year to offer the lighter weight magnesium case, and features a stock first gear with close-ratio Porsche racing gears from 2-5 culminating in a 0.89 5th gear. The seller reports that the transmission was built by Gordon Ledbetter of Hillsboro, Oregon and also features and a torque-sensing Quaife limited-slip differential and further modifications detailed on an included modification list. The factory torsion bars have been replaced with coilovers with JRZ dampers and Eibach springs, while other modifications include an ERP alloy crossmember, reinforcement of the rear crossmember, 935-style spring plates, and 20mm anti-roll bars. Braking is handled by four-piston Brembo GT calipers with cross-drilled front rotors and 930 rear discs with factory parking brake drums.
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