This 1975 Porsche 911 Carrera is a backdated example with wide fender flares that is powered by a rebuilt 3.4L flat-six from a 1978 Porsche 930 Turbo and modified with 98mm LN cylinders, 7.5:1 compression JE pistons, and a rebuilt K27 7200 turbocharger. Aftermarket parts provider Rennline commissioned the build, which features numerous cosmetic and mechanical upgrades from the American engineering firm. This 911 started out as one of the 395 US-market Carrera coupes built for 1975. In 2014, the body was stripped to bare metal and put on a rotisserie to begin the two-year project. The wide body is finished in a custom tint of Chalk gray over a black interior fitted with a Rennline RSR dashboard backdate kit. 116k miles are shown on the odometer of this 930-powered Carrera which is now offered by the selling dealer with a clean Oregon title.
Prior to refinishing, the narrow-body chassis was stripped to bare metal and placed on a rotisserie. Steel 930 fenders were further widened and the edges were smoothed with a dolly. The early front bumper was also widened and further modified for air flow to the center-mounted B&B oil cooler. The steel long hood was adapted to accommodate the center-fill gas cap. Lighting was converted to LED and HID Bi-Xenon headlights were fitted.
The composite rear bumper and ducktail were provided by Getty Design and the stainless steel trim and frames were polished. Staggered-width 16″ Fuchs wheels with an RSR-style finish are mounted with Kumho Ecsta tires.
Dubbed “Project 50 Shades of Grey,” Rennline documented to the project on their RennBlog, and the promotional video can be viewed above. The seller has made several additions to the suspension since acquiring the car from Rennline.
Widened sport seats from Vintage Seats are finished in black with perforated inserts. RS-style door panels feature a faux basketweave texture and retain the switches for the powered windows. A wool square-weave carpet is fitted and replaced the removed rear seats. Turbo-branded door sills are finished in matte black.
The dashboard is wrapped in leather and features the Rennline’s prototype RSR backdate kit. 930 gauges include the odometer which shows 116k miles, however true mileage is unknown. A Prototipo steering wheel is installed and a 917-style wood shift knob connects to a WEVO shifter. Heat is retained and controlled by early HVAC knobs and backplate. The radio has been removed and a 917-style key fits inside the Rennline ignition switch bezel. Other Rennline additions include: Rennline floorboards Rennline adjustable pedal set Rennline short shift kit Rennline shift linkage cover Rennline billet knobs
The aluminum M930 engine now displaces 3.4-liters thanks to 98mm LN cylinders and 7.5:1 compression JE pistons. 3,200 miles have been driven since Poudre Sports Cars in Colorado built the engine featuring a rebuilt K27 7200 turbocharger, ARP head studs and camshaft reground to 964 specifications. Upgrades include oil-pressure fed chain tensioners and Clewett spark plug wires. Bell Cores built the custom intercooler to fit under the ducktail engine lid and B&B exhaust headers with heat exchangers connect to a custom exhaust. Rennline additions to the engine bay include: Rennline motor mounts Rennline valve covers Rennline engine carrier Rennline alternator strap Rennline blower motor cover
Rennline transmission mounts and a customized transmission carrier hold the 4-speed 930/34 manual transaxle in place. Eisenbuds rebuilt the long-bell housing unit and only 300 miles have been added since. A new Patrick Motorsports RSR scalloped flywheel is equipped with a Kennedy Engineering ring gear. A fresh Kennedy Engineering organic clutch disc mates to the lightweight flywheel thanks to a Kennedy Engineering pressure plate.
A stripped trunk includes a center-fill gas tank, a Rennline RSR weld-on strut tower brace, and a custom wiring harness and fuse box. A Rennline smugglers box cover hides the power supply thanks to the Rennline battery relocation kit.
Sway-A-Way torsion bars are installed with Rennline HD spring plate bushings. Elephant Racing raised spindles with Von Shock coil overs are mounted with Rennline HD strut mounts. Elephant Racing spherical bushings are installed in front with Rennline decambered balljoints. Tarett Engineering provided the sway bars and drop links, while 930 tie rods upgrade the steering.
The Turbo parts continue to the brakes, where 930 calipers grip onto 930 rotors at all four corners. 930 trailing arms are also equipped with Rennline HD trailing arm bushings. A driving video can be seen below.