RSR-Style 1970 Porsche 911S Race Car

This 1970 Porsche 911S was manufactured in December 1969 and sold new in Germany before being brought to the US in 1975. The car was subsequently driven in SCCA/Team Continental autocross events and open track days. In 1977, Charlie Pratt made the car into a full-time racer and planned to homologate it for FIA competition. He obtained FIA documents and started the process, though the car sat until being purchased in 1988 by the current owner, Porsche specialist Gordon Ledbetter, who is also one of the original R-Gruppe members. The car was refinished in Signal Yellow and built to RSR specifications by Ledbetter, who then raced it along with his wife in the PCA, SCCA, and NASA over the past 30 years. The extensive documentation file includes a logbook dating back to 1976, and power comes from a freshly-rebuilt full race build 3.0-liter injected flat-six mated to a rebuilt full race build 915 transaxle with custom gearing. The extensive chassis, suspension, and powertrain modifications are detailed below, and this 911 race car is now being offered on Ledbetter’s behalf by a dealer with a host of records, vintage photos, a 1977 Oregon license plate, and a clean Oregon title.

The body utilizes steel doors and a fiberglass hood, ducktail, and fenders. The rear fenders are removable according to the seller, and plastic side/rear windows are also installed. The seller has provided 220 photos in the gallery below, including up-close details of the exterior.

The competition-tuned suspension includes ERP Front A-arms, 934 upper strut mount bearings, Porsche 935 front strut assemblies, 450-pound front coils, late-930 Turbo front hubs, Charlie Bar front and rear sway bars, Porsche 935 rear trailing arms, Paul Newman-design rear spring plates, and Bilstein rear shock coilovers with 550-pound hyper coil springs. The chassis and roll cage were modified by Gatrell, including tubular reinforcements, a Turbo torsion tube, exterior reinforcements, inner pick-up point adjustments, 935-style front tubular bars, and custom rear shock pick-ups.

Braking up front is handled by 928 GTS calipers with Wrightwood Racing hats and Alcon AP rotors. In the back, a set of 944S front calipers are fitted along with RSR hats and 930 Turbo front rotors. A dual master cylinder and custom floor-mounted Tilton bias setup are also equipped. The 16″ BBS wheels in photos measure 9″ and 11″ in width, and another set of 18×9″ and 18×11″ BBS is also included.

The stripped-out interior features a Racers Group seat, 2018 FIA 5-point belts, an AMB transponder, up-to-date Halon fire system, factory oil pressure and oil temperature gauges, a transmission temperature gauge, fuel pressure gauges, an Autometer tachometer, and a Momo steering wheel. Additional pictures of the roll cage and other cabin details are provided in the gallery.

The front trunk compartment features additional bracing and a Fuel Safe 12-gallon fuel cell.

The RSR-spec 3.0-liter flat-six and RSR-spec 915 5-speed transaxle were built by Gordon Ledbetter. Many Porsche RSR parts were used during the process, and the seller has provided a list of current components below:

ENGINE:

• Fully detailed build sheet
• High-butterfly MFI injection
• RSR Spec MFI pump
• 3.0L SC case with 935 through bolts and shuffle pins\Turbo oil pump
• Delivar race hardware studs
• 935 knife-edged crankshaft
• Carrillo rods
• Mahle cylinders and RSR dome pistons
• Real 935 dual plug heads
• Elverude twin plug distributor
• Elverude hollow billet camshafts
• Real RSR solid rockers with lash caps
• AASE racing springs

TRANSMISSION / DRIVETRAIN:

• Fully detailed build sheet
• 8:31 RSR ring and pinion
• RSR spray bar
• WEVO internal modifications
• RSR transmission cooler pump with pin drive
• ZF Turbo 80% lock limited-slip differential
• Internal race modifications

The engine and transaxle were also rebuilt by Gordon Ledbetter. According to the seller, the engine only has a few hours on it, while the transaxle has zero hours since the rebuild. A dyno test from June 2013 is shown above, with maximum output of 304 horsepower around 7,500 rpm and 227 lb-ft of torque around 6,500 rpm. Several in-process engine/transmission rebuild pictures are provided.

A video showing the engine being dyno tested can be viewed above.

Additional undercarriage photos are displayed in the gallery below.

This 911S is being sold with a few photographs back to the 1970s, along with a logbook since 1976 plus additional factory and service documentation as shown in the gallery.