1977 934.5

History

One of ten cars built by Porsche in 1977 exclusively for the North American IMSA and Trans-Am Series. Chassis number 930-770-0958 was the eighth customer delivery and was campaigned by Canadian Ludwig Heimrath in both IMSA and Trans-Am. Heimrath won the 1977 Trans-Am Series championship after successfully protesting Peter Gregg for illegally using parts from a 935. The car was subsequently converted into a 935 and raced by Heimrath from 1978 to 1980. It was retired at the end of the 1980 season and parked in a warehouse in Toronto, Canada. Porschehaus acquired the bare chassis and a container of related bits and pieces in 1995. The car was rebuilt over a period of five years to the original factory specs as delivered to Heimrath. The car was test driven for the first time at the 2004 Mont-Tremblant Legend event. We plan to show this unique piece of racing history at select events in 2005. Please check this site from time-to-time for our racing schedule updates if you would like to see this concours level restoration in real life.

Technical

Engine

• code 930-73
• 3 liter 95 mm bore 70.4 mm stroke
• 590 hp at 7,500 rpm and 1.2 bar boost
• 6.5 to 1.0 compression ratio
• mechanical fuel injection
• single ignition
• solid motor mounts
• two intercooler radiators behind front bumper
• forward mounted oil cooler
• 20 liter oil tank in front trunk

Clutch

• mechanical cable activated
• solid disc racing
• diaphragm pressure plate

• 930 4-speed
• limited-slip differential
• solid transmission mounts

• chrome moly roll cage
• 100 liter fuel cell
• Sparco racing drivers seat
• Sparco 6 point competition harness
• two cable activated afff (aqueous film forming foam)
  fire extinguishers
• fiberglass front hood and rear lid/wing

• Bilstein racing coil type shocks front and rear
• adjustable front and rear sway-bars
• factory front tower stress-bar
• factory adjustable front and rear spring plates
• solid suspension bushings throughout