Porsche 934/5

Porsche 934/5
Overview
Manufacturer	Porsche AG
Production	1977
Assembly	Germany: Stuttgart
Body and chassis
Class	Group 4 racecar
Body style	2-door coupé
Layout	RR layout
Related	Porsche 930, 934, 935
Powertrain
Engine	Turbocharged 3.0L Flat-six
Transmission	4 speed manual gearbox
Dimensions
Wheelbase	2271mm x 1502mm x 1508mm
Length	4128 mm / 162.5 in
Width	1651 mm / 65.0 in
Height	1321 mm / 52.0 in
Curb weight	1984lbs (899,93kg)

The Porsche 934/5 is a racing car that was designed as a hybrid of the Porsche 934 and Porsche 935 to compete in Group 4 of the IMSA.^[1]

The Porsche 934/5 was assembled from 10 samples of Porsche 934 and Porsche 935, by incorporating the Chassis and engine of the 934 with the wheels, tires and rear wing configuration of the 935, creating the new 934/5.^[2] The goal for the new design was to compete in the Group 4 racing competition of the IMSA (International Motor Sport Association) in 1977. On January 22, 1977, Peter Gregg and Brumos crew team flew to Germany, in order to acquire the resources necessary for this new car under construction to be assembled. Gregg and his team decided to fit the 934 with the 935's rear wing and to add a turbocharger, so that they could compete with the other racing cars, such as the more powerful DeKon Monzas. The name has been carefully selected and origins from the Porsche 911 Turbo (code-named 930). The "4" in the name comes from the fact that the 934/5 was built to compete in the Group 4 of the IMSA.^[3]

For the design of the Porsche 934/5, Porsche was strongly inspired by its previous models. The basis for design has been influenced by the Porsche 934. However, Peter Gregg and his team made the decision to fit the newly designed car with the large rear spoiler, the widened body work and the big fenders from the composition of the Porsche 935. The widened body work was required for the large rear wheels to fit. The result of the mixture between the 934 and 935 is a prototype-looking car, ready to dominate the racing tracks, which it was designed for.^[3]

The Porsche 934/5 did not participate in many races, since the IMSA banned the 934/5 before it could compete in its first race. Due to this ban, the designers decided to enroll their machine in the rival SCAA Trans Am Series, in which the Porsche participated and won 6 out of the 8 races. These victories would mean that the 934/5 would be the 1977 champion, however, due to a formal protest against the 934/5 by Ludwig Heimrath, the officials declared Ludwig and his Porsche 934 champions of 1977.^[3]

– Source:^[4]

The creation of this car has been made possible by a change in rules. In the 1977, the IMSA had implemented a rule that allowed Porsche racers to add a single turbocharger to their cars, to increase their competitiveness versus the rival race cars which featured more horsepowers. As a result, a 3 Liter Flat-six engine (also referred as the boxer engine), fitted with a single KKK turbocharger, that could generate 590 bhp, and go 0 to 60 in 5.6 seconds was created for the 934/5 . The car also sported huge rear wheels, which made it a tough job to drive the car correctly, especially at high speeds.^[5]

Due to the fact that Porsche only built 10 of the 934/5, the price to pay in order to purchase one can vary. These prices are established at auctions. For the last known sales figures of the 934/5, the Gooding Amelia Auction has auctioned one of the ten models for $1,375,000.^[6]

The Porsche 934/5 has its own Hot Wheels model, which is based on the classic colors in which the car raced in the 1970s.^[7]

• International Motor Sport Association
• Official Porsche Website
• Petrolicious
• Sports Car Club of America
• Trans Am Series
• The perfect 1977 Peter Gregg Porsche 9345