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The Porsche 934 was a specially prepared racing version of the Porsche 911 Turbo built to satisfy the FIA Group 4 rules and to continue the marque's success in that class. Homologation requirements stated at least 400 road-going cars were to be built within a two year period. The dimensions of the road and race cars were to be equal and modifications throughout were to be limited, except for safety. A roll cage, fuel cell, and other common racing safety features were required. These restrictions made the class very competitive; the limitation of displacement and weight made competition even more fierce. The allowable limit of displacement size was directly tied to the vehicles overall weight. The more weight, the higher the displacement allowed; the lower the weight, the less displacement permitted.
Porsche introduced the new 930 model in 1975. This 911 Turbo Type 930 would serve as the basis for the new Group 4 racer, which would be dubbed the Type 934. During the development of the 930, the needs of the 934 were taken into consideration and planned appropriately. To satisfy the rules stating 'limited modifications', Porsche gave the 930 much strong and better components than needed, thus having it included on the 934. For example, components on the transmission were designed to handle the rigorous 485 horsepower from the Type 934 engine, making it under-utilized for the 290 horsepower Type 930.
The Type 934 was fitted with a turbocharger which helped the engine achieve over 480 horsepower. In 1977 the valves were enlarged and horsepower grew to over 550. To satisfy the 1120 kg rule, the interior was stripped many non-essential items. Major modifications were not allowed, which meant the electric windows remained in tact.
In both the European GT Championship and the TransAm Championship, the Porsche 934 was a dominant force. The highlights were from 1977 through 1979 when it captured three successive class victories at the legendary 24 Hours of LeMans.
Porsche introduced the new 930 model in 1975. This 911 Turbo Type 930 would serve as the basis for the new Group 4 racer, which would be dubbed the Type 934. During the development of the 930, the needs of the 934 were taken into consideration and planned appropriately. To satisfy the rules stating 'limited modifications', Porsche gave the 930 much strong and better components than needed, thus having it included on the 934. For example, components on the transmission were designed to handle the rigorous 485 horsepower from the Type 934 engine, making it under-utilized for the 290 horsepower Type 930.
The Type 934 was fitted with a turbocharger which helped the engine achieve over 480 horsepower. In 1977 the valves were enlarged and horsepower grew to over 550. To satisfy the 1120 kg rule, the interior was stripped many non-essential items. Major modifications were not allowed, which meant the electric windows remained in tact.
In both the European GT Championship and the TransAm Championship, the Porsche 934 was a dominant force. The highlights were from 1977 through 1979 when it captured three successive class victories at the legendary 24 Hours of LeMans.
| Trans-Am SeriesThe 'Trans-American Sedan' pro series debuted on March 25th of 1966 as a four-hour prequel to the Sebring 12-hour enduro. It was a series intended for the pony cars such as the Mustang, Plymouth Barracuda, and a slew of small-bore Eurosedan cars that were athletically inclined and could handle the rigors of left and right 'road' racing courses. The following year, in 1967, the competition between the ponycars escalated even further, with GM debuting their Camaro, and Pontiac their Firebird. A Mustang based Mercury Cougar and a new Plymouth Barracuda provided plenty of competition to a very full field. Most major automakers provided factory support and attracted some of the biggest names in racing; the number of races in the series rose from seven to twelve. By the 1969 season, the TransAm Series attracted over 224,000 spectators to 13 events. Factory support continued to increase and so did the competition. The sport prospered until the beginning of the 1970s, as new safety concerns, government regulations, an impending oil embargo, and expensive emissions were detrimental to the industry. The cost to build a competitive racer increased significantly. Most automakers backed out of competition, which meant a serious lack of resources and big name drivers. The glory years of the series were over, but much was still to come. Trans-Am Rules 1966-1972 The TRANS-AM Championship is now over 30 years old on the sixth major rules format. The latest format began in 1980 and continues without major revisions today. Rules for 1966-1972 are as follows: The series was born in 1966 with a two-class structure. Over and Under Two Liters. The 0-2 (305 cubic-inch) class was for American built 'pony cars' - while European sports sedans were in the U-2 class. O-2 cars had maximum wheelbase of 116 inches, a minimum weight of 2,800 pounds and a maximum wheel width of eight inches. Both classes were based on FIA Group 1 and 2. 1970 through 1972 The series had its first 'single class' format during these years. The small European sedans were split into their own series in 1980 leaving the American-built pony cars in a single class. The five-liter maximum (305 cubic-inch) displacement was retained while a 3,200 minimum weight was in effect. |
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Monterey Historic Automobile Races at Laguna Seca |
 2006 Amelia Island Concours d'Elegance |
2005 50TH Annual Porsche Parade. Hershey Pennsylvania |
1977 Porsche 934.5 |
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| Year | 1977 |
| Make | Porsche |
| Model | 934.5 |
| Body Style | Coupe |
| Engine Location | Rear |
| Drive Type | Rear Wheel |
| Production Years for Series | 1975 - 1977 |
| Weight | 2350 lbs | 1066 kg |
| Combined MPG | 0.00 |
| Chassis / Engine Numbers Shown | |
| Chassis Number | 930 770 0958 |
| Engine | |
| Engine Configuration | O |
| Cylinders | 6 |
| Aspiration/Induction | Normal |
| Two intercooler radiators behind front bumper | |
| Displacement | 3.00 L | 183.1 cu in. | 3001 cc. |
| Horsepower | 590.00 BHP (434.2 KW) @ 7500.00 RPM |
| HP to Weight Ratio | 4.0 LB / HP (Vehicles with similar ratio) |
| HP / Liter | 196.7 BHP / Liter |
| Compression Ratio | 6.5:1 |
| Fuel Type | Gasoline - Petrol |
| Fuel Feed | Fuel Injected |
| Mechanical Fuel Injection | |
| Vehicles with similar horsepower and weight | |
| Standard Transmission | |
| Gears | 4 |
| Transmission | Manual |
| Limited-slip differential | |
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| Monterey Historic Automobile Races at Laguna Seca |
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This is the true 1977 SCCA Trans Am championship winner with a total of 8 wins that year
Replies: 1 Wednesday, April 12, 2006 |
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