The Porsche 935 differed not much, in the beginning, from the standard Carrera RSR. A new whale-tail wing, a new four-speed transaxle, the 935 inherited very much of the Porsche Carrera Turbo philosophy. It featured the same coilover suspension, a full cockpit rollcage and a separate X-member stiffing frame that fitted between the inner front bodyshell sheet metal. The two components were made from aluminium alloy. The cars sported too the ventilated, cross-drilled disc brakes from the legendary 917 car. The wheels were 16 inches in diameter with a 12,5 inches width in front and 19 inches in diameter with 15 inches width in the rear. The engine horsepower was supposed to deliver some 650hpn which seemed, according to many, under the truth. It was probably much closer to the 750hp. A dual ignition system and its air-to-air intercooler were installed on the car. The 935-77 car roof was flatter than that of the other 911 based cars. Thus it improved the air flow, and the rear wing efficiency. The cars with single turbo dominated the Championship.
A Porsche 935.77 entered by Vasek Polak at Mid Ohio in 1977
Copyright Mark Windecker
Porsche 935.77
Cars were identical to the Factory 1976 cars. Basic drive train, four-speed gearbox and fhe 2,9L turbo engine. The water-based cooler system had been improved for a better efficiency. It had been moved to the rear of the engine comparrment. The rear bulkhead had been moved forward by 200mm. The floor pan of the passenger compartment had been raised by three inches. The 935.77 roof wzs flatter than that of the other 911 based cars. This was meant to improve aerodynamics. The rear wing could be more efficient. The front suspension featured improved geometry and lighter McPherson-type strut units. The adjustable anti-roll bar was moved to the front while the rear suspension remained unchanged. The engine received a twin KKK turbocharger, giving a slight power increase, but reducing turbo lag. The tail section was a new piece that fitted over the original body and rear window.
The 935.78 sported an inverted transmission, which proved quite effective on the Works car. Customer cars were powered by twin turbo versions of the powerplant.
The Interscope entered car was a single turbo version of the 935 in 1979
Copyright Mark Windecker
However, the rules for 1979 were modified in order to slow them. Therefore, single turbo versions of the 935 were introduced, with less weight to carry. Peter Gregg became the 1979 Champion with such a car. However, in Europe, the Kremer brothers had introduced the K3, a Porsche 935 fitted with a more radical bodywork. A similar car won the pestigious 24 Hours of Le Mans with Klaus Ludwig driving. He was partnered by brothers Bill and Don Whittington. The two brothers purchased the car and introduced it in the middle of the 1979 season. This car featured a flatter fiberglass roof as well as the deep wing fences to better control the air flow over them. One of the biggest improvement was the use of an air to air intercooler, keeping temperatures at a lower level. The power was more usable and for longer periods. An overall stiffening of the structure, achieved by aluminium tubing from the rollcage to each of the suspension points. Engine removal was much easier, and this was due to the rear crossmember, now replaced by two aluminium tubes bolted in place. A 3,2L engine was used in shorter events and it could give 800hp. Fences ran the length of the front and rear fenders. The air could flow over the top of the car to the rear intakes and spoilers. The rear window was covered with a roof extension containing another window and serving as a mount for the spoiler.
The Joest 935J car won overall at Daytona in 1980, the car was later sold to Gianpiero Moretti
Copyright Wayne Ellwood
In 1980, the K3 cars were widely spread and many cars were to be seen. From complete cars to conversion kits or bodt parts, K3s became the standard. Dick Barbour had purchased three cars, including John Fitzpatrick's one, who clinched the Championship.
The 935K3-80 apeared later, with new improvements. The rear suspension pickups were revised. The injection was now from Kugelfisher with a new induction system with larger inlets. Fences had been added to the sides of the engine cover/rear window and this car became one of the most successful in history.
Reinhold Joest had built personal versions of the 935. They were called 935Js. These cars featured 935-77 bodywork and a space frame engine compartment similar to the 935 Baby. The air to air intercooler was housed between the engine and bulkhead. The front bodywork was slightly altered. Lower profile fenders would produce a smaller frontal area and small fences on all four fenders and louvres over the front wheels. Such a car won at Daytona with Reinhold Joest, Volkert Merl and Rolf Stommelen driving. They did not win any other race in the year until the Daytona Finale, where Gianpiero Moretti won with Reinhold Joest. The Italian had purchased the car which sported the famous Momo colours.
The Bayside Disposal team, owned by Bruce Leven, had purchased the car previously owned by Peter Gregg. They had a very difficult season. The cars, which were updated, were old cars and the season ended with no success and the death of their driver-star Peter Gregg, who had experienced vision troubles and commited suicide.
In 1981, new cars appeared. The first one was the Andial built car. Run by German expatriates Alwin Springer, Arnold Wagner and Dieter Inzenhofer, the Santa Ana shop had built a special car. It was a 1978 car which had been thoroughly modified. The nose and rear fenders were longer and edged with fences and the rear spoiler incorporated side panels which were very wide. A bigger wing made this car look quite different from the other cars. Powered by a special homebuilt 3,2L, it was extremely fast.
Rolf Stommelen and Harald Grohs drove this Andial built Porsche 935 to two wins at the end of the 1981 season. Here, they take the Road America victory.
Copyright Mark Windecker
While very fast, this car proved much unreliable. Rolf Stommelen and Harald Grohs had a couple of dnfs. Then the car disappeared to be heavily improved. When the car reappeared, it was to produce back to back wins at Mosport and Road America.
More radical were the Joest built Moby Dick replicas. Purchased by Gianpiero Moretti and John Fitzpatrick, they would have different fates. While the car proved fast, it would never win in the hands of Gianpiero Moretti , partnered by Jochen Mass, Jim Busby or Bobby Rahal in 1981. It would not be seen in 1982, except in Europe, but was back in 1983, with the Kreepy Krauly support, brought along by talented driver Sarel van der Merwe. The doors were different from the original Works car.
Gianpiero Moretti ran a Moby Dick Joest replica, the JR001, in 1981. He is seen here at Sears Point.
Copyright Van Zannis
JLP Racing had entered their personal idea of the K3, they had modified themselves the car with a Kremer built engine and some parts. Called the JLP2, it still bore a resemblance with the K3, but the cars would then evolve with time. The JLP3 would appear in 1981, which was built by Chuck Gaa in Atlanta. It featured a space frame construction chassis with a high floor sill and the underside area was used as a ground effect wing section. The body shell was still based on K3 parts. A large rear wing was mounted on the back of the standard window/engine cover flanked by two slightly modified rear fenders. The extreme front of the K3 nose was lowered. It would be lowered further later! The doors featured fairings running out of the rear fenders.
The Bayside Disposal Racing had their own evolution of the 935 bodywork. It had standard 935-77 type rear engine cover and nose sections. The tail section had been modified and featured distinctive flip out flay sections on top. They won at Sebring with Hurley Haywood and Al Holbert but it was their sole 1981 victory.
John Fitzpatrick had set up his own team in 1981, after Dick Barbour's financial setbacks forced him to retire from racing. He had one the latest K3-80, he would have to modify his car, after experiencing efficiency problems. He incorporated small ground effect tunnels behind the rear wheels, which proved efficient as speed was improved.
Bob Akin had a standard K3 in 1981, but he entered a more radical car, called the L1, in 1982. It was some kind of hybrid as the chassis was a complete aluminium monocoque with the motor supported on two side braces. The front section of the car was mated to a Lola T600 nose section. The roof line and engine were the only original parts. According to Derek Bell, who drove the car on some occasions, it was the worst car he had ever driven. The car was eventually destroyed at the Daytona Finale, and was never raced again.
Bob Akin's radical Porsche 935L1 proved fast but quite unreliable. It was
destroyed at the end of the season.
Copyright Mark Windecker
John Fitzpatrick had a new K4 in 1982. The car was based on the Moby Dick car, but it featured some differences. The chassis was constructed as a complete aluminium tubing space frame. It used a wider front track, and the under body featured ground effect tunnels. These tunnels were concealed by full body width, upward slanted, slats at the back. The front fenders were even wider and the font spoiler more swept back. Rear fenders were a one piece unit incorporating the rear wing on one central mounting and a secondary rear window. Large section sills joined front fenders to rear and an outlet duct for the front radiator situated on the front lid, and full width doors. Max Crawford re-engineered the Porsche K4 for John Fitzpatrick Racing.
John Fitzpatrick entered a Porsche 935K4 in 1982, winning four races, but not the title.
Copyright Dave Kutz
The powerplant was a 3,2L twin turbocharged engine with an air to air intercooler. He would eventually win four races with this car. Later in the season, he would race the JR002, which was the second Joest Moby Dick replica. The car would wind up an excellent fourth overall at the Le Mans race, behind the three Works Porsche 956s.
JLP Racing entered the JLP4 in 1982, which was more radical. This car was designed by Lee Dykstra and built by Dave Klym. It featured a space frame chassis, but the front suspension was altered to a pure race car type. The springs and shocks were incorporated inboard, which allowed a clean airflow to the full length ground effect Venturis beneath the car. The car was now a right hand drive. The bodywork was completely reshaped, with slab sides and a low nose with no front bib spoiler. This car was mainly aimed at the shorter event races, while the JLP3 was used for the endurance races. John Paul Jr won at Brainerd and Portland with JLP4. However, the car was finally destroyed in a test driving session at Road Atlanta, when the rear wing took off. The Pauls father and son finished the season with JLP3, and Jr easily won the 1982 crown.
John Paul Jr drove this JLP3 car after the JLP4 was destroyed in a test session
Copyright Mark Windecker
Interscope Racing had a pair of K3s and two K4s, but these ones were never actually used by the team. They concentrated on their newly acquired Lola T600s.
The old JLP2 was run by Mark Speer and Terry Wolters, with little success though. The Bayside Disposal Racing entered some selected events with a slightly evolving car.
Charles Ivey Racing entered some races with a standard K3 car.
Preston Henn supported several cars during the season, but the most impressive one was undoubtedly the Andial built car. This was some kind of Moby Dick replica but had a lowered space frame chassis, wider front track and a long tail body with full width door panels. The tail section was a single moulding aft of the rear wheel arches incorporating the rear window. This section was hinged at the top of the window to tilt up for maintenance. The rear end was completely open. Al Holbert and Harald Grohs powered this car to an impressive second overall at Riverside. Later it would reappear at the end of the season in the hands of different drivers, but its greatest achievement would take place the following year when winning the 24 Hours of Daytona with Bob Wollek, Claude Ballot Léna, AJ Foyt and Preston Henn driving.
In 1983, the IMSA series was the only Championship where you could find 935s running, and still running strong!
Bob Akin had switched back to his old faithful K3 for most of the season, but at the Daytona Finale, he had a new car, the 935-84. This car had a wider front track, a Kremer K4 front end, wide doors and a special tail which was something between the K3 and the K4. The rear window/engine cover piece had a reduced height and an open tail end fitted with full width upward swept slats.
The John Fitpatrick K4 won at Riverside but this event was marred by Rolf Stommelen's death. He was driving the JR002 car which was written off in the process.
The Bayside Disposal team entered a car that displayed a lowered tube frame chassis, wide front track and fenders and most of all, a distinctive tail section.
Gianpiero Moretti entered JR001 alternatively with the March 83G Porsche, with some consistent results, but no win.
In 1984, some of the 935s were still running, but it would be difficult for these cars to be as efficient as they were, because of the now widely spread GTPs. The 962 was now available to the top teams and the 935s would be sold to less efficient ones. However, the beginning of the season brought its share of good surprises when Preston Henn's faithful Andial built 935L nearly won the 24 Hours of Daytona. AJ Foyt, Bob Wollek and Derek Bell took a strong second behind the winning March Porsche.
Preston Henn's faithful Andial built Porsche 935L finished second in 1984 at Daytona.
Copyright Mark Windecker
Sebring was still more upsetting with the overall win for a Joest built 935J. Stefan Johansson, Hans Heyer and Mauricio de Narvaez drove an outdated car to victory, just in front of Bob Akin 935-84.
The remainder of the season was to be a big fight between the Holbert Racing Porsche 962 and the Blue Thunder Racing March 84G Chevrolet, which eventually won. The 935s were no longer developed, and were to be seen in new liveries, according to their new owners sponsors.
Richard Silver and Joe Varde drove this Porsche 935K3 to an anonymous 17th at the 1985 Columbus 500.
Copyright Mark Windecker
The same could be said about the 1985 and 1986 seasons. Preston Henn still entered his old Porsche 935L, which would be driven by Bob Wollek, Don Whittington and Preston Henn, along with the new Porsche 962. Starting fourteenth, it was still able to run fast, but it was obviously the end of a glorious career. The car would no longer be entered in the season. Marty Hinze had acquired the JLP2 running under his yellow colors, and it started seventeenth. The Toyota Village car, with a special design, started twentieth and would not finish. It was probably the latest modified 935, with a special front end and a very high wing.
The Paul Goral entered car would simply run with the GTU cars! The days of the 935 were gone!
This fantastic machine would be seen for two last appearances in 1986, with some very anonymous results. Then, no car would be entered in the IMSA Championship. But they would simply be never forgotten, and they remain very popular today with a lot of fans and collectors still running them in Vintage races.
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