In 1970, the revised Porsche 917 dominated, and the GT40 had become obsolete.

To fix the problems, Porsche released a revised 924 Turbo series 2 ( although badging still read 924 Turbo ) in 1979.

In addition, Porsche installed manually adjustable lightweight Recaro racing seats rather than the standard power-operated leather buckets ( also manufactured by Recaro ), a revised suspension system optimized and lowered by 20 mm for possible track use, 17-inch wheels ( also slightly wider to accommodate wider tyres ) rather than the 16-inch as found on the Coupe and wider tires, 225 front and 255 rears rather than 205 and 245 respectively.

Porsche departed from the 964's setup consisting of three differentials and revised the system based on the layout from its 959 supercar, replacing the centre differential with a viscous coupling unit.

The front end of the car was revised including new bodywork which featured headlamps that previewed the all-new 2nd generation ( 996 ) Porsche 911 which would appear in 1997.

1952 Porsche 356 K / 9-1 Prototype In post-war Germany, parts were generally in short supply, so the 356 automobile used components from the Volkswagen Beetle, including its internal combustion engine, transmission, and suspension.

With the no frills approach meaning less weight, as well as the optimising of the suspension, Porsche could focus media attention on the Club Sport variants fast road and track abilities.

While the 356's body was an original design by Porsche employee Erwin Komenda, its mechanicals ( including engine, suspension and chassis ) were derived from the Volkswagen.

Porsche already preferred the flat-four engine, and selected a swing axle rear suspension ( invented by Edmund Rumpler ), while Zündapp insisted on a water-cooled five-cylinder radial engine.

The Porsche suspension were later used on a few of the later Jagdtiger tank hunters.

Similar to designs of European cars such as Porsche, Volkswagen, Mercedes-Benz and others it used coil springs at all four wheels with independent rear suspension arms incorporated at the rear.

None of the issues Nader raised were problems among owners of the Porsche 911, which had the same layout and similar suspension, nor with the less powerful Volkswagen Type 1 Beetle.

Journalist David E. Davis, in a 2009 article in Automobile Magazine, noted that despite Nader's claim that swing-axle rear suspension were dangerous, Porsche, Mercedes-Benz, and Volkswagen all used similar swing-axle concepts during that era.

The 718 was a development of the already successful Porsche 550A with improvements being made to the body work and suspension.

The Porsche 904 rode on coil springs ( the first Porsche not to use trailing arm front and swingaxle rear suspension ), with unequal-length A-arms in front.

Yet, Formula One used lighter 13-inch wheels, and Porsche had already used Team Lotus suspension parts in earlier years.

Porsche used torsion bar suspension for their 911 series from 1963 until 1989 with the introduction of the 964.

When developing the suspension system the facility of electro-hydraulic kinematics and compliance at Anthony Best Dynamics was employed to measure the performance of the suspension on a Jaguar XJR16, a Porsche 928S and a Honda NSX to use as references.

The Porsche Carrera GT's carbon-ceramic ( silicon carbide ) disc brakeNotable technology includes a pure carbon fiber monocoque and subframe, dry sump lubrication and inboard suspension.

The Weissach axle ( pronounced ' Vise -' as in ' advise ' and '- ach ' with guttural ' ch ') is a special rear suspension arrangement devised for the Porsche 928.

Toyota engineers ( including Dr Kumabe ) had visited Germany before World War II and had studied Porsche and Volkswagen designs ( independent suspension, aerodynamic bodies, backbone chassis, rear-mounted air-cooled engines, economical production cost ).

In circuit racing, the new car was very hard to master, though, due to the swing axle rear suspension design initially adopted by Porsche ( relatively advanced for its day, it is now utterly obsolete because of its many problems ).

The longest surviving flat-six-engined model, the Porsche 911, is a rear-engined sports car with acceptably compromised interior room and a long history of suspension development to utilize the characteristics of the drivetrain layout.

As a suspension or steering failure was suspected, the BMW team with Hubert Hahne and Dieter Quester withdrew from the race, as did Mitter's teammate at Porsche, Hans Herrmann.

These problems were evident on the Mercedes-Benz 190SL and 300SL, Porsche 356, Triumph Herald, Vitesse and Spitfire, Tatra T603, Renault Dauphine, Volkswagen Beetle ( until rear suspension modifications, c. 1967 ) and others.

Aftermarket roll-inducing springs from the likes of SCAT, also called camber compensators, are available for Porsche, VW and early Corvairs, which reduce oversteering tendencies at the cost of increasing suspension harshness.

Porsche updated the North American 928 S for 1985, replacing the 4. 7 L SOHC engine with a new 5. 0 L DOHC unit sporting four valves per cylinder and producing 288 hp ( 215 kW / 292 PS ).

The Porsche 993 is the company's internal name for the version of the Porsche 911 model manufactured and sold between late 1993 and early 1998, replacing the 964.

Among the most popular privately-built 962s was that from Kremer Racing, termed the 962CK6, which did away with the original aluminium sheet tub of the original Porsche chassis, replacing it instead with a carbon fibre tub.

A few cars, notably the Alfa Romeo Alfetta, Porsche 924, and Chevrolet Corvette ( since 1997 ), sought a more even weight distribution between front and back by placing the weight of the transmission at the rear of the car, combined with the rear axle to form a transaxle.

Porsche 928 S4 rear

Having the engine, transmission, catalytic converter ( s ) and exhaust all cramped into a small rear engine bay made emission and noise control more difficult, something Porsche was already facing problems with on the 911 and wanted to avoid.

Porsche utilized a transaxle in the 928 to help achieve 50 / 50 front / rear weight distribution, aiding the car's balance.

Porsche 928 GTS rear quarter view

The front-engine, rear wheel drive arrangement was normal for most other manufacturers, but it was unusual for Porsche having previously only used mid-or rear-mounted engines of a boxer configuration, all of which had been air-cooled.

Porsche chose a rear wheel drive layout and a rear-mounted transaxle for the design to help provide 48 / 52 front / rear weight distribution ; this slight rear weight bias aided both traction and brake balance.

Production of the Targa, complete with removable roof and heavy transparent plastic rear windows openable with a zipper ( later called ' Version I ' by Porsche and the ' soft-window Targa ' by enthusiasts ), commenced in December 1966 as a 1967 model.

In January 1968, Porsche also made available a Targa ' Version II ' option (' hard window Targa ') with fixed glass rear window, transforming the Targa into a coupe with removable roof.

Porsche's sport coupes which were originally based on Volkswagen parts and platforms continue to use the classic rear engine layout ( which later became water-cooled ) in the Porsche 911 series, which remains competitive in the second decade of the 21st century.

VAZ 21099 4-dr saloon, rear view Despite NAMI ( National Automobile Institute ) having allowed the involvement of Porsche engineers in the engine development, the Samara never achieved the same success as the Riva, even though it did prove to be a robust car with a modern style and an initially competitive price.

The motor's distributed weight across the wheels, in a Porsche 911, provides excellent traction, but the significant mass behind the rear wheels makes it more prone to oversteer in some situations.

File: Box0706 1. jpg | Porsche Boxster, a rear mid-engine, rear-wheel ( RMR ) drive sports car

Cars such as the four-cylinder Volkswagen Beetle and the six-cylinder Porsche 911 use a flat-engine at the rear of the car, where its extra width does not interfere with the steering of the front wheels and there is a weight-saving since no prop-shaft is required.

In some cases ( e. g. Lancia Delta Integrale, Porsche 964 Carrera 4 of 1989 ) the centre differential is an epicyclic differential ( see below ) to divide the torque asymmetrically, but at a fixed rate between the front and rear axle.

Journalist David E. Davis, in a 2009 article in Automobile Magazine, criticized Nader for purportedly focusing on the Corvair while ignoring other contemporary vehicles with swing-axle rear suspensions, including cars from Porsche, Mercedes-Benz and Volkswagen, notwithstanding the fact that Nader's Center for Auto Safety had published a book critical of the Beetle.