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Porsche 911 RSR 3.0

Porsche 911 3.0 Carrera RSR

In 1973, the world economic situation was rather complicated (similar to what we have today) due to the oil crisis. As it couldn´t be otherwise, the crisis had greatly affected to the global automotive sector.

Despite the difficult situation, that not helped sales of expensive cars and high consumption, Porsche not only continued working on new street models, but the racing department was a real hotbed of new models. The 911 accused the age of its original 1964 design and in Weissach was developing the new 911 model that would be introduced in 1974.

The racing department worked on the successful 1973 Carrera RSR 2.8 that evolved into the RSR prototype. The engine displacement increased from 2.8 up to 2993 cc and they got two different specifications, Typ 911/74 with 315 hp and Typ 911/75 with 330 cv. The body underwent several changes to improve aerodynamics and to accommodate a wider wheels. Thus, wheel arches were widened, especially the rear ones, and a wing was adapted to embrace the entire rear of the car. The car turned out to be a success and achieve the victory in the 24 Hours of Daytona in 1973 and the Targa Florio that same year and other outstanding results.
The car to which I refer is this, and you can see its building at 1/32 scale in the side menu or by clicking here.

Porsche 911 Carrera RSR Prototyp

With the commercialization of the new 911 Carrera model in 1974, the Porsche racing department took it as a basis for developing a new career-client model adapted to the F.I.A. group 4 regulations. To this end, took the Typ 911/74 engine fitted in a car with modifications such as wider wheel arches, without goint too far as with the RSR Prototyp, a rear spoiler plane and larger, leaving the previous RSR ducktail type and a new front spoiler with a hole for the oil cooler. This way arose the Carrera RS 3.0, which quickly became a powerful weapon in the GT races.

Porsche 911 RS 3.0 IROC

I´ve also reproduced this car at 1/32 scale. The construction step by step of the model can be found in the side menu or by clicking here.

The RS version was given a new twist with the emergence of the 3.0 RSR model. The Typ 911/74 engine was replaced by the Typ 911/75. The various changes in the engine, higher elevation camshafts, Bosch injection, dual ignition and compression increased to 10:3 to 1 among others, getting 330 hp at 8000 rpm. Regarding the 3.0 RS, aesthetic differences focused on the tires of 15 inches in diameter (10.5 and 14 inches wide front and rear respectively), the widened wheel arches using fiberglass panels with openings for cooling the brakes, and a new rear wing and engine cover. All of this gave an even more spectacular look to than the RS, especially the rear of the car, and a weight of 900 kg. This is the car in question:

Porsche 911 RSR 3.0 Porsche 911 RSR 3.0 Porsche 911 RSR 3.0 Porsche 911 RSR 3.0 Porsche 911 RSR 3.0

As the year passed, new cars built were gaining output power up to 350 hp and slight aerodinamic modifications, as the plane front bumper, used first by the Brumos team and subsequently adopted by the factory cars. Here you have a picture of one of these more advanced models:

Porsche 911 RSR 3.0

The Porsche Carrera 3.0 RSR became the most successful group 4 car. In its first two years, the 911 RSR won everything, including the World Championship, IMSA and Trans Am. Was a widely used car in all forms of racing, both short lenght and endurance. In this sense, the grids of the 24 Hours of Le Mans in those years were full of RSR 3.0., always managed successfully in private hands, because in those years Porsche embarked on the development of turbo mechanics for models such as the turbocharged 2.1 Carrera turbo, 930 and all the long list of 935 models.

In the following address, is where I got the above photos, you can see a lot of very good quality photos of the RSR 3.0:

http://www.pbase.com/slidevalve911rsr/911rsr_factory_cars_1974

With such history and pedigree was inevitable that I would make a small tribute to this legendary Porsche model at 1/32 scale.

As I´m goint to start from the a 911 SC Altaya bodyshell, the adaptation is completely known, only I´m goint to show the steps that are specific to the model, as are some detail of the bodywork and the rear wing construction. For the rest, nothing new about what you have already seen.

The first modification I will do to the body is that of the front bumper, which is slightly different from the starting model. After remove the paint fully I open the hole for the oil cooler.

Porsche 911 RSR 3.0

As the nose of the car and exceedingly long and square, draw a line with the shape it should have and take the excess with lime and sandpaper.

Porsche 911 RSR 3.0

The front indicators are too large so to make them smaller, I hit plastic strips of different thickness to the smallest gap. Using a square file I give the final shape and size.

Porsche 911 RSR 3.0

To finish the front bumper, I stick to the body.

Porsche 911 RSR 3.0

I widen the body in the same way that I have done with the same body in other occasions, such as the Porsche 935 Vallelunga or RSR Turbo.

Porsche 911 RSR 3.0 Porsche 911 RSR 3.0 Porsche 911 RSR 3.0

On the back I made the necessary hole to place the rear grid, but placed it a little low. Since I could not leave it that way, a 911 Fly Car Model rear wing helped me to open the hole for the rear grille in the right place:

Porsche 911 RSR 3.0

Mark the position were the grill must be placed

Porsche 911 RSR 3.0

And I got left in place instead

Porsche 911 RSR 3.0

I decided to do the rear wing as a separate body part. First draw the shape over graph paper who stick to a plastic sheet. Later I cut the piece following the contours of the drawing.

Porsche 911 RSR 3.0

On the bottom I hit putty which gave shape with file and sandpaper.

Porsche 911 RSR 3.0

And to finish with the basic modeling of the car, a pass with sandpaper over the entire body surface and a coat of primer before continue the work.

Porsche 911 RSR 3.0

...To be continued...

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