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66 years later: Fulda is introducing a new sophisticated
high-tech tire to the market. For the most extreme dimension
of this tire line, 315/25 ZR 23, licensed for speeds of more
than 350 km/h, and that as a series tire, not a racing tire,
what was needed was a high-speed vehicle but not a racing
car. A few years ago, one the most exclusive German
automobile makes was revived, why not
organize a joint project together once again, just like in
the old days?
The model phase starts
Three model construction phases in the
manufacture of a special vehicle are decisive in the
development process:
- the exterior design reference model (for the
construction of the negative molds)
- the interior reference model and
- the chassis order with auxiliary frame
Based on detailed and strict time
schedules, all three phases were realized simultaneously.
The well-known Italian vehicle study manufacturer Stola in
Turin was commissioned by DaimlerChrysler to build the
Exelero. The sports coupe was also now given its final
project name: Maybach Exelero.
On 31 May 2005 everything was ready. All
three phases were completed. The 1:1 model for the exterior
had been tested in the wind tunnel many times, modified and
adapted. The interior details were fixed: natural leather,
neoprene, coated punched aluminum sheet as well as carbon
fiber in glossy black and red are the main materials. And
the technicians who worked on the vehicle had arranged,
rebuilt and made ready for use all the functions and the
parts needed for this. Dipl.-Ing. Jurgen Weissinger, the
responsible project technician and development manager at
Maybach, connected the battery, turned the ignition key and
the car growled into life. The short burst of gas suggested
record speeds.
The construction and test phase
concluded with a outstanding success
Transforming a limousine, the basis for
the Exelero is the Maybach 57, into a coupe is extremely
demanding. Jurgen Weissinger and his team were astonished to
find that, although the dimensions of the former SW 38
differed in the length (the Maybach 57 has a 290 millimeters
longer wheelbase), in terms of breadth and height they were
very similar. That simplified a whole series of structural
measures.
When considering the engine alternatives,
it soon became clear that the basic twelve-cylinder engine
used in the Maybach limousines would not achieve the desired
maximum speed of around 350 km/h despite the Biturbo turbo
charger. Here, the Mercedes Car Group leapt into the breach.
The engine specialists in Unterturkheim, the place where all
basic engines are developed, provided energetic support for
the project.
After several optimization of the Maybach
type 12 engine, the cubic capacity was increased from 5.6 to
5.9 liters and the turbo charge optimized. The result was
convincing: on the test bed almost 700 hp and at least 1,000
newton meters of torque were recorded, sufficient to achieve
the targeted maximum speed of 350 km/h.
Before, during and after the
aforementioned work, the individual evolutionary steps were
supported by corresponding tests. Either on engine test beds
in the plants or on test tracks like the high-speed oval in
Nardo/Southern Italy or the test track in Cloppenburg.
The final test measurements at the end of
April/beginning of May 2005, once again on the high speed
Motodrom Nardo, then produced the well-earned success of
lost of hard work: a top speed of 351,45 km/h - a world
record for limousines – on standard tires.
And yet another world record: between the
Fulda idea, the outstanding cooperation of all concerned and
the delivery of the Maybach Exelero sports coupe, just 25
months passed.
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