2008 KTM X-Bow
|2 liter TFSI inline-4||
|turbocharger & intercooler||
|7.3 lbs per hp|
|120 hp per liter||
(from KTM Press Release) 2008 KTM X-Bow
Exhibited at Geneva in limited-edition ‘KTM X-Bow Dallara’ form
Aggression and purity of original concept retained
Carbon fibre monocoque is unique feature
240 bhp 2-litre Audi TFSI engine for spectacular performance
True open car driving experience without roof or windshield
Start of production set for mid-2008
The KTM X-Bow: A Success Story
specialist manufacturer KTM celebrated the world premiere of its
first-ever car at the Geneva Motor Show in 2007 when the X-Bow was
born. The company sounded out the exclusive lightweight sports car
market with an aggressive design and a spectacular concept, complete
with carbon fibre monocoque and purist, minimalist fittings.
Following an overwhelmingly positive response from sports car enthusiasts and motoring media all around the world, the decision was made to go ahead with further development for the series production model of the KTM X-Bow.
Now, on the anniversary of that world premiere, KTM exhibits the results of the continued development, showing the production-ready version of the KTM X-Bow for the first time and in the exclusive form of the ‘X-Bow Dallara’ which will be a limited-edition of just 100 units.
It says a lot about the dedication of the KTM engineers and testifies that the concept was so ‘right’, that the series production model unveiled at Geneva stage looks so similar to the original car. The original character of the KTM X-Bow is not watered down with only a few concessions to meet technical, legal and practical requirements. The central inlet to the air box is higher and larger and alterations to the instrument panel are the most noticeable changes.
The original spirit of the KTM X-Bow is retained and it is still ‘ready to race’. The first series production vehicles for customers will be seen on the road in the late summer of 2008.
Puristic and Avant-garde: The Concept
The most outstanding
technical feature of the KTM X-Bow is its carbon fibre monocoque.
This avant-garde material and construction technique has been highly
developed for use in Formula 1, racing cars and expensive exotic
sports cars for the road. Its use by KTM places the X-Box in a
privileged position among a small, but elite group of puristic
lightweight sports cars.
This monocoque, which is manufactured by the specialist Wethje in Southern Germany, incorporates a crash box at the front and a solid sandwich structured floorpan and creates a structure that delivers safety without compromise. At the same time the sophisticated carbon fibre material is also the key to the vehicle’s status as a lightweight sports car. The KTM X-Bow weighs just 790 kilos.
The monocoque was developed together with the Italian racing and sports car specialist Dallara (in whose honour the first 100 limited-edition cars are named). The Italian company also assisted with the development and tuning of the chassis, which will be offered in two configurations. In the series production model, the chassis comes with a double wishbone and push rod suspension at the front.
As an optional extra, KTM can supply the X-Bow with a motor racing chassis, which features altered suspension geometry and settings and is also fitted with a pre-load adjuster so that the clearance of the vehicle can be varied. On this chassis version, the shock absorber elements from WP are adjustable in both rebound- and compression damping.
The production KTM X-Bow is powered by a lightweight, compact, high performance, high efficiency 2-litre Audi TFSI engine that is the perfect complement to the car’s character. In contrast to the original concept the Audi engine now boasts a 177 kW (240 bhp) output, with maximum torque of 310 Nm. The KTM comes with a six-speed manual transmission with close-set ratios. Thanks to its low weight the KTM X-Bow can exceed the performance of many supercars that are twice as powerful. It can accelerate to 100 kph in just 3.9 seconds. The fuel consumption has been set at a preliminary value of approx. 7,5 liter at 100km.
With its puristic concept, supercar performance, immensely capable chassis and aerodynamics that have been purposefully tuned to generate downforce, the KTM X-Bow is the perfect car for the racing circuit – as well as the road.
The KTM X-Bow, with its advanced technology and radical technical solutions is directed at enthusiasts who are seeking a genuine, unfiltered driving experience.
To ensure that it is a road-legal car, KTM has already certified the X-Bow for use in most European countries. With the general ratification of the new ‘European Small Series Homologation’ regulations scheduled for first quarter of 2009, the road-legal status will be extended to include all the countries of the European Union. Further export markets are constantly being examined.
Concept and Series: The difference is in the detail
Because weight kills
performance and mars the driving experience many traditional comfort
and convenience features were not present in the original KTM X-Bow
concept car. Radical construction without a roof or conventional
windshield, and doing without air-conditioning and an entertainment
system, allow a sharp focus to be kept on delivering the kind of
driving experience that can usually be found only on a motorcycle.
Now, KTM has not wavered from its original goals and only very small modifications differentiate the prototype exhibited at the Geneva show in 2007 from the production model exhibited in 2008.
The most obvious change is the enlargement of the central air intake between the headrests to ensure adequate cooling for the engine compartment during demanding track-day activities.
The new arrangement of the instruments is a more marked change. Originally KTM had positioned all indicator and control elements and a display on the steering wheel. However comprehensive testing showed that the readability of the display on the steering wheel was not ideal. So, it was decided to create a display with the most important information at the top of the centre console – the instruments echoing the style of those recently presented on the new KTM RC8 superbike. This compact, lightweight instrument panel is shower- proof and in the best racing tradition, the control buttons themselves remain on the sports steering wheel.
Also new are the side windows, the even smaller windshield (now made from polycarbonate) and the new seating upholstery, which has been conceived and made by a renowned specialist. Because the seat shells are made of carbon and rigidly fixed to the monocoque the cushioning is available in a variety of sizes to suit drivers of different statures. A mechanically adjustable pedal box ensures that drivers can set-up a comfortable driving position with perfect ergonomics.
At the rear of the KTM X-Bow, the silencer now comes with two exhaust pipes which allow finer tuning of the exhaust sound for a more sporty sound.
The KTM X-Bow Dallara: the limited-edition beauty
At Geneva, KTM exhibits
the series production X-Bow in its most elite form – the special
limited-edition X-Bow Dallara model. KTM will celebrate the start of
production in the middle of 2008 by producing just 100 examples of
this version. These future collectors’ models have been sold out for
more than a year.
The fascinating X-Bow Dallara differs strongly both optically and technically from the production model that follows because it incorporates ‘as standard’ most of the factory-fitted options which will be offered on lesser versions.
For example, the bodywork comes in carbon (rather than plastic), the wheels have a quick release/quick locking mechanism, the racing chassis comes with adjustable suspension and the steering wheel is removable. A mechanical limited slip differential improves traction and stabilises the vehicle during extreme manoeuvres. Cosmetic design, aerodynamic, performance parts and wheel mudguards also feature carbon finish. Special graphics are maintained in this special series, a metal plaque in the interior presents the serial number of the automotive work of art.
The Extras: for the Automobile and the Driver
For those X-Bow
enthusiasts who weren’t lucky enough to be among the first 100
‘Dallara-series’ customers, the standard production model KTM X-Bow
is available with the choice of many of the optional extras found on
the limited Dallara edition. Aside from the special graphics and
Dallara plaque, it is possible to order all other extras from the
Dallara series model for the production car.
KTM’s recently-launched ‘Car Configurator’ system allows prospective buyers to view and specify the full range of extra equipment for their vehicle. Accessible through the KTM X-Bow website, at www.ktm-x-bow.com, the easy-to-use software gives a clear breakdown of the options available.
While European authorities permit driving the X-Bow without a helmet, KTM strongly recommends wearing a helmet and will present two options – developed exclusively for X-Bow – at the Geneva Show. The Arai closed racing helmet provides comprehensive protection and meets the requirements of the motor sports authorities. An open face helmet, manufactured by German company Schuberth is also offered to give better peripheral vision when driving X-Bow on the road. Both helmets carry X-Bow branding and will be available when the series production models go onto the market. A range of clothing and technical accessories for the driver are also in development.
Production and Aftersales: slim and efficient
Following the hugely
positive response to the introduction of X-Bow and growing demand
for KTM’s new quad bikes, which have recently been introduced in the
USA, KTM has decided that production of X-Bow will not be
outsourced, as originally anticipated. Instead, KTM has established
a new assembly facility specifically for the production of its
four-wheel products, near Graz in Austria.
The manufacture of the KTM X-Bow will create around new 50 jobs, as KTM produces 500 units in 2008, before the production expands to a maximum capacity of 1000 units annually, when the facility is fully operational.
KTM is in the process of finalising its network of specialist service partners to meet the aftersales requirements the X-Bow customers. When all agreements have been finalised, KTM plans to have a Europe-wide network of approximately 50 X-Bow service centres.
Delivery of cars is organised through the company headquarters in Mattighofen. Customers will be given the option of collecting their vehicle at their nearest service centre – or to have their new KTM X-Bow personally delivered to their door.
The Next Step: Visions for Tomorrow
While making the final
preparations for the start of series production and the expansion of
the service network, KTM is also planning to introduce the X-Bow
onto the racing circuit. A racing model for this purpose is in
development and the X-Bow will make its first public appearance on
the race circuit during 2008. In the longer-term, KTM is considering
the organization of a one-make series competition for X-Bow.
There are also further updates planned for the X-Bow itself in the future. A race-engineered version, which will increase power into the region of 300 bhp, is expected at a later date. The car will also be offered with an optional S tronic sequential double clutch semi-automatic gearbox.
The KTM X-Bow: highlights in detail
Carbon Fibre Monocoque: Racing Equipment for the Road
Carbon fibre monocoques
have been Formula 1’s safety net for many years. On the road, this
technology has always been reserved for the elite supercars in the
highest price ranges. KTM is proud to be the first company to offer
this chassis technology in a much more affordable form, and has
called upon the expertise of its development partners for this
project, Dallara, and carbon fibre specialists Wethje Group, to make
X-Bow a reality.
The Italian specialist from Varano Melegari, near Parma, Dallara has long been acclaimed as a carbon technology expert from the conception and design through to the production of components made of this light, yet rigid material. Dallara currently supplies the monocoque race-car chassis for international formula such as GP2, Indy Car (IRL) and Formula 3.
KTM has also been able to utilise the expertise of Wethje Group to manufacture the carbon fibre monocoque for the X-Bow. Widely considered as one of the most experienced specialists for carbon composite construction components, Wethje is a successful supplier to premium segment car manufacturers, as well as to Formula 1 and touring car teams.
The monocoque developed for the KTM X-Bow is not only extremely robust, it is also safe, thanks to an integrated crashbox in the nose, and yet it weighs only 75 kilos. This low weight is a crucial factor in ensuring the vehicle’s spectacular performance.
The Engine: TFSI Technology from Audi
To power the X-Bow, KTM
was delighted to form a partnership with Audi AG for developing the
drive unit. Audi’s 2.0-litre four-cylinder TFSI engine reflects the
X-Bow’s construction principles by featuring lightweight,
high-performance and intelligent technologies.
The engine’s outstanding attribute is its gasoline direct injection technology, FSI. For its KTM X-Bow application, the engine also boasts an exhaust turbocharger plus an intercooler. Thanks to FSI technology, this engine utilizes fuel more efficiently than one with ordinary intake manifold injection and it even consumes less fuel in the frequently used partial load range.
With FSI technology, the fuel injection takes place at a pressure level between 30 and 110 bar. Valves in the intake system direct the inflowing air into a cylindrical movement, and a continuously variable intake camshaft ensures optimal cylinder charging at any engine speed. Two counter-rotating balancer shafts compensate the second order inertia forces and so guarantee superior, low-vibration operation.
The KTM X-Bow’s long-stroke, four-valves per cylinder Audi engine delivers powerful performance with 310 Nm of torque between 2000 and 5000 rpm, while peak power (177 kW / 240 bhp) is achieved at 5500 rpm. Even more powerful engine variations in the 300-horsepower range are planned for the X-Bow in the future.
The transversely-mounted engine and drive train package is complemented by a VW-sourced six-speed manual transmission as standard. Drive goes to the rear wheels via an optional mechanical limited-slip differential. An optional S-tronic semi-automatic transmission will also be offered at a later date.
The Chassis: Direct and Competent
The X-Bow’s driving
dynamics benefit from the car’s low centre of gravity, the sporty
bias to its front/rear weight distribution and its superior chassis,
which draws on racing technology for its basic principles. The
relatively long wheelbase (2430 mm) and wide track (1644 mm front,
1624 mm rear) provide the foundations for a comfortable ride and
Employing double wishbones, front and rear, the suspension features components and damping elements by WP Suspension, with a pushrod arrangement up front. Available with a choice of ‘Sport’ or ‘Racing’ set-up, the chassis can be biased for road or track use respectively. While both options can be adjusted for traction and pressure settings, the Dallara-designed ‘Racing’ configuration is fitted with a pre-load adjuster for adjustment of the vehicle’s ground clearance.
KTM is also expanding its partnership with the famous Italian brake manufacturer Brembo into the world of automobiles. The X-Bow’s immensely powerful braking system consists of 305 mm ventilated discs with 4-piston fixed callipers at the front and 262 mm solid discs with 2-piston fixed callipers at the rear. The combination of the vehicle’s light weight, ideal balance, low centre of gravity and high-performance Continental tyres – 205/40 R17 front and 235/40 R18 rear – results in spectacular braking performance. When the brakes are warm, the KTM X-Bow needs only 33.1 metres to decelerate from 100 kph to a standstill.
The Aerodynamics: Exceptional Contact Pressure
The primary development
goal for the KTM X-Bow was not attaining extremely high top speeds,
but in optimising its driving dynamics. The sports car’s performance
is aided by an ingenious aerodynamics arrangement – the result of
many hours work in Dallara’s wind tunnel. The most important aero
element is the underbody, which is equipped with a prominent
diffusor at the rear. To make this diffusor work even more
effectively, the mounting points for the rear suspension were set as
high as possible. This enables the KTM X-Bow to achieve a phenomenal
downforce of almost 50 kg at 100 km/h and nearly 200 kg at a speed
of 200 km/h – approximately three times more than most other
The high-performance chassis plus this fantastic level of downforce makes extreme cornering speeds possible. The X-Bow can generate a lateral acceleration of 1.5 g. These g-forces and cornering speeds comfortably surpass the values achieved by most street-legal sports cars.
The aerodynamic concept posed a great challenge for the designers. They had to ensure that sufficient engine-cooling air could be channelled into the inlets located in the sides of the vehicle, behind the passengers, while not upsetting the aero-balance or the generation of downforce. This challenge was accomplished by using special air baffles, which are installed horizontally on the sides of the car so that the driver and passenger can also use them as boarding aids. The radiator is also located at the rear of the vehicle, to avoid having to install longer, heavier water hoses.
Safety: Racing Technology
The crucial component
protecting the driver and the passenger is the rigid, carbon fibre
monocoque – safety technology straight from the world of
professional motor racing. This structure is supplemented by a
crashbox in the nose of the vehicle, which fulfils stringent FIA
Formula 3 safety requirements. At the rear of the car, the exhaust
silencer is also designed to act as a crashbox; absorbing the force
of an impact to the rear of the vehicle.
The driver and passenger are protected by four-point safety belts, which can be equipped with a fifth securing point (a crutch strap) as an option. Twin roll bars are a distinctive feature of the X-Bow’s striking appearance. They not only look solid, they are skilfully integrated into the monocoque’s structure to offer the highest level of safety.
Design: Floating Elements
Gerald Kiska’s design
studio can take credit for the shape of the X-Bow. Coming from
Salzburg, Kiska has worked closely with KTM for the past 15 years
and has been entrusted not only with the design of the motorcycles,
but also with the appearance of the company itself.
For the concept of KTM’s first automobile, Kiska incorporated many characteristics that are more closely associated with motorcycles than cars. Every part of the 3.67-metre long X-Bow fulfils a function, the technology remains transparent, the form is noticeably simple. The few, orange-coloured body panels are ‘floating elements’, like those of motorcycles, and suggest lightness and simplicity.
The deliberate minimalism is applied to all things, even the lights: simple headlamps, embedded indicators flush with the car’s contours and round lights at the rear, avoid superficial, showy effects. Instead, the functional carbon structure also takes on design duties, meaning that components which are frequently hidden in cars, such as the silencer, suddenly serve an aesthetic purpose in addition to their usual functions.
The Equipment: Pure and Functional
As a result of its
strong, clear concept, the KTM X-Bow can do without a lot of
elements that ordinarily add complexity and extra weight to cars.
For example, the narrow wind deflector makes an elaborate heating
system and windscreen wipers unnecessary; doors are also not
included in the design, due to the vehicle’s low profile and the
extra-low side profile which makes for easy access.
Drivers will also search in vain for a standard instrument panel. All the information needed for driving is presented in the multi-functional display on the steering wheel.
The seats are further examples of the X-Bow’s intelligent and simple construction. The shells for the driver’s and passenger’s seats are already integrated into the carbon fibre construction of the monocoque, in a fixed position. An overlay provides firm support and comfort. In order to provide the best ergonomics for drivers of various heights, the X-Bow has manually adjustable pedals.
The KTM X-Bow doesn’t have a luggage compartment, but instead features an innovative, mobile storage box for the car documents. The equipment required by law, such as a warning triangle, first aid kit and a tyre-repair system, are carried in storage compartments beside the passenger’s foot well. A cover to protect the interior of the car when parked is stowed in the same location. Two helmets can be fixed in the passenger’s foot well.