HEAVILY MODIFIED GENERAL MOTORS KAPPA
PLATFORM
In order to go into a detailed description of the Vauxhall VX Lightning Concept it is necessary to go back to the inception of the Kappa platform. The General Motors Kappa platform was designed specifically as a sub-compact rear wheel drive chassis for open top roadster applications. The architecture first debuted as a production vehicle in 2006 as the Pontiac Solstice, in 2007 as the Saturn Sky and then as a re-badged Sky in the form of the Opel GT for Europe. It was also sold in South Korea as the Daewoo G2X. A hardtop coupe version of the Pontiac Solstice was produced briefly for the 2010 model year until Kappa production ended with General Motors filing for bankruptcy in July 2009. s a result the Kappa platform was sold to Spanish Car maker Tauro who now use the chassis for their production roadster the Tauro V8 Spider.
A GM PRESS PICTURE OF THE HIGHLY ADAPTABLE KAPPA
PLATFORM
In 2002, the Pontiac Solstice Concept was first shown in two forms,
a drivable roadster convertible, and a design study of a fastback
coupe. The concept was received very well at the 2002 NAIAS. The
problem was the drivable roadster concept car shown had been
cobbled together from many different components,
including using a heavily modified portion of the GM Delta
platform. The thinking at the time was that the architecture might
be used to produce the Solstice at some point in the future. Due to
the overwhelmingly positive reaction GM decided to go for
a
production version of the original concept as a high style, low
volume niche car for enthusiasts. The problem was they did not have
a production ready platform to build it on. Therefore, the Kappa
platform was developed to provide the necessary structure for a
two-seat, rear-wheel drive convertible. It features hydro-formed
rails and a tunnel structure similar to the Corvette
architecture, and is designed for a short-long-arm suspension front
and rear. It features rear wheel drive, longitudinal-mounted
transmission and front engine mounted well back for weight
distribution. GM claimed that the platform was only designed to
accommodate the ECOTEC Family II engine as well as only being able
to be LHD.
THE PONTIAC SOLSTICE CONCEPT FROM 2002
THE SATURN CURVE CONCEPT FROM 2004
THE CHEVROLET NOMAD CONCEPT 2004
Three other concept vehicles were built off the initial Kappa platform and shown at the 2004 NAIAS: The Vauxhall VX Lightning, The Saturn Curve and the Chevrolet Nomad. All three cars were received reasonably well, but were not nearly as embraced as the original Solstice Concept. The original 2003 Vauxhall VX Lightning Concept is the same size as the original Solstice Concept, and pieced together in the same manner as the 2002 Solstice Concept, and had been shown in Europe several months earlier, before the Kappa platform had been finalized and named (debuting approximately mid-May 2003, for Vauxhall's Centenary celebration). The Vauxhall VX Lightning is the styling pattern on which the appearance of the Saturn Sky is based. When the Vauxhall VX was shown at the 2004 NAIAS, the Lightning part of the name was dropped and the vehicle referred to in the literature at the show as merely the "Vauxhall VX". The Saturn Curve and the Chevrolet Nomad concept cars were built on "modified" versions of the Kappa platform, and exhibited on 12ins longer wheelbases and 2+2 seating. Another concept car, built by Holden and called the Torana TT36, was rumoured to have started as a Kappa based car with a twin-turbocharged V6, but the modifications necessary to accommodate the engine, transmission, and general vehicle size made it almost totally different so the platform was referred to as "based on architecture similar to the Kappa and the Corvette." The Kappa architecture uses major components from nearly every GM division and modern platform:
1. The rear axle and differential are from the Sigma based Cadillac
CTS
2. The passenger-side airbag, steering column, exterior and
interior door handles are from the Delta based Chevrolet Cobalt /
Pontiac G5
3. The heating, ventilating, and air conditioning modules are from
the Hummer H3
4. The 2.4 L Ecotec engine is shared with the Delta based
Saturn Ion, Pontiac G6 & 5, Chevrolet Cobalt & HHR
5. The five-speed manual transmission is from the Hummer H3, GMC
Canyon and Chevrolet Colorado
6. The five-speed automatic is from the Cadillac CTS, STS &
SRX
THE PRODUCTION PONTIAC SOLSTICE WAS VERY CLOSE TO THE ORIGINAL CONCEPT
THE SATURN SKY WAS HEAVILY BASED ON THE PONTIAC SOLSTICE
THE OPEL GT WAS A CLONE OF THE SATURN SKY AND WAS IMPORTED FROM THE US
THE
PRODUCTION SATURN SKY WAS ALMOST IDENTICAL TO THE OPEL GT AND BUILT
IN THE SAME PLANT
A LESS WELL KNOWN VARIATION WAS THE DAEWOO
G2X
The VX Lighting idea came about at the 2002 NAIAS with a meeting of
Kevin Wale Vauxhalls Chairman & Managing Director and former
Vauxhall design chief Wayne Cherry Vice President GM Design. The
idea was to create a concept to celebrate Vauxhall’s 100th birthday
based around the same idea as the Pontiac Solstice Concept. Wayne
Cherry gave the go ahead there and then. Almost a year later, on 14
May 2003, Vauxhall unveiled the VX Lightning concept at the
Dorchester Hotel in London. The Vauxhall Lightning Concept was a
joint project between the GM North America (GMNA) Advanced Design
Studio in England
and the Vauxhall / Opel Design Centre in Rüsselsheim, Germany. The
programme was initiated by Wayne Cherry and carried out under the
overall direction of Anne Asensio, Executive Director of Advanced
Design, and Martin Smith, GM Europe Director of Design at the time.
The Lightning was designed and developed at the relatively small
GMNA studio in Birmingham (which alas is no more).
The team was headed by GMNA Advanced Design Director and chief designer on the Lightning, Simon Cox and the Vauxhall / Opel Design Centre in Rüsselsheim, Germany. The programme was initiated by Wayne Cherry and carried out under the overall direction of Anne Asensio, Executive Director of Advanced Design, and Martin Smith, GM Europe Director of Design at the time. The team was headed by GMNA Advanced Design Director and chief designer on the Lightning, Simon Cox.
The joint design team included Opel Advanced Chief Designer Stefan
Arndt, Dale Grewer (exterior), and Jochen Werner (interior). As a
commemorative vehicle the emphasis in the grille and elsewhere was
the Vauxhall 'V' motif. It provides a bold front, as the front
fascia flares back with two hood lines completing the arrow-like
shape that seems to drive the long-hooded vehicle forward.
Reinforcing the 'V' theme is the creased centre line of the bonnet,
rear deck lid and facia. The angular headlamps continue the themes
introduced on
the VX220, integrating with the dramatically peaked front wings. In
classic British roadster style, the bonnet is long and the rear
overhang short. The VX Lightning showed a further evolution of the
Vauxhall / Opel form language from the VX220, with a more subtle
softening up of the surfaces.
THE ORIGINAL SKETCHES BY SIMON COX ALREADY GIVE A CLUE TO THE FINAL SHAPE
The rollover hoops beautifully sculpted into the rear deck, with just the touch of a crease, is an indication of the new softer, but still edgy direction GM’s European team was taking. An interesting detail is the polished metal air vent panel in the body side air outlet. The rear view mirrors seem to have been formed by high-velocity air, stretching them to a speed shape.
PRESS PICTURES FROM THE LAUNCH OF THE VX LIGHTNING CONCEPT AT THE
DORCHESTER HOTEL IN LONDON ON 14 MAY
2003
MARTIN SMITH (LEFT) THEN HEAD OF VAUXHALL / OPEL DESIGN & SIMON COX (RIGHT) GMNA ADVANCED DESIGN DIRECTOR WITH THE VAUXHALL VX CONCEPT
GENERAL MOTORS' CEO RICK WAGONER WAS ONE OF THE MANY HIGH PROFILE COMPANY EXECUTIVES ON HAND FOR THE UNVEILING OF THE VAUXHALL VX LIGHTNING CONCEPT
Inside, deeply sculptured seats were finished in black and red leather, while red leather was also been used to trim the sweeping dashboard. The seats, inspired by Italian motorcycle racing gloves, were untreated red aniline leather with a thick buffalo-type grain. Pads of dark charcoal leather were added over the surface or in the case of the door and the IP hood, the red leather floats as a panel over the surface, slightly offset from the main structure. The ebony piano lacquer used as an accent on the centre console and framing the instrument dials added a note of elegance that moved the car up a few levels from the Vauxhall VX220. The VX Lightning had a new version of Vauxhall’s all aluminium 2.2 ECOTEC engine, reworked with a supercharger to produce a maximum power of 240hp and 305Nm of torque. A six-speed manual gearbox was mated to the new engine, which drove the rear wheels. The chassis incorporated independent suspension, the front end using a simple and reliable strut configuration with rack and pinion steering. At the rear, the independent suspension was all aluminium for weight saving. Overall, the car managed a near perfect 50:50 weight distribution for handling and agility. The vehicle used a 95-inch wheelbase, was 45 inches high, 153.1 inches long, 71 inches wide and weighed 2,900 pounds. It rode on 19-inch alloy wheels in the front and 20-inch alloys in the rear, with Michelin Pilot rubber. Kevin Wale, Vauxhalls Chairman and Managing Director, described the Lightning as "a return to our early performance roots when Vauxhall was famous as the manufacturer of the first true British sports car – while we continue to be both innovative and bold in exterior and interior design." He added, "Ultimately, the VX Lightning, as a classic roadster, represents the best of our past, and our future – a vehicle that is quintessentially British." At the time rumours swirled in and around Detroit that the production Solstice would go ahead, which it did. There was also serious hope that the Lightning would go into production, but it did no more, along with the GTC Geneva concept, than give an indication of the Vauxhall / Opel new design direction, and a prequel to the Frankfurt Motor Show in September that year. It was a fitting tribute to Vauxhalls 100th birthday - a sports car designed and built in Britain. Check out the jigsaw of pictures below for a full blown view of every aspect of the car.
SPANISH CAR MAKER TAURO CURRENTLY USE THE KAPPA PLATFORM FOR THEIR PPRODUCTION ROADSTER THE TAURO V8 SPIDER
PICTURE MONTAGE:
SPECIFICATIONS:
Engine:
Modified, Supercharged 2.2 litre ECOTEC L850
Inline-4 cylinder
Position:
Front
Power:
240
bhp
Specific
output:
109.09 bhp per
litre
Bhp
/ weight
ratio:
182.09 bhp per
tonne
Torque:
225
ft-lbs
Transmission:
GM T56 Six speed
manual
Body
/ frame:
Composite body over Steel
Unibody
Driven wheels: Rear
Wheels:
Machined
aluminium
Front: 19 x 8.5ins
Rear: 20 x 9ins
Tyres:
Front: Michelin Pilot
245/35R19
Rear: Michelin Pilot
255/35R20
Brakes:
Power assisted disc brakes front &
rear
Suspension:
Front: MacPherson
Struts
Rear: Independent
All adjustable for rate and
travel
Dimensions:
Height:
45.0ins
Length: 153.1ins
Width: 71.0ins
Wheelbase:
95ins
Track front:
60.3ins
Track rear:
60.5ins
Curb weight: 2900lbs
PRESS RELEASE:
BROCHURE:
THE ONLY BROCHURE ISSUED FOR THE VX LIGHTNING CONCEPT & IT WAS ISSUED IN THE US
ROAD TEST:
AUTO EXPRESS: ONE OF THE FEW TO ACTUALLY DRIVE THE VX LIGHTNING, THIS IS WHAT THEY SAID:
"Who says lightning doesn't strike twice? As well as being the
first magazine to reveal the sensational new Vauxhall VX Lightning,
Auto Express has become the first behind the wheel as well.
The Verdict:
Although a concept, the VX Lightning is a remarkably well developed car. As well as being one of the best looking Vauxhalls ever, it proved great fun to drive on our short test. Unlike most show cars, the engine is a delight and the suspension feels sorted. Even the switchgear actually works! With a £23,000 target price, it is bound to cause a storm when it arrives in 2005.
Who says lightning doesn't strike twice? As well as being the first
magazine to reveal the sensational new Vauxhall VX Lightning, Auto
Express has become the first behind the wheel as well.
When the high-voltage VX220 replacement took a bow earlier this
year, we knew we simply had to have a go. And now, two months
later, our wish has come true. We grabbed the opportunity to fire
up the car at the Goodwood Festival of Speed, where it took pride
of place on Vauxhall's stand.
Based on the Pontiac Solstice, revealed at the 2002 Detroit Motor
Show, the model has been styled exclusively in the UK. Powered by a
supercharged 2.2-litre four-cylinder engine, the Lightning is
bigger than the current VX220, which shares its platform with the
Lotus Elise. At the front, the Lightning gets angular wings and an
arcing bonnet. Further along the body, the classic looks are
enhanced with short overhangs and a carbon fibre undertray - and
there's even a practical boot. Twin rollover hoops are hidden
beneath the beautifully curved bodywork.
Massive alloy wheels - 19 inches at the front, and a staggering 20
inches at the rear - fill the arches. There are no door handles,
but you gain access to the interior by pressing a discreet button
just ahead of the roll hoops.
You'll need to drop yourself carefully into the floor-mounted,
leather-clad seats; the driving position is incredibly low, but
very comfortable. The button steering wheel is moulded to the shape
of your hands and the pedals are neatly spaced. The aluminium
gearlever, meanwhile, is mounted high in the transmission tunnel,
and shifts are only a wrist flick away. There's a great view of the
road ahead, but thanks to the low seats, you don't feel
exposed.
Starting the car is simple. Flick a switch under the dashboard to
connect the fuel pumps, then press a big red button mounted in the
centre console. The engine spins eagerly into life before settling
to an urgent idle.
At first, you could easily be forgiven for thinking the exhaust
sounds very much like the current VX Turbo's. But as you dip the
clutch, select first gear and head for the open road, a significant
change takes place - and it's all down to the supercharger.
Floor the throttle and the compressor wails noisily. With the
engine producing 240bhp and 305Nm of torque, the Lightning flashes
forward. More urgent at low revs than the Honda S2000, and as
tuneful as the Porsche Boxster, the car is great fun to drive.
Gearchanges are short, but the ratios are surprisingly well suited
to the engine.
The steering is needle-sharp, delivering great precision, and the
only thing that reminds you the Lightning is a concept rather than
a production model is the high gloss finish to the trim.
Even the suspension feels remarkably advanced, offering a great
deal of stability. However, cast in aluminium, the independent
set-up creaks and groans over big bumps, and feels too stiff for
comfort on long journeys.
Pricing is not confirmed, but is likely to be around £23,000.
However, bear in mind that the firm is in no hurry to get the car
on sale. With order books just opened for the new VX Turbo, it will
be 2005 before a production Lightning hits the road. The countdown
begins"