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Thursday 28 August, 2008
 23:43 | 3/Jun/2008 |  0 Comment(s)
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GT500KR : The most powerful Mustang

With Texas-seized fanfare, complete with fireworks and a chili cook-off, Carrol finished his 85th lap of the sun this past March.




For, on the same day he clicked off 85 years, the first example of the latest and perhaps the greatest car to bear his name, the 2008 Shelby GT500KR (as in “King of the Road“),
rolled out of the company’s Las Vegas shop. This new KR, which is
essentially a 2008 Shelby GT500 Mustang turned up to eleven, was created to celebrate the 40th Anniversary of the original King of the Road, a hotted -up version of the already plenty hot 1968 Shelby GT500.



Chatting with Mustang architect Lee Laccoca one day in 1967, ol’ Shel
got the wind of plans within Chevrolet to announce a King of the Road
version of the Corvette in a scant 2 weeks. The car debuted in April of
1968 with 428ci Cobra Jet V-8 engine, very conservatively rated at
335hp and 440 pf of torque. Before they were done, Shelby and For
d had unleashed 1571 GT500KR Mustangs
on an unsuspecting America; 1053 fastback coupes and 518 convertibles.
The new KR is a coupe-only model, and among the modern-era Mustangs, it
perhaps best recalls the dizzyingly fast Cobra R from 8 yrs ago. Like
the Cobra R, the GT500KR as first seems almost too
savage and single minded for its own good, monumentally powerful and
possessed of preternatural racetrack reflexes.



But
the King is vastly more civilized, offering a surprisingly tame Highway
ride and amenities the Cobra R never did, including AC, a stereo, and a
back seat. You can even specify a DVD-based navigation system and a Sirius Satellite Radio.



The sprawling facility, now home to the Ford Racing High performance Driving School,
is the grand undertaking of Utah businessman, Larry Miller, who, in
addition to owning more than 40 car dealerships and the Utah Jazz
basketball team, happens to be a Shelby and Ford fanatic. Among the
inestimably valuable cars in his tidy museum is the very first
production Shelby Cobra (CSX2002) and the 1966 Le
Mans-winning GT40. There is very little about the Shelby GT500KR that
can be described as restrained. To their credit, however, SVT and
Shelby exercised a remarkably light touch in the appearance department.
Everything that looks different here is different for a purpose.



The KR is a bit more hunkered down than the GT500;
it is lower by 20mm up front and 15mm at the rear. A broad carbon fiber
front splitter increases downforce over the front wheels by a
significant 31% while reducing drag by 3%, and a revised rear spoiler
(more petite than the GT500’s) helps cut the car’s drag coefficient from 0.384 to 0.372.



Otherwise, there are the expected stripes and rocker-panel graphics, a handful of the 40th anniversary badges,
embroidered head-rests we could do without, a numbered plaque on the
dashboard and the hood – a scooped and vented tumescent sculpture in
carbon fiber. The suspension is fundamentals unchanged from the rest of
the Mustang range – struts up front and a solid axle at the rear – but
SVT has revised every aspect of its tune for KR service. During discussions with engineers from SVT and Shelby regarding KR’s handling,
the conversation turned to that live axle. “Surely there is a better
solution than a big hunk of iron b/w the rear wheels,” say journalists.



“Surely a sophisticated independent rear suspension would better befit a vehicle of the King’s stature and price tag.”



With
a burly iron block and aluminium 4-valve heads, the KR’s suprcharges
and intercooled 5.4l V-8 is an impressive sight, filling the Mustang’s
engine bay like Ray Lewis fills a bathtub. The engine
barks to life with 540hp and 510 pound-feet of torque, which is 40
horses and 30 pound-feet more than the standard GT500. Don’t be
deceived by this relatively modest bump in output, however. The
difference in character b/w the two cars is dramatic – every bit is
pronounced as the differences b/w the base Mustang and the GT, and b/w
the GT and the GT500. Aerodynamics and underhood air management
figured prominently in the KR’s development, motivated by the
expectation that more than a few KR owners actually know their way
around a racetrack.



Far more than just a style statement, the car’s visually defining twin-nostril
carbon fiber composite hood is a terrifically clever piece of kit and a
masterfully engineered tool for managing the flow of air.



Technical Specification:
















































































































































































































































































Bodywork

















Type



2+2 Fixed-head coupe






No. of Doors



2















Dimensions & Weight


















Wheelbase



2720 mm



107.1 in



Track – Front



1572 mm



61.9 in



Track - Rear



1588 mm



62.5 in



Length



4775 mm



188 in



Width



1877 mm



73.9 in



Height



1365 mm



53.7 in



Wheelbase Ratio



1.76






Ground Clearance



120 mm



4.7 in



Kerb weight



1771 kg



3904 lb



Weight Distr. (front)



58%






Fuel capacity



60.6 l



13.3 UK Gal












Engine


















Bore x Stroke



90.22 mm x 105.80 mm



3.55 in x 4.17 in



Cylinders



V-8 in 90 deg Vee






Displacement



5409 cc






Type



Double Overhead camshaft



4 valves per cylinder


Total 32 valves



Construction



Aluminum head



Cast Iron Block



Sump



Wet sumped






Compression ratio



8.40:1






Fuel System



EFI






Maximum Power



547.5 PS @ 6250 rpm



540.0 bhp (402.7 kW)



Specific Output



99.8 bhp/l



1.64 bhp/cu in



Maximum torque (SAE net)



692.0 Nm @ 4500 rpm



510 ft-lb (70.6kgm)



Coolant



Water






Bore/Stroke ratio



0.85






Unitary Capacity



676.13 cc/cylinder






Aspiration



S/charged






Compressor Type



1 Roots-type supercharger






Intercooler



Air-water






Catalytic Converter



Y















Chassis


















Engine Location



Front






Engine Alignment



Longitudinal






Drive



Rear Wheel Drive






Steering



Rack & Pinion PAS






Wheels – Front



9.5 x 18






Wheels – rear



9.5 x 18






Tyres – Front



P255/45 Z-18






Tyres – Rear



P285/40 ZR-18






Brakes – Front



356 mm






Brakes – Rear



300 mm






Top Gear Ratio



0.63






Final Drive Ratio



3.73



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