Specifications

Engine: American Speed-Modified Chevrolet V8
Valvetrain: Pushrod OHV, 2 Valves per Cyl
Fuel feed: Multipoint Fuel Injection
Displacement: 6277 cc / 383.0 cu in
Power: 477.3 kw / 640 bhp @ 6500 rpm
Torque: 759.26 nm / 560 ft lbs @ 4800 rpm
Wheel type: 245/35X18 Goodyear Eagle F1 GS Fiorano
Front brakes: Ventilated Discs
Front wheels: F 18 x 9 cm / 74.4 x 3.5 in
Rear wheels: R 18 x 13 cm / 7.1 x 5.1 in
Weight: 950 kg / 2094 lbs
Transmission: Porsche G50 Five-Speed Transaxle
Top speed: 371.8 kph / 231 mph
0 - 60 mph: 2.7 seconds
0 - 100 mph: 5.5 seconds

Previously regarded as the fastest, the top flight McLaren F1 has lost its place to the Ultima’s new record-breaking GTR 640. As a street legal supercar, fitted with road tires and built to factory specification, the 640 has reached 0-100-0 mph more than a second faster then the mighty McLaren.

During this run on the Bruntingthorpe Proving Ground, the Ultima accelerated to 60mph in 2.8 seconds, hit 100 mph 3.0 seconds later, and then slowed to a standstill after only 9.8!

Following the success of the 9.8 run, the GTR 640 has become the fastest accelerating and decelerating production car in the world. Furthermore, Ted Marlow, Managing Director of Ultima, is now convinced that a low nine second run "is possible".Considering the 640 has outperformed the 0-100-0 times during separate 0-60 and 0-100 mph tests, he is probably right.

The phenomenal results that the 640 can achieve are made possible thanks
to its exceptional power to weight ratio. Sitting in the center of its
well developed chassis is a normally aspirated 640 bhp 377ci Chevrolet
V8 prepared by AmericanSpeed. Since the body and chassis are of a ‘no
frills’ design, this engine provides 685 bhp per ton. In addition, if
a customer is willing to sacrifice a little drivability, AmericanSpeed
- the Illinois company responsible for developing the engine - can supply
up to 720 bhp!

Since 1999, Ultima has been offering their low-volume GTR both as a kit and ‘turnkey’ car completed by the factory. The press has described these Ultimas as having McLaren F1 performance for a fraction of the £630,000 price. In fact, McLaren realized the potential of this chassis design when they used it to test the F1’s engine and transmission.

Since Ultima has created the chassis to handle many different power train combinations, one GTR with a DART 427 sold at the 2005 Barret-Jackson Auction for a cool $103 000 USD.

In all fairness, the McLaren/Ultima comparison is a little like apples
and oranges. The Ultima is void where the McLaren offers perks such as
upholstery, storage spac active aerodynamics and a LeMans-winning chassis.
However, with no driving aids, both cars do have a direct connection to
the road and are dedicated to performance unlike most other sports cars
today.