Quantum XtremeAlthough unashamedly of Lotus 7 inspiration, the Xtreme offers refreshing styling and surprising practicality - the lockable boot has the capacity to house all of the weather gear, as well as a weekend bag!


Originally called the 175 and branded as Savant, the car was marketed by Sector Three Engineering. The original design was by notable designer Richard Ashby and Steve Greenwood. In approximately year 2000 it was purchased by Quantum Sports and renamed the Xtreme.  The car is based around an exceedingly high quality stainless steel monocoque chassis, the torsional stiffness of which has been tested at over 4000 NM, far superior to the 2000 NM typically achieved by traditional spaceframe construction. All fixing holes are laser cut into the chassis - even for the items such as the wiring loom, brake pipes and fuel lines - with captive nuts where required. All components can therefore be easily and precisely fixed to the chassis, without the requirement of any specialist tools.

The entire suspension set up is designed and manufactured specifically for the Xtreme, so there is no dependence on Sierra components, which would be completely unsuitable for this type of car. This combination of race-derived suspension and uncompromising chassis gives class leading ride and handling.

Vital Statistics
Chassis :
Stainless steel monocoque.
Body Panels :
GRP in self pigmented polished gelcoat (paint finish also available).  All moulding lines removed and fully surface polished.  Option of cycle wings or swept wings (clam shell style).
Engine :
2000 pinto as standard, often coming with donor vehicle.  Many other options available, including 2000 Cosworth Turbo, 1800 and 2000 Zetec, 1600 ZetecSE, 1800 and 2000 Duratec, Rover V8, 2000 Nissan.  Many other engines fitted
Transmission :
Rear wheel drive. 5 speed manual, usually Ford Type 9.
Front Suspension :
Independent wishbones with inboard coil springs over shock absorbers (purpose designed and made).
Rear Suspension :
Fully independent with semi-trailing coil springs over shock absorbers (purpose designed and made).
Steering :
Unassisted rack & pinion.
Dimensions :

Length - 3.44m
Width - 1.67m
Wheel Base - 2.35m

Luggage :
Boot - 160 litres.  Minimum critical stowage dimensions 1140 x 220 x 600 (mm)
Donor :
Any Mk2 Ford Sierra (B-reg onwards).  Non Ford power options also available.