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Radical Sportscars is a British manufacturer and constructor of racing cars. The company was founded in January 1997 by amateur drivers and engineers Mick Hyde and Phil Abbott, who built open-cockpit sportscars which could be registered for road use and run on a track without modification. Although most of Radical's sportscars are road legal, they also build some purpose-built racing cars, such as the SR9 Le Mans prototype.

sr3xxr

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Radical Motorsport has unveiled the full specification of its all-new SR3 XXR. Enhancing the proven formula of the SR3, the UK-based motorsport firm has focused on performance, usability and durability while retaining the essence of what makes the SR3 the most successful prototype-style sports racing car in the world.
SR3 models currently make up the majority of grids in the 12 Radical Cup championships around the world, with over 1,500 sold to date. Today, the team behind the renowned SR3 has confirmed that it has upgraded the model - and it is now available to order in SR3 XXR guise - to be more thrilling and provide drivers with the power to lap for longer, with more agility and speed.
Powering the major change is the all-new engine from in-house Radical Performance Engines (RPE). Delivering 232 bhp from the revised 1500 cc unit, the lightweight SR3 XXR is expected to maintain its impressive power-to-weight ratio exceeding 350 hp per tonne. With the ability to run on biofuel from day one, the use of the Generation 5 engine also makes the SR3 XXR the first Radical that can run on biofuel.
Delivering on customer feedback, the SR3 XXR has been modified to be more agile on track, especially in crucial pit lane stages in which saving time, while not being penalised for speeding, is pivotal. With a new pit limiter fitted as standard, the chance of being punished for speeding through the pit lane is eliminated. The LMP-inspired central tail ‘shark fin’ delivers notable aerodynamic improvement to entry and mid corner stability. The SR3 XXR is also clearly differentiated by its lightweight wheels in a new design alongside high-intensity DRL lights. A carbon fibre splitter and rear diffuser will be offered as an option to improve durability and aerodynamics on track.

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The Radical SR8 is a British sports car made by Radical Sportscars.

The SR8 is basically the same car as the SR3 with the addition of 4 more cylinders and 2x the power at a cost of 150lbs of increased weight (as a result of the engine, transmission, oiling, cooling system and brake upgrades). The SR8 uses the same body/frame/electronics/suspension but with larger brakes and a Quaife transmission to mate up to the V8, which itself is a combination of 2 SR3 engines with a custom block, crank, and dry sump oiling system. The engine is based on the Suzuki 1340cc Hayabusa motorcycle engine, using its cylinder heads and rods with different pistons that bump compression from 12.5 to 14:1, upgraded cams, ported cylinder hears and a custom intake and exhaust system - these changes move up the Hayabusa spec power from 190hp to 220hp for the SR3 and 430hp for the 2680cc SR8 V8. The torque curve is very flat making this engine superbly linear. The additional cooling requirements add a second sidepod mounted radiator, a transmission cooler, and 300mm brake rotors (up from 260mm).