Radical SR3 XXR introduces radical updates for 2023
Radical’s popular track-only SR3 has been given some significant upgrades
British track car specialist Radical has revealed a new iteration of its SR3 called the XXR. Closely based on the existing model, the new XXR features lots of new content under the skin, including extensive upgrades to its powertrain and brake package.
Located behind the driver is a new 5th generation of Radical’s own 1500cc RPE engine, which is now rated at 232bhp – 6bhp more than the existing 1500cc engine found in the previous SP3. Changes to this next generation unit include the addition of forged connecting rods, lighter crank pins and a new ignition system, while the heads have improved flow rates. As well as more power, these upgrades have been designed to improve engine responsiveness, particularly at the higher end of the rev band from 6500-10,000rpm.
The six-speed sequential transmission has been reinforced, and both gearbox and engine have received all-new calibrations, giving the engine the ability to now run on E85 biofuel - which is 85 per cent ethanol.
The SP3 XXR also features a brand new braking system, with Radical partnering with AP Racing for both the discs and calipers. These are set behind a new design of lightweight forged wheel and together they further reduce unsprung weight. Radical did not release a new weight figure, but the quoted power-to-weight ratio of 350bhp/ton suggests a weight of around 662kg – 32kg more than the previous model.
As part of the upgrade, all XXR models will now be fitted as standard with a pit-lane speed limiter, and also come with a new engine cover with an LMP-inspired fin and optional carbonfibre splitter and diffuser additions. The fundamental aero design has not changed, but the standard SR3’s capability to pull 2.3g lateral suggests there’ll be plenty of downforce.
Radical is currently one of the market leaders in the production of high performance track-only cars, having sold 1500 SP3 units for global competition and track day usage. This new model should only bolster the appeal of the SP3 range when it goes into production from February next year.