Radical Motorsport, a boutique carmaker based in the United Kingdom, has unveiled the all-new SR3 XXR. The latest iteration of the popular model has been enhanced in just about every way, including a new 1.5-liter engine developing 232 hp and capable of running on E85 biofuel, a first for Radical.
That power output doesn't sound like much but, thanks to the lightweight construction, Radical claims it provides around 350 hp per tonne. No weight figure has been provided, although the aforementioned claim suggests it tips the scales around the 1,455-lb mark. To put that into perspective, a Mazda MX-5 Miata weighs 2,341 lbs.
Radical is yet to specify any performance figures. However, previous models - like the SR3 XX - can sprint to 60 mph in 3.1 seconds with less power.
Key changes to the powerplant include improvements to the cylinder head, where flow rate and flow consistency have been enhanced. The connecting rods, ignition system, and crankshaft pins have also been lightened. Overall, Radical claims improved power, torque, and uncompromised durability - all of which can be felt between 6,500 rpm and 10,000 rpm.
It's not just the engine that has been substantially upgraded, though.
In order for the SR3 XXR to run on E85 biofuel, Radical has fitted a new fuel composition sensor, along with a new scavenge pump design that improves flow. These vehicles tend to be driven hard on racetracks across the world and, as such, durability is just as important as performance. To that end, the firm has implemented a number of durability updates.
The vehicle also makes use of external gear position sensors for the transmission. Engine and gearbox calibration has also been reworked.
With greater performance comes a superior braking system from AP Racing with reduced unsprung mass and improved pedal feel - both important qualities in a track weapon.
A particularly handy feature comes in the form of a pit lane speed limiter. With this nifty feature, Radical says the threat of being penalized for speeding through the pit lane is virtually non-existent.
Aerodynamic improvements include the LMP-inspired central tail, which aids stability through the bends.
Design is of little importance with vehicles like this, but that hasn't stopped the automaker from having a go. New lightweight wheels and LED daytime running lights add some modernity to the overall look.
If you're looking for an even more aggressive look, a carbon fiber splitter and rear diffuser will be made available as an option.
"The SR3's handling is renowned as a masterpiece, so for XXR, we took the approach of evolutionary improvements across multiple areas," says James Pinkerton, head of R&D and a two-time Radical Cup UK Champion. " He says that from customer feedback and extensive scrutinization, improvements were made. "We've carried over the sidepod profile from the SR10 to improve airflow and reduce turbulent drag, and of course the new Generation 5 RPE engine is undoubtedly the star of the show."
Radical is already taking orders for the SR3 XXR, with production expected to commence in February 2023. Pricing is yet to be announced, but we don't expect it to come cheap.