Engine durability improvements include longer time between oil changes.
April 26, 2023 at 9:09 a.m. ET
Radical Motorsport introduces the updated SR1 to XXR trim as the first major upgrade to its entry-level racing car in six years. The machine has a redesigned body and an improved engine.
Power comes from the Generation 5 version of Radical Precision Engineering’s 1.34-liter four-cylinder engine. It produces 198.8 horsepower and 120.1 pound-feet of torque. The engine weighs 183 pounds (83 kilograms), which includes the intake manifold, alternator, starter and hood housing. The mill is mated to a six-speed sequential gearbox.
Gallery: Radical SR1 XXR
3 Pictures
Radical says the new engine has benefits for racers. It warms up faster and the oil change interval is now every ten hours, instead of six hours before. A revised oil scavenge pump design aids lubrication.
The car runs on a Nik-link suspension system that has unequal length front and rear wishbones. The pushrods are adjustable and there are interchangeable roll bars.
The revised body gains a fin that runs behind the cockpit to near the wing. Radical says the new element is inspired by LMP endurance racing cars.
Inside, shoppers can get one or two seats. Instruments include an AIM MXS display with a gear indicator, shift light and data logger.
There are several options available. For example, an enhanced data package includes GPS, race recording, brake pressure monitoring and steering sensors. An exhaust muffler allows the SR1 to be used on track days with noise limits.
Radical is taking orders for the SR1 XXR now, but the company isn’t advertising pricing. Production begins in the summer of 2023.
In late 2022, Radical introduced the updated SR3 XXR. It’s the next step up from the SR1 XXR in the brand’s lineup. The engine is a 1.5-liter four-cylinder that makes 232 hp and can run on biofuel. A new braking system has reduced unsprung mass and improved pedal feel. The styling of the revised model also gains a rear fin.
Radical has also updated the SR10 specs to XXR. It received more extensive styling modifications with front grilles in addition to the rear wing. A 2.3-liter turbocharged four-cylinder produces 425 hp.
