Radical has updated its entry-level track car to create this SR1 XXR
A new engine, improved aero and better reliability for Radical’s lightweight racer
Fresh off the back of updates to its SR3 and SR10 racers, Radical has provided its entry-level SR1 with the same XXR treatment. Track day fans, listen up...
The SR1 XXR represents the biggest upgrade to the smallest Radical since it was first launched back in 2012. There’s a new engine for one thing – Radical’s own ‘Generation 5’ liquid-cooled four-pot.
We don’t have any numbers for the new Gen 5 engine, but the previous SR1 had 182bhp to shift its 490kg and the update mainly focuses on "ease of use and durability" so expect the power-to-weight ratio to remain roughly the same. Handily, Radical tells us that engine refresh intervals increase by 25 per cent with this new power unit though, while oil change intervals increase from six to 10 hours and the warm-up time is reduced.
The small aero adjustments come in the form of that LMP-inspired central fin that’s mounted behind the cockpit and in front of the giant rear wing. There’s also a "reduction in mass for the connecting rods, crankshaft pins and the ignition system," says Radical, and a recalibration of the six-speed sequential gearbox.
As before, the SR1 gets semi-slick tyres, fibreglass bodywork, a limited-slip diff, fully adjustable suspension and a dash-mounted brake bias adjuster. Very cool. The XXR is still able to race in 12 official Radical championships around the world too. Anyone else reckon a TG entry should be on the cards?
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