Under the bonnet is a supercharged 5.0-litre V8, putting out 542bhp. It's the same engine used in the other flagship performance Jaguars: the XKR-S and XFR-S. The XJR romps to 60mph in 4.4sec and hits an electronically limited 174mph top speed. The car rides on forged 20-inch alloy wheels and wears a subtle body kit which Jaguar claims provides aerodynamic benefit as well as a sportier look.
Power is sent to the rear wheels only via an eight-speed paddleshift auto gearbox. For the R model, the XJ's active differential and electronic nannies have been reprogrammed to cope with the extra power. Suspension settings have been tuned at Jaguar's Nurburgring-based development centre, and the steering has been tweaked using technology from the F-type sports car.
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