At the beginning it was available with only two engine options in Europe: a 1.4 liter 8-valve (75 hp, 114 Nm) and a 1.4 liter 16-valve (98 hp, 127 Nm), both of them with multi-point fuel injection.
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A larger capacity Garrett T3 turbocharger with improved air flow and bigger inter-cooler to aid volumetric efficiency, together with revised settings for the electronic injection/ignition control unit and a knock sensor, boost power output to 185 bhp (DIN) (136 kW) at 5300 rpm and maximum torque of 31 m·kgf (304 N·m, 224 lbf·ft) at 3500 rpm.
Weighing 900 kg, and powered by a 7 L 60 degree SOHC V12 developing 730 hp / 545 kW @ 7000 rpm, and 579 ft.-lb. / 785 N·m @ 5500 rpm, the XJR-12 could hit 368 km/h / 229 mph.