sentences:  The road version of the GT1 was fitted with a water-cooled 3.5 L "4-stroke" Lotus "Type 918" "Garrett" twin-turbocharged V8 engine with a power output of 550 PS (542 HP) at 6,500 RPM, attached to the Renault 5-speed manual transmission.The Lotus V8 engine was proven to be unreliable, so in the process, the racing team decided to put the GM's Chevrolet Corvette ZR-1 LT5 V8 engine in the factory track-focused race cars.The car was also fitted with a double wishbone suspension on both front and rear and an aluminum roll cage that was bolted down to the chassis.