Lexus RC F Wallpaper The 2015 Lexus RC-F will come with a naturally aspirated 5.0 liter engine which will output more than 450-horses and over 383 lb-ft (519Nm) of peak torque. For the first time, a performance Lexus unit utilizes the Atkinson cycle (used in hybrid models) at cruising speeds for improved fuel economy before switching to the traditional Otto cycle at higher rpm to boost