Answers. Best Answer: I'll give a somewhat broad description since I am not a Toyota engine pro. The 1JZ is a naturally aspirated 2.5L inline-6 and the 1JZ-GTE is the twin-turbocharged version of the 1JZ.Both engines are a 4-valve DOHC 6.nswers. Best Answer: I'll give a somewhat broad description since I am not a Toyota engine pro. The 1JZ is a naturally aspirated 2.5L inline-6 and the 1JZ-GTE is the twin-turbocharged version of the 1JZ.