The Toyota 2JZ engine boasts numerous advantages. Its inline six-cylinder layout and cast iron block allow it to withstand greater explosive forces, exhibiting excellent wear resistance, vibration damping, and thermal shock resistance, thus offering immense modification potential. Without strengthening any internal engine components, simple modifications such as replacing two small turbochargers with a larger turbocharger and adjusting fuel injection and boost pressure can increase the horsepower from the stock 280 to 400. More advanced modifications can easily achieve over 1000 horsepower.
While cast iron blocks have advantages, they lag behind aluminum alloy blocks in heat dissipation. Therefore, addressing the cooling issues of high-horsepower engines requires a more powerful and efficient cooler. Simultaneously, achieving high horsepower output necessitates upgrades to the turbocharger, internal reinforcement, fuel supply system, and ignition system.
Furthermore, the difference in intake volume between cylinders 1 and 6 in an inline six-cylinder layout affects combustion efficiency and can potentially cause cylinder head vibration; therefore, modifications to the intake manifold are also crucial in modifications.
The Toyota Supra's 2JZ engine is a 3.0-liter inline 6-cylinder twin-turbocharged engine. Due to the gentleman's agreement among Japanese automakers, its maximum horsepower is limited to 280 hp. However, with a small investment, the power can be easily increased to 700 hp or even higher without modifying the engine.