The 1JZGTE VVTI engine, renowned for its power and reliability, is a popular swap choice for Lexus IS300 owners. This guide offers a comprehensive overview of the process, focusing on the OBD2 variant of the engine. We’ll cover key aspects of the swap, including wiring, transmission compatibility, fuel system modifications, and air conditioning solutions.
Wiring: The Core of the 1JZGTE VVTI OBD2 Swap
Wiring is arguably the most challenging aspect of this swap. Utilizing the JZS171 ECU, the JZX110 pin diagram directly corresponds to the JZS171 pinout. However, be prepared for a meticulous task: repinning the body harness. While not inherently difficult with the right tools, it requires patience and attention to detail. Expect numerous leftover wires – simply cut and tape them back. Unfortunately, coolant temperature and MPG readings won’t function correctly, necessitating external gauges.
Transmission Options: Stick with the 1JZ’s A340LE
While some consider using the stock IS300 transmission (A340E), the 1JZGTE’s accompanying A340LE is a more robust and suitable option. Despite being a 4-speed automatic, it offers ample performance for this application. With a simple filter and fluid change, seal replacement, and the addition of a 3000 RPM stall converter, the A340LE will handle the increased power output of the 1JZGTE with ease. Daily driving at highway speeds yields acceptable RPMs, around 3000 RPM at 80 mph, and fuel economy comparable to the stock 2JZGE engine under normal driving conditions.
Intake and Exhaust Modifications
For optimal performance, consider deleting the J-pipe. To achieve smooth running, a piggyback system with MAF clamping capabilities or an airflow straightener is highly recommended, especially with the stock turbo. If upgrading to a larger turbo, these modifications become less critical.
Drivetrain and Fuel System Upgrades
The driveshaft bolts directly to the 1JZGTE, simplifying the process. For fuel delivery, upgrading to the Aristo fuel pump hanger is strongly advised. Utilize the 5/6th line for the return. Expect the fuel light to flash; a simple solution is to cover it with tape.
Air Conditioning: Overcoming Compatibility Issues
The factory air conditioning system will not function without modification. A custom solution, often provided by aftermarket specialists like Yury Baranov, is required to enable A/C functionality. This typically involves a control box that manages the A/C compressor and ECU idle-up.
Conclusion: A Rewarding but Demanding Swap
The 1jzgte Vvti Obd2 swap offers a significant performance upgrade for the Lexus IS300. While wiring presents the biggest challenge, with careful planning and execution, the entire process can be completed in a weekend. Remember to source an LSD for optimal traction. This comprehensive guide provides a solid foundation for a successful swap. With the right preparation and dedication, you’ll be enjoying the exhilarating power of the 1JZGTE in your IS300.
