Embarking on a 1JZ VVTI engine swap can significantly boost your vehicle’s performance. For those looking into this powerful upgrade, you’ll be pleased to know the JZS171 1JZ VVTI swap is remarkably straightforward in terms of physical installation. It’s essentially a direct bolt-in process, minimizing the need for complex modifications, with the exception of fuel lines. This ease of mechanical integration makes the 1JZ VVTI a popular choice for enthusiasts seeking a robust engine upgrade.
However, while the mechanical aspects are user-friendly, the wiring presents a more intricate challenge. Utilizing the JZS171 ECU is key for compatibility, and fortunately, the JZX110 pin diagram serves as an accurate guide for the JZS171 pinout. Be prepared for some meticulous work as you’ll need to repin the body harness. This step, although time-consuming, is crucial for ensuring all systems function correctly with the new engine. Take your time, use the right tools, and proceed methodically. While some wires will be left over and can be safely trimmed and taped off, note that certain factory gauges like coolant temperature and MPG may not function correctly post-swap. External gauges might be necessary for monitoring these parameters accurately. Crucially, understanding the 1jz Obd2 Port integration is vital during this wiring phase to ensure diagnostic capabilities remain intact.
Regarding the transmission, while some might consider using the stock IS300 transmission, the A340LE transmission that comes paired with the 1JZ engine is a robust and suitable option. It’s a 4-speed automatic, which is perfectly adequate for daily driving and performance. If fuel economy is not your primary concern for this build, the A340LE offers strength and reliability. Many find that highway cruising at 80mph remains comfortable at around 3000rpm, with fuel consumption comparable to the original 2JZGE under normal driving conditions. The transmission also supports tiptronic functionality and performs well even at higher RPMs. For enhanced performance, consider a transmission service with a filter change, fresh fluid, new seals, and potentially a 3k stall converter to unleash more of the engine’s potential.
To further optimize engine performance, particularly before considering a larger turbo, a J-pipe delete is highly recommended. To ensure the engine runs optimally, especially after modifications, a piggyback ECU with MAF clamping capability is essential. Alternatively, an airflow straightener can be implemented. These modifications help manage airflow and fuel delivery for peak engine efficiency.
The driveshaft compatibility is another area of ease, as it bolts directly up to the swapped engine, simplifying the installation process. For fuel delivery, upgrading to an Aristo pump hanger is a worthwhile investment. It streamlines the fuel system setup, especially for the return line. Be aware that the fuel light might become erratic after the swap, a minor inconvenience easily addressed with a simple fix like covering the light.
Addressing the air conditioning system, direct compatibility is limited. However, a solution exists through a special control box offered by Yury Baranov, available via Facebook. This box enables the A/C to function, albeit not exactly like the stock system. It effectively manages the ECU to raise the idle and activate the A/C compressor, providing a functional air conditioning solution that has proven reliable in practical use.
In conclusion, while the wiring aspect of the 1JZ VVTI swap demands careful attention, particularly for 1JZ OBD2 port functionality and gauge integration, the rest of the swap is remarkably straightforward. This engine swap delivers a significant performance upgrade that many believe should have been the original configuration. An upgrade to an LSD (Limited Slip Differential) is also highly recommended to fully utilize the added power. With proper planning and execution, this swap can be completed within a weekend. For visual references and build details, you can explore Mikeyracecar’s build on Instagram. Don’t hesitate to ask questions as you undertake this rewarding engine swap.
