1JZ Non-VVTi Twin Turbo JDM Engine & R154 5-Speed Manual Transmission Swap ECU + Wiring Harness

Vehicle Specifications

• Engine Code: 1JZ-GTE (Non-VVTi)

• Displacement: 2.5L Inline-6

• Induction: Parallel Twin-Turbo (CT12A)

• Transmission: R154 5-Speed Manual (Inspection plate & shifter included)

• Horsepower: 280 hp @ 6,200 rpm (Stock JDM rating)

• Torque: 268 lb-ft @ 4,800 rpm

• Block Material: Cast Iron (Legendary for high boost handling)

Vehicle Fitments

This JDM 1JZ-GTE swap kit is a popular "drop-in" or "custom-mount" solution for the following North American (USDM) models:

• 1992-2000 Lexus SC300 (Direct fit with JZZ30 mounts)

• 1986.5-1992 Toyota Supra (MK3) (Requires R154 conversion parts)

• 2001-2005 Lexus IS300 (Custom mounts and wiring required)

• 1989-1998 Nissan 240SX (S13/S14) (Requires aftermarket swap mounts and driveshaft)

   

Note: This is a front-sump/mid-sump configuration depending on the donor vehicle. Please verify your chassis oil pan requirements prior to purchase.

Installation & Technical Notes

The 1JZ-GTE is a tuner's dream, but 30-year-old electronics require precision. To ensure a successful startup and maintain warranty coverage, follow these guidelines:

• Wiring Harness & ECU: This package includes the JDM ECU and engine harness. Note: JDM harnesses are RHD (Right Hand Drive). For LHD USDM chassis, harness extension or an aftermarket "Plug-and-Play" harness is highly recommended to avoid firewall interference.

• R154 Transmission Prep: The R154 is a heavy-duty box, but we recommend replacing the throw-out bearing, pilot bearing, and clutch disc before installation. Check the shifter housing length (Tripod vs. Direct) to ensure it clears your center console.

• Twin Turbo Inspection: Inspect the CT12A turbochargers for shaft play. Because these use ceramic exhaust wheels, avoid exceeding 14.5 PSI (1.0 bar) on stock turbos to prevent wheel shattering.

• Essential Maintenance: We strongly recommend replacing the following "While-You're-In-There" parts:

  • Timing Belt & Tensioner: Replace with a Gates Racing or OEM Toyota belt.

  • Water Pump: Replace with the "1JZ/2JZ" specific metal impeller pump.

  • Valve Cover Gaskets: These are prone to leaking oil into the spark plug valleys over time.

  • Spark Plugs: NGK BKR7E (Gap at .028") for stock to moderate boost.

• Fueling: This engine requires a high-flow aftermarket fuel pump (Walbro 255/AEM 340) and 91+ Octane fuel to prevent detonation under boost.