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Auto APPLICATION 3UZ VVT-i WIRING
What you can Expect:
What You Can Expect
The 3UZ-FE VVT-i engine is a powerful and adaptable platform, making it a great choice for automatic transmission swaps. With proper wiring modifications and ECU programming, this engine can be seamlessly integrated into a variety of vehicles while maintaining full functionality.
✅ Complete Harness Modification for Automatic Applications
When modifying a 3UZ-FE VVT-i harness for automatic use, we ensure that the wiring is streamlined and optimized. Unnecessary components such as redundant transmission wiring are removed, while essential connections for the automatic transmission, sensors, and dashboard signals are retained.
✅ Standalone System Conversion
We integrate a fuse box into the harness, transforming it into a fully standalone system that operates independently of the original vehicle’s wiring. This provides a clean, reliable, and plug-and-play installation.
✅ Harness Refurbishment & Connector Upgrades
Every harness is inspected, and we replace damaged or aging components to ensure long-term reliability. Depending on the condition of your harness, key connectors such as the following may need to be replaced:
✔ Coil connectors
✔ Injector connectors
✔ Cam sensor connectors
✔ OCV connectors
Connector replacements are optional and priced separately, allowing customers to decide based on their specific needs.
✅ Automatic Transmission Integration
We configure the harness to fully support the automatic transmission, including all gear position signals:
🔹 Park, Reverse, Neutral, Drive, 4, 3, 2, Low (for standard automatic transmissions)
🔹 Shift Up & Shift Down signals (for 6-speed transmissions, compatible with lever or paddle-shift setups)
An extension harness is also included, which connects to:
✔ The electronic accelerator pedal
✔ The OBD2 port for live diagnostics and tuning
✅ Immobilizer Removal & ECU Remapping
The 3UZ-FE ECU includes an immobilizer system that must be removed or bypassed for swap applications. We offer this service for $140, ensuring your ECU is fully operational.
For additional customization, we also offer ECU remapping for an extra $140, which:
✔ Clears unnecessary trouble codes (DTCs)
✔ Optimizes fuel and ignition maps for performance and reliability
✔ Disables unnecessary systems such as EVAP and secondary O2 sensors
✅ Simple Vehicle Integration with a Client Plug
Once the harness is complete, it comes with a client plug, making it easy to wire into your vehicle. This consists of:
🔹 Essential wires for engine operation:
✔ Ignition
✔ Start signal
✔ Fuel pump power
🔹 Dashboard signals:
✔ Rev counter (tach signal)
✔ Engine temperature sensor
✔ Charge light
✔ Oil pressure light
✔ Check engine light
🔹 Additional connections (if applicable):
✔ A/C compressor clutch signal
💡 Think of it like connecting a car radio—simple and straightforward!
Pricing
💰 Basic Wiring Modification: $590
(Includes labor for rewiring but does not include connector replacements.)
💰 Immobilizer Removal: $140
💰 ECU Remapping: $140
💰 Connector Replacement: Priced separately based on individual harness needs. (Average cost is around $6 per connector.)
What You Will Receive
Once the harness is complete, you will receive:
✅ A fully rewired, tested harness ready for installation
✅ A video demonstration showing the harness in action
✅ A shared folder containing:
✔ Client plug wiring diagram
✔ Installation notes
✔ Invoice and shipping details
Why Choose the 3UZ-FE VVT-i for Automatic Applications?
✔ High-Performance VVT-i Engine – Advanced timing for better torque, efficiency, and response
✔ OBD2 Diagnostics – Easy troubleshooting & tuning capabilities
✔ Reliable Coil-on-Plug Ignition – More efficient and tunable than distributor-based systems
✔ Strong Transmission Compatibility – Supports 5-speed and 6-speed automatic setups
🚗 We ensure your wiring setup is plug-and-play for a hassle-free engine swap!
If you’re looking for a turnkey wiring solution for your 3UZ-FE automatic swap, we’re here to help. Contact us today to get started!
An example of what you will receive in video:
3UZ VVT-i OEM ECU Reliability
✅ 3UZ-FE ECU: Durability & Customization
The 3UZ-FE ECU is one of the most robust and reliable engine control units available. Despite claims that these units require rebuilding, this is rarely the case. Unlike older Toyota ECUs, the 3UZ ECU is well-shielded against capacitor issues, ensuring long-term reliability.
🔹 Built for longevity – Minimal risk of internal failure
🔹 No capacitor-related issues – Unlike older generations that often require repairs
🔹 Reflashing available – Updates ECU with the latest calibration file when needed
Custom ECU Programming & Remapping
The 3UZ ECU features both read and write memory, making it fully programmable to match your specific swap requirements. In many ways, it offers the flexibility of an aftermarket ECU while retaining Toyota’s OEM reliability.
With our ECU tuning service, we can:
✔ Increase the rev limiter for higher performance applications
✔ Adjust maximum vehicle speed limits
✔ Optimize ignition timing and fueling maps
✔ Disable unnecessary emissions components (EVAP, secondary O2 sensors)
✔ Convert the ECU for manual transmission use
Using a factory 3UZ ECU allows you to retain Toyota’s proven reliability while still gaining the benefits of a tunable system. Whether you're looking for performance enhancements or a manual swap conversion, we provide the necessary programming adjustments to suit your build.
Additional Information
The Toyota 3UZ-FE 4.3L Engine: Specifications and Reliability
The 3UZ-FE engine, introduced in 2000, evolved from the 4.0-liter 1UZ-FE engine. It increased in displacement to 4.3 liters and incorporated all of Toyota's contemporary systems and electronics, similar to the later 1UZ engines equipped with VVT-i.
The 3UZ-FE features an aluminum cylinder block with a bore size increased to 91.0 mm, while the stroke remains unchanged at 82.5 mm. This new block retains the same 90-degree 'V' angle, a 21 mm cylinder bank offset, and a 105.5 mm bore pitch. The updated cast-iron cylinder liners are now 0.5 mm thinner, measuring 1.5 mm instead of 2 mm, which makes the sleeves/liners lighter and improves cooling, albeit with a reduction in strength. To enhance rigidity, the cylinder wall thickness has been increased by 1 mm, from 5.5 mm to 6.5 mm. Engineers have also refined the shape of the water passages between the bores. Similar to the 1UZ-FE, the 3UZ-FE engine is outfitted with a forged steel crankshaft that is fully balanced, featuring five main journals and eight counterweights, along with forged steel connecting rods, and lightweight aluminum pistons with steel struts and floating piston pins. The pistons have not only increased in diameter but also feature a higher position for the piston rings.
The 3UZ-FE cylinder heads are nearly identical to their predecessors. The chamber shape has been modified to accommodate the enlarged cylinder bores. Otherwise, these engine heads resemble the later 1UZ-FE heads equipped with VVT-i. They feature two camshafts (the intake camshaft is driven by a timing belt, while gears on the intake camshaft drive the exhaust camshafts), four valves per cylinder, solid lifters, and large valves (with an intake valve diameter of 34.5 mm, an exhaust valve diameter of 29.0 mm, and a valve stem diameter of 5.5 mm for both).
All 3UZ-FE engines are equipped with the Variable Valve Timing - Intelligent (VVT-i) system and Toyota's variable length intake manifold, known as ACIS (Acoustic Control Induction System). Each cylinder has a compact and lightweight individual ignition coil, an improvement over the 1UZ-FE coils. The engine heads feature iridium-tipped spark plugs centrally located in the cylinders. The 3UZ-FE's ignition is managed by both the DIS (Direct Ignition System) and ESA (Electronic Spark Advance) systems. To expedite the warming of the catalytic converters, the 3UZ-FE utilizes cast steel exhaust headers/manifolds with shorter front exhaust pipes than those in the 1UZ-FE. Modern vehicles necessitate an electronically controlled throttle; hence, the 3UZ-FE incorporates the ETCS-i system (Electronic Throttle Control System), which oversees the idle speed (ISC system), cruise control, traction control (TRAC), and vehicle skid control (VSC) in Toyota cars.
Production of the 3UZ-FE ceased in 2010, and it was replaced by the new generation of Toyota's V8 engines (the UR family), introducing the 4.6-liter V8 engine - the 1UR-FSE/FE.
Engine Specifications:
- Manufacturer: Tahara Plant
- Production Years: 2000-2010
- Cylinder Block Material: Aluminum
- Cylinder Head Material: Aluminum
- Fuel Type: Gasoline
- Fuel System: Fuel Injection
- Configuration: V
- Number of Cylinders: 8
- Valves Per Cylinder: 4
- Valvetrain Layout: DOHC
- Bore: 91.0 mm (3.58 in)
- Stroke: 82.5 mm (3.25 in)
- Displacement: 4,292 cc (261.9 cu in)
- Engine Type: Four-stroke, Naturally Aspirated
- Compression Ratio: 10.5:1
- Power: 282-304 hp (207-223 kW) at 5,600 rpm
- Torque: 307-325 lb-ft (417-441 Nm) at 3,400-3,500 rpm
- Engine Weight: 386 lbs (175 kg)
- Firing Order: 1-8-4-3-6-5-7-2
- Engine Oil Weight: 5W-30
- Engine Oil Capacity: 5.2 liters (5.5 quarts)
- Oil Change Interval: 9,000 miles (15,000 km) or 12 months
- Applications: Lexus LS 430, Lexus GS 430, Lexus SC 430, Toyota Soarer, Toyota Crown Majesta, Toyota Supra GT500
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