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manual APPLICATION 3UZ VVT-i WIRING

What you can Expect:

3UZ-FE Wiring – Supported Platform

The 3UZ-FE engine is highly regarded for its performance and reliability, surpassing both the 1UZ-FE and 1UZ VVT-i in power output and efficiency. Its ECU can be reprogrammed to suit specific engine swap requirements, allowing for:
✅ Transmission removal for manual applications
✅ Enhanced power output through tuning
✅ Improved throttle response

This makes the 3UZ-FE an outstanding engine choice for modern swaps, offering flexibility and excellent performance potential.

What You Can Expect from Our Service

✅ Complete Standalone Wiring Conversion
When converting a 3UZ-FE for manual applications, we:

Remove unnecessary wiring related to the valve bank, selector switch, speed sensors, and transmission oil temperature sensor, which are not needed in a manual swap.
Integrate an engine temperature sensor wire to connect to your instrument cluster gauge.
Inspect and replace damaged split tubing, then wrap the entire harness in high-quality fabric tape for durability and a clean finish.
Rewire the two connectors originally from the donor vehicle's ECU, incorporating them into the harness.
Install a fuse box, making the harness a fully standalone system.

✅ Client Plug for Easy Vehicle Integration
Three connectors are installed in the harness for simple vehicle integration:

Main Client Plug Includes:
- Start signal, fuel pump power supply, and crank signal (essential for engine operation).
- Dashboard signals:
  - Engine temperature
  - Rev counter signal
  - Oil pressure light
  - Engine light
  - Charge light
- A/C clutch wiring (if applicable)

✅ Electronic Accelerator & OBD2 Support
An extension harness is provided to connect to:

Electronic accelerator pedal for proper throttle-by-wire operation.
OBD2 connector for live data and programming, allowing easy diagnostics and tuning.

Pricing

💰 Base Price for 3UZ Wiring Service: $590
(This covers the wiring modifications but does not include connector replacements.)

💰 Immobilizer Removal: $140
(All 3UZ-FE ECUs have an immobilizer that must be removed or bypassed for standalone use.)

💰 ECU Remapping (Optional): $140

Clears automatic transmission-related DTCs
Eliminates non-relevant diagnostic trouble codes (DTCs) for engine swaps
Optimizes performance settings

💰 Connector Replacements: Priced separately based on individual harness needs.

Some engines require more connector replacements than others.
The decision to replace connectors is up to the customer.
On average, connectors cost around $6 each installed.

Testing & Documentation

Once the harness modifications are complete, we:
✅ Test the harness on a start stand to confirm all system functions are operational.
✅ Perform a system scan to verify that all components are working properly.
✅ Create a video walkthrough and test run to document the harness functionality.
✅ Provide a shared folder containing:

Test-run video
Shipping details & tracking information
Invoice & payment confirmation
Welcome pack with installation notes
High-quality images of the completed harness

This ensures transparency and peace of mind, allowing you to install your harness with confidence.

Why Choose the 3UZ-FE?

🔹 Higher Performance Over 1UZ-FE & 1UZ VVT-i – More power, better efficiency, and improved throttle response.
🔹 Programmable ECU – Can be tuned for power gains, transmission removal, and optimized performance.
🔹 Modern Throttle-by-Wire System – Integrated electronic accelerator pedal support.
🔹 OBD2 Compatibility – Allows for live data, diagnostics, and easier troubleshooting.

Final Notes

The 3UZ-FE is one of the best Toyota V8 swaps available, and we take great pride in ensuring your wiring setup is flawless, fully tested, and ready for installation.

For a clean, hassle-free, and tested wiring solution for your 3UZ-FE swap, contact us today to get started! 🚗⚡

An example of what you will receive in video:

3UZ Wiring for Manual Application (youtube.com)

3UZ VVT-i OEM ECU Reliability

3UZ-FE ECU Reliability & Programming

The 3UZ-FE ECUs are highly durable and rarely require rebuilding. Unlike some older Toyota ECUs, these units are well-shielded against capacitor failures and do not suffer from common hardware degradation issues.

Why the 3UZ ECU is a Superior Choice

🔹 No Need for Rebuilding – Despite some claims that these ECUs need rebuilding, this is rarely the case. They are engineered for longevity and typically function flawlessly for the lifetime of the engine.

🔹 Fully Programmable (Read & Write Memory) – Unlike many older Toyota ECUs, the 3UZ ECU supports both reading and writing, allowing it to be custom-tuned for an engine swap.

🔹 OEM Reliability with Aftermarket-Like Flexibility – These ECUs offer Toyota’s legendary durability while also allowing for the same type of performance tuning found in aftermarket ECUs.

Custom ECU Programming & Remapping Capabilities

The 3UZ ECU can be fully remapped to tailor it specifically for your engine swap and performance needs. Custom programming allows for:
✅ Rev limiter adjustments
✅ Maximum vehicle speed changes
✅ Timing and fueling modifications
✅ Performance optimization for better power output and throttle response
✅ Manual transmission conversion – Removing automatic transmission-related settings for a smooth manual swap

Why Choose the 3UZ ECU for Your Swap?

✅ Toyota's reliability with aftermarket-like tuning capabilities
✅ Fully programmable without requiring an aftermarket ECU
✅ Compatible with modern tuning tools and OBD2 diagnostics
✅ Eliminates unnecessary components for clean, optimized swaps

For those looking to maximize the performance of their 3UZ swap, a properly tuned ECU can make a significant difference in drivability and power delivery.

If you’re interested in ECU remapping, immobilizer removal, or performance tuning, contact us today to discuss your needs! 🚗⚡

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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