Toyota UZ engine

The Toyota UZ engine family is a gasoline fueled 32-valve quad-camshaft V8 piston engine series used in Toyota's luxury offerings and sport utility vehicles.
Three variants have been produced: the 1UZ-FE, 2UZ-FE, and 3UZ-FE. Production spanned 24 years, from 1989 to mid 2013, ending with the final production of the 3UZ-FE-powered Toyota Crown Majesta I-FOUR. Toyota's UZ engine family was replaced by the UR engine family.

1UZ-FE

The all-alloy 1UZ-FE debuted in 1989 in the first generation Lexus LS 400/ Toyota Celsior and the engine was progressively released across a number of other models in the Toyota/Lexus range. The engine is oversquare by design, with a bore and stroke size of . It has proven to be a strong, reliable and smooth powerplant with features such as 6-bolt main bearings and belt-driven quad-camshafts. The water pump is also driven by the timing/cam belt. The connecting rods and crankshaft are constructed of steel. The pistons are hypereutectic.

The FV2400-2TC derivative is one of the few road-going engines that is FAA approved for use in an airplane.

Its resemblance to a race engine platform (6 bolt cross mains and over square configuration) was confirmed in 2007 by David Currier (in an interview with v-eight.com), vice president of TRD USA, stating that the 1UZ platform was based on CART/IRL engine design. It was planned to be used on GT500 vehicles, however its subsequent use in the Daytona Prototype use had not been planned.

In its standard, original trim with 10.0:1 compression, power output is , torque of .

The engine was slightly revised in 1995 with lighter connecting rods and pistons and an increased compression ratio to 10.4:1 resulting in peak power of at 5,400 rpm and torque of at 4,400 rpm.

In 1997, Toyota's VVT-i variable valve timing technology was introduced along with a further compression ratio increase to 10.5:1, bumping power and torque to at 5,900 rpm and at 4,100 rpm. For the GS400, output was rated at at 6,000 rpm and at 4,000 rpm.

The 1UZ-FE was voted to the Ward's 10 Best Engines list for 1998 through 2000.

Applications (calendar years):
* 1989–2000 Lexus LS 400/Toyota Celsior
* 1989–2002 Toyota Crown/Toyota Crown Majesta
* 1989–2004 Toyota HiAce HiMedic Ambulance (Japan only)
* 1991–2000 Lexus SC 400/Toyota Soarer
* 1992–1997 Toyota Aristo
* 1997–2000 Lexus GS 400
* 1995–1997 SARD MC8/MC8-R

2UZ-FE

The 2UZ-FE was a version built in Tahara, Aichi, Japan and at Toyota Motor Manufacturing Alabama. Unlike its other UZ counterparts, this version uses a cast iron block to increase durability, as it was designed for low-revving, high-torque pickup and SUV applications. Its bore and stroke is . Output varies by implementation, but one VVT-i variant produces at 4800 rpm with of torque at 3400 rpm. JDM versions produce at 4800 rpm and at 3600 rpm, while Australian models produce at 4800 rpm and at 3600 rpm.

Like the 1UZ-FE, it has aluminum DOHC cylinder heads, MFI fuel injection, 4 valves per cylinder with bucket tappets, one-piece cast camshafts, and a cast aluminum intake manifold. For 2010, it was replaced by the 1UR-FE or 3UR-FE, depending on the country.

Applications (calendar years):
* 2002–2004 Lexus GX 470
* 1998–2005 Lexus LX 470
* 1998–2005 Toyota Land Cruiser
* 2002–2004 Toyota 4Runner
* 1999–2004 Toyota Tundra
* 2000–2004 Toyota Sequoia

Toyota Racing Development offered a bolt-on supercharger kit for the 2000–2003 Tundra/Sequoia and the 1998–2003 LX 470.

Another 2UZ-FE variation adds VVT-i, electronic throttle control, and a plastic intake manifold.

Applications (calendar years):
* 2004–2009 Lexus GX 470
* 2005–2007 Lexus LX 470
* 2005–2009 Toyota 4Runner
* 2005–2011 Toyota Land Cruiser
* 2005–2009 Toyota Tundra
* 2004–2009 Toyota Sequoia
* 2007–2012 Lexus LX 470 (Hong Kong only)

3UZ-FE

The 3UZ-FE is a version built in Japan. Bore and stroke is
. Output is at 5600 rpm with of torque at 3400 rpm. The engine block and heads are aluminum. It has a DOHC valvetrain with 4 valves per cylinder and VVT-i. It uses SEFI fuel injection. In 2003, the engine was paired with a six-speed automatic transmission, resulting in improved fuel economy over the previous five-speed automatic.

A 4.5L version replaced the 3S-GTE as the engine used in Toyota's Super GT race cars up to 2009 and a 5.0L version was used in the Grand American Road Racing (Grand Am) Series.

Applications (calendar years):
* Lexus LS 430 (2000–2006)
* Lexus GS 430 (2000–2007)
* Lexus SC 430/Toyota Soarer (2001–2010)
* Toyota Crown Majesta (2004–2013)
* Hongqi HQ430 (2006–2010)
* Super GT
** GT500 Race Car
** Lexus SC 430 GT500 Race Car (2006–2008)

Derivatives

FV2400-2TC

In 1997, the US Federal Aviation Administration granted production certification for the FV2400-2TC, a twin-turbocharged airplane powerplant based on the 1UZ-FE. The FV2400 was developed in partnership with Hamilton Standard, which provided the digital engine-control system. The goal was to produce a four-seat propeller aircraft.

VT300i

In 1998, a marine derivative of the UZ powerplant was produced for boating applications. The 4.0 L VT300i engine, producing at 6000 rpm and at 4200 rpm, used the same block as the UZ engine on the Lexus SC 400, GS 400, and LS 400.

Applications (calendar years):
*1998 Toyota Epic S21
* 1999–2001 Toyota Epic S22/SX22
* 1999–2001 Toyota Epic X22

References

See also

{{Commons category, Toyota UZ engines
* List of Toyota engines

UZ
V8 engines
Gasoline engines by model