Toyota 1UZ
Toyota 1UZ-FE Engine
Toyota 1UZFE engine specs
| Manufacturer | Tahara Plant |
| Also called | Toyota 1UZ |
| Production | 1989-2002 |
| Cylinder block alloy | Aluminum |
| Configuration | V8 |
| Valvetrain | DOHC 4 valves per cylinder |
| Piston stroke, mm (inch) | 82.5 (3.25) |
| Cylinder bore, mm (inch) | 87.5 (3.44) |
| Compression ratio | 10 10.4 10.5 (VVTi) |
| Displacement | 3969 cc (242.2 cu in) |
| Power output | 188 kW (256 HP) at 5,400 rpm 192 kW (261 HP) at 5,400 rpm 213 kW (290 HP) at 5,900 rpm (VVTi) 220 kW (300 HP) at 6,000 rpm (VVTi) |
| Torque output | 353 Nm (260 lb·ft) at 4,400 rpm 365 Nm (269 lb·ft) at 4,400 rpm 407 Nm (300 lb·ft) at 4,100 rpm (VVTi) 420 Nm (310 lb·ft) at 4,000 rpm (VVTi) |
| Redline | 6,200 6,500 (VVTi) |
| HP per liter | 64.5 65.8 73.1 75.6 |
| Fuel type | Gasoline |
| Weight, kg (lbs) | 165 (364) |
| Fuel consumption, L/100 km (mpg) -City -Highway -Combined |
for Lexus LS400 17.4 (13) 9.2 (25) 12.2 (19) |
| Turbocharger | Naturally aspirated |
| Oil consumption , L/1000 km (qt. per miles) |
up to 1.0 (1 qt. per 750 miles) |
| Recommended engine oil | 5W-30 5W-40 10W-30 10W-40 10W-50 15W-50 |
| Engine oil capacity, L (qt.) | 5.0 (5.3) |
| Oil change interval, km (miles) | 5,000-10,000 (3,000-6,000) |
| Normal engine operating temperature, °C (F) | – |
| Engine lifespan, km (miles) -Official information -Real |
– 400,000+ (250,000) |
| Tuning, HP -Max HP -No life span loss |
500+ – |
| The engine is installed in | Toyota Crown Lexus GS 400 / Toyota Aristo Lexus LS 400 / Toyota Celsior Lexus SC 400 / Toyota Soarer Toyota Crown Majesta |
Toyota 1UZ-FE engine reliability, problems and repair
The engine 1UZ is the founder of Toyota UZ (included 2UZ and 3UZ). It appeared in 1989 and intended for the largest models of Toyota and Lexus. This 4-liter engine replaced the old Toyota 5V. Both of them gained reputation the one of the most reliable Toyota engines with huge motor potential.
The cylinder block 1UZ-FE aluminum 90° V8, with pressed thin cast-iron sleeves. Rods length in 1UZFE is 146 mm. Two aluminum heads, twin cam engine with 4 valves on the cylinder. Hydraulic lifters are absent so 1UZ needs periodic adjustment of valves. The firing order for the Toyota 1UZ engines is 1-8-4-3-6-5-7-2. On the stock engine 1UZFE injector size are 220 cc/min.
Since 1995 the engine was a little updated. The differences are following: the lightweight rods (their weight 581 g, against 628 g, in first version) and high compression pistons (CR=10.4). Power increased to 260 HP. Stock size of fuel injectors 1UZ-FE: 251 cc/min. Since 1997 1UZ-FE got VVTi system (intake cams), inlet ports changed, diameters of inlet and exhaust valves increased, cylinder head gasket changed, the long 2-stage intake manifold (ACIS) applied, the ignition system modernized. Also in 1UZ-FE VVTi are used new pistons increased to 10.5 compression ratio, and electronic throttle body.
All 1UZFE engine generation use a timing belt. Its lifespan is 50,000-60,000 miles of mileage (100,000 km). In all updates without variable valve timing system (VVTi), at break of timing belt, valves won’t be bent.
Production of this engine lasted till 2002 then it was replaced on 4.3-liter 3UZ-FE.
Toyota 1UZ engine problems and malfunctions
Its difficult to find faults in 1UZ. This motor has no any design errors, disadvantages or troubles. All problems in 1UZ are connected with age of vehicle, a manner of operation or low-quality maintenance. Using low-quality spark plugs can quickly fail. Their replacement isn’t so simple as it seems. As a result, 1UZ-FE it is extremely reliable. This engine can pass more than 300,000 miles of mileage (500,000 km) without overhaul. The motor 1UZ-FE is often used for construction a drift cars from usual Celica, BMW E36, Nissan 240SX, Toyota AE86, GT86.
Toyota 1UZ-FE engine number location
Here is the number of your motor.
Toyota 1UZ engine tuning
1UZ Supercharger
Don’t waste time and money to make NA tuning with ITB or stroker. It will be better to buy supercharger kit for 1UZ based on the Eaton M90 (or something similar). Such options have included everything you need. But may by you have to buy in addition a fuel pressure regulator. If you additionally install headers and performance exhaust systems, it gives a little more power.
On stock internals at max stock boost 6 psi (0.4 bar), the 1UZ motor can develop up to 330 horsepower. It is the most reliable and popular performance tuning for 1UZ. You will get more power if you buy forged low compression pistons (CR=8.5), connecting rods, ARP studs, intercooler, injectors from 2JZ-GTE, Walbro 255 lph fuel pump, performance exhaust systems 3″, VEMS ECU. Setting all of that and increasing the max boost up to 10 psi (0.7 bar), yours 1UZFE will give out more than 400 horsepower.
1UZ Turbo
Using all described above instead of the supercharger, you can install a turbocharger. For these purposes, you can buy single turbo kit (Garrett GT40). Or you can buy turbocharger, turbo manifold, intercooler separately. You will also need a multi-layer steel head gaskets, wastegate, blow off, boost controller, oil feed line, oil return line, thermal insulation, fuel injectors 7M-GTE (440 cc/min), pipes, clamps, VEMS ECU. After assembly 1UZ will show more than 450 horsepower.
1UZ Twin turbo
Similar performance upgrade you can make on the basis of two Garrett VNT25. Such sets are easy to buy and install on forged pistons. It can provide more than 500 horsepower. In any of these cases you can use more powerful turbochargers, to do head porting, to increase the boost pressure to the limit and get 1000 horsepower.
