The Toyota 1JZ-GTE is a 2.5 liter (2,492 cc, 152.07 cu-in) straight-six, four-stroke cycle turbocharged gasoline engine from the Toyota JZ-family. The engine was manufactured by the Toyota Motor Corporation on the Tahara Plant (Tahara, Aichi, Japan) from 1990 to 2007.
The Toyota 1JZ-GTE engine features a cast-iron block, aluminum cylinder head with dual belt-driven overhead camshafts (DOHC) and four valves per cylinder (24 in total). The 1JZ-GTE is equipped with an electronic fuel injection system, VVT-i (Variable Valve Timing with intelligence) since 1996, ACIS variable-length intake manifold.
The bore and stroke are the same as for the 1JZ-GE: cylinder bore is 86 mm (3.39 in) and piston stroke 71.5 mm (2.81 in), but this engine has a lot of different parts. In addition, the Yamaha Motor company took a great part in the development of this engine.
The first generation of the Toyota 1JZ-GTE had a compression ratio rating of 8.5:1, twin CT12A turbochargers arranged in parallel and blowing through a side-mount or front mount intercooler and was manufactured from 1990 to 1995. This version produced 280 PS (206 kW; 276.2 HP) at 6,200 rpm of maximum horsepower and 363 Nm (37.0 kg·m; 267.9 ft·lb) at 4,800 rpm of peak torque.
The second generation had increased compression ratio rating of 9.0:1, VVT-i system on the inlet camshaft, ETCS system or ETCS-i (for Toyota Chaser JZX110 and Toyota Crown JZS171). This engine belonged to the BEAMS (Breakthrough Engine with Advanced Mechanism System) family of Toyota engines. The engine received a reworked head, modified water jackets for improved cylinder cooling, newly shims with a titanium nitride coating and single CT15B turbocharger. Second generation 1JZ-GTE engine produced 280 PS (206 kW; 276.2 HP) at 6,200 rpm of horsepower and 378 Nm (38.6 kg·m; 279 ft·lb) at 2,400 rpm of maximum torque.
The breakdown of the engine code is as follows:
- 1 – 1-st generation engine
- JZ – Engine family
- G – Performance wide-angle DOHC
- T – Turobchagered
- E – Multi-Point Fuel Injection
General information
| Engine Specifications | |
| Engine code | 1JZ-GTE |
| Layout | Four stroke, Inline-6 (Straight-6) |
| Fuel type | Gasoline |
| Production | 1990-2007 |
| Displacement | 2.5 L, 2,492 cm3 (152.07 cu in) |
| Fuel system | Multi-point fuel injection system |
| Power adder | 1-st gen: Twin CT12A turbochargers 2-st gen: Single CT15B turbocharger |
| Max. horsepower | 280 PS (206 kW; 276.2 HP) at 6,200 rpm |
| Max. torque | 1-st gen: 363 Nm (37.0 kg·m; 267.9 ft·lb) at 4,800 rpm 2-nd gen: 378 Nm (38.6 kg·m; 279 ft·lb) at 2,400 rpm |
| Firing order | 1-5-3-6-2-4 |
| Dimensions (L x H x W): | – |
| Weight | – |
Cylinder block
The Toyota 1JZ-GTE engine has a cast-iron cylinder block, bore is 86.0 mm (3.39 in) and stroke is 71.5 mm (2.81 in). The cylinder block, a monoblock specially cast structure, employs the seven bearing support system. The crankshaft has seven journals and twelve counterweights; both pins and journals were induction-hardened.
The pistons are special aluminum casting. Each piston is fitted with two compression rings and a single oil ring. Compression ratio rating for the first generation of 1JZ-GTE without VVT-i system is 8.5:1, for the second generation (BEAMS) with VVT-i, is 9.0:1.
| Cylinder block | ||
| Cylinder block alloy | Cast-iron | |
| Compression ratio: | 1-st gen: 8.5:1 2-nd gen (BEAMS): 9.0:1 | |
| Cylinder bore: | 86.0 mm (3.39 in) | |
| Piston stroke: | 71.5 mm (2.81 in) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Number of main bearings: | 7 | |
| Cylinder inner diameter (standard): | 86.000-86.013 mm (3.3858-3.3863 in) | |
| Piston skirt diameter (standard): | 85.935-85.945 mm (3.3832-3.3836 in) | |
| Piston pin outer diameter: | 21.997-22.006 mm (0.8660-0.8664 in) | |
| Piston ring side clearance: | Top | 0.011-0.070 mm (0.0004-0.0027 in) |
| Second | 0.020-0.060 mm (0.0008-0.0024 in) | |
| Piston ring end gap: | Top | 0.28-0.40 mm (0.0110-0.0157 in) |
| Second | 0.35-0.45 mm (0.0137-0.0177 in) | |
| Oil | 0.13-0.38 mm (0.0051-0.0150 in) | |
| Crankshaft main journal diameter: | 62.000 mm (2.4410 in) | |
| Crankpin diameter: | 52.000 mm (2.0472 in) | |
| Crankshaft center distance: | 35.75 mm (1.4074 in) | |
Main bearing cap bolts torque specs:
- Step 1: 44 Nm; 4.5 kg·m; 32.5 ft·lb
- Step 2: Turn all bolts 90°
Connecting rods cap bolts torque specs:
- Step 1: 29 Nm (3.0 kg·m; 21.4 ft·lb)
- Step 2: Turn all bolts 90°
Flywheel bolt torque specs:
- Step 1: 49 Nm (5 kg·m; 36.16 ft·lb)
- Step 2: Turn all bolts 90°
Drive plate fixing bolts: 83 Nm (8.5 kg·m; 61.3 ft·lb)
Cylinder head
The cylinder head is made of a light, strong aluminum alloy with good cooling efficiency. Camshafts are made of specially cast steel and are driven by the timing belt. The first generation 1JZ-GTE has the intake valves with 224° of duration, valve lift is 7.69 mm (0.30 in) and the exhaust valve duration is 228°, valve lift is 7.95 mm (0.31 in). The second generation of 1JZ-GTE is equipped with VVT-i system.
The Toyota 1JZ engines are not equipped with hydraulic lifters, so special valve shims are used to adjust the valve clearance.
Cylinder head torque specs:
- Step 1: 35 Nm; 3.6 kg·m; 25.83 ft·lb
- Step 2: Turn all bolts 90°
- Step 2: Turn all bolts another 90°
Maintenance data
| Valve clearance | |
| Intake valve | 0.15-0.25 mm (0.006-0.010 in) |
| Exhaust valve | 0.25-0.35 mm (0.010-0.014 in) |
| Compression pressure | |
| Standard | 12.5 kg/cm2 / 350 rpm |
| Minimun | 9.0 kg/cm2 / 350 rpm |
| Compression differential limit between cylinders | 1.0 kg/cm2 / 350 rpm |
| Oil system | |
| Oil consumption , L/1000 km (qt. per miles) | up to 0.5 (1 qt. per 1200 miles) |
| Recommended engine oil | 5W-30 5W-40 10W-30 |
| Oil type API | SG or SJ |
| Engine oil capacity (Refill capacity) | Without oil filter: 5.1-5.4 l With oil filter: 5.4-5.7 l For JZX90 since oct. 1993 |
| Oil change interval, km (miles) | 10,000 (6,000) |
| Ignition system | |
| Spark plug | 1991-1996 DENSO: PK20R8; NGK: BKR6EP8 1996-2000 (VVTi) After 2000 (VVTi) |
| Spark plug gap | For PK20R8 and BKR6EP8: 0.7-0.8 mm (0.027-0.031 in) For PK20TR11, BKR6EKPB11, SK20R-P11: 1.0-1.1 mm (0.039-0.043 in) |
Valve clearance adjustment data
Calculate the thickness of new adjusting valve lifter so valve clearance comes within specified values.
R = Thickness of removed valve lifter
N = Thickness of new valve lifter
M = Measured valve clearance
Intake:
N = R + [M – 0.20 mm (0.008 in)]
Exhaust:
N = R + [M – 0.30 mm (0.012 in)]
Valve lifters are available in 17 sizes range from 2.50 mm (0.0984 in) to 3.30 mm (0.1181 in), in steps of 0.05 mm (0.0020 in).
Example (intake valve):
R = 2.90 mm
M = 0.40 mm
N = 2.90 + (0.40 – 0.20) = 3.10 mm, so we need a valve shim with thickness of 3.10 mm (0.1220 in).
Vehicle applications
| Model | Years Produced |
| Toyota Chaser 2.5 GT Twin Turbo | – |
| Toyota Cresta 2.5 GT Twin Turbo | – |
| Toyota Mark II 2.5 GT Twin Turbo (JZX81) | – |
| Toyota Chaser Tourer V | – |
| Toyota Cresta Tourer V | – |
| Toyota Mark II Tourer V (JZX90, JZX100) | – |
| Toyota Verossa | – |
| Toyota Mark II iR-V (JZX110) | – |
| Toyota Soarer (JZZ30) | – |
| Toyota Supra MK III (JZA70) | – |
| Toyota Crown (JZS170) | – |
| Toyota Mark II Blit | – |
Author:
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