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Toyota 1G-GTE Specifications
| Engine Model: Toyota 1G-GTE |
| Engine Type: 4-cycle 6-cylinder 24-valve DOHC EFI-TCCS twin-turbocharged gasoline |
| Total Displacement: 123.4 cu.in (1.99 L) |
| Rated Engine Power: 185-210 Hp (138-157 kW) at 6200 rpm |
| Fuel System Type: Multi-point electronic fuel injection |
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| General Technical Data |
The Toyota 1G-GTE is a 2.0-liter inline
six-cylinder twin-turbocharged gasoline engine produced by Toyota Motor
Corporation between 1985 and 1992. It belongs to the well-known 1G
engine family, designed primarily for performance and smoothness in
Toyota’s mid-size and luxury vehicles. The 1G-GTE was a technologically
advanced engine for its era, combining twin parallel turbochargers with
a DOHC 24-valve cylinder head to achieve a balance of power, refinement,
and reliability. It was installed mainly in the Toyota Supra, Soarer,
Chaser, Cresta, and Mark II models. This engine was notable for its
compact dimensions, strong cast-iron block, and aluminum alloy cylinder
head, offering exceptional high-rev characteristics and excellent
response due to the small twin-turbo layout.
Engine type: inline 6-cylinder, twin turbocharged, DOHC, 24-valve
gasoline engine. Displacement is 1988 cc (2.0 liters or 123.4 cubic
inches). Bore is 75.0 mm (2.95 inches), and stroke is 75.0 mm (2.95
inches), giving the engine a perfectly square design. Compression ratio
varied slightly by generation, ranging from 8.5:1 in early versions to
9.0:1 in the later Gen 3 variant. The firing order is 1-5-3-6-2-4, and
the direction of rotation is clockwise viewed from the front.
The cylinder block is made of cast iron for durability and rigidity,
while the cylinder head is an aluminum alloy casting with crossflow port
design for efficient breathing and cooling. Each cylinder head carries
dual overhead camshafts driven by a toothed timing belt, operating four
valves per cylinder through bucket-type tappets with shim adjustment.
Camshaft lift and duration are optimized for midrange torque and
high-rpm performance. The redline is approximately 7200 rpm.
Peak output varies between versions: the first generation (1985–1986)
developed about 185 horsepower (138 kW) at 6200 rpm and 240 Nm (177
lb-ft) of torque at 3800 rpm. The second generation (1986–1988)
delivered 210 horsepower (157 kW) at 6200 rpm and 275 Nm (203 lb-ft) at
3800 rpm. The final third generation (1988–1992) achieved 210 horsepower
(157 kW) with improved torque delivery due to more efficient
turbochargers and intercooling. The specific output thus averaged
approximately 105 horsepower per liter. Engine management utilized an
early version of Toyota’s electronic fuel injection and ignition control
system (EFI-TCCS). Boost pressure in stock configuration was about 0.6
bar (8.7 psi).
| Fuel System |
The 1G-GTE uses an electronic multi-point fuel injection system controlled by the TCCS engine control unit. Each cylinder has its own injector mounted near the intake valve, ensuring precise atomization and consistent fuel delivery. Fuel is supplied by an electric in-tank pump through a pressure regulator maintaining about 300 kPa (43 psi) at idle. The intake manifold is cast aluminum with equal-length runners feeding each cylinder. Twin CT12 turbochargers are mounted on a cast-iron exhaust manifold, operating in parallel to minimize lag and provide smooth boost transition.
The intake charge passes through an air-to-air intercooler before entering the manifold. The fuel system is designed for unleaded gasoline with octane rating of at least 95 RON (90 AKI). A cold-start injector enriches the mixture during cold operation, while the ECU manages idle speed, fuel cut-off, and acceleration enrichment. Oxygen sensors and a throttle position sensor provide feedback to maintain optimal stoichiometry under various load conditions.
| Lubrication System |
The lubrication system is of the wet sump type with a trochoid-type oil pump driven by the crankshaft. Oil pressure at normal operating temperature is approximately 300 to 400 kPa (43 to 58 psi) at 3000 rpm. Total oil capacity including filter is 4.5 liters (4.8 US quarts). The recommended viscosity range is SAE 10W-30 or 10W-40 depending on climate. Oil filtration is achieved through a full-flow spin-on cartridge filter. The system includes oil jets directed at the undersides of pistons for cooling, a critical feature in turbocharged engines.
The crankshaft, connecting rods, and camshaft journals are fed through a pressurized gallery network within the block. An oil cooler integrated into the filter base or remote-mounted depending on model maintains proper temperature under high-load conditions. Oil change intervals are typically every 5000 km (3000 miles) under severe use or 10000 km (6000 miles) under normal conditions. The PCV system returns crankcase vapors into the intake to maintain emissions compliance.
| Cooling System |
The 1G-GTE employs a liquid-cooling system with a belt-driven centrifugal water pump and crossflow aluminum radiator. The cooling capacity is approximately 7.0 liters (1.85 US gallons). A thermostat begins to open at 82°C (180°F) and is fully open at about 95°C (203°F). An electric radiator fan or viscous clutch fan ensures airflow when stationary. The coolant passages in the block and head are designed to evenly distribute temperature, reducing hot spots under high boost conditions.
The turbochargers are oil- and water-cooled to prevent heat soak and maintain reliability. The radiator cap maintains a system pressure of about 88 kPa (13 psi), raising the boiling point of the coolant to approximately 120°C (248°F). Coolant should be replaced every two years or 40000 km (25000 miles) using an ethylene glycol-based mixture at a 50/50 ratio.
| Other Systems |
The ignition system is electronically controlled with a distributorless setup on later models, while early ones used a conventional distributor. Spark plugs are typically NGK BCPR6EP or equivalent with a gap of 0.8 mm (0.031 inches). The charging system consists of a 12-volt alternator rated around 70 amperes. The starting system uses a gear reduction starter motor. The engine control system (TCCS) monitors inputs from sensors including manifold pressure, intake air temperature, coolant temperature, throttle position, and crankshaft angle.
A knock sensor retards ignition timing under detonation conditions. The exhaust system features twin cast-iron manifolds merging into dual turbochargers, then combining into a single downpipe through a catalytic converter. The turbo wastegates are pneumatically controlled, maintaining boost at factory-specified levels. The crankcase ventilation, idle speed control, and EGR system (on some markets) complete the emissions package.
| Dimensions and Weight |
The external dimensions of the 1G-GTE engine are approximately 780 mm (30.7 inches) in length, 650 mm (25.6 inches) in width, and 710 mm (28.0 inches) in height. Dry weight is approximately 190 kg (419 lbs). This compact configuration was achieved by keeping the bore and stroke equal and employing a narrow bore spacing.
The aluminum head and twin small turbochargers allow installation in tight engine bays. The crankshaft is fully counterweighted and supported by seven main bearings. Connecting rods are forged steel, and pistons are cast aluminum with molybdenum-coated skirts and oil-cooling galleries. The flywheel bolts to the crankshaft flange with eight bolts torqued to 108 Nm (80 lb-ft).
| Maintenance Data |
Routine maintenance is crucial to ensure longevity. Spark plugs should be replaced every 20000 km (12500 miles). Valve clearance inspection is recommended every 40000 km (25000 miles). Timing belt replacement interval is 100000 km (62000 miles). Air filter element should be renewed every 20000 km (12500 miles) or sooner under dusty conditions. Fuel filter interval is about 40000 km (25000 miles).
Coolant replacement interval every two years. Engine oil and filter should be changed at 5000 to 10000 km (3000 to 6000 miles) depending on use. Turbocharger oil feed and return lines should be inspected periodically for leaks or restrictions. The throttle body and idle control valve require cleaning every 40000 km. Proper maintenance ensures the 1G-GTE can easily exceed 300000 km (186000 miles) without major overhaul.
| Tightening Torques |
Cylinder head bolts must be tightened in three stages: first to 39 Nm (29 lb-ft), then 90 degrees further, and finally another 90 degrees for full torque. Connecting rod bolts are tightened to 40 Nm (30 lb-ft) plus 90 degrees. Main bearing cap bolts to 83 Nm (61 lb-ft). Flywheel bolts 108 Nm (80 lb-ft). Camshaft bearing cap bolts 14 Nm (10 lb-ft). Spark plugs 18 Nm (13 lb-ft). Oil drain plug 40 Nm (30 lb-ft). Intake manifold bolts 25 Nm (18 lb-ft). Exhaust manifold bolts 34 Nm (25 lb-ft). Turbocharger mounting nuts 43 Nm (32 lb-ft). Crank pulley bolt 180 Nm (133 lb-ft). All fasteners should be tightened in sequence and to specification using a calibrated torque wrench.
| Vehicle Applications |
The Toyota 1G-GTE engine was fitted in several models primarily for the Japanese domestic market. It powered the Toyota Supra GA70 (1986–1992), Toyota Soarer GZ20 (1986–1991), Toyota Chaser and Cresta GX71 and GX81 (1986–1992), and Toyota Mark II GX71 and GX81. These vehicles benefited from the engine’s compactness, smoothness, and twin-turbo performance. Its twin parallel turbo system provided linear power delivery with minimal lag compared to single-turbo setups of the time.
The engine became a favorite among enthusiasts for tuning and swapping into lighter chassis due to its robust construction and strong aftermarket support. It established the foundation for Toyota’s later turbocharged inline-six engines, including the 1JZ-GTE and 2JZ-GTE, inheriting many of its design philosophies such as crossflow head design, turbocharging layout, and electronic management precision.
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