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Toyota 4GR-FSE Specifications
| Engine Model: Toyota 4GR-FSE |
| Engine Type: 4-cycle 6-cylinder 24-valve DOHC VVT-i liquid-cooled gasoline |
| Total Displacement: 152.5 cu.in (2.49 L) |
| Rated Engine Power: 204-215 Hp (152-158 kW) at 6400 rpm |
| Fuel System Type: Toyota D-4 direct injection |
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| General Technical Data |
The Toyota 4GR-FSE is a 2.5-liter, naturally aspirated V6 gasoline engine belonging to Toyota’s GR engine family. Introduced in 2003, it represents one of Toyota’s early adoptions of direct fuel injection technology for six-cylinder engines. Developed as part of Toyota’s modular GR lineup, which includes the 2GR and 3GR series, the 4GR-FSE was designed for longitudinal installation in rear-wheel-drive and all-wheel-drive vehicles such as the Lexus IS250, GS250, and Toyota Mark X.
The engine features aluminum construction, DOHC
configuration, four valves per cylinder, and Dual VVT-i (Variable Valve
Timing – intelligent) on both intake and exhaust camshafts in later
variants. With direct fuel injection and precise electronic management,
the 4GR-FSE combines smooth performance, fuel efficiency, and low
emissions while maintaining the refinement characteristic of Toyota’s
luxury powertrains.
The 4GR-FSE replaced older straight-six engines such as the 1JZ-FSE,
offering similar displacement but improved compactness and weight
distribution due to its 60-degree V6 architecture. The engine’s design
prioritizes smoothness, balance, and responsiveness, achieved through
lightweight components, an advanced combustion chamber design, and
optimized intake and exhaust flow. Its combination of power and economy
made it a popular choice in luxury sedans and sports-oriented vehicles,
where refinement and durability were essential.
The Toyota 4GR-FSE has a total displacement of 2,499 cc (152.5 cubic
inches) derived from a bore of 83.0 mm (3.27 inches) and a stroke of
77.0 mm (3.03 inches). The compression ratio is relatively high at
12.0:1, made possible by its advanced D-4 direct injection system, which
cools the combustion chamber by injecting fuel directly into the
cylinder.
This allows for efficient combustion and
reduced knock tendency. The engine operates on the Otto cycle and uses a
60-degree aluminum-alloy block with cast-in cylinder liners for wear
resistance. Each bank of cylinders contains an aluminum DOHC head with
four valves per cylinder, totaling twenty-four valves. The firing order
is 1-2-3-4-5-6, and the crankshaft runs on four main bearings.
Counterweights and a well-balanced crank design ensure smooth operation
with minimal vibration.
The engine produces between 152 and 158 kW (204 to 215 horsepower, or
201 to 212 bhp) at 6,400 revolutions per minute, and maximum torque
ranges from 260 to 260 Nm (192 lb-ft) at 3,800 to 4,800 rpm, depending
on model year and ECU calibration. The redline is approximately 6,800
rpm, and idle speed is electronically controlled at 650 ± 50 rpm. The
engine management system continuously adjusts ignition timing, air-fuel
ratio, and valve timing to achieve optimal efficiency and emissions
performance.
The cylinder block is a lightweight die-cast aluminum structure with a
60-degree bank angle. It employs a deep skirt design for rigidity, with
each cylinder bank offset to reduce the width of the crankshaft journal
overlap. The crankshaft is forged steel, supported by four main
bearings, and internally balanced. Connecting rods are forged steel with
fracture-split caps, and pistons are lightweight aluminum alloy with
molybdenum-coated skirts to minimize friction. Oil jets located in the
block cool the underside of the pistons, preventing detonation and
improving durability under sustained load. The crankshaft’s torsional
vibrations are controlled by a tuned rubber-damped pulley.
The cylinder heads are made of high-strength aluminum alloy and use
pent-roof combustion chambers with a centrally located spark plug and
side-mounted fuel injector. Intake and exhaust ports are optimized for
smooth flow and high volumetric efficiency. The camshafts are hollow and
lightweight, driven by a primary roller chain with hydraulic tensioners
and guides. Each camshaft operates via bucket-type tappets, and valve
clearance adjustment is shim-type. In later versions, Dual VVT-i
provides continuously variable cam timing on both intake and exhaust
sides, improving torque delivery and reducing emissions.
| Fuel System |
The 4GR-FSE uses Toyota’s D-4 direct injection system, which supplies
fuel directly into each cylinder at extremely high pressure. The fuel is
first pumped from the tank by an electric in-tank pump to a
camshaft-driven high-pressure fuel pump, which boosts pressure up to
approximately 12 Mpa (1,740 psi). The high-pressure fuel is distributed
through a common rail to six solenoid-type injectors, which atomize the
fuel into the combustion chambers. The injectors are multi-hole types
optimized for a wide spray pattern to promote complete combustion. The
electronic control unit (ECU) continuously monitors engine load, speed,
throttle position, and exhaust oxygen content to adjust injection timing
and duration for both stratified and homogeneous combustion modes.
Under light-load conditions, stratified charge combustion is used,
injecting a small rich fuel pocket near the spark plug while the
remaining air in the chamber remains lean. Under high load or
acceleration, homogeneous stoichiometric combustion ensures maximum
power and smooth response. The throttle body is electronically actuated
(ETCS-i) for precise air intake control, and a fuel pressure sensor
continuously feeds back data to the ECU for closed-loop regulation. Fuel
pressure and injection are synchronized with ignition events to optimize
efficiency and emissions.
| Lubrication System |
The engine employs a fully pressurized lubrication system using a trochoid-type oil pump driven by the crankshaft. Oil is drawn from the aluminum sump through a strainer, then forced through the oil filter and distributed to the crankshaft, connecting rods, camshafts, and valve train. A full-flow spin-on oil filter with bypass and anti-drainback valves ensures constant flow even under cold-start conditions. Piston cooling oil jets spray the undersides of the pistons for additional cooling.
Normal operating oil pressure is around 400 kPa (58 psi) at 3,000 rpm
and approximately 100 kPa (15 psi) at idle. The total oil capacity with
filter replacement is 6.1 liters (6.4 US quarts, 5.4 Imperial quarts).
Recommended oil viscosity is SAE 5W-30 or 0W-20 meeting API SN or higher
standards. Oil changes are recommended every 10,000 km (6,000 miles)
under normal use or every 5,000 km (3,000 miles) under severe
conditions.
A positive crankcase ventilation (PCV) system routes blow-by gases from
the crankcase into the intake manifold to reduce emissions. Later
engines also incorporate oil-separator chambers in the cylinder head
covers to reduce oil consumption and maintain cleaner intake passages.
| Cooling System |
The cooling system is a sealed, pressurized, forced-circulation type using a belt-driven centrifugal water pump. The coolant circulates through the block, heads, radiator, and heater core. The thermostat begins to open at approximately 82 C (180°F) and is fully open by 95°C (203°F). An aluminum cross-flow radiator with an electric cooling fan maintains optimal engine temperature. The system capacity is approximately 8.0 liters (8.5 US quarts, 7.0 Imperial quarts).
The pressure cap maintains system pressure at around 108 kPa (15.6 psi). Coolant composition is a 50/50 mixture of ethylene glycol-based antifreeze and deionized water, providing corrosion protection and freeze resistance down to –35°C (–31°F). A coolant temperature sensor feeds data to the ECU, which controls fan operation and injection timing accordingly.
| Intake and Exhaust Systems |
The 4GR-FSE uses an intake system designed for smooth airflow and noise
reduction. The intake manifold is aluminum, incorporating
variable-length intake runners to enhance torque across the rpm range.
The throttle body is electronically controlled, allowing fine adjustment
of air intake for smooth acceleration. A dry paper air filter element
housed in a sealed airbox removes particulates from intake air and
should be replaced every 20,000 km (12,000 miles).
The exhaust system includes stainless-steel manifolds feeding
close-coupled catalytic converters to achieve quick light-off after cold
starts. Dual oxygen sensors monitor emissions and provide feedback to
the ECU. Later versions incorporate a secondary air injection system for
faster catalyst activation. The muffler system is tuned for quietness
and low backpressure, consistent with luxury sedan applications.
| Ignition and Electrical System |
The 4GR-FSE employs a coil-on-plug ignition system, with each cylinder having an independent ignition coil controlled by the ECU. Spark plugs are iridium-tipped, long-reach type with a gap of 1.1 mm (0.043 inch). The ignition timing is continuously variable, synchronized with both camshaft positions and knock sensor feedback. Typical spark plug service interval is 100,000 km (62,000 miles). The alternator output is rated between 100 and 120 amperes, and the starter motor is a 1.6-kilowatt reduction-gear unit. The system operates on 12 volts DC with negative grounding.
| Valve Timing and Drive Mechanism |
The timing drive system uses a primary roller chain linking the crankshaft to the intake camshafts, with secondary chains driving the exhaust camshafts. Automatic hydraulic tensioners and chain guides maintain correct tension and minimize noise.
Dual VVT-i on later variants continuously adjusts intake and exhaust cam phasing using oil-pressure-actuated phasers controlled by the ECU. This system improves torque at low rpm, increases power at high rpm, and reduces fuel consumption and emissions. Chain life is designed to exceed 250,000 km (155,000 miles) with proper oil maintenance.
| Other Systems |
The engine includes several auxiliary systems to support emissions control and operation. The positive crankcase ventilation (PCV) system minimizes blow-by emissions. The evaporative emission control (EVAP) system captures fuel vapors and redirects them into the intake. The exhaust gas recirculation (EGR) system reduces NOx formation by recirculating a portion of exhaust gases.
The ECU manages all systems under OBD-II diagnostic protocols, storing fault codes accessible via standard diagnostic tools. Knock sensors on both banks detect pre-ignition, allowing the ECU to adjust timing instantly.
| Dimensions and Weight |
Overall engine dimensions are approximately 690 mm (27.2 inches) in length, 710 mm (28.0 inches) in width, and 705 mm (27.8 inches) in height. The dry weight is about 172 kg (379 lbs). The compact V6 design allows for improved front-to-rear weight distribution in longitudinal layouts. The engine mounts use liquid-filled cushions to isolate vibration and enhance comfort.
| Maintenance Data |
Regular service is essential for longevity. Engine oil and filter
changes are performed every 10,000 km (6,000 miles). The air filter
should be replaced every 20,000 km (12,000 miles), and spark plugs every
100,000 km (62,000 miles). The coolant is replaced every 160,000 km
(100,000 miles) or 5 years. Drive belts are inspected every 40,000 km
(25,000 miles) and replaced as necessary. Valve clearance should be
checked at 100,000 km (62,000 miles), though adjustment is rarely
required due to stable shim-over-bucket design. Fuel injectors should be
inspected and cleaned every 80,000 km (50,000 miles).
Standard compression pressure is 1,400 kPa (203 psi) at 300 rpm, with a
minimum allowable limit of 1,000 kPa (145 psi). Compression difference
between cylinders should not exceed 100 kPa (15 psi). Idle speed is
maintained at 650 ± 50 rpm by ECU control. Oil pressure at idle is
around 100 kPa (15 psi).
| Tightening Torques |
Cylinder head bolts: 40 Nm (30 lb-ft) plus 90 degrees, then an
additional 90 degrees.
Main bearing cap bolts: 63 Nm (47 lb-ft).
Connecting rod bolts: 45 Nm (33 lb-ft) plus 90 degrees.
Camshaft bearing cap bolts: 10 Nm (7 lb-ft).
Crankshaft pulley bolt: 180 Nm (133 lb-ft).
Flywheel bolts: 85 Nm (63 lb-ft).
Spark plugs: 25 Nm (18 lb-ft).
Oil drain plug: 40 Nm (30 lb-ft).
Intake manifold bolts: 25 Nm (18 lb-ft).
Exhaust manifold nuts: 35 Nm (26 lb-ft).
Valve cover bolts: 9 Nm (7 lb-ft).
Engine mount bolts: 60 Nm (44 lb-ft).
| Vehicle Applications |
The Toyota 4GR-FSE engine has been installed in a variety of vehicles
across Toyota and Lexus lineups.
Key applications include:
– Lexus IS250 (GSE20, GSE25; 2005–2013)
– Lexus GS250 (GRL11; 2012–2017)
– Toyota Mark X (GRX120, GRX130; 2004–2019)
– Toyota Crown Royal and Athlete (GRS180, GRS200; 2003–2012)
– Toyota Reiz (Chinese-market variant of Mark X; 2004–2017)
The early versions (2003–2006) featured single VVT-i on intake camshafts
and a more conservative ECU map emphasizing smoothness and economy.
Later Dual VVT-i versions (post-2006) introduced variable timing on both
camshafts, improved throttle response, increased power output, and
enhanced emissions performance compliant with Euro 4 and later
regulations. Both versions share core architecture, with differences
mainly in ECU tuning, camshaft phasers, and catalyst design.
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