Overview & Design Features
The Lexus T24A-FTS engine represents a significant advancement in the manufacturer’s powertrain strategy, belonging to Toyota’s esteemed Dynamic Force engine family. Introduced to replace both the outgoing 2.0-liter turbocharged four-cylinder (8AR-FTS) and some naturally aspirated V6 units, this 2.4-liter (2393 cc) turbocharged inline-four powerplant is engineered for a blend of high thermal efficiency, responsive power delivery, and enhanced fuel economy. Its introduction marked a shift towards more compact, high-output forced-induction engines across the Lexus and Toyota lineups, emphasizing torque-rich performance suitable for a range of luxury and premium vehicles.
At its core, the T24A-FTS features an all-aluminum construction for both the cylinder block and cylinder head, optimizing weight and heat dissipation. A critical technological highlight is its D-4ST fuel injection system, which combines both direct fuel injection (DI) and port fuel injection (PFI). This dual-injection strategy helps mitigate common direct injection issues like intake valve carbon buildup while ensuring precise fuel delivery across all engine speeds. Variable valve timing is comprehensively managed by VVT-iE on the intake camshaft, providing electronic control for greater precision, and VVT-i on the exhaust camshaft, ensuring optimal valve overlap and scavenging. A single twin-scroll turbocharger with an electronically controlled wastegate maximizes boost response and efficiency across the rev range, further supported by an integrated exhaust manifold for quicker turbo spool-up.
This potent 2.4-liter turbocharged engine was first officially deployed in the Lexus NX 350, starting with the 2022 model year. Subsequently, it became a cornerstone powertrain for the fifth-generation Lexus RX 350 from the 2023 model year onwards. Its application also extends to other premium Toyota vehicles, including the Toyota Highlander and Grand Highlander in specific trims, further cementing its role as a versatile and high-performance option within the manufacturer’s portfolio.
Technical Specifications
| Specification | Value |
|---|---|
| Displacement | 2393 cc |
| Max Power | 275 hp (205 kW) @ 6000 RPM |
| Max Torque | 430 Nm (43.8 kg*m) @ 1700-3600 RPM |
| Fuel Type | Premium Unleaded (91+ RON recommended) |
| Fuel Consumption (combined) | ~8.5-9.5 l/100 km (varies by vehicle application) |
| Engine Type | Inline-4, DOHC, 16-valve, Turbocharged, D-4ST |
| Compression Ratio | 11.0:1 |
| Cylinder Bore | 87.5 mm |
| Piston Stroke | 99.5 mm |
| Valvetrain | DOHC, Chain Drive, VVT-iE (intake), VVT-i (exhaust) |
| Valves per Cylinder | 4 |
| Additional Info | Twin-scroll turbocharger, Air-to-air intercooler, Integrated exhaust manifold, Electronically controlled wastegate. |
Common Problems & Reliability
As a relatively recent introduction to the Lexus and Toyota lineup, long-term common problems for the T24A-FTS are still being fully observed. However, drawing from experience with other modern direct-injection, turbocharged engines, potential areas for attention include:
- Intake Valve Carbon Buildup: While the D-4ST dual-injection system (combining direct and port injection) significantly reduces the severity compared to pure direct-injection engines, some level of carbon accumulation on intake valves can still occur over very high mileage. Regular use of quality fuel and periodic fuel system cleaners can help mitigate this.
- Turbocharger Longevity: Turbocharged engines inherently place more stress on components. The single twin-scroll turbocharger is generally robust, but its longevity is directly linked to diligent oil maintenance and proper engine cool-down procedures after spirited driving. Early signs of wear could manifest as increased oil consumption or unusual noises.
- High-Pressure Fuel Pump (HPFP): The HPFP is a critical component for direct injection systems. While Toyota’s units are typically reliable, wear can eventually occur, potentially leading to fuel pressure issues. This is a common wear item across many modern direct-injection platforms.
Given Toyota/Lexus’s reputation for engineering robust and durable powertrains, the T24A-FTS is expected to have a strong service life. With adherence to the manufacturer’s recommended maintenance schedule and using specified fluids, an expected service life exceeding 250,000 kilometers (155,000 miles) before requiring a major overhaul is realistic.
Maintenance Tips & Service Schedule
Optimizing the longevity and performance of the T24A-FTS engine relies heavily on strict adherence to a comprehensive maintenance schedule:
- Engine Oil & Filter: Regular oil changes are paramount for turbocharged engines. Replacement is recommended every 8,000 to 10,000 kilometers (5,000-6,000 miles) or every 6 months, whichever comes first. Use only full synthetic engine oil with a viscosity of 0W-20 or 5W-30, meeting API SN Plus or SP, or ILSAC GF-6 standards, as specified in the owner’s manual.
- Spark Plugs: Spark plugs should typically be replaced every 96,000 kilometers (60,000 miles). Using iridium-tipped plugs, as specified by the manufacturer, is crucial for optimal ignition and longevity.
- Air Filter: The engine air filter should be inspected at every oil change and replaced every 30,000 to 45,000 kilometers (18,000-28,000 miles) or more frequently in dusty environments.
- Coolant Flush: The engine’s coolant should be flushed and refilled with the manufacturer’s specified long-life coolant every 160,000 kilometers (100,000 miles) or 10 years, whichever comes first.
- Timing Chain: The T24A-FTS utilizes a timing chain system, which is designed to last the life of the engine under normal operating conditions and proper maintenance, typically not requiring scheduled replacement. Inspection at very high mileages (e.g., over 200,000 km) may be prudent.
- Fuel System Cleaning: Periodically, using a high-quality fuel system cleaner can help maintain the cleanliness of injectors and mitigate carbon buildup, particularly beneficial for direct-injection engines.
Conclusion
The Lexus T24A-FTS engine stands as a testament to modern automotive engineering, offering a compelling blend of power, efficiency, and refinement. Its advanced design, incorporating dual fuel injection and sophisticated variable valve timing, positions it as a highly capable and responsive powerplant. For a used vehicle buyer, this engine generally represents a safe and reliable choice, provided the vehicle has a documented history of consistent and proper maintenance. Its inherent design and Toyota/Lexus’s established reputation for durability suggest that the T24A-FTS, when cared for diligently, will deliver many years of dependable performance.