The below has just about everything you need to know about the engine in the all-new NX200t:
Share your thoughts, questions, concerns, etc, about it in the comments section below.
Share your thoughts, questions, concerns, etc, about it in the comments section below.
NX 200t: New Turbocharged Engine
For its first-ever turbocharged gasoline engine, Lexus created an all-new engine architecture. The 2.0-liter turbocharged port and direct-injection engine uses an advanced valve control system to switch between Atkinson cycle and Otto cycle operation to optimize performance and fuel efficiency. To minimize turbo lag, the four-into-two exhaust manifold system pairs cylinders according to their expansion or compression stroke to reduce pumping losses and eliminate exhaust gas interference. This results in improved acceleration response and wide torque band. The turbo engine produces 235 hp at 5,600 rpm with 258 lb.-ft. of torque from 1,650-4,000 rpm and up to 17psi of boost at wide open throttle. A balance shaft enhances smoothness.
The combination of direct fuel injection and additional port fuel injectors, as used on some other Lexus models, ensures ample power and crisp responsiveness at all engine speeds.
Combining the cylinder head, exhaust manifold and intercooler with variable wastegate control enhances low speed torque fuel economy. Active wastegate control minimizes pumping losses by reducing backpressure during low engine load. The water-cooled intercooler, mounted directly to the engine, provides strong advantages in acceleration. A dual exhaust system reduces backpressure and noise.
The D-4S fuel injection system provides the optimum mixture to realize the highly efficient rapid combustion.
To keep the engine oil clean, the intake system creates a syphon which draws carbon vapors away from the crankcase allowing for 10,000 miles between oil changes similar to aspirated engines. Dual Variable Valve Timing with intelligence (VVT-iW) optimizes torque throughout the engine speed range and allows the engine to start in the Otto cycle and then run in the more fuel efficient Atkinson cycle. The late intake valve closing of the Atkinson cycle reduces pumping losses and boosts fuel economy.
The turbo engine was bench-tested for more than 10,000 hours before extensive on-road testing, covering more than 600,000 miles, began.
