What is the fuel injection method of the Infiniti Q50L engine?

[SanAlexander]

The fuel injection method of the Infiniti Q50L engine is multi-point electronic fuel injection. Multi-point electronic fuel injection means that during the operation of the gasoline engine, the fuel injection process takes place in the intake manifold, controlled by a specific timing sequence issued by the control program and completed via electronic fuel injectors. The Infiniti Q50L is a luxury mid-size sedan under the Infiniti brand, offering two engine options: a 3.7L V6 engine and a 3.5L Hybrid powertrain, paired with a 7-speed automatic transmission. The Infiniti Q50L embodies Infiniti's newly upgraded "Breakthrough Aesthetics" design philosophy, showcasing a fusion of "power" and "elegance." It comes in seven distinctive body colors—Pearl White, Platinum Graphite, Malbec Black, Vibrant Red, Liquid Platinum, Graphite Shadow, and Sea Glass Blue—providing users with diverse and personalized purchasing options.

[ThomasFitz]

I have specialized in studying the Infiniti Q50L's engine system. This 2.0T model adopts direct fuel injection technology. Specifically, it injects fuel directly into the combustion chamber inside the cylinder through high-pressure fuel injectors, unlike older engines that spray fuel into the intake manifold. The benefits of this approach are particularly evident: injection pressure can exceed 200 bar, resulting in excellent gasoline atomization and more complete combustion. During actual driving, throttle response is exceptionally quick, with turbo lag being almost imperceptible. However, it's worth noting that this technology requires the use of 95-octane or higher gasoline, and the fuel injectors are prone to carbon buildup. It is recommended to use a fuel additive every 20,000 kilometers.

[McJoel]

As a Q50L owner for over three years, I've personally experienced the impressive performance of this engine's direct fuel injection system. During cold starts, the fuel injection system sprays extra fuel to ensure smooth ignition, while it precisely controls fuel delivery during highway driving. In city driving, fuel consumption averages around 10L, and even with aggressive driving it only reaches 13L, which is significantly more economical than my colleague's German car. The only drawback is that the maintenance technician warned me the direct injection system's fuel injectors are quite delicate, advising against refueling at small gas stations. Last year, I spent several hundred yuan on carbon deposit cleaning, but the acceleration became noticeably smoother afterwards.

[VanLawson]

Compared three fuel injection methods: traditional port fuel injection, hybrid injection, and the pure direct injection used in Q50L. The biggest advantage of direct injection is fuel efficiency and strong power, as fuel is directly pressurized into the cylinders, allowing a compression ratio above 10. However, the downside is that carbon deposits tend to accumulate behind the throttle valve over time, unlike port injection which can automatically wash it away with gasoline. If you frequently drive short distances, it's recommended to inspect the intake system every six months. Newer engines are now adopting hybrid injection, but Q50L's persistence with pure direct injection is justified, as Mercedes' M274 engine is indeed mature and reliable.