Subaru FB16DIT 1.6L Engine Specs, Problems, Reliability, Info

Subaru FB16DIT/FB16F Overview

In 2014, Subaru developed a turbocharged version with direct fuel injection of its 1.6-liter four-cylinder FB16 boxer engine. This engine was manufactured in Japan and was used only in the first generation of the Subaru Levorg (2014-2020) JDM model. Although the FB16 DIT turbo engine is derived from the naturally aspirated FB16B engine, the only common part between the two is the crankshaft. So, let's take a look at what Subaru engineers have eventually created.

FB16DIT 1.6L Turbo Design

In the middle of the FB16F, or FB16DIT engine, there is an open-deck aluminum cylinder block with cast-iron sleeves. These sleeves are poured into the block during the production process. The block comes with stronger connecting rods and forged pistons. New aluminum DOHC cylinder heads feature optimized ports, larger valves, and new camshafts specifically designed for this engine. Camshafts are chain driven (there are two timing chain: left and right) and they equipped with phase adjusters of the variable valve timing system AVCS. Head covers are aluminum.

The FB16DIT is equipped with direct fuel injection system. The high-pressure fuel pump is powered by the intake camshaft of the left cylinder head. It sends fuel through a high-pressure fuel line to special injectors, which then inject the fuel directly into combustion chambers. The letter “T” in the name means “turbocharged”. This engine has a twin-scroll turbocharger Garrett MGT1549S. All pipes and the intake manifold are made from plastic. Even the air-to-air intercooler on top of the engine is partially made from plastic. To reduce harmful emissions, this engine is equipped with Tumble Generator Valves (TGV) and an Exhaust Gas Recirculation (EGR) system, as well as a catalytic converter. Despite the fact that this is a turbocharged engine with a relatively high compression ratio of 11.0:1, it runs on regular gasoline (RON 91).

The Final Result

The performance level of the FB16DIT engine is very close to that of a larger 2.5-liter naturally aspirated engine FB25. This 1.6-liter turbo boxer develops 170 hp at 4,800–5,600 RPM and 184 lb-ft (250 Nm) at 1,800–4,800 RPM. Additionally, it has a good fuel efficiency of 38 MPG (16.0 km/L), according to the JC08 cycle.

The FB16DIT engine was discontinued in 2020 and replaced by the newest turbocharged Subaru engine called the CB18.

Engine Specs

FB16DIT Problems and Reliability

Everyone knows that Subaru's boxer engines can be quite troublesome, and turbocharged versions often require even more attention.

• Carbon build up. This problem is typical for direct fuel injection engines. For preventive purposes, it is not superfluous to clean the intake and intake valves from carbon deposits every 50,000-60,000 miles.
• Despite the fact that the manufacturer allows the use of regular gasoline, it is better to pour premium. It will extend the life of the direct injectors and HP fuel pump.
• Poor motor oil kills the AVCS phase shifters very quickly. Change it every 5,000 miles and use only the recommended oil by Subaru.
• Sometimes, oil can leak from the dipstick. It is a common issue.

FB16 DIT Longevity

How long will it last? It depends on how you use and maintain it, as well as other factors. But on average, FB16DIT engines last for 150,000 miles (250,000 km). A more frequent oil change and the use of premium fuel can help extend the lifespan of the engine. Also, keep an eye on the cooling system's condition. Cooling is a crucial point for thermally loaded engines.