How many valves does the FA20 have?
four valves
If the Toyota 4AG is a firecracker, the Subaru/Toyota FA20 is a stick of dynamite. Featuring direct injection, high compression, four valves per cylinder, and variable valve timing for both intake and exhaust events, the FA20 showcases today’s latest engine technologies.
How reliable is the FA20DIT?
The FA20DIT is easy to tune and mod, but that can start to push the rods towards their safe upper limits. That said, the FA20’s are solid engines overall that provide a solid balance of reliability, performance, and efficiency. Maintain them well and you’ll likely have a good experience for many years to come.
How much hp can FA20DIT handle?
The OEM FA20DIT fuel system is capable of around 450 hp before port injection should be considered.
Does FA20 have variable valve timing?
The FA20 allows for large changes in cam timing via Variable Valve Timing (VVT) adjustments. Unlike many other VVT cam gears that lock at the max- retard position, the FA20 locks closer to a middle position (30 degrees retard and 40 degrees advance from the crank angle) when the engine is turned off.
What is the difference between EJ255 and EJ25?
The only difference between them was the turbo and intercooler set-up, and the tuning of the ECU. Starting with the 2006 – 2007 WRX and Forester XT, this was the first point where the EJ255 actually started to receive different parts from the STI.
What are the advantages of the FA over the ej25x?
From detailed write ups floating around the internet, it seems the FA and EJ engines share many similar characteristics with the big exceptions being DI and the twin scroll turbo (and it’s location being at the bottom). So the advantages over the EJ25x is usable boost on the street, and better fuel economy off the get go.
Is the FA20 more reliable than the EJ?
Additionally, the FA20 appears to be more reliable. The latter EJ engines started having issues across the board with ringlands, spun bearings, etc. Funny thing is, the FA has thinner bearings.
Does the FA20DIT have cam phasing?
The FA20DIT has cam phasing on both the intake and exhaust cams, but the phasers themselves are much closer to what’s found on the BRZ engine than on an older EJ. [font=Verdana]First, here is a description showing the conventional AVCS phaser on an EJ255 when it is advancing the cam:
Why does the FA20DIT use cooled high pressure EGR?
The FA20DIT uses cooled high pressure EGR for improvement of fuel economy. We call it high pressure EGR because it relies on the high pressure before the catalyst (or turbo in this case) to drive EGR to the intake manifold, which is after the high pressure side of the compressor. High pressure cooled EGR is typically used at higher unboosted loads.