Quote:
Originally Posted by mrspindlelegs
Is there a problem with the rods in the FA20DIT? I don't keep up with the happenings on that engine other than some of the brief comments made at FT86club. I did do a search of Subaru Parts Online comparing the part number for the rod in the FA20 vs. the FA20DIT and they were different so the rods should be different. However, different numbers doesn't necessarily mean stronger. Your thoughts / experiences?
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It's what seems to be the first failure point when you ramp boost too fast, or in general is just the first failure point I'd say 85% of the time. It's a decent motor and one that loves to make power, but there's always going to be a first component to go, and it just so happens that it's usually the rods in both the 86 and WRX FA20.
My opinion is that it makes a lot of sense to do pistons and bearings while you're in there. On the EJ25 motors it was pretty easy to just do pistons and hold 400whp, as the pistons were the weak point, and it takes a decent amount of mods to hit that power level. Due to the improvements in the forced induction design and the FA motor in general, it doesn't take much to get within 50whp, (350) which is about where these rods get less happy. The more conservative you tune, the more likely you are to be able to hold the higher power levels, but at the cost of the car being fun to drive across the power band.
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