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Originally Posted by nikitopo
The new 2.4lt engine is very weak on peak numbers. Even with a turbo it outputs 260-horsepower. An NA version would not be too far from the current output. If not 205hp, maybe 210hp?
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Obviously it's tuned for a very different application. It would be easy enough for Subaru to at least make the same hp/liter with a 2.4 NA tuned for the BRZ, so 246 N.A. horsepower right there.
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You would really need a square setup to go higher and this engine is not like this. It has a 94-millimeter bore and an 86-millimeter stroke and it was designed for torque, not horsepower.
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Whut? More oversquare is generally "revvier" and has more potential for higher-rpm power vs. square or undersquare. Same stroke as FA20 so really no more potential revs based on piston speeds/accelerations, but now there's a lot more potential valve area for better breathing without having to resort to greater valve lift or duration.
As you suggest, at the *very* least it would give a good boost to torque everywhere even if they kept the same heads and valves which would limit gains in high-rpm power.