Who are we doing this for; "the others" or for the joy of the drive?
Of course a Roots or TVS would be better for response and system "purity" if you will, but that area of the aftermarket just isn't caught up yet. With a turbo setup where you're trying to stretch the bandwidth, you'll rarely have an ideal scenario where you're operating at peak efficiency of every facet of the system at all times, it just can't happen unless you're driving a Toyota HSD or similar. Until the mainstream catches up the concept of "Greenformance", we'll just have to focus on fitting engines like the FA20 to our own needs. Nevertheless, BMW & MINI make it happen with good success in their latest crop of T-GDI engines. They have broad power bands and good response with respectable [but not amazing] BMEP. Like I said, you can't have it all, you can only try to optimize the system the best way we know how. If MINI can get an OEM BMEP of 318 with a broad RPM band [it's higher in practice, but that's with the advertised torque], why can't we as a collective aftermarket? That equates to 257 LbFt at the crank with the FA20. Spread that amount of torque as far across the board as possible and you have a recipe for a super flexible and satisfying powertrain.
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arghx7 pointed out Subaru's next-gen engine and IMO it would be a great fit for a BRZ STI. Personally, I'd prefer an FR-S TRD using a Roots blower setup, but that's just my driving-pleasure preference and isn't solely based in logic.
Quote:
Originally Posted by arghx7
Basically, OP is looking for Subaru to offer the new turbo 2.0 liter engine in this car
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300HP and 295LbFt would be killer. IMO the car doesn't need
that much, but that's the torque shelf that would zap the car awake in a big way.