Quote:
Originally Posted by Levi
At the moment we can't really say what can be improved on the NA Flat4 because we have no data. If it is the EJ20, then I am going to get the 2,2l stroker kit.
However it can be possible to come closer to 300 PS staying NA. The BMW 320si WTCC has a 275 PS 2.0l I4 with redline at 8.500 RPM. Here other two Crosworth engines.
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In reference to your and supporting Dimmans post.
1. The engine will not be a EJ20 (Period)
2. If your trying to get 150bhp/L Naturally Aspirated then you're effectively trying to create a race engine regardless of engine size. (Porsche GT3 RS 4.0 is 125hp/L at 500hp)
3. Trying to street a 300bhp 2.0L Naturally Aspirated engine on pump gas is nearly insane. I mean look at the F20C: it's USDM spec was 237hp @ 8300rpm and 153lb-ft at 7500rpm (and that engine breaths very well). Theoretically along the same lines you would like 160lb-ft at 8700rpm as peak torque for what you're proposing.
4. It's simpler and way cheaper to go the forced induction route via aftermarket or engine swap for 300bhp (even with the fabrication, wiring harness and ECM niggles). Something along the lines of EJ turbo from a WRX STI, or whatever Subaru is cooking up as the replacement.