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Originally Posted by Calum
The benefits of DI are well known and the idea of Toyota/Subaru designing a CC that's reportedly very good, but failing to smooth those edges to prevent hot spots is surprising.
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Consider their definition of good is mostly in regards to emissions. Performance wise the FA20 is way behind the times. 2.0l engines have been making way more power without DI, or variable cams for years even straight from the factory.
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Is there any application where you would say keeping the DI would be better on this car?
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At this point no but like I said we will continue developing the DI and with the MoTeC controlling it we can do some potentially interesting things with it so I may have to go back on this one.
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Is there any possibility of keeping the DI but smoothing the CC? Possibly adding material to the head and then machining the area to better fit the injector?
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This is definitely possible but at that point personally I would build the motor with some custom non DI pistons.
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Did you notice any significant change in milage without the DI?
I'm pretty sure I speak for everyone when I say I'd love to see pics of what you talking about.
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We didn't see any measurable difference in fuel economy. I've attached a picture (not mine I just circled what I'm talking about).
When you see all these new technologies keep in mind they aren't optimized for performance, they are optimized for; cost, emissions, and fuel economy, generally in that order.