Your right the c15-60 will only make 220 max whp. I did a ZX14 and it was not enough to warrent the cost. The C15 costs the same as the C30, crazy but true. The C38 costs only £100 more.
You're right, comparing the maps. And to be honest it surprised me a bit. In practice, I know a Triumph Rocket 2.3 with intercooler can put out more than 300 Whp with the C15-60. Although it's a much bigger engine, it run allmost half the rpm . So it seems to be more efficient.
you've got it wrong the Rocket kit uses a C30-94. But its static compression is only 8.7:1 so it doesn't use the boost to the max effect. But it does well to double the horsepower for double the air (it runs 14 psi boost).
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