Originally Posted by Kestrel
I'm not saying i-VTEC doesn't help, I'm saying that the dominant factor is displacement, not intake timing. Also, the engines I'm pointing to with large gains over stock intakes are all 2.5 L or above. I'd also say that a K20 without i-VTEC would probably still have more gains than an F20 because it runs at higher RPM's, so it demands more air and has more benefits from an intake.
well why wont a bored over b20 gain hp like a k20. the rev range are basically the same, they both have vtec but only one has a variable intake cam. a gs-r will not gain 20 hp from i/h/e, yet a k20 will, why?