Sky, excellent info. Actually it all make sense. In short, it's about rpm. If I want peak power at low rpm, go for smaller AR. And vice versa. Of course there are other consideartions, like cam degree n lift etc. But the single most important factor is, IMHO, rpm. I now hv a new equation, which is:
big ASS turbo + short ratio 6 speed seq = really good lap time!
