Join Date: May 2004
Location: Toronto, Canada
Have a look at Ivan's Performance (one of the site sponsors). He made a thread about several incremental improvements to achieve about 170 hp and around 82 - 83 lb.ft of torque (but without changing camshafts or pistons).
I have a suspicion that it will be hard to do much more than that without major compromises in other areas and/or without spending HUGE money on it. The stock pistons are already short-skirt, quite light, rather high compression ratio. (Do you really want to be *stuck* with running race fuel only?) The stock cams already have rather long duration (have a look at the cam timing specifications in the shop manual).
The amount of torque that a normally-aspirated gasoline engine can produce is limited by the amount of air and fuel that it can breathe in. The 82 - 83 lb.ft per litre of displacement which Ivan got is at the outer boundaries of what's normally seen. MotoGP bikes are in this same range - they make their power by making that torque at higher revs, and that requires a lot more internal surgery in order to stay together at those higher revs. Even Formula 1 cars are only slightly higher than this.
If what you are starting with is pretty good, usually wild camshafts only move the torque peak to higher revs (but compromise low-end and mid-range). Is that what you really want ... ? ? ?
I'm not bashing the idea, I'm only trying to make sure you're aware of the issues and costs, and you know what you are getting into ...
Helibars, MRA screen, Ohlins damper, reversed shift pattern, sorted suspension, braided lines, Michelin Pilot Power, all else stock 'coz it's fast enough!