Using your methodolgy my Speed Triple RS comes out to .343 hp/lb based on the last dyno measurement at the rear wheel. Based on factory spec numbers that changes to .411hp/lb. That's not a true value either since you must include rider weight as well to be accurate. Curb weight of the Z1 Camaro is listed as 3,907 lbs, so again your numbers are a bit off. Suffice to say that until you get into true exotic automobiles, bikes have an edge.