Originally Posted by flight

Torque is acceleration, Horsepower is speed.

Originally Posted by grumpy old biker

Ok! Show me your dyno chart. When your torque starts to drop away there is no reason to continue to rev the hell out of the bike. A HD down load or a PC rev extend etc., raising the rev limiter is not the point, and means nothing. If your torque is falling away, whether it be at 3, 4, 5000 rpm, any rpm rise after that is a waste of time and flogging your engine for little or no gain. Just because all your horsepower comes in at 6000 rpm, again means nothing. Torque is want gets you up to speed, horsepower is what maintains that speed. Building an engine for torque will guarantee you get horsepower, building an engine for horsepower doesn't guarantee torque. I'll take torque over horsepower any day of the week, that's the whole point of a Harley. Thought I would add - read my original post. I did not state that the bike would only make torque between 3000 and 4000 rpm, only that it would start to drop somewhere in that area depending on setup.

Originally Posted by 09StreetGlider

I believe all Harley HP and TQ curves cross at 5250 RPM correct? Regardless of the build IIRC. Why go higher than 5250?

Originally Posted by CURTYS06FLHX

So much mechanical loss from the cams to the valves on the v twin, if you want to go that fast buy a v rod