Is there a difference between tuning for acceleration performance and tuning for higway cruising?
Yes, tuning for acceleration performance is different than tuning for a “steady state” (maintaining a specific cruising speed) performance. Acceleration of a motor benefits from being slightly on the rich side as opposed to what is needed in the steady state. Of course, when running rich, you reduce your mileage capabilities. When jetting on a dyno, you need to stop going richer when significant gains are no longer being made. For example, on one of my bikes (an 80′ EVO producing 92 HP for the street), we stopped making significant horsepower gains with the main jet at 190. I richened it up to a 210, but only gained about two HP. This 2 HP gain didn t influence the over-all power band and wasn’t significant enough to justify the reduced mileage the 210 produced, so I went back to the 190.
