Originally posted by NYKnicksSVT:
This may seem like a really stupid question, but if you pin the secondaries open, why would that be different from them opening at 3400rpm? Wouldn't you have the same effect at high rpms?
Check out the dyno's on a stock Duratec. The engine runs out of breath right around 3100 when it's just breathing through the primary runners/valves, causing a dip in power until the secondaries open up. Ideally you'd want the secondaries to open up a few hundred rpms sooner than stock.....
