Quote:
Originally Posted by thatguitarguy
Increasing FE by 3mpg from 40 to 43mpg is worthwhile, but going from 9 to 12mpg is a 33% increase, and that's HUGE.  |
it's a trial and error thing; generally, for performance, you would tune the transition to secondary opening so that it couldn't be felt, you wanted it to be smooth. the 'pull' that some would feel means that they are opening too soon, hence a 'bog'.
conversely, you can have them open later. in my Dad's case, it seemed that even at part throttle cruising, the secondaries were partially open.
a vacuum gauge really helps when doing this.