i swapped to a 7lb fly near the end of last season and profited. just went by the basic theory that the less resistance there is, the less inertia is needed in the fly to overcome that resistance. all i can really say is that it shaved more time off my road track ET than it lost on the quarter mile time in the first post of this thread.
seems to me that a higher weight (to a limit) is the obvious solution when ripping it in a straight line. i mean, if all you're doing is upshifting at peak rpm then odds are the engine speeds are never going to drop so low that the slowing of the fly between shifts will create additional work for the engine to recover the fly's inertia so full power can again be moved to the wheels. i'm guessing a vacuum gauge could help roughly find the limit at which the weight is too much, but i could be wrong so i'm going to stop talking now before i embarass myself further
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