[mreid]

Great article on vacuum advance, but several misinformed posts with blanket statements like "running mechanical secondaries on the street is wrong". Just demonstrates a lack of complete understanding. Power to weight ratio is a bigger determinant than street vs. strip. Also, some street cars also run on the track and need mechanical secondaries. Properly tuned mechanical secondaries on a high power to weight ratio vehicle will always perform better than vacuum secondaries through the range of driving conditions. Add vacuum advance and you have a killer combination.