I have a spread sheet in excel that you can use with gear ratios to show their effect on MPH and a graph that shows a line, the more vertical the line, the faster the car will accelerate but the lower the top end, the more horizontal the line is, the less acceleration but the higher the top speed. I have a formula that gives 0-60 mph times that are going to be with in 10% of the true times, but this formula will NOT give you the perfect run, it will give u a run that is lower than the peak. I haven't intigrated it yet into the spread sheet but I'm close. anyone interested in having a copy?