Good info for the new to sport. I've been using Wallace for years on my old cars and its quite accurate for the average d/slammer, your method 1320 div x mph, not having tried it before, shows a deficiency of approx 1.5>2 tenths on my cars to the actual mph run.
Where it falls down as well as all the other calcs and here there is something else to understand is where you get a car that 60fts like a stocker where 60's can be as much as a 1/10th quicker than the average fair chassis, the lack of mph that generates will show a slower ET to the calcs, example>
We have 2 A/SA stockers here that run times in the mid>high 9.70's@131>132 max, with 60's in the high 1.2's with the back wheels, that mph only shows up as 10.1>10.0.
