Timeslip calculations...

I had a written formula for the weather, temp, humidity, baro, and corrected altitude as to how it changed my cars performance. Also for how long it was between runs, and I could predict my ET within .007 as long as all other things were equal, the worst variable for that though was traction, (leaf spring, caltrac car) but you have to keep meticulous records of your runs and use only all out runs to figure your averages. I could at one time even figure what the ET would have been if I didn't lift or brake at the stripe but I ran it out to at least the 1000 ft mark. It's going to be a little different for each car so you need to figure your own, buy a weather station and use only that one as they vary considerably.