Timeslip calculations...

Well, I'm too cheap right now to buy a weather station and e.t. predictor. So does anyone do the math on their timeslip at the track? What formulas are you using to figure horsepower, torque, split times, etc. Anything to help me understand what the car is doing and figure out stuff. I think the calculation for m.o.v. is: your e.t. x fastest m.p.h. x 1.146= does that sound right? Thanks for the help.