gp,
While rear gears have great effect on how fast and quick the car is, it doesn't change during the run or while driving, so it can be considered a constant and can be excluded from the calculation.
What does change during the run are the rpm and the transmission gears.
The code calculates the rpm drop based on engine speed and the change in trans gear.
The second part compares where the revs dropped to and what the entered low end of the power band is.
If the box is green, you are still in the power band.
Once you become familiar with using it you can do a couple of helpful things with it.
It can help determine optimum (or at least better) transmission gears for your specific application and it can also help you tailor your shift rpm.
When I first used it, I picked just over a 10th in the quarter by shifting 150 rpm sooner out of first and 200 rpm sooner out of second.
I was running out of motor on top and shifting sooner dropped my after shift revs deeper into the power band.
That let me get further down the track before making second and I still had a little motor left at the end of the track.
I also found out that by shifting that little bit earlier, I was coming out closer to peak torque.
It really made a difference.
With respect to your 3.43s, I think you have to balance running out of motor in first with how quickly you can get the car moving fast enough to create enough forward inertia for the car retain as much velocity as possible on the shift to second..
The mechanical advantage of your first gear ratio is a lot higher than second.
The faster the car is going before the shift, the easier for the taller second gear to accelerate further/faster.
What kind of speed do you want in the 1/4?