Help me guess ET changes based upon this. Day 1 vs 2.

Temperature drops 40deg.
Humidity the same within 5%.
Baro press increases about .5
Dyno cf looks like N/A car power up 5.5%
Wind on the track changes from 10mph headwind to 4mph tailwind.

Or with 5.5% more power and 14mph better wind how much would ET's drop?

 

if you can still get the same hookup on launch w/40 degree lower temps, you could probly drop .2 i'd guess.... but you most likely wont get the same kind of tractino on a colder track, so ET wont get a lot better. However, your trap speed will increase substantially between makin more power and having the tail wind

 

Drops 40 degrees from what? 120 degrees to 80 degrees? 40 degrees to 0 degrees? I'm guessing you're talking about 80s into the 40s. If that's the case, then you're looking at at least .15-.20 and 1mph+.

No change obviously.

Possibly a drop of .1 and a gain of .5mph.

From what I've seen, headwinds don't really effect ET because so much of the ET is based on the 1st 1/8th of the track, but MPHs really do suffer. I've seen 10mph headwinds suck out over 2mph. I've also seen strong tailwinds add mph. When I ran my 14.45@99.51mph, I had a 10mph+ tailwind.

In the end, I wouldn't be surprised if you could drop .3 seconds and gain over 3mph in these improved conditions.