Contest time! Guess the ET and MPH to win!
Temps, DA and water grains dropped quite a bit. With my car, water grains makes a big difference in how it runs.
Other than that, I have no explanation. The car always goes quicker later into the afternoon and night.
DA is only moderately related to temperature.
I have slowed down at night when it’s 70 out, compared to when it was 85 out in the middle of the day, just because of humidity and or dew point coming in.
Actually your DA didn’t drop much. Going from 2200 + DA to 1700 plus is only a very few numbers. That is actually a very stable race day.
I raced between 1500 and 2300 feet my first weekend out. Both days were actually completely different. Warm and clear. Dreary, cloudy and humid.
Car was between 6.56-6.60.
This weekend just finished I just got back from racing in Ohio. The heat was stifling. Car ran 6.66-6.68, but that was at 3600-4000 foot DA all weekend.
So basically probably a tenth and a half quarter mile but my DA went up 2500 feet, not 500 feet. I had a 10.48 1/4 mile hit, about 1.5 tenths off from good , not mineshaft air( under 1000 foot)
Think that is probably pretty typical. I don’t lean the car out for heat, or fatten it up( usually) for cool weather.