I think DA comes into play regardless of whether we are looking at 1/8 or 1/4. I have reviewed many of my timeslips and see 1/8 times dependent upon DA. It has a greater effect on the 1/4 but the 1/8 is definitely affected as well. I was a tenth quicker and 1 MPH faster in the 1/8 in 1650 DA vs 3000 DA. I was 2 tenths and 2 MPH faster in the 1/4.
what's the da tonight? sometimes the cool weather drops da at the expense of traction and you won't get much of the benefit of cool air in the 8th. traction is everything. however if you were on the 1/4 you could ease it off the line and let it eat that cool air all the way through the gears.
morale of the story:
get your ass to the 1/4 mile track! lol