Remember every tenth you save off the line will gain you 2 in the 1/4
With turbo cars esp the quicker you get off the line the quicker you get into boost.
I dropped a considerable amount off my 1/4 mile times by going 5lbs heavier on my flywheel. Almost a full second actually.
There are a lot of variables here but the "correct" weight flywheel for your car can make a huge difference in 1/4 mile times.
My 60fts with a 11..lb flywheel were in the 1.9-2.2 sec range dumping the clutch off the rev limiter, 17lb flywheel 1.5-1.7 60 foots, Times dropped from 12.8's-13.20's to 12.20's-12.30's