ZR1Vette ran a 14.7 @ 96 or something like that back when his car was bone stock.
Long since gone...but yeah...he clocked off a few low 15's passes spinning of course.
Lower tire pressure, remove headlight, take all the junk out of the trunk/car...1/4 tank of gas or less...running 93~ as long as you're knock free now...toss a gallon of race gas in there if you got some knock.