How much will adding 16 lb to my car affect ET/mph(rotating weight)

Beleave it or not the slicks and the street tires are on alu rims.

The street tires are on a set of turbine or fined rims that came on a old ford like a thunder bird. had to grind the center out so that they would fit on my axles.

If i had the money i would go by some nice light weight rims and some real sticky d.o.t tires........So have to make do with what i have kicking around.

Sounds like cast alum rims , they are heavy !~