Calculate 1/4

On the 1/4 mile you would have run (assuming everything is working) mid 13's (13.3-13.6 depending on who's online calculator you trust). For my car (this varies from car to car) I multiply my 1/8 mile ET by 1.575 to get 1/4 mile ET. Again, this varies slightly from car to car, but for mine it works with in a few hundredths every time. I calculated this using data from about 20 1/4 mile runs with my car.