What is the fastest NASCAR speed ever?

Answer 1

Bill Elliott, 212 miles per hour at the Talladega qualifying in 1986.

Rusty Wallace also tested at Talladega for NASCAR in 2004 in an unrestricted car (no restrictor plate) and achieved a top speed of 228 MPH, and a one-lap average of 221 MPH.

Answer 2

If you go by qualifying speeds alone and not the race average,

Texas Motor Speedway is the fastest track since 200, followed very closely by Atlanta.