"Ever wondered why the 0-60 mph time from publication A is lower than the one from publication B? It's generally not because one has better drivers than the other, especially in today's world of launch control and automatic transmissions. Nor is it due to equipment accuracy, as everyone uses Racelogic VBOX data loggers. The time difference is usually due to the liberal use of a correction factor and the needless application of rollout.
Rollout comes from the drag strip. When you start a quarter-mile run, the timing lights don't start until the front wheel is all the way over the starting line. That number used to be approximated by subtracting the first foot of an acceleration run. Now a common substitute is to cut the first 3 mph from a run, cutting as much as 0.3 seconds off the time. Some publications post a 0-60 mph with rollout and others do not. Once again, there is no standard. In either case, it means the number in print isn't the number you feel.
Weather corrections need to be applied because engines make different power in different weather conditions. Temperature, altitude, and humidity all make a difference. While most publications claim to use an SAE standard to correct for weather variations during testing, the application of the correction changes from publication to publication. In order for a number to be comparable, it needs to be corrected. But weather corrections normalize for perfect testing conditions where an engine will be at an optimal operating condition. In the real world, a vehicle will almost never be driven in perfect weather, meaning it will never actually make the power the tests correct for."
"Aside from weather correction and rollout, there are plenty of other factors that can change a 0-60 time. Non-standard tires, fuel, and weight can all affect performance testing. Some vehicles with sophisticated launch control systems that are set up for a perfect 0-60 run are actually slower in a rolling 5-60 mph test. Often times, test drivers will use and abuse a vehicle in a way no real owner ever would."
Edited by Plus 3 Golfer, 23 July 2018 - 02:49 PM.