Factors that affect test numbers includes air temperature, barometric pressure, condition of track
surface, tune of test car.
Due to the different origins of the data, tests may not have been performed with the same
Significant difference: 0-60 mph, 0.3 sec. - 1/4 mile, 0.5 sec.
Typically as reported by the manufacturer.
Significant difference: 5 mph
Usually initiated when the pedal is touched, and just enough
effort is used to avoid wheel locking; on cars equipped with anti-lock braking systems, the ABS is
fully invoked. Significant difference: 60-0 mph, 10 ft.; 80-0 mph, 15 ft.
Handling is qualified two ways
Skidpad measures steady-speed cornering grip around a 200-ft. diameter circle (run both
Slalom run through eight cones spaced at 100-ft. intervals, samples both controllability and grip
during transient handling.
Significant difference: Skidpad, 0.02g; slalom, 1.0 mph.
Prices are estimated and might change per country or year.
Most of the definitions are from Road&Track magazine
Different factors can affect a car performance, such as: Air humidity, air temperature, barometric
pressure, condition of track surface, tune of car. Therefore, you might have different performance data
for the same car.
A good example is the Porsche 997 Carrera S (June 2007):
Road&Track 0 to 60 mph is 3.9 seconds.
Motor Trend 0 to 60 mph is 4.4 seconds.
Porsche 0 to 60 mph is 4.6 seconds.
Not all cars have this huge difference of 0.7 seconds. According to Road&Track, 0.3 seconds difference
is common for a 0 to 60 mph.
Here is Road&Track's explanation for the 997 Carrera S:
"At the test track, the Carrera S posted some awesome acceleration numbers: zero to 60 mph in
3.9 sec. and 12.3 to the quarter (we got a 4.4 and 12.8, respectively, in a previous test). These numbers
were so extraordinary that we took the car to MD Automotive in Westminster, California, to measure the
Carrera S's output on the dynamometer. No steroid controversy here, the car came away clean. The only
explanation for the difference in acceleration times is that this particular engine had a proper break-in
period (it had 5400 miles on the odometer as opposed to the 1200 miles on our previous test car)."
As you can see, creating a ranking for car performance is difficult with these kind of differences.
Although, when we have enough data for a car, we are trying to use our best judgment to have an accurate