Sample rate is a variable in the Holley system. You can sample up to 100 times a second but the data files get really big. I usually set the system up to sample at 20 times a second. That works pretty well for drag racing. When I set up a drag car I have the data logger turn on once the throttle position is greater than 80% and then it turns off after 20 seconds. That usually captures the burnout and the pass. Autocrossing would probably require a different trigger and perhaps a different data rate and length.