IMO there is no blanket answer for this question honestly. Depends on to many variables. Some cars hook hard and will show a fairly high spike in the G meter that will quickly fall off. Wheelies will affect it to some degree because it puts the logger at a sever angle momentarily. It is a great to compare runs but not sure there is a blanket answer. For instance with my throttle stop car it would hit 2G's then drop to nothing on the stop. It went bottom 8's or better off the stop and never saw more than 2.5. We have seen 3.2 in the NA 10.5 car, that was not one of our faster laps but one that stuck the tire hard and then pulled the engine down a bit.

I am sure Bob's car sees 3+ g's at 300' out as it freaking flies