It's probably easier to get track numbers. Atco for instance is open 3 nights a week for TNT. No need to adjust tire pressure if you can drive. You can break a lot on a dyno as well. Less likely sure, but it happens. Forget launching, slip th clutch a little and launch. That will get you an ideal trap and you will know where you stand. Not to mention dynos have a lot of variables as do tracks, bu trap speeds ar 9/10 times more consistent between different tracks. More consistent than dynos I mean. Cheaper too. $70 vs $20.
" I'm sure that Z06 is carrying at least 500lbs in passanger weight, which would put it around 4800 pounds. But can this make that much difference? 5mph in the 1/4 mile is a lot!!! The only other explanation is the M5 being tuned. The Z06 could shift a little faster though. "