Dyno's are just a tuning tool, fact, however here in the uk I don't know what dyno's were used but I know of 2 cars that were tested and both those cars weight/mph@the track showed pretty much spot on dyno numbers. Whether this was just luck I'm not sure.

One of which was the car I crewed on last year. Dyno'd@695fwhp at EDF......weight@the line 3800lbs.+/- a few either way with the slicks, best mph last year was 130.14 on a perfect day with no headwind, plenty of 129+runs......thats 680hp, this is through the same carb/timing as dyno run but with all ancillaries and a full exhaust system with an air cleaner, basically as it drives on the street.

wallace has it with 680fwhp/3800lbs>

60 Foot E.T. : 1.44 Seconds
1/8 Mile E.T. : 6.52 Seconds
1/8 Mile Trap Speed : 104.22 MPH
1/4 Mile E.T. : 10.34 Seconds
1/4 Mile Trap Speed : 130 MPH
its gone a best of 10.35 with a best 60 of 1.431

so not saying dyno's are the be all they are certainly not, weight/mph is your dyno just sometimes at least here they showed pretty accurate numbers twice that I know of.