The GTech doesn't measure what in drag racing is called roll out.
It's basically the first 4-8inches of movement depending on diameter of
your front tire and the deepness of your staging.
GTech claims this roll out is generally less than a tenth. So, a GTech
will measure your 1/4 mile times about a tenth slower than your track
times. On the 5 runs I made at the track with a GTech I averaged .08
seconds slower with the GTech. Bernd said his avg was .03 slower. I can't
imagine the error ever exceeding about two tenths even in the slowest 31"
tired vehicle.
Weight is not an issue here for determining only time and speed. HP
estimates require a weight. I have never been to the scales, so I have
never entered a weight. I haven't made any changes since I've had the unit
so I had no reason to "make up" a number for before/after comparisons.
-Steve Ekstrand
This archive was generated by hypermail 2b29 : Fri Jun 20 2003 - 11:58:01 EDT