The whole thing with the Gtech is you have to find a road where there arent trees right up to the pavement, (Middle of a Field is perfect) set it to your cars weight with driver and let it fly when it says GO. DO your best trying to launch as you would at the track and dont let off till the time blinks. Also if you boil the hides let off and start over....it EFFs things up sometimes. The main thing is doing it where theres nothing the radar can bounce off of. Thats what caused my 10.65 @ 91 MPH pass...