I made a few runs at US 41 with my G-tech meter and the time slips looked almost like twins compared to the G-tech. That being said, I have 285/35/19 Pilot PS2's on my car and in 60 degree weather (not at a track) launching with the TC on I've pulled off a 12.3 on the G-tech, but you could feel the TC kicking in. I've tried launching with the TC off, but I got a lot of spinning & fishtailing and about half the time it caused the G-tech to fault out. With the Hoosier DR's at the US 41 track I pulled off 3 or 4 1.7 60's and the rest of the 26 or so runs were mostly 1.8's with a few 1.9's.