how many times do i have to say this: if anybody has that much of a hard on for lap times, just borrow mine, or any of the dozen or so people that have one pitted next to you. that said, xt lap timers are only so accurate. if you want truly accurate lap times that wont suffer from interference from say, someone running an XT right in front of you, you need to do a race with a AMB transponder system or as was mentioned before, a GPS system with a high frequency gps transmitter (no, the one in your phone isn't particularly a high frequency unit). more important than that, lap times mean jack shit other than milestones. its your smooth riding/braking/accelerating, whether you're riding off track, crashing, hold your lines, making safe passes, blah blah blah. all those things are more valuable indicators of your riding than lap times.