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      06-21-2012, 01:28 PM   #59
rhouck
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Drives: 2008 E92 M3
Join Date: Sep 2011
Location: Los Angeles, CA

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Quote:
Originally Posted by klammer View Post
I've been using this not as video but just a lap timer. It's kept in my center armrest while on track and seems this makes it rather inaccurate. As I compare my videos against the timing it's off, sometimes by as much as 2-3 seconds or even more. Is it's accuracy affected that much by its placement in the car? Only used it a handful of times, but seems off. Even have same exact lap times but am off on avg. speed in those by sometimes as much as 9 mph. Will grabbing the cradle, gps helper, improve things that much?
Mine was within a tenth of a second 95+% of the time (compared to official timing) when stashed in my glovebox. Therefore clear line of sight to GPS satellites is not required. This is with an iPhone 4s.

However, I take anything outside of the lap times with a grain of salt (e.g., mid-corner speed, etc.).
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2009 Honda S2000 -- 1:59.726 Buttonwillow 13CW (N/A, OEM Aero, RS3); 1:55.792 Buttonwillow 13CW (S/C, aero, RS3)
2008 BMW e92 M3, 6MT, MR/FR, NT-03+M 18x10, JIC Coilovers
2007 Yamaha R6
M-drive retrofit! http://www.m3post.com/forums/showthread.php?t=676825