You could get a lap timer like Harry's with a 5hz receiver and get lots of data but I agree there is limited value in it for AX. Get in the right seat with the fast guys and watch how they do it. Get an instructor in your car and focus on one section at a time. Seat time is 100X more valuable than data. I like to use the fastest guy in my class as a yardstick for possible performance. On big tracks, I use the lap record in class as my yardstick. 
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
Last edited by Topless; 06-05-2012 at 06:49 AM.
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