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Kirk,
Don't underestimate the GTech as a useful tool for evaluating performance. Like a dyno or GPS datalogger, a windshield mounted accelerometer can yield very good results once you have a good baseline. insite did a comparison between the $200 GTech and a $2000 Traqmate GPS and the results were nearly identical. It looks simple and doesn't cost much but it does give very good real world (rubber on the road) performance data when set up and used correctly.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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