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I agree with much of what has been written above. The data collection systems are similar but with what may be important differences (sample rates, ease of connecting additional sensors), but the two key items in my view are:
1) what are the people you want to compare data with using?
2) how does the software meet your needs?
Traqmate probably has the easiest to use software, but it is more limited in analysis capabilities than the RacePak or Race Technology (DL-1) packages. With the DL-1 (the one I have and am most familiar with) you can easily define "math channels" to compute, display, and map items such as "grip-limited cornering speed" or "rate of throttle application" or other variables that can help you determine what is going on. However, the additional capability comes with the cost of additional complexity and resultant steeper learning curve (or simply more difficult to use, depending on how you view it!).
In the end, I think one of the most useful features of data acquisition is providing the ability to compare your driving with that of someone else in a quantitative manner, and for that reason the system all your track buddies have is probably the most important consideration.
TrackVision (mentioned above and used to merge data with video) works with all of these systems.
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Mike
'87 911
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