What Pi software are you using? Is it Pi Toolbox or Club Expert Windows? If Toolbox, you need to write a maths channel that compares time. Load two laps, (fastest lap and another slower lap) and compare using the fastest lap as the datum. You can then add in the other channels to see why the driver was slower and where it occured. If it is CEW, its pretty straight forward to do it. If it's the very old Pi V6, (not to be confused with Toolbox version 6.0) you may struggle.
Let me know what software you are using and I will post instructions with some screen shots if poss.
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