I always advise to make logs before and after any changes.
We can get information about boost pressure (boost specified vs actual boost), IQ (injection quantity) (IQ requested vs Actual IQ), ..., and with this information know where you can improve.
You can download this pdf that showing all you need to make logs with vagcom.
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When you save the vagcom log file you can see in excel, but is more dificult to interpret, so you can download this software that show your logs simplest way to understand.
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