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Sorry ill take it down a level. Datalogging is a way for you to read and record the information that the computer that runs your engine is seeing. Being able to see that information lets you tune your car in a safer manner than using gauges alone. Currently datalogging can be done on 91-93 and 96+ cars.
obd2 is the "language" that all 96+ cars in the USA were required by law to speak. before that the cars computer could speak whatever "language" the maker wanted it to. The problem with obd2 is that there are different "accents"(trying to keep with the language theme) and just because something can read one car that is obd2 doesnt mean that it can read another cars obd2.(GM vs Mitsu for example)
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