does burning on 80min instead of 74 make a difference
 

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it makes no different burn 74min game on a 80min cds i use for all games 80min cd....

In simpler words... hell no!!

Thanks for the simplification, it was really needed.

If you need an 80 minute disc (700 meg) because the data won't fit on a 74 minute disc (650 meg), yes it will make a difference. You'll actually be able to burn the data successfully.

If the data is small enough to fit a 74 minute disc, then a 74 minute disc is all you need, and as such the 80 minute disc won't do any better.