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Use the create unit trigger to place EVERY unit you don't want effected by the speed change.
Player 14 will still affect units after it. Also a player 13 map revealer will crash the game.
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I thought the P13 or P14 units had to be in the top left corner of the map.
I'm tired of saying this, so I'll just say your a retard... Explain why it needs to be in the top left corner, if there is no logical explanation, then you can place it anywhere. I place mine in the lower left corner. :l
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Then follow the 2x / 4x speed tutorial.
As I said, player 14 will affect all units, player 13 only affects preplaced units.