When using VorTech pumps, the best way to create a gyre is to use at least two or perhaps four pumps, depending on your aquarium size. When viewed from above, the pumps would be setup as shown in the attached image, below.
Next use Long Pulse mode and set the duration of the pulse to as long as possible. A good trick is that you can set the low speed achieved during long-pulse mode by entering in your feed mode speed to "barely spinning" through the Configuration Mode on your EcoSmart driver (refer to the Complete Instruction Manual, page 28 for instructions:
http://ecotechmarine.com/wp-content/...evision1.2.pdf).
The advantage to setting the low speed to "barely spinning" is that the "off" pump won't overpower the opposite pump when the flow direction changes.
A great example of how fantastic Gyres are and how well VorTech pumps can create them is our office's 350gal tank. This tank measures 6' long, 3' deep and 30" tall. The entire aquarium has two MP60 pumps on it, but only one is ever running at one time using Long Pulse mode and with the two pumps setup as above. That's some SERIOUS circulation for very little power consumption.