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Hi Capn..,
Those delta shaped things are VORTEX GENERATORS. A TURBULATOR is a thin layer of material with a zig-zag cut at the leading and trailing edge.
Vortex Generators help air flow around a sharp corner, but at the expense of some drag. The overall drag , properly design, is not that much different.
A turbulator introduces turbulence into the air flow. There purpose of turbulators is to prevent flow momentum causing the air to continue in its present direction, but to tumble and conform to to the shape of the airframe.
You have seen an application of the Vortex Generator, on the EVO to get the air to flow over the rear wing.
Turbulators are used on sail plane wings to prevent the air from going higher over the wing than the wing is, resulting in flow seperation.
On this site we have discovered that when you have a steep windshield angle, some small benefit can be had by putting a turbulator on the upper 1/3 of the A-pillar. Thus the air flowing diagonally across the windshield conforms to the flow down the side of the car, quicker. This is because with a steep windshield, some of the air in the outside corners is going sideways as it hits the upper 1/3 of the A-pillar. And it has momentum to shoot out sideways larger than the car actually is. By exhausting the energy asociated with this momentum, the air will combine nicely with the flow down the side of the car.
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